Influence of Two Antioxidants on Microleakage of Filling Resin after Intracoronal Bleaching

doi:10.13701/j.cnki.kqyxyj.2023.08.013

Abstract

Abstract: Objective: To compare the influence of 10% SA gel with a surfactant (0.2%Tween 80) and 6.5% PC gel on the microleakage of filling resin after intracoronal bleaching and determine the best treating time. Methods: One hundred and twenty premolars extracted in the past one month were collected and randomly divided into ten groups (n=12). Group A: unbleached group, Group B: bleached group, Group C: 10% SA gel with 0.2% Tween 80, Group D: 6.5% PC gel. After intracoronal bleaching,each experimental group was divided into 4 subgroups(C1/C2/C3/C4 and D1/D2/D3/D4) according to the treating time of antioxidant (10 min, 30 min, 60 min, and 120 min). Then the cavity was filled with composite resin. After 500 thermal cycles, 10 randomly selected samples in each group were put into 2% methylene blue for 24 hours. The microleakage of filled resin was observed at buccolingual under stereomicroscope. The measured data was analyzed with statistical methods. The micromorphology of the bonding interface in the remaining samples was observed with scanning electron microscope(SEM). Results: Group A showed a significantly lower microleakage compared to group B (P=0.000). There were statistical differences between the experimental groups and group B,the microleakage of the filled resin was gradually decreased, and the lowest value was group D3. There was apparent significance between C1 and D1, C2 and D2, C3 and D3 (P<0.05), except for C4 and D4 (P=0.089). Group B demonstrated the most obvious and largest gap between filling resin and dental tissues observed by SEM. The gap at the bonding interface was gradually narrowed in group C, and disappeared in group C4. The filling resin was well united with dental tissue,and the adhesion belt was well formed in group D. Conclusion: 6.5% PC gel has a better effect on the microleakage of filling resin after internal bleaching of dead pulp teeth. It is suggested that the best treatment time is 60 minutes.

Key words: sodium ascorbate gel, proanthocyanidins gel, intracoronal bleaching, microleakage

ZHANG Xiaoping, CHANG Yue. Influence of Two Antioxidants on Microleakage of Filling Resin after Intracoronal Bleaching[J]. Journal of Oral Science Research, 2023, 39(8): 732-737.

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