Immediate and long-term microshear bond strength of resin-based cements to core build-up materials

Fernanda C Lacerda; Waldemir F Vieira-Junior; Paulo E de Lacerda; Cecília P Turssi; Roberta T Basting; Flávia L do Amaral; Fabiana Mg França

doi:10.4317/jced.58515

Immediate and long-term microshear bond strength of resin-based cements to core build-up materials

J Clin Exp Dent. 2021 Oct 1;13(10):e1030-e1037. doi: 10.4317/jced.58515. eCollection 2021 Oct.

Authors

Fernanda C Lacerda¹, Waldemir F Vieira-Junior¹, Paulo E de Lacerda¹, Cecília P Turssi¹, Roberta T Basting¹, Flávia L do Amaral¹, Fabiana Mg França¹

Affiliation

¹ DDS, MSc, PhD. Faculdade São Leopoldo Mandic, Instituto de Pesquisas São Leopoldo Mandic, Campinas/SP, Brazil.

Abstract

Background: To evaluate the microshear bond strength (μ-SBS) between resin-based cements and core build-up materials after water storage.

Material and methods: Cylinders (1x1 mm) of conventional dual-cure resin cement (RelyX ARC, 3M ESPE), universal dual-cure resin cement (RelyX Ultimate, 3M ESPE) or self-adhesive resin cement (RelyX U200, 3M ESPE) were adhered to disks (6x2 mm) made with commercial core build-up materials (Bis-Core, Bisco or LuxaCore Z, DMG) or conventional nanocomposite resin (Filtek Z350 XT, 3M ESPE). The specimens (n=10) were submitted to μ-SBS test using a universal testing machine and fracture pattern analysis at 48 hours or after 9 months of water storage. The data were evaluated by three-way ANOVA for repeated measures and Tukey's test (α=0.05).

Results: After 48 hours, regardless of the resin-based cement used, the μ-SBS to the conventional resin composite (Filtek Z350 XT) was greater compared to other materials. However, after 9 months, there was a statistically significant decrease in μ-SBS values between the conventional resin composite and evaluated luting agents. The μ-SBS values of core build-up commercial materials (Bis-Core and LuxaCore Z) did not change over time. Regardless of the composite used and storage time, there was no statistically significant difference between the resin-based cements. After 48 h, the most prevalent failure was mixed for all groups. However, after 9 months, the core build-up materials showed a predominantly mixed fracture pattern whereas the resin composite presented an adhesive pattern.

Conclusions: Commercial core build-up materials achieved stable bonding performance with resin-based cements over time. Key words:Composite resins, resin cement, dental restoration failure.