Effect of different adhesive systems and laser treatment on shear bond stress of bleached enamel
ABSTRACT This study determined the shear bond strength of a nanohybrid composite resin to bleached enamel immediately or 15 days later using different adhesive systems and laser application.
One hundred and forty enamel specimens were prepared from human molar teeth and bleached either with 16% carbamide peroxide (CP) or 30% CP according to the manufacturer's (Vivastyle/Vivadent) recommendations. After bleaching treatments specimens were divided into two groups according to the treatment time of the adhesive procedures: immediately or 15 days after the bleaching treatments. The four groups were then divided into five subgroups due to the surface treatments: using a two-step self-etching adhesive (AdheSe, Ivoclar Vivadent G, Schaan, Liechtenstein) or a two-step etch and rinse adhesive (Excite, Ivoclar Vivadent G, Schaan, Liechtenstein) and application of laser prior to adhesive procedures or not. After adhesive procedures nanohybrid composite resin cylinders of 4 mm x 2 mm (Tetric Evo Ceram/Vivadent) were bonded to the enamel surfaces. All specimens were subjected to shear bond strength test after thermocycling and 24h of storage in water. Data were analyzed statistically.
Mann-Whitney U-test analysis showed no significant difference in the mean bond strength values of enamel bleached with either 16% CP or 30% CP (p>0.05). There was no difference between the groups bonded immediately or 15 days after bleaching (p>0.05). Application of the etch and rinse adhesive after 15 days showed the highest bond strength values, whereas self-etching adhesive and laser application showed the lowest values in both bleaching treatments.
The results suggested that following the bleaching treatments, the use of etch and rinse adhesive system may provide higher bond strengths than self-etching adhesive and laser application.
- SourceAvailable from: Mutlu Özcan
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- "Previous studies have compared bond quality between etch-and-rinse and selfetch adhesives subsequent to bleaching    . Some of them have advocated the use of etch-andrinse adhesives over self-etching ones subsequent to bleaching  ; there is little knowledge about the effect of post-restorative bleaching on adhesive systems. "
ABSTRACT: Abstract Objective. The main objective of this study was to evaluate the effects of an at-home and two in-office (chemically activated and KTP laser-activated) bleaching methods on the microleakage of composite resin restorations bonded with etch-and-rinse and self-etch adhesive systems. Materials and methods. Class V cavity preparations were performed on 96 premolars and teeth were divided into two groups according to the two adhesive systems (etch-and-rinse and self-etch). After cavities were restored with an adhesive systems and composite resin, they were submitted to thermocycling procedures. Teeth were divided into four sub-groups according to the bleaching systems (control, at-home bleaching, chemically activated office bleaching and KTP laser-activated office bleaching). After the bleaching procedure, teeth were evaluated for marginal leakage. All data were analyzed using the Mann-Whitney U and Kruskal-Wallis tests (p < 0.05). Results. The results of the present study showed that the control group presented lower microleakage values compared with the groups treated with bleaching agents, except for the chemically activated in-office bleaching. When the scores of microleakage at the enamel and gingival margins of the four groups were compared, the differences among the groups were found to be statistically significant (p < 0.05). Comparing the gingival and enamel margins in each group, statistically significant differences were found in the at-home group (p < 0.05) and no significant differences were seen in the other groups (p > 0.05). No significant difference was found between the adhesive systems after treatment with the same bleaching techniques. Conclusion. Under the conditions of this study, microleakage of composite resin restorations differs according to the bleaching methods used and no difference was found between the adhesive systems.Acta odontologica Scandinavica 01/2013; 71(3-4). DOI:10.3109/00016357.2012.741703 · 1.31 Impact Factor
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ABSTRACT: ARAŞ TIRMA ÖZET Bu çalışmanın amacı diyot lazerle aktive edilmiş hidrojen peroksid içerikli beyazlatma uygulamasını takiben siloran ve dimetakrilat bazlı kompozit rezin ve "self-etch", "total-etch" adezivleri içeren farklı restoratif materyallerin mi-neye makaslama bağlanma dayanımı kuvvetlerinin değerlendirilmesidir. Bu amaçla çekilmiş dişlerin düzleştirilmiş labiyal mine yüzeylerine %38 hidrojen peroksid içeren jel uygulanmış ve diyot lazer ile aktive edilmiştir. Restoratif materyaller, beyazlatma işleminden sonra üç haftalık bekleme süresini taki-ben mine yüzeylerine uygulanmış ve makaslama bağlanma dayanımı testi gerçekleştirilmiştir. Yapılan istatistiksel incelemeler, beyazlatma sonrası uy-gulanan restoratif sistemlerin makaslama bağlanma dayanımı değerlerinde anlamlı farklılıklar olduğunu göstermiştir. Aktive edilmiş hidrojen peroksid uygulanan mine yüzeylerindeki yapısal değişikliklerin ileri çalışmalarla ince-lenmesi yararlı olacaktır. Beyazlatma işlemleri sonrasında siloran ve dime-takrilat bazlı kompozit restoratif sistemlerin tek basamaklı "total-etch" ve iki basamaklı "self-etch" adezivleriyle birlikte kullanılmasının, dimetakrilat bazlı kompozit rezin ve tek basamaklı ("all-in-one") "self-etch" adeziv kombinas-yonuna göre daha uygun olacağı düşünülmüştür. Anahtar kelimeler: Bağlayıcı ajan, beyazlatma, dimetakrilat, siloran SUMMARY Evaluation of shear bond strength values of various restorative materials applied after diode laser activated bleaching The aim of this study was to evaluate enamel bond strength of various restorative systems containing silorane or dimethacrylate-based compos-ite resins and self-etch and total-etch adhesives after hydrogen peroxide bleaching, activated by a diode laser. For this purpose a 38% hydrogen peroxide gel was applied onto sound flattened labial enamel surfaces and activated by diode laser. Restorative systems were applied onto power bleached enamel surfaces after a waiting period of three weeks, and shear bond adhesion test was performed. Statistical analysis showed signifi-cant influence of the variable, different restorative systems on shear bond strength to enamel. The data suggest that application of different restorative systems may provide various shear bond strengths to enamel after power bleaching. Further studies examining the structural changes of activated hydrogen peroxide treated enamel are needed. Application of silorane and dimethacrylate-based composite restorative systems containing two-step self-etch or one-step total-etch adhesives may be more convenient rather than the application of dimethacrylate-based composite restorative sys-tems containing all-in-one self-etch adhesives after power bleaching.
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ABSTRACT: This study evaluated the effect of bleaching gel containing 10%, 15% and 20% carbamide peroxide (CP) on the bond strength of dental enamel or dentin and resin composite restorations. The buccal surfaces of 12 bovine tooth crowns were conditioned with 37% phosphoric acid, and the adhesive resin Single Bond 2 and the resin composite Filtek Z350 were used to perform the restorations. The blocks were sectioned to obtain bar specimens. Each specimen group (enamel-E, dentin-D) was divided into four subgroups (n=15): S-artificial saliva; 10-10% CP bleaching; 15-15% CP bleaching; 20-20% CP bleaching. CP was applied for six hours daily for two weeks. The specimens were submitted to the sigma test in a universal testing machine. The data were analyzed by one-way ANOVA and the Tukey post-hoc test and a correlation analysis (r) was performed. For Group E, the mean value (+/- standard-deviation) was 21.86 (+/- 6.03)a, 18.91 (+/- 8.31)ab, 15.43 (+/- 7.44)b and 10.6 (+/- 4.94)c for ES, E10, E15 and E20, respectively. For Group D, the a values were 34.73 (+/- 4.68)a, 35.12 (+/- 13.43)a, 29.67 (+/- 6.84)ab and 24.56 (+/- 6.54)b for DS, D10, D15 and D20, respectively. A negative correlation between the CP concentration and mean values was observed for both the enamel (r=-0.95) and dentin (r=-0.85) groups. In the current study, the bond strength of the restoration to enamel and the restoration to dentin were influenced by the application of CP and was dependent on the CP concentration in the bleaching gel.Operative Dentistry 07/2010; 35(4):463-9. DOI:10.2341/09-242-L · 1.27 Impact Factor