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ORIGINAL ARTICLE
Year : 2019  |  Volume : 31  |  Issue : 2  |  Page : 150-157

Fracture resistance of teeth undergoing postendodontic bleaching: Comparison of four treatment modalities – An in vitro study


Department of Conservative Dentistry and Endodontics, PMS College of Dental Science and Research, Thiruvananthapuram, Kerala, India

Correspondence Address:
Dr. Abe Antony
PMS College of Dental Science and Research, Golden Hills, Vattapara, Venkode, Thiruvananthapuram - 695 028, Kerala
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/endo.endo_92_18

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Aims: The aims of the study were: (1) to evaluate the fracture resistance of endodontically treated teeth restored with microhybrid composite following combination bleaching and (2) to assess the antioxidizing effect of 10% sodium ascorbate hydrogel. Settings and Design: This was a randomized control trial in a tertiary care setting. Subjects and Methods: Endodontic treatment was performed on 40 freshly extracted human mandibular premolars. Following removal of gutta-percha 2 mm apical to cementoenamel junction and application of resin-modified glass ionomer as cervical barrier, all teeth were embedded in acrylic resin using cylindrical molds. Specimens were divided into five groups: Group 1 (n = 8): Specimens subjected to inside and outside bleaching using 10% hydrogen peroxide followed by composite restoration. Group 2 (n = 8): Specimens subjected to inside-outside bleaching with 10% hydrogen peroxide and sodium perborate followed by composite restoration; Group 3 (n = 8): Specimens subjected to conditioning with 10% sodium ascorbate after inside-outside bleaching using 10% hydrogen peroxide followed by composite restoration; Group 4 (n = 8): Specimens subjected to conditioning with 10% sodium ascorbate after inside-outside bleaching with 10% hydrogen peroxide and sodium perborate followed by composite restoration; and Group 5 (negative control) (n = 8): After endodontic treatment specimens were restored with composite. Finally, all the specimens were subjected to fracture resistance test using Universal Testing Machine. Statistical Analysis Used: ANOVA test followed by post hoc comparison of groups taken together by Tukey's analysis was performed. Results: Statistically significant difference in fracture resistance was present between Group 5 and Group 1 and also between Group 5 and Group 2. Unpaired t-test showed statistically significant difference between Group 1 and Group 3 and also between Group 2 and Group 4. Conclusion: The use of 10% sodium ascorbate antioxidant gel was effective in compensating for the decreased fracture resistance following combination bleaching.


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