Bond strength and internal adaptation of customized glass fiber posts using different bulk-fill flow resins

Abstract

Background: This study aimed to evaluate the bond strength and internal adaptation of customized glass fiber posts using Bulk Fill flowable composite resins (BF) and conventional composite resin.

Material and methods: Fifty bovine teeth were randomly divided (n=10) according to the following groups: G1 (control): glass fiber posts were adapted to the root canal and luted with Rely-X ARC cement (3M® ESPE); G2: fiber posts smaller than the root canal diameter were customized using Filtek™ Z350 XT (3M® ESPE) conventional composite resin, and luted similarly to Group 1. G3: posts were customized with Tetric N-Ceram Bulk Fill composite resin (Ivoclar Vivadent AG), G4: posts were customized with Filtek™ Bulk Fill Flow (3M® ESPE), and G5: posts were customized with SureFil SDRTM flow (DENTSPLY), respectively. The specimens were submitted to push-out testing and internal adaptation evaluation using optical microscopy. Push-out (MPa) and internal adaptation (%) data were subjected to ANOVA and Tukey's post-hoc tests (p = 5%).

Results: No statistically significant differences were found in both evaluations (p<0.05).

Conclusions: Customized glass fiber posts using different bulk fill flowable composites did not affect the post bond-strength and internal adaptation, presenting similar results to customized glass fiber posts using conventional composite or posts with no previous customization. Key words:Dental pulp, composite resins, fiber posts, glass fiber post.

Figure 1

(A) - 4mm of obturator material was left in the apical region of the root canal; (B) - After applying the Bulk-fill flow resin, a millimeter probe was used to check the 4 mm height increment; (C) - The fiberglass post was inserted and cured for 20 sec; (D) - The second 4mm increment was applied and light cured for 20 sec; (E) - The third 4mm increment was applied and cured for 20 sec.