Thermocycling as a means of inducing mechanical fatigue in dental composites

(1)

Southeast

Asian

Division

12th

Annual Meeting

September

9 -

12,

1997

Phuket,

Thailand

Participants

and

Sequence

Numbers

of

Abstracts

Abayaratna, S.,

0-35

Durward, C.S.,

P-39c

Jitsurong, S., P-33c

Abdul-Kadir,

R., 0-6, P-35c

Elizarova, V., P-49

Juntavee, A., 0-46

Abu

Kasim, N.H., 0-19

Erliani, S., 0-43

Juntavee, N.,

0-22, 0-46, P-26

Addy,

M., P-11

Eto, K., P-29

Adulyanon, S.,

0-36

Kaewkrasaesin,

S., P-48

Akeanankul,

A.,

P-8

Fricton,

J.R., 0-4

Kanchana, P., P-18

Alimova,

N., P-49

Fumayama, K., P-9

Kedjarune, U., P-33c

Amomphimoltham, P.,

P-32c

Fung,

D.S.H., 0-41

Keng, S.B., 0-50

Annussom-Nitisara,

S., P-8

Kerdvongbundit,

V., 0-16

Aoki,

K.,

0-27

Godfrey, K., P-17, P-18

Khanh, N.D., P-39c

Aryatawong,

K.,

P-36c

Gonzalez,

M.A.G., 0-47

Kiatpongsan,

S.,

0-48

Asano, M., P-9

Goto, S., 0-23

Kiertiburanakul,

K., 0-33

Auerkari,

E.I., P-4

Guay,

M.,

P-46

Kimbrough, R., P-6

Awang,

H.,

0-44

Gunaratnam,

M., 0-10,0-11

Kitcharoensakkul,

K.,

P-26

Gwinnett,

A.J.,

0-20

Kittikhun,

0., P-26

Benjavongkulchai,

E., P-46

Komin, 0., P-23

Beress, A., P-6

Ha, N.,

P-31c

Koo, S.P., 0-28

Bhuridej,

P., P-54

Hang,

C.S.,

0-29

Koompirojn,

K., P-48

Botelho, M.G.,

0-17

Hegawati,

S.,

0-43

Koontongkaew, S.,

0-13,

P-30c,

P-32c

Bradley,

P.F.,

0-26

Ho,

V.,

P-16

Kowawisarat, P.,

P-10

Buajeeb,

W.,

P-i5

Hoan,

V

.,

P-416

Kuesakul,

P.,

0-3

Buranarugsa,

M.,

P-18

Hoerup, N.,

P-50,1

P-52

Kukiattrakoon,

B., P-33c

Hongprasong, N., 0-9

Kuphasuk,

Y.,

P-55

Caruso, J.M.,

P-6

Hood, J.A.,

P-24,

P-39c

Kusolwisitkul, W.,

P-34c

Chailertvanitkul,

P., P-42c

Hosanguan, C.,

0-33

Chandrasekera, M., 0-40

Hsu, C.W.,

P-44c,

P-45c

Chandrasekera,

M.S.,

0-37

Hsu, M.L.,

P-38c

Ladpli, A., 0-4

Chang, C.S.,

P-37c

Huang,

H.M.,

P-40c

Laksminingsih,

R.,

0-43

Chen, C.M.,

P-44c

Hughes, F.J.,

0-26

Lam, W.T.C., P-21

Chen, S.Y.,

P-25

Hung, H.,

P-31c

Lan, H., P-31c

Cheng, C.M.,

P-37c

Lee,

C.K., 0-51

Chew, C.L., 0-45

Ibrahim, W.M.A., 0-21

Lee,

K.C., 0-6

Chiang, H.C.,

P-40c

Idjradinata, P., 0-39

Lee,

S.Y.,

P-40c

Chidchuangchai,

W.,

P-55

Iijima,

H.,

P-9

Leggat, P.A., P-33c

Chindavanig, V.,

0-49

Inoue, T.,

P-23

Lekruengsin, B., 0-49

Chittaisong,

C.,

0-42

Iseki, S.,

P-29Li,CC

04

Cholitgul,

W.,

P-5

Ishikawa, A., P-20

Lim,

LCP.,

0-10,

0-11

Chou, S.L., 0-5

Itthagarun, A., P-47

Limkool, P.,

0-24

Chowanadisai, S.,

P-33c

L

T

Chu, C.H.,

0-34

Jaafar, N.,

0-2

Lin,

ZC..,

P-42c

Chungpanich, S.,

P-36c

Jaffar,

J.,

P-16

Lin,

Z.C.,0-29

Jainkittivong, A.,

0-15

Linsuwanont,

B.,

P-9

De Melo, L., P-9

JangTumrat, P., P-26

Liu, C.M.,

0-Dheeravarangkura, P.,

P-s

Jayawardena, A.,

P-9

Lo, E.C.M.,

0-34, P-43c

Djais,

A., P-4

Jeerapaet, N.,

P-.22

Low, K.S.,

0-Si

Doreyat, J., 0-2

Jeiroudi, M.T., P-6

Luksirilert, A., 0-46

(2)

Mackenzie,

D., P-42c

Puapansawat, P., P-46

Taiyeb, A.T.B., P-3

Mahanonda,

R., P-2

Putthasri, W., 0-31

Takagi, Y., P-9

Manosudprasit,

M.,

P-18

Tam,

T., P-31c

McCabe,

J.F.,

0-19

Quan, D., P-31c

Tan,

K.B.,

0-50,

P-16

Md-Dom, T.N., 0-6

Tanakun, S., P-7, P-55

Meka-Apiruk,

T., P-48

Rapisuwan,

S.,

P-54

Tani,

Y.,

P-20

Metzger,

Z.,

0-14

Rattanajaroentarm,

S.,

P-26

Taniguchi, H., P-23

Mitrakul, K.,

P-8

RazakA.,

0-1,

P-3

Tawompituk, Y.,

P-17

Miyagawa, Y.,

0-23

Razak, I.A., 0-1, P-3

Tay, F.B.K.,

0-10, 0-11

Mohd-Dom,

T.N.,

0-1,

P-35c

Rittapai,

A.,

P22

Tay, F.R., 0-20

Moonsarapee,

S., 0-9

Rungvechvuttivittaya, S., 0-27

Teanpaisan, R., P-12

Moran, J., P-11

Techakumpuch,

P., P-8

Morriss-Kay,

G.M.,

P-29

Sae-Lim, V.,

0P44

Teerawatnapong,

S.,

P-2

Mullikanawin,

S., 0-49

Saito, M., P9

Thaweboon,

B., P-15

Musa,

S.,

0-44

Sakoolnamarka, S., P-1

Thaweboon, S.,

P-15,

P-55

Muthalib,

A., P-4

Salcedo, A.H., 0-44

Theerajetkool, S., P-54

Myadav,

0-28

Salimee, P., P-8

Thitinanthapan,

W.,

P-13

Samaranayake,

L.P., 0-12,

P-14

Thomrongananskul, N., P-27

Nakagaki,

H., P-31c

Sangkheaw, S., P-34c

Thongpussa, K., P-28

Nakai, A., 0-23

Sarinnaphakom,

L., 0-30

Tiyapravat, V., 0-22

Nambiar, P., 0-51

Satamanont, P., P-13

Toh, C.G., 0-18

Nanayakkara, D.,

0-40

Satang, J., 0-46

Trope, M., 0-14

Neo,

J.,

0-45

Satrasook,

C.,

0-3

Tsai, C.Y.,

P-38c

Ngerywijit,

T.,

P-17

Sattarujawongse,

V., 0-48

Tuntiprawon, M., P-53

Nguyen,

P.D.T.,

P-41c

Schinkers, W.L.,

P-62

Nivitchanyong, S.,

P-19

Schwarz,

E. 0-32,

0-41

P-43c

Vachirarojpisan, T.,

P-10

Noor,

M.,

0-18

.,

'

cVan

Rossom, H.J.M., W-1

Sermsuti-Anuwat,

N.,

P-53

Vanichanon,

P.,

0-3

Obsuwan, K., 0-42

Sheiham, A., 0-36

Vibulsavatdiwat,

K., 0-22

Oeswen,

R..,

0-39

Shiau, Y.Y., P-44c,

P-45c

Vongsavan,

N.,

P-13

Oewen, R.R.,

0-39

Silarujisun, P., 0-9

V

Ogura, H.,

0-23

Sinsawat, A.,

P-46

Ohya, K., 0-27

Siswomihardjo,

W., 0-25

Wagner,

J.L., 0-4

Ohyama,

T., P-23

Smales,

R.J., P-21

Wan

Hussain, N.M.Z.,

0-1

Oki, M.,

P-23

Snambiar, 0-28

Wantanasiri,

M.,

P-10

Okiji, T., 0-27

Songpaisan, Y., 0-31,

P-1

Watanapa,

A.,

P-52

Ong, A.H.M.,

0-38

Srisintom,

S.,

P-12

Wefel, J.S.,

P-47

Ongsakul,

M., 0-13

Srisuk, N., P-17

Wei,

S.H.Y.,

0-20,

P-47

Ono,

Y.,

P-9

Su,

C.Y., 0-29, P-37c, P-38c

Winsootthisin, S., P-1

Suchatlampong, C., P-19,

P-22

Wiwatwarrapan, C., P-24

Peng,

CC.,

P-45c

Suda,

H., 0-27

Wong, M.C.M., 0-32, P-43c

Petersen,

P.E.,

P-50, P-51,

P-52

Suebnukam,

S.,

P-30c

Wong, T.I., 0-38

Phankosol, P., P-23, P-27,

P-28

Sujak,

S.L.,

P-35c

Wongsrimongkol, T., P-6

Phantumvanit, P.,

0-31,

P-46

Sujirarat, D.,

P-1

Wu, C.Z.,

0-5

Pitiphat, W.,

0-31

Sukswang, S.,

P-48

Wu, T., P-14

Pittayawutvinit, P., 0-22

Sumij, T., 0-24

Poomviset,

N.,

P-51

Sunarto,

H.,

P-4

Yap,

A.U.J.,

P-16

Prachaney, S.,

P-2

Suputtamongkol,

K.,

P-22

Yap,

R.,

P-16

Prakobjit, S., 0-22

Surarit, R.,

P-22

Yapong,

B.,

0-13, P-30c,

P-33c

Premsirinirund, T.,

0-15

Suttapreyasri, S.,

P-36c

Yeo, J.F.,

0-8

Prijatmoko, D.,

0-43

Suzuki,

R.,

P-23

Yip,

H.K.,

P-21

Promasa,

B.,

0-33

Swaminathan,

D.,

P-11

Youngnoi, T.,

P-34c

Promieng,

N.,

P-53

Swartz,

M.L.,

0-47

(3)

J

Dent Res 77

(5)

1998

Divisional Abstracts:

Souttheast

Asian

Division

1349

Key

Words

Acrylics, P-24, P-25

Finite

analysis,

P-40c

Periodontal

organisms,

0-13, P-2, P-4

Alloys,

0-22,

0-23,0-51,

P-19

Fluoride, 0-42,0-46, P-21,

P-31c,

P-35c,

Periodontics, 0-9, 0-12, P-3, P-4

Amalgams,

0-31,0-47,0-48, P-19

P-46,

P-48

Physical, 0-7

Anti-microbial

agents/inhibitors, P-12

Fluorosis, P-35c

Physiology,

P-44c

Anthropology,

0-40,

0-49

Fungi, P-14

Plaque,

0-12,0-16

Antiseptics, 0-17, P-12

Policy, 0-36

Antimicrobials,

P-12,

P-55

Gerontology,

0-35,

P-34c

Polymers, 0-25, P-22, P-27

Anxiety,

0-41,

P-54

Glass

ionomers, 0-17,

0-18,

0-31,

0-45,

Porcelain

systems, P-26

0-46,

P-21

Preventive

dentistry,

0-35, 0-42, 0-44,

Bacterial,

0-11

Gingivitis,

0-16

P-31c, P-39c, P-43c, P-49,

P-50, P-51,

Behavioral

science, 0-41, P-10

Growth and

development,

0-39,0-40,

P-55

Biomechanics,

P-18,

P-22,

P-23

P-19, P-29

Prophylaxis,

P-11

Bleach,

P-13

Prostheses, P-23, P-24, P-25, P-27, P-28

Bone,

0-29

Hardness,

0-18

Prosthodontics, 0-30, 0-49, 0-50, 0-51,

Bone repair, P-37c

Health services research, 0-32, 0-33,

P-8,

P-23, P-24, P-25, P-27, P-28, P-41c

0-34,0-36,

P-34c,

P-50, P-51,

P-52

Proteins, P-32c

Caries,

0-1, 0-5, 0-31,

0-43,

P-43c,

Histology-ulstrastructure,

P-36c

Psychology, 0-38, P-7, P-35c, P-54

P-47

P-49

Human, 0-S

Pulp,

0-27,

P-13

'

~~~~~~~~~~~~~~~~~~~Pulpal

disease,

0-14

Caries

organisms,

P-55,

P-48

Cariogenicity,

P-10

Immune

response,

0-27, P-2,

P-15

Castings,

0-24,

P-53

Immunology,

0-13

Quality,

0-2,0-32,0-33,0-34

Cell

biology, 0-29,

P-29

Implantology,

P-37c

Cell

culture, 0-10

Infection, 0-28, P-33c

Cements, 0-48,

P-53

Inflammatory

mediators, 0-26

Race, 0-38

Ceramics, 0-22, P-26

Interfaces, 0-26, 0-51, P-1i

Radiology,

P-S

Cephalometric analysis,

P-6

Resorption, 0-14

Collagen,

P-38c

Joint

dysfunction,

P-38c, P-41c

Root canal fillings, P-42c

Composites,

0-19,0-45,0-46,

P-20, P-40c

Computers,

P-16

Malocclusion,

P-9

Saliva,

0-12, P-14,

P-32c

Consumers,

0-32,0-33,0-34,

P-54

Management,

0-6

Sealants, P-39c

Corrosion,

P-19

Mastication,

P-8, P-45c

Sex, 0-38

Metals, 0-23, 0-24

Stain,

P-11

Dental materials,

0-17,0-18, 0-19,

Microbiology, 0-10,

0-11,

P-33c

Steroids, 0-14

0-20, 0-21,

0-22,

0-24, 0-25, 0-45,

Microleakage, 0-47, P-42c,

P-53

Stress, 0-21

0-47, P-20, P-22, P-26, P-28,

P-40c

Mouthrinses, P-32c,

P-48

Surfaces, P-21

Dentifrices,

P-46, P-47

Mucosal

diseases,

P-7

Dentin,

0-20

Teeth,

0-7

Dentin

bonding

agents, 0-20,

0-21

Neutrophils,

P-15

Therapeutics,

0-4

Diagnosis, 0-5, P-16,

P-17

TMJ and

masticatory muscles, 0-3,

0-4,

Diet,

0-15,

0-37,0-42,0-43,

P-10, P-11

Occlusion,

0-30, 0-49, P-8, P-41c, P-45c

0-5,

P-16, P-44c, P-45c

Oral

hygiene, 0-43,0-44,

P-3

Tobacco, 0-9, 0-10,

P-1

Ecology,

P-33c

Oral medicine, 0-28,0-37,0-44,

P-5,

P-7

Tongue, P-36c

Elasticity,

P-18

Oral surgery, 0-7

Trauma fracture, 0-6

Enamel,

P-31c,

P-39c,

P-46, P-47

Orthodontics, P-6, P-9, P-18, P-44c

Endodontic

organisms, P-30c

Osteoblasts, 0-29, P-29

Endodontics, 0-27,0-48, P-13, P-30c, P42c

Ultrasound/sonics,

0-50

Enzymes,

P-14

Pain,

0-1, 0-2, 0-3, 0-4, 0-26

Utilization/demand, P-34c, P-52

Epidemiology,

0-1, 0-2,0-3,0-8,0-35,

Palate, 0-50,

P-36c

0-37, 0-40, 0-41, P-1, P-49,

P-50,

Pathology,

0-8, P-5

Viruses,

0-28

P-51,

P-52

Pedodontics,

0-16,

0-39

Erosion,

o-1i

Periodontal

disease,

0-9, 0-13, 0-15,

(4)

AbutmetTooth Vitality and Longevity of FixedPartialDentures. P-O.J. Emergingdiseasesand oralhealthcare.

S-i

GLANTZ(Oral

Health Scienc Centre,Malmno, Sweden).

S-2

CSCULLY*(Eastman DentalInstitute for Oral Health CareSciences,

Univeraity

ofLondon, UK)

The human hasaremarkablearrayof defences

against

microorganisms.

Similarly, The useof root filled teethasabutnmets forfixedpartialdentures(FPD)isalong accepted aicroorganisms canberemarkablyadept at colouringsuitablenichesevading practiceman 5uccessfiJcomtponsentof msodern

prosthodontica.

Litttl knowledge has, howeve, host defencesandoutwitting attemptsattheir destruction, notleastbythe

bee available aboutthe relatveprognosticvalueof rootfilledabutment teehascomparedto appearance of antimicrobial resistance, neWstrainsorevenneworganisms. vitalones.Aseries ofmirveysand climical xpeimentswastherefore peformedtocomparethe Iamunedefects, populationshiftsand changinglifestyle andenvironment

relaionhipbetwen butenttoothvitalityandthelongevityof

'FPDa.

Theamsre was contribute to theemergence ofnewdiseases, sevenlof whichcanaffect oral

perfrmedduriga

earperiod

on agroupof316paientsseetedatrandomfirom the files healthorhealth care, and have implicationsforall specialties.

ofteSwdishDentlImarace Sytm All studied paiswere treated with FPDa(mean

exeson-f units)bygnrlpractitioners1

prior

toseeto.The result show that frattsre Infection with human imeunodeficiency viruses tHIV) is makingamajorimpectand Ofdista abutmen teeth onyocrdinrootfilled such teeth man that the

fre.quency

of alltype oral infections withnewviral and fungalorganismsand

otheir

agents are

Of techncal failure (ind.losof FPD-retetion andFPD-fracure)waslaghe forpuatets appearing, with newclinical diseases,disorders hithertofoundonlyinspecific

withrootfille dista abutmnat teeth andvaryingwith the somber oflPD-cantileveroextenion geographical areas, and withimplications fororal healthcare. ponitics.Thbomecaia qualityofrootfilled and vita abutment teethwasstudied inaseie

of clinicalbendingeprmnsonthre health subject.The result of this

study

showroot Dental healthcareworkersnowneed to extend their education intoasuchwider filled teethto have a ioeancl(painand/ordiscomfort)threshold level thatis morethan field ofheaithcare.

twiceashighasthat ofneighbouringorcontrWalaeal vita abutmen teeth.

USg.zuultgfaj

h

non Role of GrowthFactor in theReeeainofthePeriodontium and Future OralHealth Statu:ExperiencesfromJapan.M.MORIMOTO

(Rsearch

Sh

A el

Ridge.

T.HOWARD HOWELL(avrScolofDentalMedicine,

S

ssatiutst of ora Healthscience,Nihomuniversit, matsudo,chi-ba, Japn).

I

ll8

LongwoodAve,

Boston,

MA,USA).

Modern dentity

inJapan

has startedatthe

early

stage

after

the

Meji

RAsestato

by

Reopto

of alveolar bone occurs as aresultofperiodontal disease andasa

misonreoifmig

a setlement inYokohama =an the Dentist Law haslegistratedm

rwdigof

bonefollowing sooth loss.

Throughout

theyews,a

variety

of

sustances

nd 1906.1 Wishtoepantesbet hwn y tilthAcNeMpera%Wy hiaolcyof Japne

tehooishave

beenusedwithmoderae macus to

regeneate

the softand

hard

tisase of dentatyabuiy yesine10,m can stateta therecasJ

the peiodonium fllowig bon 10s1ptiom

Recently,

advance in theeness

ugw_be

eeoe fe heol a .Jpns hrceitco

obilgclresponew

nodiflem,

mschas

growth

factors givesus anew

oppoitunity

to theDets a,DentalHyginsLwadDental Tecesianm Law.Faxthe,allofJpne

mouaead,enac the

healing

of the

perodonta

woundandhastakenustoanewfrontier aeisrdbankndoscalnsacechm.Jpaneeusedasta carm eivr a in

peridonta

reeeaieterapy. Thbis

pemsonwill reviewxm of th

pmlnia

deeoeannaaldwthicesn

of

qusliy

and

quanuty~

Under the such cicmstances,

cliicaniudisl

hathav

cnfimeethtreenratvepohntil

fsletedgrothfacor. omln5edenalcar hatben ulile anooalde5thltats.mprve nalo.enhes

cnteti

Specfi

datafromseveral

uniquehua

clinicaltrialsrecently cmlee at

fae

PeriodontlSat xli punctually. ResarchCente at

Harvarsd

using growth faictors

machas ltee DerivedGrowth Factor

('PDOF). InsulinLike Growth Factor(IGF),andBone

Morphogenetic

Protein-2

(BMi5.2)

will

be

preseted.

diesM

ofth PhamacoloicEffectsOfFluoridein

Children

and

mutlt

mn

d Orofacial Pain and

Discomfort

among

Malaysian

Army

Personsel.

NMZ WAN

Stts n_{G, A.DUNIPACE.KA7Z}ris SlOEY

.JACKSON.

_{a U School of}Y._{Dentistry-,USA,}

U.

S.NIU,C.

0

HUSSAIN,_Malaya,_KualaIA_{Lumpur, Malaysia)}PAZAKC, ThMOHD DOM. (FacuiltyofDentistry, Universityof T'heaims of this

stuy

were

tolook into theprevalenceandimpactof

orofacial

painand The

purpos

ofthisseries ofsix

clincal studies

wasto

investigat

the

pharmacologic

effect

discomfort among202randomlyselectedMalaysian

Armny

Personnel(MAP).The

data

were

of lurie

nu

hilredad

dins xpseit

ecesivacncntatinsofflordeenxpcllctd

hrogha

elexdmiiserdiueveosarean

a

orloxaintin.ibot

0theth

presence

and absenc of

condition

which

were

considered

to have the

potentia

forcolcethogaslfadiW

dqutoniradanrlexmain.A

ut6Afte

eacraigany

advers effect

of

fluoride

if,in

fwct,

theyexist

These conditlons include

subject hadexperiencedorofacialpainanddiscomfort within the fourweekspriortothe

lieieigsinoffluoride in the

drinking wale

atfour

timnes

the

opiallvel,

osteporosis

survey.

Thepoint prevalenceforpain was38.1%

mand

46.5% for

discomfoit.

Out of the

sujects

bein trate

wihlredoses

of

fluoride,

diabess decreased

renal

fuco,ad

maliutrition

who hadpain,I

1/%

weregrantedleave and 40%had

disturbed

sleepduetopain.Despitethis

(i.e.,

Subotml

naeof

calcium and

protein).

Parmetes

investiate

included dental and only

one-quarter

of them consultedadoctorordentist andonlyabout half of them

sought

g#ssltal

fljorois. blood

enzyes

routinelY

Used to determine

organ

function and patient

treatment

promptly.

Amongthe

reasons

givenforthedelaywerethe lack of urgency,notime

wellnes

ScgeoeoxicitY

as

evidenced

by

siste

chromatidexchangeinblood

lypoye,and

duetoworkcommitment and theunavailabilityofadentist in the camp.Amongthosewith

cocnrtonOf

fluoride

in blood and

urine. Total

fluord

intake

was

also

determine

in

Patiets

in bothstudiesconducted in China.

The results

of

thas studies

jVwllcoatd

do w discomfort, onlyabout21.2%1hadconsultedadoctorordentist.The

majority

didnotseek

was noadverse effectof

fluoride

onorgan

function

or

patiet

wjessm

repardleas

of

tde

professional

help

becauise

they thoughtthatthe

condtion

wasnot too

serious

mand

theyalso took levelorduratio of

exposure

orthe

presence

of

medically.comnpromising

conditions.

Similarly,

self.

medication aimedatrelievingdiscomfort. The dentition

statu

of the MAP

personnel

was

them

wasno

evidence

ofa

genotoxic

effect

offluoride in any of the

studies.

Theonly

advers

better tha their

corresponding

civilian

populaton.

Howeverall

subject

showed evidence of

effect ofexcessie fluorideintake

obsered

in any of thes

studie

was

dental

fluorosls

(when

ingestedduring

infancy)

and skeleta fluorosisin the

studies

in

China

partcularly

in th periodontaldisease.Subject withmoredecayedteethare morelikelytoreport of dentalpain.

preence

of

tub-optimal

nutrition

It isrecmmenedththeMhe beMad waeo theinmvssneOf rahelhandits

noaible

conseauumac

tothe

militar

orniato

hwe is

als

anmd

to

iniroduca

faa

A"tie

Dental Suppor

(ASIorsa for

teenRsonnel

Howeverthso

rMmesoldQW

incolorte

a

nrmentive

and

health Promotion

comoponent.

Impactof Orofacial Pain and Discomfort in 16-17yrs-oldchildren in Prevalence of

sigris

of

temporomardidbular

disordera

innon-TMDaubjecs.

0

2

Johor, Malaysia.J.DOREYAT and N.JAAPAR*(Mis.of Health

Malaysia0

3

P.VNCAO*C.ST SOKanP.UE KL

& DeptofCommunityDentistry, UniversityofMalaya,K.Lumpur).

Faculty

of

Deritsitry, Chulakxngkom Urilverasty, Bangkok,

THAILAND Theobjectivesofthisstudyaretodetemirinetheprevalenceofclinical

signa

associated Thestudyaimstoinvestigatetheuseofsubjective

meamsures

usingorofacialpainanddiscomfort

with

temporomandibular

disorders (TMD) in non-TMD

subjects

arid to compare the and itsperceived impactas anevaluativetooltocomplementnormativeindices. Thesample prevalenceof those

sigris

irigroups ofsubjectswith

reapect

toagearidsex.Asampleof consist of420Malay children, huom2urban and2risra schools,aged 16.17years,whohad 193nori.TMD Thai subjectsfromnon-academilcstaff of the

Faculty

of Dentistywere

receivedtreatment

huom

the SchoolDenta Serivice thogottershoder.Sbetv aaciriicaltyexamined.Subjects included138femalesand55 malesrangingfrom

201to80

(orofaciapain) werecoilected

throughoasl-dinsee

uetionnire

whole

y

normatecive

data yearnofage. About

three-fourths

of thesubjects (74.1%)had at leastone

sigri

of TMD.

(orfacal

ain wee ce were

uouhasllectdmtrogi

acinicalx

q

examionation.

Thie

nomeanv

carie The most comm-on signs were masticatory arid/or jaw muscle tenderness (48.1%),

(DMF, CPITN,pain diagnosis)wr olce

iruhaciia

xmnto.n encfe deviation on mouth opening

(38.3%)

arid

temporomandibular

joint sounds (32.6%).

levelwaslow

(DMFT

3.4)withalmostnounmettreatmentneeds(DT 0.20,MT0.27)whileFT

Frequencies

of

masticatory

muscle

tendemmn

ranged

from

2.1%

for

the posterior

was2.99.Themajorityhadahealthy

periodontium

(61%

CPITN=0).

However

despitethe

temporalis

to35.2% for the

lateral

pterygoid

area,

moat

were

only

amid

tendermess.

Males

(5)

IDent

Res 77

(5)

1998

Divisional

Abstracts:

Souttheast

Asian

Division

1351

Co

.onfExercise HabitReversal and Placebo forMyofascial Thevalidity ofusing mandiular movement velocity as a diagnostic

parameter

0=4

Pi .LADPLI JRtRCO an LWGE

(hllogrn0-5

for Temporomandibular Disorders. ( C.Z.WU', C.M.LlU, S.L.CHOU. Taipei

University, Bangkok,

Thailand and

University

of

Minnesota,

USA).

Medical

College

School ofDentistry. Taipei,Taiwan.ROC.)

Thirty-five patients

witha.

primar diagnosis

of

masticatory myofascia pain

(MFP

participated

ina

study

usingashor-em(4-6

weeks)

randomized

placebo-controlle

EMG,bite forceanalysisandopeningamplitudeofthenmadiblehave been studiedfairly extensively clinical trial todetermine theeffcayof

stretching

exercise orhabit reversal in forthersensitivtyandspecificityas adiagnostic parameterforTMD,butnoneisofvabale" ai for

treating

masticatory

MFP. Patient were

randomly assigned

to either

stretching

thedifferentia diagnosisofTMD. The aimsofthisstudy aretotent the

asktivity

andspecificityof

exercise

(E),

habitreversal

(H)

or.placebo

medication control

(M)

group. Outcome usingnmandbularmovementvelocityasadiagnostic parameterfortheTMD.Thirty-three

non-measuresincluded

Symptom Severity

Index

(SSI)

tomeasure

subjecive pain

Muscle TMD

subects(24

males and9females,agesrangedfrom 21 to26 yearsold)andtwenty TMD

Index

(MI)

to measurethe numberof muscle

tendemess,

pressure

pain

threshold

subjects(16males and 4femaleswithcomparableagedistribution)jointedthe study.

Myotrnnics

(PT

madrnge

ofmotion measurement. The final datawereobtained from 10 KinesiographK-6systemwas

applied

forthe

ameaurement

nf

jawmotion

velocity.

Each subject

was

pains

ngOUP

E,

9

patients

in rou H and

9patients

in

group

M.Theresults of the isrce ooe n ls h ot Ltadwd spsil,tncniuu pndwsrk

bewen-group

compason

by

ANOV'A

failedto

reject

the.

Znulypotheses

thatthere isrce ooe n ls h ot sfs n iea osbe e otnosoe-ls toe

were

nogu

diffrences

relativetomean

change

from baseline for theoutcome

Weerecorded

before

and

immiediate

after

splin

insertion

and the datawereprocessed

for

the

mesuep00).Piestdn'f-etweeuetocmaetetetffts following

categories.(s).

Themaximal

opealng

velocity

(MOV),(2)theaverageopeningvelocity

within-each

ggroup. Patients in gro

upE

reported

painreductionand demonstrated (AOV), (3)themaximaldosing velocity (MCV) ,(4)the averagedosing velocity (ACV) and (5)the

decreased muscle

tendemness.

Mean

changes

for SSI MI and PPT for this groupwere maximalterminal velocity

(MTM

1mmbefore toothcontact.Mean velocitydifference betweenpre

statistically

significant

(p=0.003,

p=0.000

1, p=0.0d2,

respetively).

Mean

rnge

of splint insertion andpeat-splin insrtion in non-TMI) and TMD group was medfor the

motionwas al

~htly increased,

butnot

significanl.Patients

ingroup H also had calculationof thesensitivityandthespecificity. Analysisof data indicated thesensitivityandthe

tendenicy

towar

improvement

butnotstatistically sgificant. Patsentsin gruM

spedificity

among the fivecategorieswere0.65vs.0.45inMOV,0.59 vs.0.39 inAOV,0.50vs.0.30in

showed

statistically significant

reduction in the M

(p00).MCV,

0.80 vs. 0.30

lb

ACVand0.65vs.

0.48

inMTVrespectively.In

condlusion.

the

sensitivy

os

exris

hoe orae cnitnyfrmnvm

ttanhhtevsaontemxmal

closing

velocit

and

th ve

closing

veinety

ishi enug to

he

mied

as a

diagostic

aantuy1VF

isiiliaAra netetetaoemy o s nuht

araar

for evaluation of the

TMn.

This

studyis

supported

inpartby

NSC-85-2331-B-038-033.

tignificantly

improv sin and

symptoms-Trmatuaized

Anterior Teeth and

PsychosocilImpac:

The Malaysian The

Invlvmewnt

of

Pteygmadbular Space

In Latera

Pharyngal

106

Students'

Expcriecne.

K.C.LEE,R.ABDUL-KADIRO,and T.N. MD-DOM

0J7

Space

Infection.

P.KUIMPLANONT

(Hatyal

Regional

Hoap.Hatyal.

(Minof Health and

University

of

Malaya,

Kuala

Lumpur, MALAYSIA).

Songkhla

90110.

Thailand).

Traumaticdentalistiuiswhichare

quite

commonin many

countrilca

have receivedratherscant

attentionin

Malaysia

asevidentfromthe lackof local

studies

on this

condtion.

Limited

Latwerl phawyngeal space(LPS)

infectio

isoneof

fth

moat lie

threatening

maxlilofacial

information collectedfromearlierstudiespointtoahigh

proportion

ofunrated traumatic

infections.

Its

ettaorI awelling

may

be

mistake

in

diagnoais

and

treatment. This

atudy

injusies

among youngerscholchildren.Across-sectional

stuy

was

casTied

oitttodetermine the VS'odcen2 en N P ncmsmiyt coii.Ot

prevalenceofftrumatic aiurwiesin

permanent

anterior teeth ina

sample

of 2132 16-year-old

fescalcsondc

in 20

atInts

pwIthcuSl

nfetio

aeonuyw

to odo

ntoed origind

Other

students in thestateofMalacca.Inaddition,theamountof

fteatment

needsof

untreate

trauma feca pc netos atclrypleyoadblraaePS n umnlu

an well as its impact on

quality

oflifeofaffectedindividuala wax

ausseasd

through

a

apace(SMS),

wre amaseaed. In addition, fth locaton and speading

regions

were

questionaire. Findings

reveaedthat theprevalenceoftratsnaisedanteriorteethwaslowat6.1%.

confirmed

by

intreoal

e,mmination.

We found Bout of20

patienta

had

onlyLPS

inection

Males had

sigipficantly

higher

prevalencetha femalesat3.9:2.2 The

majority

hadonetooth

wherea

14

patiets

showed

LPS

infectionassociated

with

PMS(13

cseg)

and

SMS(1

injuredand themost

commnonly

involved tooth wasthe

maxlimy

centralincisors. Untreated cs) w e ntt hvdsaitc!o oainbtenkbW fLSw

traumtised

teethi

comprised

74.4%of alltraumatisedteeth in80.2%ofall

trmua

cases Ofth

Pae)-.0Fisher Tesc testbshowdistatisticlcreatPSIonf bestwe

infectons

fofa mSand

untreatedteeth,

58.5%

werefoundto require

utreanent.

Inaddition, 57%ofsubjectswith PSP001.Terslsidct htPSI h otcmo aua oc

untreatedtraumatisedteeth perceivedaneedfor

treatanent

with

aestheties

asthe

moat

commonly involvedintheinfection of LPS andshouldbe detected

early

to

prevet

sprading

to

reported reanon. The levelofrecortedimatamongthose withuntreatedtrunawaslowso LPS.

moderatewithoavholoeiealandsocal dvsfisnction ressrtedmore

freauonti

thai

fiuntonal

limitationor na anddisomfort Gentrllv.susbioct who

resoirted

imoact als nesceveda

nedforteatmentmoreoftenthanithonewhodidnoterev

MettcNeplasms In Jaw Bones In As Orienta Populatis J.F.YEO .9 TheRelationshipbetweenSmokingandPeriodontal Disease.

0-8

(Dcpw1rnent

of Oral and

Maxcillofacia

Surgesy,

National

University

ofSingapore, P.

Silarujisun.

S.Moonsarapeeand N.

Hongprasong'

(Dept.of

SINGAPORE) Perlodontology,Fac. ofDentiatry, Chulalongkom Univ., Bangkok, Thailand).

Inordertocollate

demographic

andclinical informationonmetatatic

neoplasms

lbjaw Previous

research

data indicated that

amoking

isoneof the

significnt

risk factors in the

beses an neea by dentiats in

Siagnpore

a iretrospective survey was dose lb developmentandprogression of

periodontal

disease. So thisstudy

wanted

toknowthe

Hintepathelogy

Laboratory, DepartmentofOral andMaxllofacialSurgery,NUSen relationship betweencigarette conSumptionandseverityofperiodontal disease, and to

biopyrqrtsoverapriodof 0yes, cfrm 141t 1M Fifeencase

ofcompare

theseverityof the disease among currentsmokers, formersmokers and

non-blepy rport ovr aecid o 40 ear, In frm 154 t 193. Fftoa

~smokers.

One hundred and fit periodontal patientsfrom

the

Periodontal Department,

mewnatatie

nooploamiis

warereported. Patients'agerangedfrom13monthsto65years FacultyofDentistry,

Chulalongktom University

who hadat

least

20

teeth with

4molars,were old

giving

ameanageef 38.5

year

*25.5

yearn

Mont cane fell latethe Ist decade aakedtocompletequestionaireaboutsmoking habita.

Smoking

consumption wasaclassified

(26.7%),4th decade(20%)and7thdoecad

(333%).

641%werefemales. Theracial tobelight (lessthan10

cigarettes/day)

andheavy (morethan 10cigarettes/day)

including

distributionwere:Chionee

(641%)

Malays

(20J4%),

Indians

(7.5%)

andethers

(7.5%).

thehistoryofsmokingfor the former smokers. Periodontal datawascolleced fromtheir

Thedurationofsymptomrangedfrom 3weekstoI

year.

Twe thirdsofcase occurred periodontal chart

recordis.

The severityofthe diseasewas

classified

bythedepth of

Inthe smadible. Asseelatedteet inamoa case wereloose. Pain andulcerations were periodontalpocket:slight (4-5 mm.),

mod1rate

(6-7 mm.)andsevere(morethan 7mm.).

reporte

Intwo cases

respetively.

No necknodeswerereported The

histologic

The datawas

statisticaNy

analysed

using

X

teat

(P<0.05)

by computerisedprogramSPSS. dlageaesInclded eadiferntlaed crelema,larg cel analastc caelnoa,

_dingom

sallIt

as

found that

smfoking

and also the levelofcigarette consumptionare

significantly

lrp

a

anapwc

crcinma,

mallto

theseverityofthe disease. Non-smokers have lessseverityof the disease than current

round cell

tumour, neuroblestows,

eberlocarelsoma4

nephroblastoma, neurogenic

smokers and formersmokers whileno

difference

in

severity

of the disease betweencurrent

sanreema

and

folmiuar carclnomna.

The

primary

tumoursiteswerebreast brain, smokers and former smokers. In theconclusion,

periodontal

p2atients,

who

ar

Suret

nanopharyna, lung,

thyroidgland, kidneyand

uteurs.

Itin

important

thatdentistsbe smokersorformer smokers will havemore

susceptible

to

periodontal

disease than

non-awareof such

seeindetv

uncommonmetastaticneoslamSwhen

masadglg

patientswith smokers And thelevel of

cigarette consumplion

isalso relatedtothe

severity

ofthe

osteoivtic lesionInthelawbones. diseasse This study waa supported by Dental Research Fund, Faculty of Dentistry.

Chuinlongktom

University.

Subgingival

PeriodontopathogensofSmokers and Ness-smokers in an Detection of

Porphyromnonas giagivalis

,

Bacteriodes forsytbus

in

As

o

-i

AsinPpulto. L.P.LI F.B.K.TY M.GUAANA-

1

AsianPopulation. F.B.K.

TAY,

L.P. LIM& M. GUNARATNAM

(FacultyofDentistry,NationalUniversityofSingapore) Facultyof

Dentisury

,NationalUniversityofSingapore

Smokingandsubgingivalinfection withspecific periodontopathogenshave been identified ax Porphyromonas gingivalis and

Bacteriodes

forsythis

have been implicatedindestructive factors whichincreasethe risk forperiodontitis. Theaim of thisstudywastoexamine the periodontal disease.

Various

mnicrobiological

techniquesofdetectingthese organisims havc

association between

cigarette

smokingandsubgingivalinfection withperiodontopathogensand been used. This includeanalyses byculture,DNAprobesandmorerecentlyPCR

(Polymserase

if smokersaremorelikelytobeinfected with certainperiodontopathogensthan

con-smiokers

in chainreaction). The purposeof thisstudyisto

identify

the presence of

P.gingivalis

anid

B. anAsian

population.

Microbiological analyseswas

performed

in 97malc adultPeriodontitis

forsyhus

usingthese different methods ofmicrobiological analysesinanAsian

popuilation

patients(35 non-smokers and 62smokers). Subgingival plaque sampleswerecollected from presentingwithperiodontitis. Subgingival plaque samples

were

taken from 94 malepatients

thedeepest palatalpocket(probing depths>5mm)ofeach

susbject

usingsterile paper

points,.rsetn

withpocket depthsofatleast

5mmn

were

sampled

from selected sites. The

samples

The

samnples

placedin VMGAIll

transport

mediaweresent tothe OralMicrobiology Testing for culturewereplacedin VMGA

trasport

media and thesamplesforanalyses byDNA

(6)

0-12

iunnglbui Alevelsin

"rapid'

anid 'slow"

plaque

formene. KY.

ZEE*

0- 3

Astinc,p'i

'n

W

t of

NrJli?I*

nsug

5AiVsival.5~o

0 -12

nd LP. SA ARANYAKE(FacultyofDentistry,T'heUniversityofHong Kong).

0OnB.Ypga,

No

K0p

sl (a.of

Denisitry,Fo.f

Salivary

inumunoglobulin

A(s-IgA)is knowntoplayarole in

aggregation

of oralbacteria,andhsence,

Scierse,

Psisar

of

Sengkla

Uhiiversity,

Hot

Yak, SonMgkla

90112,

ThalandL)

mayaffect the rate ofplaqueformation.

Therefore,

the aimof thisstudywasto

investigate

s-IgA Man m

l.d

havpes

. b

inused

io

idensateeify

aa it

sasoiesi

ayas

D.gNgiAl inoar

ma levelsin

"rapid"

and'slow"plaque

fomrsnr.

Forty-nine healthy volunteer werescreenedfor their

Honwever,

inuaopluaasys

still

qar

to

lhae

poeudis

inthe s

imollogled

disgasisi

Of

plaque formation rate.All thesubjectsreceived oralhygiene instuctionsandprophylaxisonce a piootldam.la aoeo wsuywnt netgt .gniai ue mlra weekfor 3 weeks in ordertoupgradetheir

gingival

health.

T'hereafter,

a3-daynooral

hygien

ero

l'frm

sin 1- ai W e bltig P.

gasgivafiu

ATCC

33277 was

started in ordertoassesstheplaque foematsonrateusingthe

plaque

usdex(PI).PIonthe buccal uusstyuaqte saalaiiigalslnediigthM1H!,p4..00 u

surfacso of all thecanines,

premnolars

and1stmolarswere recorded and 5subjctswith thehighest

d15

.

isute.

iar

a

msatastiir

hsotle.

sesooletsdin liaMHPoleSe

p

He4s

disslve in

ienca PI and S with the lowestmeanPIwereselectedas"rapid"and"slow"plaque forimer,respec- osou.'a ue nnawrsa sltdb mmhgtm ti0OOgh

tively. Unstimulatedwholeasiva seascollected intoaice-chilled beaker from each of these 10nib' the

psoycienmsi

utilude

agam

s

P.wguialzuw

wase

soLed

inrby

t sn

atar00pussatukw

2 jects.The saliva

samples

werethencentrifugedat

Il0,000g

for10 min. and the

supernsatants

we oute

Pblyceml

sfraoeiosCbinsetmi

Pgmgdno

adimatoacy

o

tlrebbrste

pm

oueia

wueru

s or

storedat-70"C until

analysis.

Referencescurvesfor

s-lgA

were establishedbytestingserialdilutions

byw

SD-PA-IOEu AfmadWsen

blmot

nayis.

Hve

iaar

guoctyia

of

owxuster pmunemim

ging

shWum

of humanIgAwith known concentrations. Thelevelsofs-IgAin thesaliva of all thesubjectswe 44t 78 kDa

wecre

sopised

by sera

raised

againto

Owa supanstat Mmar

.kDa

protein assessiedbyusingaconventionalELISAtechnique. Differences betweenthe2groupswerecompared exhibited

obvious reaotin

inboth

supersntaw

m

outer--

im a

-r

frastionar

liar

spaeihety

by usingStudentttest.Results showedastatistically significant

(p'Z0.05)

differencein themean of

antibodics

was

ecunfimned

by

positive

results

in

indirect

iriurnmhsioraoeaare

against P.

s-lgA

concentration between the

"rapid" (9g±gml

*1.9)and "slow"(I

7lsg/ml

*6.3)plaque formers.

*M

isuts urasa

thatte

Outrralra

f P

gsragiVAlis

moiaraiai This

sgests

tht

SAlA

may

contributetothedifferencsin

fth rafte

of

Rlague

formation in thesetwo 8*

5J5i

ninva

e ea iga

014 Effec ofDexamtliasoneonPeriodontal

Heaing

of

Replanted

Dog Teeth.V.SAE- Dental and

periodontal

healthstatusin Thai

vegetarians.

LhA',

Z.

METZGER,

hiTROPE

(University

ofNorth CarolinaatChapelHEil, USA). A ANIIIOG n .PESRNRN

TPrevious studeshave

ashown

ViaSpan

tobeanexcellent medias for the extended

storage

ofavulsed

(Faculty

of

Dentistry,

Chulalongkorn University, Bangkok,

Thailand)

testis

Also,

ithasbeenshownthat

replantation

ofteethintoa48-hour-oldsocket resulte ina It

han

beenfound that the diet of

vegetarian

isbeneficialtooralhealth,asreflected

by

a

high

pwrticulary

high

degree

of

inflammatory

root

resoption.

Itwas

hypotheized doat

this

resofption

wa numberof teethpresent,

improved

cariesstatus, and increased the resistance of

periodontal

relatedto

M'OM

'bi

withinthe tooth soeketatthius48hourtime

period, reslting

ina tissues. The aim of this

study

wastocompare thedental and

periodontal

healthstatusin

plethor

of

eytolacias

and other

prodbuct iplicated

inbone/root

resorption

Steroids havebeen

vegetarians

with their

non-vegetasian

controls,

Subjects

were130 Thai

lactovegetarians

who shown to

iunhbt

macrpsage

activation and its ceeucn.The purpose of the

presen

maintainedat

leat

5 yearsin

vegetarian

dietand 130 volunteer

non-vegetarian

controls. All

investiptionwastoevaluate

histologically,

theeffiectofdeaethasonein thepreventionof

r00

subjects

were

interviewed about their

dietary

habit.Of

tise

lactovegetarians,

76.9%1/

had 5-14 resoesionin soredandepissteddogs sees. Tentynineroot of beale dSS

~years

of

vegetarianism

and the

majority

(73,8%/1)

ate

only

one

meal

a

day.

The

dental and

weeeta

tedan ranomly

assigedqto

rusfr4 or

sotorg.Gou

p1.Teeth

(fgn.1) seth

periodontal

healthstatuswereassessed

by

oral examination. DMFT and

gingival

indexwere

stoedr

n val cotaivngViSpa

ony.Gropg2Teeh

n-t)

wrestoed.nGvalocotaiin

reistredhTevgetrias ndwontolsdionodifeiintheriarisspevaenet(8.5 v

Viapa and

deaehaoe(topical

treatment, -ceentratod

16

ug/snlGroup

3.Teeth

(n-6)'

60.8%; p>0.05).

T'he

number of

rmaidning

teeth,

DMCFT

and

gingival

index in the

storedinvials

ootasmingVanSunonly,bust

d amet-hason ws admnit ed

_vegetarians

and controlswerenot

differet (p>0.05). Although

the

prevalence

of

periodontal

(Systemnic treatmlent, 0.3mg/kg bse)

2dayspriorlo,onthedayof and the

following

2altenate

day

diseaseswere

numerically high

inboth group, the

vegetarians

showed

significantly

lower after

eVtAeto/elatto

After 12weeks, thedopwere

sacrificed,

theteeth

histlogicaly

periodontal disease

prevalence

than the controls

(81,5%

vs95.4%;

p-.0008).

There wereno

prepare man

evaluatedaccordingto

Andremsn

Themean

pereentage

complete

healing

inthe differences in DMFTand

gingival

index among the

lactovegetarians

regarding

totheir

Group

2

(85%)

was

signficantylhighertdon

thatinGroup1(69%)andGoup3(67%).Accordingly, durationof

vegetarian

diet This

study

diboemntae

htterdeta health in

vegetarian

the

-m

percentaep

inlmaoy

anrplacement

resoption

ofGroup2

(13%,

30%) werelower

incmarison

with theircontrols

hut

itdidshow

lespeaece

of

peridodntal_disease__n

tha thatinGroup1

(22%.

7%)and

Group

3(28V% 5%).Therewasanindication thattopicaluseof the

vegeta.rianss,

This

study

was

supported by

theDental Association of Thailand.

dexamethasoneresulte inanincrease ofcomolt healing and less resorotioncmolications.

0-1

6

VARDuMUM GMUivnty. mstk bed

0 -17

M.G.Boteho Prince

PhlpD

WHoapkAt

HongKong

Todsmisiina dirWhoinpraisdosmnbaldlicatlodailyself-adtidmi ree easwoweigaianedrevire(Wwa Pik). 7%kny Recasatudieshaveiveiogtedthesisiirobisldhot of-snoparat antbactrialagontaintodental udbj,satfidly bandedcidirdorsi puabrnawevemiicidandsmopiedsotwse ur,.Theybedminus slats wsntz materiaLs Theaddkie of antbacteralagnt inoGIC's may beusefu mareatosngcavkiti whaer ~ia5ivslr, -Sum ty diainat ysiasc usubtis iuininsin sen..r ty

ascariou.,tmstin eanyarbestarnrd-ceriu

yam

m

tmnsmdtrHiv*

ordet,et*addition

h

oddtim

ac5-ia

Siivid.a ft

mydim

e

ruAc

iandiims

did

-m

we

rtbo

es,

streWonos-i

agentslos manyhav datrimanstal

offesa

onthephysialpropertie ofthereatoetive material.Thesmof

Stssusssyoapsi. Stopo a o w"d i ot4o ubmwngv wrgwoltso cm thispilot

study

seas

to

invesptigt

theeffectsenthe 24

hour

coaVsepea

e

stregths

ofantlsactral (ownmiioAreadtiig ironic). Sutparewn dimdwiinginstroadaostb,abebii wein wivm sunrcionsformtingind W sem agnsaa oprated

intotlsaposeder

of

Fopi

DC.Twoanoawtwla agema daloohexdinehyreoid Pitaissu ewd dirone iaftnidihsmtignednics nisoino warewfridtwoasd os--hintadamws.'retdaulydir breakfuat (CXH) madruthisaide (CE'I)wvreaddedat0%

(eontsel)1%

3%and6%ceaeneraionby

wei&h

of

adofmuppw.mptionuemdnaccodancew donudectonsamewu with

othiosinvailaotphspos

fun ofPGPCMatIwiataw ers mixed.Maocordwh

mgndaccordig

ctasrurs' instructions mlM

ad iiseypm biaasi ns nern torinae e,i i ~in5i'~ as,iisis md in~ ~ ~

~90

cyhuhia

qsecin 6nsa

X

3zoma

mawinswewuroiedssin

a3.0:1

powedrto

ESquid

ratio

at80-80%

cmesuesse watrm,and

kips

indeviceri clas istin wediboust sachise ins Ni idir firm at iristrygin swes Isa ity

mad

steal

for 24

haour

in

deionizd

seatr

The

epsmamswr

vmo

deetedo

a

oossyreive

asswee. Allmbjrcusure us si ha instei sat onW rdtmpdiyknidam.drirgsin 5-web - oatinany. forcetohuimrinanlastren machine(meodellill)at acraWreadapsedlmasti mad theforc in

Searinsg

in dineahrIre 4-ad8-sushi,weid, sm -in take atOinoms- atdebas, insists,plsqwtsn din MPa's

caloulated.

ANOVAtea showed highl tigpflan reductions in coa m retrngthl ofat dlssntnis iuns papdlsy, nirsisa,adsiabawdgsgsva. Blaringindex sadhawieldis sodStis-e,hud

(P-0O0O01)

withtheadditionofof both CET sad CXAtoFuj i[L

Denatts

teatshowed

significant

Om ngkurcd. Pbqw kwWkr orWunplar.Mw

cb(Pi

Ootdodedferonceaba1tweinfthe

anttwaceerealtteat

t

grogpspanddtheecontroo

baewinslpetioedosiaheddihdir i 4wriaf wworneiigafisinw

Vrmp

(Pr0.05). tgi*vlainianime isirporriti 3%=127MPaSD3*15.2,6%--89MPaS1)13.9,CXH1%--I94MPaSD. 18.5,3%--165MPa SD*30,

slcammasd. Dsiatsoweiatienoarous-d. h si ~ernIeois su sselal iaei sreemlg

6%-Ifl0MPa

SD+13.7.

ptasr in isgcki m5emadiiltstiiAiis lb,wma ssaisdsino45penisi = ra sfias

Fromthipiot study,

itembeeooehsdethat h diino mlsgraaetsoPjIXshoul he

ad. is bans, is gis5loiss as5 ia sihnclsg in s-~~~oa1 i~pie

parioto

avoid

ei5eas

an

pis

eLGranttCRCGG373-252-0009

Isdlueneriflcticmid insufnsaisrotradlema sif

resu.modifasdsSia

woomerreoav _ Thermocyclungassameansofinducingmechanicalftiguieindentalcomposites. NHAbs

0-1 stleai M.

NOORt

adC.GTOOt (Depsesorit if Conievsaive Dereitey. Faculyof 0- 9 Kasim*and JF McCabe. Dental

Facslty,

UniversityofMalaya,MalsysiaaidDna

0 -18

Den"rytiUivertyofMolaya,

KualaLiAurif,MALAYSIA) School,UsiversityofNewcastlespotTyne,UK.

Resin-mod1iliedgasim oacstcrresoraivemate"iamasbecomingiouoeasingypopuAwarsrrstorative mtateialsbecoaseif The effectofthermocyclingoithefatiuebehaviour ofScommerciallyavailable dentalcomposites;

thai lasrovedbstdtig pupsertybust Sseintanowninsi dine

aesices

prpegoseuichas

nsiefate

nicebmwdas.

Tbe P50(P)l,SiluxPlusS),HeliomoioeH),Clearfit PhotoPosterior-tight

activated(CLA)

andCleartil

etsnwoftes ustiywas toevitkatstheuaifae maicmstdnrnof4essaciatldy avainlbt reuia-mdle

OMas

Posterior-chemically activated(CC)wasinvestigated. Onehundredandtenrectangularbarspecimens isuseesoateeiveimtwseei (Fmsj ItLC

(improvedt'.

Phsotac.Pil'i,

Virinne ind

Dyemct4),

a

conventional Slin

werepreparedfor each material and dividedintoI I groupsof10

each.

Test groups 1-6

were

ssbjected

iointinrre5Unki5ve mtittrmi (FuiaXGPt) ands

aiepoaite maerain (TPHt`)

wenestored

il0.01

itoiL/

la5i5 scid. to

t.

250, 500, 750,1000and 10000 thermalcyclesrespectively. Each thermalcycle consistedof sodiumaceste lauffeesobiion(pH4.1) fbr1, 7.and28daysas

coesswaed

totheasefae

marondatsu onmodnitely

niinuts

immersiontime of SO seconds perchange. Thecontrolgroups

7.11

werestored

is

distilled aflercure. wtra 7Cfrteeuvln iet opee20 0,70 00ad100temlcce

Teway ssimiplofoa.cimatmiweerenditsadforeacispenodofsonvneand10of

thers-mpesbetigsmugiedwiwtrt

hao teeliaettmet opee20 50 5,10 n 100temlcce

bonfadl

pn(Proinad').Eactamp

Wof10lo

mon war topshkidankplsiccoatiAMadstorest

bwuowrespectively.

Allspecimensweresubjectedto a3pointbendtestand loadedatacrossheadspeedof

(7)

JDent

Res 77

(5) 1998

Divisional Abstracts:

Souitheast Asian Division

1353

Utatructureof Resin-DentinInterfaceinScotchbondMulti-Purposein Wetand Shearing Strengthof Several NewDentinal Adhesives.

0-20

Dry Bonding. S.H.Y.WEIO, A,J.GWINNETT', F.R.TAY (Facultyof Dentistry,

0J21

W.M.A. IBRAHIM (FacultyofDentistry,University ofMalaya, 50603 Koala UniversityofHongKong.'SUNNYatStony Brook,NewYork) Lunspur, Malaysia.)

Keepingthedeminseralized dentincollagenmatrixhydratediscrucial foroptimal prinme infiltration in Thisstudy comparedtheshearing strengthofthreenewdentineadhesivesatonehour,24

hours

and

acetone-based,water-freeadhesivesthat involveacikd-cniioningof dentin. Thbisstudycomparedthe nine months. DenTASTIC,FUJIBOND and

OptiBond

werethe

materials

used forthis

study.

interfacialultrastrscturewhenScotchbondMulti-Purpose (SMP),awater-based adhesivewasused under Extractedliwuanmolarteeth that had beenruitintotwopieceswereused in

preparation

of

destine

differentdryandwetconditions. 20 dentin discswerepreparedfromrecentlyextracted third molars, specimens. For eachtypeofadhesive, dentine'surface wastreated accordingto

manufacture

Specimenswererandomlydividedintothre groups(n-6),based upon thestais ofremnainingmoisture instruction.Thespecimensweretestedfor

shesarng

strengthat

crosshead

speedof 0.5mmper

followingdentinconditioningwith IO0%maleicac-id for 15 seconds GroupI:surface air-dried for 3 minuteby usinganInstonmachine.Themean

andl

coefficientofdeviationfor each

teat

wwer

seconds:Groap11:dentinsurfacegentlyblot-driedtoremoveexcessmoisture(wetbonding); GroupHIl: recorded.The'resultshowedthat the shear

stregth

of

all

materials;

after nine months stored inan

additional lOlsLofdistilledwateraddto dentin surfacefollowing blot-drying(overwetcondition). ovenat a

temperature

of370C and 100percent

htuiidity;

Was

significantly

diffbeasce

comparedto

Following acid-conditioning,SMPprimerwasapplied. Dentindiscsfromn each groupwerethei bonded theits

early

shearstrength.

The

mean

shear

strength

of

FUJIBOND,

forexample,

decreasesl

fromit

togethe toformdisc-pairs usingSMPbondingresin. Theyweredeminealized inEDTA,embedded in

early

strength

of10.3 Mpato2.1 Mpaafter nine months. Reductionof shear

strength

for epoxyresin andprocessedfor TEMextamination. Comparisonsweremade with theremaining disc-pair, DnATCadOtBn eeol w-t he-odiefo . p o49Maadfo whichwasbonded withagenericprimer containing35% HEMA inwaterin theabsenceofVitreboad Mpato5.6Mpa

respectively.

Shear

bonding

strengthto

destine

variesbythetype of

adhesiv

polyalkenoicacidcopolymer. Iswasconcluded from theultrastuctural observcuation aerasaderasdwihtim.naar) sraetwoaterS-baadsUedOD oudesv

adhesivesuchasSMP is ableto rewetthebriefly desiccatedcollase matrixand that theuseofawe

mateoriasead

to

crfallei

a it

tiddl

rAne

stenahwencmaedwt

ohrerltgth

ofD

TAI

UJB

otWdb

bonding

technique

is notcritical:bi failuretoremoveexcesswatercouldresul indihitionortmven aeorsdt g naMdernt

trnhwe

ihohred fglo

d

distributionof the water-soluble orinicr conusonents within thezoneofdemineraized dentin.c)

ph=s

rdcs hl piodcudh osdrt alahg ae teeh

separaion ofthe

narialIX

water-solublenolvalkenoicacid

co2alvm=r

occurredalone the resin-dentine

interfacean ihi h dentinal tubulesaselectron-dense sziobulescontainingelectro-lacetdomains.

(Supported bytheCRCGgrant,theUniversityofHongKong)

Coprsnof

VariousMetal-CeramicBond

Strength.

Mechanical

Properties

of

Ag-Pd-Au-Ca

AlloysforUltra-ow

Fusang

Porcelan.

0 -22

V. IYAPRAVAT*, 0. PIITAYAWUTVINIT, S.PRAKOBJIT,

0 -23

IL

OGURA*,A.

NAKAI,S.GOTO, Y. MIYAGAWA

(The

Nippon'Denal

Univasity,

K.VIBULSAVATDIWAT, and N.JUNTAVEE School of

Dentistry

at

Niigata, Dept.

of Dental MaterialsScience,

Niigata,

Japa)

(Khon-Kaen

University,

FacultyofDentistry,Khon-Kaen,Thailanid) Commerciallyavailablealloysforultra-lowfusing

porcelans

consist ofmainlygoldand show rela-Successofmetaceramricrestorationisbasedupon thenatureofbondingbetweenmetalalloysand

dentaporcelain.Thinsstudycompasesshear bondstrengthof three dentalporclainwhichare: tivelylowstrength.Anotheralloysystemconsisting mainlyofAg, Pd,AuandCu(Ag-Pd-Au-Cu

Unibond(Shofu), Carat(Dentuply),andSpectram (Dentsply)tothreemetaceramiicalloyswhichare alloy)was

previously

investigatedinorder notonlytoreducethe

nmateral

costbutals toimprove

:Argedeat8li (Argen), Argeloy(Argen)andTechawr(LeAch&Dillois). Each

alloy

wascastedinto

the

mechanicalproperties. Althoughthe

efficacy

of thisalloysystemwas

reported

atthe29

nmeeting

meta disc of10mnmin diameterby using

omenrifugal casting

technique.Tennmealdiscsforeach

groupofvasiousdentalporceain combinationtPorcelanwasapplie tothecenter

pprtic

of disc of theJapaneseSocietyforDentalMaterials and Devices inApril,1997,themechanicalpropestics

surfaceusin silicone

forming

mold,sisteredprocessingand

forming

porcelain

cylsnder

of 5.0mmin Of

these

alloys

were

notevaluatedin

detaiL

The

puspose

ofthe

present study

wasto

evaluate

the

diasneeran3.0OmmthiciL Theseweretea shearbond

strength

onaniversaltqstingmachineat

2mmfmin crouhead

spend.

Shearstrengthvalues(MPa)obtainedwere

statistically

analysisusing mechanicalpropertiesofthes alloys.Ninedifferent Ag-Pd-Au-Cu alloyscontainin either 5% Snor ANOVA andTukey

mulpiplecomparison

thatrevealstatisticallysignifscantdifferenoe between 5%

Oawere

prepare

usinghigh-induction

meltng

in

argon atmosphere.

Thecompositionof Ag-Pd-experimental

groups

(at

p=0.0S).

SEMexanmination appearedtofaidatinterface with ommporcelain Au-Cualloys

were

20-50%/Ag,

20-40V.Pd,

20%Au and

l0-20%/'Cui

Thespecimensfor

tensile

test

remainin adherenc onthemetalsurface.

Pbrodain & Metal Tockstar wW~~~~~~~~~~~~an hardnesstestwereprepardandsubjectedtothetest followingtheISO9693:1991 fordental Unibond29.&3*13.73 27.193t 1 0.03

19.02*7.33

~~~~~~ceramic

fusied

tomies restorative material.Fromthetensiletest,theirultimatetensile

strength,

0.2% C-ff 6.2* .0 4.3178 offset

proof stres,

elongation

andelasticmodulusweredetermined and

their

Vlckas.hardness

was

Spectrum26-46*12.44 16.89*3.25

I7.67;9.T_T__

~~~determined

from

thehardnesstestThedata

were

stestiscally

analyzedusing

ANOVA.

The results

mdtatedia ifolm osn nml

mamcbodSiMUh

showed that:

1)

theevaluatedmechaical

properties significastly

changedwiththeincrease of Pd and

Cu, 2)

Some ofthe

prepared

alloys

showed about 700MPa

proof

stres which is competitiveto that of

conventional

Pd-Cualloys,and3)

the mechanical

properties

oftheAg-Pd-Au-Cu alloys were

significanty

influencedbytheadditonof Sn andGa.

A'A

Study

ofA

Pd-Ag-Sb

System alloy

for

Metal0-Ceramics.

Pramno Limkool Acute

Toxicity

of

Polyesters

inAnimal Research

0J&24

andToshioSumiJ

(Faculty

of

Dentlatry, Chianog4Mel

Unhferity.

Chang-Mai,

0 -25

W.

SISWOMIHARDJO

(Gadjah Mada

Univ.,Yogyakcarta,

Indonesia).

Thailand,Bkomafteral SclncsUnitSydney

University,

Australia).

Acrylic

resinisoneof themost

popular.

materials in

dentistry,

and it hasbeen the

only

metal ceramic

restoatins wre

wdely

used Indentl

prsctice,

becaus strongand

polymeric

denture base materialsfor many years.

Acrylic

resin doesnot

fusllfil

the

accurate metal casting

canbe combined WIt aesthetI and abrasion-resistant cerna-is

requiremnents

of an ideal denture base macteial. Residual monomner

(methyl

The

present

sxtuy

issimnedat

developing

silverbase

alloy containing Antimony

and

methacrylate)

in

acrylic

resin

causesirritation

of

the oralmucous

(Tsuchiya

et

al,

J other elemetn for metal ceramics.

Composition

54.2

Pd-36,2Ag-7Sb-2.9in-1.OSn-

Prosth

Dent

71:618-630,

1994)

and

according

toLefebvreetal

(J

Bf

omater

Sdi Polym

1.OGa(alloy

No.

10)

was

finaly

selectedasthe bestfor

practca

applications.

Uqukdus

Ed

7:965-976,1996)comnponents

usedin dentalresins may alter

various

cellmetabolic and solisus teprtrsof this

alloy

war

1,250

- C and

1,087'

-C

Under

fired

processes.

Siswomihardjo (preliminary study, 1996)

stated that

polyesters,

a

polymeric

conditions,

theVickers hardnessnumber, tensil

sftrngth

and

elongation

ware270,647 material

for

statuescanbe

manipulated

todenture

base,

while gas crmtgah

Mpa

and 3.4%

respectively.

In the

temperature

rangefrom

20'

Cto

O00

C thethemal examinations showed therewas no

residual

mwoinoerorother

components

released enpansionratewas0.87% and thermalexpansion coeffclent WIaS

15.OXIO-"r

C.The from

polyesters.

Data

proved there

was no

toxicity

of

polyesters

in human

cultured

result obtained for test of shearbondstrengthofalloyNo.1 wavshIgwher

58W

lymphocytes

(Siswomlhadjo

et

al,

IA,DR/SEA:48,

1996).

This

research

examined

the

on te avrage whihwa as tron as IK (6.5A-8.Od-4.Pt-0BAg-.S

~acute

toxicity

of

polyester

inrats.

There

werethre

treatment

groups andonecontrol.

elmntse

alloy

fo

metalh

cermis)

sbete

an

ta

n any other

PdAg

orPdCu

6An49oys

I

The

dose

variations

were67.5 mg 135 mg and 270 mg

respecttvely.

Examinationwas

easyf

casting bettr

bndflceaing

strng

bth.eAllo ano.

10 h PdA o

sPdCu

ibiity

nth

done 24, hours after

treatimet

andnoratswerefound dead. Therewas nodifferent

commercial

porceleins (Vita,

Ducera andAAANoritake

porcelalina).

Themechanical

histological

fsndings

in the

digestive

organs

amnong thc

four groups.

ItLcna

manipulation propestlsof thisalloyww sad toybdiia

wOaf

concluded that

oolyesters

wasnot

absorbed

sothat

noQ

toxicity

was

found

in

rats.

LowIntensityLaser-ModulationOfProstaglandin-E2 Production Is Mechanically ResponsesofPulpa

Macrophage-assoclased

Antigen-expressling

CelktoTooth

0-26

StimulatedMyoblasts.S.

SATrAYUT*,

P.F. BRADLEY andF.J. HUGHES(Saint

0J27

Replantation.

S.RUNGVECHvurJT

TIFTAYA1*,

T.

OKIJII,

.rAOKI2.K.

Bart's andRoyalLondonSchoolof MedicineandDenfistry,LondonElI2AD,UK) OHYA2 andH.SUDAI

(DeptL

of

tEndodontics

and

51Denta

Pharmacology,

Tokyo

Med.

&

Dent.

Univ,

Japani).

efficacy

ofLow Intensity LaserTherapy

(LILT)

for

fth

Immunohistochemnistry

andconfocal laserscanning

microscopy

(CLSM)wereappliedtostudy

nmaagement

of musculoskeletalpain,butitsmodeof actionisnotclear. The aim of thisstudywasio kinetics ofpulpal-

macrophages

and

class

11

MHC-expressing

cells inreplantedimmatureratmolars.

investigate

the effect of LILTon prostaglandin E2 (PGE2) production by myoblast cultures Upper rightfirst molars of

5-week-old

male

Wistar

rate

wereelevatedandreplanted. At8hto84

undergoing stretching

bymechanicaldeformation. Cells

fromn

themouseskeletalmuscle cellline days postoperatively, specimens wereobtained

and

subjected to

immunoperoxidase

or

C2C12wereplatedin flexible base

petri

platesandculturedinDuthecco's-MEMmiediumwith10% immunofluorescencestaining using

mionoclonal

antibodies

0X6

(anti-rat class II

MHC

molecules), FetaBovineSerum (FBS)untila 70-80% confluent. Cultureswerethenmaintained inmedium with EDI(anti-ranmwcrphagesanddendriticcells) and ED2 (anti-rat resident

macro1shages).

Between 1%FBSfora

further

7daystoallowmyoblastdifferentiationtooccu'r. For

experiments,

cultures 3 and7dayswheln pulpal

depenerative

changeswereprominent,anaccumulation ofEDI+cells were

mehanically

deformedeverySseconds fora35-secondperiodfollowedbya 15-miinuteres withstrogintra-cytoplasmic immuntreactivityand 0X6+cells

was'

foundpeoinantly along.the

periot;

thisactivitywasrepeated20 times in 5 hours. In additiontestcultureswereinfadiatedtwithan pulp-destiniebordercorrespondingtotheenamel-freecuspalarea. CLSMreeldthatsomeofthe

0X6+

cells

withdendriticmorphology

projected

their

dendrite

into

she

dentinal tubules. A 820 m OAlA lasr aenrgydensty 0.36 0.63 1cm5and owe desit a 0008- 0009 migrationof

EDI+/ED2-/0X6-

cellswasalsofrequentlyobiervedincontactwithacell-rich