Effect of cementation protocol on push-out bond strength of fiber posts to root canal

Denise S Casselli,André L Faria-E-Silva,Murilo S Menezes,Marcela G Borges

doi:10.1186/2196-4351-2-15

Abstract

Abstract The aim of this study was to evaluate the effect of adhesive protocol on the retention of glass-fiber posts luted into root canals. Thirty bovine incisors were endodontically treated and 9-mm-deep post holes were prepared. Fiber posts were luted using one of following protocols (n = 10): SB – Single Bond (3 M ESPE) with regular resin cement RelyX ARC (3 M ESPE); SBMP – Scotchbond Multipurpose Plus (3 M ESPE) associated with RelyX ARC; or UNI – the self-adhesive resin cement RelyX Unicem (3 M ESPE). After cementation, root/post specimens were transversally sectioned into 1-mm-thick slices, which were submitted to push-out testing in a mechanical testing machine. Bond strength data were analyzed by ANOVA (α = 0.05). There was no statistical difference between the adhesive protocols evaluated. Considering that the adhesive protocols evaluated showed similar bond strength values, simpler protocols must be preferable to lute fiber posts to root canal.

Highlights

Several clinical trials have demonstrated a high success rate of glass-fiber post-retained restorations [1,2,3]
Cementation of the fiber post to root canals was performed with resin cements associated with adhesive systems
There was no significant difference between any adhesive protocols evaluated, while the null hypothesis tested was accepted

Summary

Introduction

Several clinical trials have demonstrated a high success rate of glass-fiber post-retained restorations [1,2,3]. The favorable failures and low incidence of root fracture are related mainly to similar elastic modulus properties between fiber posts and dentin [4]. Despite these advantages, proper luting procedures of fiber posts are essential to the longevity of the restoration. In addition to the loss of post retention, debonding of the fiber post to root canal dentin increases the risk of post/core fracture [5]. Cementation of the fiber post to root canals was performed with resin cements associated with adhesive systems. Bonding procedures to root canals is complex, impairing successful proper adhesion [6]. Possible incompatibility between the adhesive system and the resin cement can occur and can compromise the luting procedure [7]

Objectives

Methods

Results