Effective application duration of sodium ascorbate antioxidant in reducing microleakage of bonded composite restoration in intracoronally-bleached teeth
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Objectives: The aim of this study was to determine an appropriate application duration of sodium ascorbate (SA) antioxidant gel in reducing microleakage of bonded composite restoration in intracoronally-bleached teeth. Materials and Methods:Eighty endodontically-treated human incisors were randomly divided into eight groups:control, no bleaching; IB and DB, immediate and delayed bonding after bleaching,respectively; S10m, S60m, S24h, S3d and S7d, bleaching + SA gel for 10 min, 60min, 24 hr, 3 day and 7 day, respectively. For bleaching, a mixture of 30% hydrogen peroxide and sodium perborate was applied for 7 day. All access cavities were restored using One-Step adhesive (Bisco Inc.) and then Aelite LS Packable composite (Bisco Inc.). The bonded specimens were subjected to 500 thermal cycles, immersed in 1%methylene blue for 8 hr, and longitudinally sectioned. Microleakage was assessed with a 0 – 4 scoring system and analyzed using nonparametric statistical methods (α =0.05). Results: Group IB showed a significantly higher microleakge than the control group (p = 0.006) and group DB a statistically similar score to the control group (p >0.999). Although groups S10m, S60m, and S24h exhibited significantly higher scores than group DB (p < 0.05), the microleakage in groups S3d and S7d was statistically similar to that in group DB (p = 0.771, p > 0.999). Conclusions: Application of SA gel for 3 day after nonvital bleaching was effective in reducing microleakage of composite restoration in intracoronally-bleached teeth. (Restor Dent Endod 2013;38(1):43-47)
Abstract
Objectives: The aim of this study was to determine an appropriate application duration of sodium ascorbate (SA) antioxidant gel in reducing microleakage of bonded composite restoration in intracoronally-bleached teeth. Materials and Methods:Eighty endodontically-treated human incisors were randomly divided into eight groups:control, no bleaching; IB and DB, immediate and delayed bonding after bleaching,respectively; S10m, S60m, S24h, S3d and S7d, bleaching + SA gel for 10 min, 60min, 24 hr, 3 day and 7 day, respectively. For bleaching, a mixture of 30% hydrogen peroxide and sodium perborate was applied for 7 day. All access cavities were restored using One-Step adhesive (Bisco Inc.) and then Aelite LS Packable composite (Bisco Inc.). The bonded specimens were subjected to 500 thermal cycles, immersed in 1%methylene blue for 8 hr, and longitudinally sectioned. Microleakage was assessed with a 0 – 4 scoring system and analyzed using nonparametric statistical methods (α =0.05). Results: Group IB showed a significantly higher microleakge than the control group (p = 0.006) and group DB a statistically similar score to the control group (p >0.999). Although groups S10m, S60m, and S24h exhibited significantly higher scores than group DB (p < 0.05), the microleakage in groups S3d and S7d was statistically similar to that in group DB (p = 0.771, p > 0.999). Conclusions: Application of SA gel for 3 day after nonvital bleaching was effective in reducing microleakage of composite restoration in intracoronally-bleached teeth. (Restor Dent Endod 2013;38(1):43-47)
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