The effect of individualization of fiberglass posts using bulk-fill resin-based composites on cementation: an in vitro study

Rodrigo Barros Esteves Lins; Jairo Matozinho Cordeiro; Carolina Perez Rangel; Thiago Bessa Marconato Antunes; Luís Roberto Marcondes Martins

doi:10.5395/rde.2019.44.e37

The effect of individualization of fiberglass posts using bulk-fill resin-based composites on cementation: an in vitro study

Restor Dent Endod. 2019 Oct 18;44(4):e37. doi: 10.5395/rde.2019.44.e37. eCollection 2019 Nov.

Authors

Rodrigo Barros Esteves Lins¹, Jairo Matozinho Cordeiro², Carolina Perez Rangel¹, Thiago Bessa Marconato Antunes¹, Luís Roberto Marcondes Martins¹

Affiliations

¹ Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
² Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.

Abstract

Objectives: This study evaluated the bond strength of various fiberglass post cementation techniques using different resin-based composites.

Materials and methods: The roots from a total of 100 bovine incisors were randomly assigned to 5 treatment groups: G1, post + Scotchbond Multi-Purpose (SBMP) + RelyX ARC luting agent; G2, relined post (Filtek Z250) + SBMP + RelyX ARC; G3, individualized post (Filtek Z250) + SBMP; G4, individualized post (Filtek Bulk-Fill) + SBMP; G5, individualized post (Filtek Bulk-Fill Flow) + SBMP. The samples were subjected to the push-out (n = 10) and pull-out (n = 10) bond strength tests. Data from the push-out bond strength test were analyzed using 2-way analysis of variance (ANOVA) with the Bonferroni post hoc test, and data from the pull-out bond strength test were analyzed using 1-way ANOVA.

Results: The data for push-out bond strength presented higher values for G2 and G5, mainly in the cervical and middle thirds, and the data from the apical third showed a lower mean push-out bond strength in all groups. No significant difference was noted for pull-out bond strength among all groups. The most frequent failure modes observed were adhesive failure between dentine and resin and mixed failure.

Conclusions: Fiberglass post cementation using restorative and flowable bulk-fill composites with the individualization technique may be a promising alternative to existing methods of post cementation.

Keywords: Cementation; Composite resins; Dentin; Root canal filling materials; Tooth root.