Effect of self-etching primer/adhesive and conventional bonding on the shear bond strength in metallic and ceramic brackets

Abstract

Introduction: Bracket debonding from the tooth surface is a common problem in fixed orthodontics. The aims of the present study were to assess the bond strength and failure sites in two ways of bonding technique, with metallic and ceramic brackets. Material and Methods: One hundred premolars were assigned to 4 groups of 25 each: Group A, metallic brackets/ conventional procedure; Group B, metallic brackets/Transbond XT; Group C, ceramic brackets/conventional procedure; and Group D, ceramic brackets/Transbond XT. Transbond XT composite paste was used for bracket bonding and cured by conventional light-cure device. Specimens were subjected to thermocycling. One week after bonding shearing force was applied to the bracket-tooth interface. Bonding failure site optically examined using a stereomicroscope under 10 × magnifications and scoring was done using the adhesive remnant index (ARI). Data were subjected to analysis of One-way variance, Tukey post hoc, Chi-square and Spearman’s tests. Results: Mean bond strength (in MPa) were: group A=9.2, group B=8.5, group C=6.2 and group D=5.7. Bond strength differences between groups A and B, and between C and D were not significant, (p<0.0005). Insignificant difference found in ARI in all groups. Conclusion: The bond strengths of metallic brackets were significantly higher than ceramic ones and the selfetching primer produce fewer bonds than the conventional method (clinically acceptable). A positive correlation found between changes in shearing bond strength and ARI. Key words: Acid etching, adhesive remnant index, orthodontic brackets, self-etching primer, shearing bond strength.

Comparison of shear bond strength and bonding time of a novel flash-free bonding system

“…The mean ARI scores for the manual and APC PLUS groups were similar to those reported by Mirzakouchaki et al, 13 with 67% (16/24) of bracket failures occurring at the adhesive-bracket interface. All of the bracket failures in the APC Flash-Free group occurred within the adhesive and had an average ARI that was significantly greater than that of the other two groups.…”

Comparative study of dental enamel loss after debonding braces by analytical scanning electron microscopy (SEM)

“…Shear bond strength in metal brackets is significantly higher than in ceramic brackets and using the etching technique with Transbond Plus SEP because it produces clinically less detachment than the conventionally accepted method (Mirzakouchaki, Kimyai, Hyari, Shahrbaf, & Mirsakouchaki‐Boroujeni, ).…”

Bond strength of different bracket bonding materials to the enamel subjected to thermal cycling

“…In this study, the samples were submitted to 1000, 2000 and 3000 thermal cycles, with immersion temperatures between 5° C and 55° C, 15-second dips and a 5-second interval between immersions, in order to allow comparisons with other studies that used similar conditions 7,12,[14][15]17 . In addition, the simulated aging corresponded to less than a year, since 10,000 (ten thousand) cycles would be needed to simulate one year of aging 19 , which poses great difficulties in terms of laboratory testing, since this would require months to be achieved.…”

“…Although several studies have evaluated the bond strength of brackets bonded to enamel immediately or within the first few hours or weeks after bonding to enamel 1,5,[11][12] , there are only a few studies 7,[13][14][15] that have investigated the effect of bonding material aging in terms of the number of thermal cycles on the bond strength and fracture mode, thus suggesting the need for further studies on this matter. Therefore, the objective of this study was to evaluate in vitro the effect of the number of thermal cycles on the shear bond strength and fracture mode of metallic orthodontic brackets bonded to enamel using either a composite resin or a resin-modified glass ionomer bonding system.…”