Effect of Different Root Canal Obturating Materials on Push-Out Bond Strength of a Fiber Dowel

• Published in: Journal of prosthodontics 2012-07, Vol.21 (5), p.389-392
• Main Authors: Aggarwal, Vivek, Singla, Mamta, Miglani, Sanjay, Kohli, Sarita
• Format: Article
• Language: English
• Subjects: Dental Bonding; Dental Prosthesis Design; Dental Pulp Cavity - anatomy & histology; Dental Stress Analysis - instrumentation; Dentistry; Dimethylpolysiloxanes - chemistry; Drug Combinations; Epoxy Resins - chemistry; Fiber dowel; Gutta-Percha - chemistry; Guttaflow; Humans; Humidity; Materials Testing; obturation; Post and Core Technique - instrumentation; push-out bond strength; Resilon; Resin Cements - chemistry; Root Canal Filling Materials - chemistry; Root Canal Obturation - methods; Root Canal Preparation - instrumentation; Root Canal Preparation - methods; Self-Curing of Dental Resins; Stress, Mechanical; Temperature; Time Factors; Zinc Oxide-Eugenol Cement - chemistry
• ISSN: 1059-941X; 1532-849X
• DOI: 10.1111/j.1532-849X.2012.00850.x

Purpose: During dowel space preparation, the instrumentation forms a thick smear layer along with sealer‐occluded dentinal tubules. The purpose of this study was to evaluate the effect of different obturating materials on push‐out bond strength of a fiber dowel. Materials and Methods: Fifty human uniradicular teeth were decoronated and prepared using the step‐back technique. The specimens were divided into five groups on the basis of obturating materials: group I received no obturation; group II (ZOE) gutta‐percha and zinc oxide eugenol sealer; group III (ZOAH) gutta‐percha and AH plus sealer; group IV (GF) GuttaFlow; and group V (RE) with Resilon Epiphany system. Dowel spaces were made with manufacturer's provided drills, and a fiber dowel was luted. Horizontal slices were obtained from the middle third, and push‐out bond strength (S) was evaluated. Statistical analysis was carried out using one‐way ANOVA and post hoc Tukey's test. Results: The push‐out bond strength values in the control group, ZOE, ZOAH, GF, and RE were 9.303 ± 0.565 MPa, 8.859 ± 0.539 MPa, 8.356 ± 0.618 MPa, 9.635 ± 0.435 MPa, and 8.572 ± 0.256 MPa, respectively. There was no statistically significant difference between the S values of all the groups (p > 0.05). Conclusion: There was no effect of different tested obturating materials on the push‐out bond strength of fiber dowels; however, further studies should be conducted.