Comparison between a bulk-fill resin-based composite and three luting materials on the cementation of fiberglass-reinforced posts

• Published in: Restorative dentistry & endodontics 2023-08, Vol.48 (3), p.e30-e30
• Main Authors: Shimokawa, Carlos Alberto Kenji, Carneiro, Paula Mendes Acatauassú, Lobo, Tamile Rocha da Silva, Braga, Roberto Ruggiero, Turbino, Míriam Lacalle, Matos, Adriana Bona
• Format: Article
• Language: English
• ISSN: 2234-7658; 2234-7666
• DOI: 10.5395/rde.2023.48.e30

ObjectivesThis study verified the possibility of cementing fiberglass-reinforced posts using a flowable bulk-fill composite (BF), comparing its push-out bond strength and microhardness with these properties of 3 luting materials. Materials and MethodsSixty endodontically treated bovine roots were used. Posts were cemented using conventional dual-cured cement (CC); self-adhesive cement (SA); dual-cured composite (RC); and BF. Push-out bond strength (n = 10) and microhardness (n = 5) tests were performed after 1 week and 4 months of storage. Two-way repeated measures analysis of variance (ANOVA), 1-way ANOVA, t-test, and Tukey post-hoc tests were applied for the push-out bond strength and microhardness results; and Pearson correlation test was applied to verify the correlation between push-out bond strength and microhardness results (α = 0.05). ResultsBF presented higher push-out bond strength than CC and SA in the cervical third before aging (p < 0.01). No differences were found between push-out bond strength before and after aging for all the luting materials (p = 0.84). Regarding hardness, only SA presented higher values measured before than after aging (p < 0.01). RC and BF did not present 80% of the maximum hardness at the apical regions. A strong positive correlation was found between the luting materials' push-out bond strength and microhardness (p < 0.01, R2 = 0.7912). ConclusionsThe BF presented comparable or higher push-out bond strength and microhardness than the luting materials, which indicates that it could be used for cementing resin posts in situations where adequate light curing is possible.