Manjunath Mandhira Doss, M R (2013) Comparative evaluation of reversal of shear bond strength on bleached enamel using antioxidants – sodium ascorbate, salicylic acid & N-acetyl cysteine: An in vitro study. Masters thesis, Tamilnadu Government Dental College and Hospital, Chennai.
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Abstract
AIM: The purpose of the study was to compare the effect of antioxidants [sodium ascorbate, salicylic acid and N- acetyl cysteine] on enamel-resin nanocomposite shear bond strength after bleaching with 30% carbamide peroxide. MATERIALS & METHODS: 60 labial enamel surfaces of maxillary central incisors were taken, divided into 6 groups (n=10). Group I(without bleaching, without antioxidants), Group II(without antioxidant, bleaching with 30% carbamide peroxide, composite bonding immediately), Group III(without antioxidant, bleaching with 30% carbamide peroxide,composite bonding after 7 days of storage in artificial saliva), Group IV(Bleaching with 30% carbamide peroxide followed by antioxidant sodium ascorbate application for 10 minutes, composite was built and cured immediately), Group V(Bleaching with 30% carbamide peroxide followed by antioxidant salicylic acid application for 10 minutes composite was built and cured immediately),Group VI(Bleaching with 30% carbamide peroxide followed by antioxidant N- acetyl cysteine application for 10 minutes composite was built and cured immediately) . All the teeth were subjected to shear bond testing. RESULTS: The shear bond strength data was analysed by ANOVA test and multiple comparisons by Post Hoc tests at a significance level of P < 0•05. The result of this study showed that for shear bond strength, group I (normal enamel) showed statistically significant difference when compared to group II (immediate bleaching) (p<0.05) and no statistically significant difference was seen with group III (bleaching after 7 days), group IV (sodium ascorbate), group V (salicylic acid) and group VI (Nacetyl cysteine) (p>0.05). CONCLUSION: 1 week delayed bonding procedure and 10% sodium ascorbate antioxidant after bleaching shows a good reversal of reduced bond strength which is nearly equal to control. Treatment of bleached enamel surface with salicylic acid and N-acetyl cysteine gives a good reversal of bond strength, but less when compared to Sodium ascorbate.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Bleaching, Antioxidants, Shear Bond Strength, Nano Composites. |
| Subjects: | DENTAL > Conservative Dentistry and Endodontics |
| Depositing User: | Subramani R |
| Date Deposited: | 05 Sep 2017 02:24 |
| Last Modified: | 12 Nov 2017 16:12 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/2919 |
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