Top PDF Evaluation of the Effect of Propolis Nanoparticles on Antimicrobial Properties and Shear Bond Strength of Orthodontic Composite Bonded to Bovine Enamel

Evaluation of the Effect of Propolis Nanoparticles on Antimicrobial Properties and Shear Bond Strength of Orthodontic Composite Bonded to Bovine Enamel

Evaluation of the Effect of Propolis Nanoparticles on Antimicrobial Properties and Shear Bond Strength of Orthodontic Composite Bonded to Bovine Enamel

group and four composite groups containing 1%, 2%, 5%, and 10% prpNPs were evaluated in this study. A laboratory scale (U.S. Solid, ND, USA) with a precision of 0.0001 g was used for weighing the composite and nanoparticles. The nanocomposites were stored in a dark environment at room temperature before bonding. Sixty sound bovine incisors without any enamel cracks, decay, erosions or fractures were collected. They were kept at 4°C in a solution of 0.5% Chloramine for four weeks. Afterwards, the samples were randomly divided into five groups (n=12): four groups for bonding with nanocomposites and one group for composite without prpNPs. The teeth were cleaned using a prophylaxis brush, then rinsed and finally dried. The buccal surfaces of the teeth were etched with 37% phosphoric acid gel (Ultra etch; Ultradent Products Inc., South Jordan, UT, USA) for 30 seconds, then washed with water for 30 seconds and dried with air without moisture or oil. A thin layer of bonding primer (3M Unitek, Monrovia, CA, USA) was placed uniformly on the etched surfaces of all teeth and exposed to a light-curing device (Demetron, Kerr, Orange, CA, USA) for 10 seconds.
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Effect of Addition of Curcumin Nanoparticles on Antimicrobial Property and Shear Bond Strength of Orthodontic Composite to Bovine Enamel

Effect of Addition of Curcumin Nanoparticles on Antimicrobial Property and Shear Bond Strength of Orthodontic Composite to Bovine Enamel

The current study also assessed the antimicrobial activity of Transbond XT composite containing 1%, 5% and 10% concentrations of curcNPs against S. mutans, S. sanguinis and L. acidophilus. The three selected bacterial strains are the main constituents of dental plaque. Initiation of caries mainly depends on the activity of S. mutans while lactobacilli (mainly L. acidophilus) are responsible for progression of caries. Presence of S. sanguinis in the oral cavity decreases the population of S. mutans and these two are in equilibrium [27]. Biofilm inhibition test was carried out to assess the antimicrobial activity of composites since it has been shown that bacteria in the form of biofilm are four times more resistant to antibacterial agents compared to planktonic form [28]. The current results showed that addition of curcNPs to composite significantly decreased the bacterial count of all three strains compared to the control group in all three concentrations. The results for S. mutans were highly favorable since S. mutans colony count in presence of all concentrations of curcNPs decreased to zero. This indicates low minimum inhibitory concentration and minimum bactericidal concentration of curcNPs against S. mutans [29]. This finding is clinically significant since S. mutans is the main cariogenic microorganism in the oral cavity. On the other hand, L. acidophilus showed higher resistance, which may be due to its role in progression of caries and formation of a very strong biofilm. In
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The Effect of CuO Nanoparticles on Antimicrobial Effects and Shear Bond Strength of Orthodontic Adhesives

The Effect of CuO Nanoparticles on Antimicrobial Effects and Shear Bond Strength of Orthodontic Adhesives

Materials and Method: CuO nanoparticles were added to the composite trans- bond XT at concentrations of 0.01, 0.5 and 1 wt.%. To evaluate the antimicrobial properties of composites containing nanoparticles, the disk agar diffusion test was used. For this purpose, 10 discs from each concentration of nano-composites (total- ly 30 discs) and 10 discs from conventional composite (as the control group) were prepared. Then the diameter of streptococcus mutans growth inhibition around each disc was determined in blood agar medium. To evaluate the shear bond strength, with each concentration of nano-composites as well as the control group (conventional composite), 10 metal brackets were bonded to the human premolars and shear bond strength was determined using a universal testing machine. Results: Nano-composites in all three concentrations showed significant antimi- crobial effect compared to the control group (p< 0.001). With increasing concen- tration of nanoparticles, antimicrobial effect showed an upward trend, although statistically was not significant. There was no significant difference between the shear bond strength of nano-composites compared to control group (p= 0.695). Conclusion: Incorporating CuO nanoparticles into adhesive in all three studied concentrations added antimicrobial effects to the adhesive with no adverse effects on shear bond strength.
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Shear Bond Strength of Orthodontic Brackets to Composite Restorations Using Universal Adhesive

Shear Bond Strength of Orthodontic Brackets to Composite Restorations Using Universal Adhesive

Materials and Method: In this in vitro, experimental study, 45 composite discs measuring 6 mm in diameter and 4 mm in thickness were fabricated and assigned to three groups (n=15). In the group 1, discs were etched with 37% phosphoric acid for 15 seconds and Scotchbond Universal was then applied. Discs were roughened by diamond bur in the group 2 and were subjected to the application of Scotchbond Universal. In the group 3, conventional adhesive (Single Bond 2) was applied after roughening the discs by diamond bur. Metal brackets were then bonded to discs and after thermocycling, the SBS was measured by an Instron machine. The mode of failure and adhesive remnant index (ARI) score were determined using stereomicroscope. Data were ana- lyzed by SPSS version 18, one-way ANOVA, and the Kruskal Wallis test. Results: The surface roughening plus universal adhesive group showed the highest SBS (11.90 MPa) but according to one-way ANOVA, the difference in this regard among the three groups was not statistically significant (p= 0.94). Most samples showed ARI score of 4.
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Evaluation of Effect of Polypropylene on the Mechanical Properties of Concrete

Evaluation of Effect of Polypropylene on the Mechanical Properties of Concrete

Utilization of randomly distributed fibers in composite material is not new. Since time immemorial, fibers such as straw, horsehair and other plant fibers were used to strengthen brittle materials [ACI 544.1R (1996)]. However, post 1960, much development has taken place in this respect and many fibers have been produced for improvement of most important mechanical properties of concrete. Large number of research has been carried out on fibers and, fortunately, the results of those researches showing the ability of these materials to improve the mechanical properties and durability of concrete. Modern developments and global interest on the subject took off during the following studies in the early 1960s by Romualdi on the use of steel fibers in concrete [Romualdi et al (1964), Romualdi et al (1969)]. Biryukovish used glass fibers in concrete in late 1950s.[Biryukovich et al (1965)]. After this initial work, a substantial amount of research, testing, development and industrial application of fiber as a reinforcement in concrete has taken place.
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A Comparison of Shear Bond Strength of Orthodontic Brackets Bonded with Four Flowable Composites Bonded under Contamination: An Ex-Vivo Study

A Comparison of Shear Bond Strength of Orthodontic Brackets Bonded with Four Flowable Composites Bonded under Contamination: An Ex-Vivo Study

After acid etching, a thin layer of Transbond XTprimer up were divided into 2 subgroups (N=10) and four flowable composites (Esthet X Flow, (Dentsply); Admira, (Voco); Helioset Orthodontic, (IvaclorVivadent); Restofil N Flow, (Anabond) and a conventional orthodontic bonding system Transbond XT( 3M After the application of primer, half of the teeth (N=10),in 0.01ml of human blood and then air water spray was used for 5 seconds to decontaminate the surface. Compressed oil free air was used urface. The blood was collected from the One hundred stainless steel metal premolar brackets with a etched base (3M Gemini, 0.022 slot M.B.T. premolar brackets) were directly bonded to the acid etched enamel. ed to the base of the brackets, oriented with their bases parallel to the floor and pressed firmly against the enamel surface, and excess removed with an explorer. The samples were light cured (3M ESPE, ELISPAR 2500) for 20 seconds, (10 The same procedure was done with the other half of each experimental group (N=10), but using human saliva. The saliva was collected from a donor who was instructed to brush teeth and refrain from eating for 1hour so that saliva
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An Invitro Study to Evaluate the Antibacterial Property and Shear Bond Strength of an Orthodontic Adhesive Combined with Two Different Nanoparticles

An Invitro Study to Evaluate the Antibacterial Property and Shear Bond Strength of an Orthodontic Adhesive Combined with Two Different Nanoparticles

was produced by any specimens stored in water for more than 2 weeks. According to Imazato et al 79 methacryloyloxy dodecyl pyridinium bromide(MDPB), can be successfully used in adhesives for arresting the residual bacteria after bonding but the tensile bond strength of experimental adhesive was less than the control and had adverse influence on bond strength. Othman H et al 80 added an antimicrobial agent, Benzalkonium Chloride (BAC), to a chemically cured composite resin Reliance Phase II composite to create modified composites with BAC concentrations ranging from 0.25 to 2.50 wt.%, and the antimicrobial benefits and physical properties of the modified composite were evaluated. The incorporation of BAC in composite material added antimicrobial properties to the original compound without altering its mechanical properties. This study did not investigate the effect of aging on the composite’s physical and antimicrobial properties. It has been reported previously that aging composite material stored in distilled water or saline solution shows a reduction in the modulus of rupture.
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The Influence of Resin Infiltration System on Sound Enamel Microhardness and Shear Bond Strength of Orthodontic Bands: An In Vitro Study

The Influence of Resin Infiltration System on Sound Enamel Microhardness and Shear Bond Strength of Orthodontic Bands: An In Vitro Study

The caries infiltration product ICON; a new virtually painless method, was introduced in Germany in 2009. This product utilized a special resin to seal and fill demineralized enamel without causing the loss of healthy hard tissue 29 . Icon can be used for the microinvasive treatment of initial carious lesions in the vestibular and approximal regions. The vestibular version is particularly developed for orthodontic patients after removal of braces 29 . To our knowledge, only a few studies have been conducted regarding ICON, and those have shown promising results 30 . Most studies were testing the effect on the orthodontic brackets 31-33 , other studies were investigating using the resin infiltrant for treatment of the incipient carious lesion and white spots development 34,35 .
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Effects of cyclic loading on the shear bond strength of metal orthodontic brackets bonded to resin composite veneer surface using different conditioning protocols

Effects of cyclic loading on the shear bond strength of metal orthodontic brackets bonded to resin composite veneer surface using different conditioning protocols

There are many factors that potentially influence the bond strength of orthodontic attachments to composite resin surfaces such as the type of composite resin, the film thickness of adhesive resin, moisture, contamin- ation, the dimension and geometry of the bracket base, storage conditions, aging of the composite, and method of testing [5-8]. Surface treatment techniques are an- other crucial factor influencing the bond strength values. These involve mechanical or chemical approaches to roughening the surface and increasing the surface area for bonding. Inappropriate surface treatment of laminate veneers before bonding orthodontic brackets can result in fracture or loss of the underlying laminate during debonding; furthermore, adhesive remnants require re- moval [14]. The additional cost of cleanup or replacement of the restoration must be considered. Additionally, in an in vivo situation, bonding systems are more likely to be challenged by repeated applications of stresses that are below the maximum stress that these systems could with- stand. Therefore, fatigue test results would provide more accurate predictions of the in vivo performance of ortho- dontic bonding systems [11,19-28].
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The Effect of Aloe Vera, Pomegranate Peel, Grape Seed Extract, Green Tea, and Sodium Ascorbate as Antioxidants on the Shear Bond Strength of Composite Resin to Home-bleached Enamel

The Effect of Aloe Vera, Pomegranate Peel, Grape Seed Extract, Green Tea, and Sodium Ascorbate as Antioxidants on the Shear Bond Strength of Composite Resin to Home-bleached Enamel

Another study showed that application of pome- granate peel extract, grape seed extract, green tea, and sodium ascorbate on enamel bleached with 40% hydro- gen peroxide neutralized the effect of residual oxygen molecules on the bleached enamel surface, and in- creased the SBS of composite resin. [24] The concentra- tion of antioxidants were similar to the current study, but we used 15% carbamide peroxide as the bleaching agent which is weaker than hydrogen peroxide and could produce less residual oxygen molecules. Appar- ently, the effect of antioxidant on the SBS would de- crease as the bleaching agent concentration decreases.
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Effect of different anti oxidants on shear bond strength between nano hybrid composite and bleached enamel-an invitro study

Effect of different anti oxidants on shear bond strength between nano hybrid composite and bleached enamel-an invitro study

Fifty recently extracted human single rooted teeth were divided groups of 10 teeth each. In Group I (positive control), the composite bonding was Except Group V (negative control), the labial enamel in the other groups were bleached with 35% hydrogen peroxide composite restoration. Groups II, III, and IV specimens were treated with antioxidants 10% sodium ascorbate, 10% pine bark extract, 10%Aloe vera respectively, for 10 min and bonded with composite resin. All specimens were stored in deionized water for testing by using universal testing machine.The data and statistically analyzed using analysis of variance One way wed the highest shear bond strength followed by the bleached teeth treated with the antioxidant 10% Aloe vera.
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Assessment of the Shear Bond Strength between Nanofilled Composite Bonded to Glass-ionomer Cement Using Self-etch Adhesive with Different pHs and Total-Etch Adhesive

Assessment of the Shear Bond Strength between Nanofilled Composite Bonded to Glass-ionomer Cement Using Self-etch Adhesive with Different pHs and Total-Etch Adhesive

In this experimental study, 40 specimens of 6×6mm were prepared in 4 groups (n=10) in acrylic mold (2.5×2.5 cm). First, a hole (3mm height×6mm diameter) was created at the top of this acrylic cylinder by using bur #14. This hole was filled with ChemFil Superior GIc (Dentsply; Germany) with a proportion of 2:2 in powder and liquid according to the manufacturer’s in- struction. The excess of GIc was removed by celluloid strip and glass slap in order to put the GIc and the acryl- ic molding at the same level. It was accurately checked for each specimen. After 7 minutes of initial setting of the GIc, the adhesive resin was applied on the surface of GIc (all according to manufacturer's instruction) (Figure 1). As represented in Table 1, the adhesives used in this experiment were self-etch strong Adper Prompt L-Pop (3M; ESPE), intermediate OptiBond (Kerr; Orange, CA, USA ), mild Clearfil SE Bond (Kuraray; Tokyo, Japan) and total-etch adhesive Adper Single Bond 2 (3M; ES- PE). Then, they were all light-cured by an LED light- cure device (Kerr Corp.; Orange, CA, USA) with an intensity of 1200 mW/cm2. The tip of the light-curing
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Shear bond strength of a bracket-bonding system cured with a light-emitting diode or halogen-based light-curing unit at various polymerization times

Shear bond strength of a bracket-bonding system cured with a light-emitting diode or halogen-based light-curing unit at various polymerization times

35. Goodis HE, Marshall GW, While JM, Gee L, Hornberger B, Marshall SJ. Storage effects on dentin permeability. Dent Mater. 1993;9(2):79–84. 36. Miranda WG, Placido E, Moura SK, Cardoso PE. Influence of postex- traction substrate aging on the microtensile bond strength of a dental adhesive system. J Adhes Dent. 2005;7(3):193–196.

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Surface preparation and isotropic shear bond strength properties of superficial bovine dentin

Surface preparation and isotropic shear bond strength properties of superficial bovine dentin

The effect of different types of surface preparation with SiC abrasive paper on the shear bond strength (SBS) of superficial bovine dentin obtained from the incisal, middle and cervical thirds were evaluated. Dentin substrates were obtained with twenty speci- mens for each location-grit combination. Superficial dentin was exposed and prepared to 120-, 320-, or 600-grit SiC; the dentin surfaces were treated with Optibond Solo Plus (Kerr) and polymerized for 20 s. The specimens were placed in a jig, filled with resin composite Z100 (3M-ESPE), polymerized for 40 s ac- cording to manufacturer’s instructions, and stored for 24 h at 37˚C and 100% humidity. After 24 h, SBS was measured using a loading testing machine (Ul- tradent) and expressed in megapascals. A two-way ANOVA and Tukey test were used for data analysis. No statistically significant effect of the location (P = 0.254) or interaction grit-location (P = 0.629) were observed on SBS. Statistically significant effect of the grit on the SBS was detected (P < 0.001) with 320-grit being statistically different from 600-grit (P = 0.011) and 120-grit (P < 0.001). No significant differences were observed between 600-grit and 120-grit (P = 0.413). Regardless of the location, 320-grit consis- tently showed the lowest SBS indicating that different surface grit preparations have an effect on dentin SBS values.
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Effect of Cyclic Loading on Shear Bond Strength of Orthodontic Brackets:  An In Vitro Study

Effect of Cyclic Loading on Shear Bond Strength of Orthodontic Brackets: An In Vitro Study

to simulate clinical conditions in laboratory testing as much as possible. In the current study, 10,000 cycles were applied because this was the highest frequency of cyclic loading submitted during fatigue testing [9, 14]. It has been reported that chewing and swallowing result in approximately 1,800 occlusal contacts per day [3]; however, not all occlusal contacts cause pressure on orthodontic brackets. In the present study, no significant differences were observed in either bonding group before and after cyclic loading. The lack of statistically significant differences in bond strength following cyclic loading might be because of an insufficient number of cycles to represent the clinical situation. In addition, the magnitude of chewing forces might be higher especially in young adults. Moseley et al. [24] reported that the effects of fatigue depend on the magnitude of load in cyclic loading.
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Evaluation of a New and Advance Curing Light on the
Shear Bond Strength of Orthodontic Brackets

Evaluation of a New and Advance Curing Light on the Shear Bond Strength of Orthodontic Brackets

Introduction: With the introduction of photosensitive (light- cured) restorative materials in dentistry, various methods were suggested to enhance their polymerization and curing time including layering and the use of more powerful light curing devices. The purpose of this study was to comparatively evalu- ate shear bond strength of stainless steel bracket using conven- tional halogen light and light-emitting diode (LED) curing units. Materials and methods: This in vitro study was carried out in the Department of Orthodontics, Pacific Dental College, Debari, Udaipur, India. Sample included 120 freshly extracted human premolars collected and etched by 37% phosphoric acid, washed and dried, and sealent applied. Then preadjusted edgewise upper premolar stainless steel brackets were applied on the teeth. The teeth were divided into groups of six, each group having 20 teeth. Group I was cured by halogen light curing unit by 10 seconds, group II is cured by LED curing unit by 10 seconds, group III is cured by halogen light curing unit by 20 seconds, group IV is cured by LED curing unit by 20 seconds, group V is cured by halogen light curing unit by 40 seconds, group VI is cured by LED curing unit by 40 seconds.
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Comparison of shear bond strength and adhesive remnant index between precoated and conventionally bonded orthodontic brackets

Comparison of shear bond strength and adhesive remnant index between precoated and conventionally bonded orthodontic brackets

Numerous studies have made suggestions to overcome the problems associated with the clinical applicability of results from in vitro studies. Technical specifications, as described in ISO/TS 11405:2003, provide guidance for the selection of substrates and storage and handling con- ditions, as well as the essential characteristics of different test methods for quality testing. Therefore, the purpose of this study was to compare the SBS and adhesive remnant index (ARI) at the enamel-bonding interface between precoated and conventionally bonded brackets, utilizing standardized procedures, thereby facilitating comparisons among studies.
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Comparative Evaluation of Shear Bond Strength of Orthodontic Brackets on Pretreatment with CPPACP, Fluor Protector and Phosflur: An In-vitro Study

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BONDiNG PrOCEDurE: The buccal surface of the teeth were washed with distilled water and dried using oil and moisture free air from a three way syringe for 5 seconds. The enamel was then treated with 37% Orthophosphoric acid for 30 seconds, washed away with a spray of water for 10 seconds. The tooth surface was then air dried till a white chalky appearance was seen on the surface. The primer was applied with the help of an applicator brush. The adhesive was then applied to the base of the metal bracket. The bracket was then positioned on the tooth surface along the long axis of the tooth at a predetermined position from the occlusal surface with the help of a bracket positioning gauge. The adhesive was cured using a LED. The adhesive was cured from the mesial and distal aspects for 10 seconds each.
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Effect of Quaternary Ammonium Salt on Shear Bond Strength of Orthodontic Brackets to Enamel

Effect of Quaternary Ammonium Salt on Shear Bond Strength of Orthodontic Brackets to Enamel

Sixty sound first premolars extracted for orthodontic purposes with no caries, cracks or restorations were cleaned from soft tissue residues and immersed in 0.5% chloramine T solution at 4°C for seven days. The teeth were randomly divided into four groups of 15, rinsed and dried. Next, 32% phosphoric acid (Scotchbond Universal etchant; 3M ESPE, St. Paul, MN, USA) was used for etching of the enamel according to the manufacturer’s instructions. The teeth were etched for 15 seconds, rinsed and dried to obtain a chalky white appearance. The four types of primer were used for bracket bonding (control and 10%, 20% and 30% concentrations of QAS). Transbond XT composite (3M Unitek, Monrovia, CA, USA) was applied on standard stainless steel edgewise premolar bracket base (American Orthodontics, Sheboygan, USA) with 0.018-inch slot size according to the manufacturer’s instructions with 12.62 mm 2 bracket base area. Brackets were then
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In-Vitro Evaluation of the Effect of Herbal Antioxidants on Shear Bond Strength of Composite Resin to Bleached Enamel

In-Vitro Evaluation of the Effect of Herbal Antioxidants on Shear Bond Strength of Composite Resin to Bleached Enamel

Subramonian et al, [24] reported that herbal products such as pine bark and grape seed extract can compensate for the reduced bond strength of composite to bleached enamel, and pine bark had a greater efficacy than grape seed; the results of our study demonstrated similar antioxidative efficacy of green tea and grape seed, which was in agreement with the results of Sharafeddin et al [23]. However, sage was not evaluated in their study. The current study showed that sage had antioxidant activity and increased the microshear bond strength of composite to bleached enamel. The mechanism of action of sage has yet to be fully understood; however, the antioxidant property of this material is due to its polyphenolic nature and chemical formulation. Polyphenols like caffeic acid, hispidulin, apigenin, rosmanol, carnosic acid, carnosol and ursolic acid are among the active ingredients of sage. Similar to other antioxidants, these polyphenols inhibit the formation of reactive oxygen species [22,34]. This finding was in accord with the results of Khamverdi and Safari [22]. Abraham et al, [27] compared the antioxidant property of sodium ascorbate and grape seed and concluded that application of grape seed had greater efficacy for reversal of compromised bond strength of composite to bleached enamel; whereas, Arumugam et al, [28] reported opposite results. It is stated that high molecular weight of proanthocyanidin is an important factor responsible for its less penetration into tooth structure and reducing
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