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KMID : 1034420230480030030
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Restorative Dentistry & Endodontics
2023 Volume.48 No. 3 p.30 ~ p.30
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Comparison between a bulk-fill resin-based composite and three luting materials on the cementation of fiberglass-reinforced posts
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Carlos Alberto Kenji Shimokawa
Paula Mendes Acatauassu Carneiro
Tamile Rocha da Silva Lobo
Roberto Ruggiero Braga
Sachini N.K. Kodithuwakku Arachchige
Adriana Bona Matos
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Abstract
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Objectives : This 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 Methods : Sixty 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).
Results : BF 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).
Conclusions : The 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.
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KEYWORD
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Bond strength, Hardness tests, Resin-based cement, Resin-based composite
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