Effect of different root dentin pretreatment protocols on the bond strength of fiber posts cemented with core buildup material

Rowaida Naeem,Maged Zohdy,Tarek Salah

doi:10.14295/bds.2019.v22i1.1620

Abstract

Objective: The purpose of the study was to evaluate the push out bond strength of fiber posts -after cementaion with core build up material and dentin pretreatment using different adhesive protocols- in different root regions. Material and Methods: 28 endodonticaly treated human premolars were divided into 4 groups. The post spaces were treated with 1 of 4 different dentin bonding protocols: total etch light cured adhesive, solobond m; total etch dual cured adhesive, Excite f DSC; self-etching light cured adhesive, single bond universal; or self-etching dual cured adhesive, futura bond dc. Fiber posts, were luted with dual cured core material. The roots were cut into 2-mm-thick sections, in cervical, middle, and apical regions. Push-out tests were performed with a universal testing machine, and bond strength values (MPa) were calculated. Data were analyzed with 1- and 2-way analysis of variance and Tukey multiple comparison tests (a=.05). Failure modes were examined under stereo microscope. Results: The highest mean bond strength values were obtained for self-etch dual cured adhesive, (9.69 MPa). The Total etch light cured adhesive (2.81 MPa) showed the lowest bond strength. Self-etch light-polymerized and total etch dual-polymerized adhesives provided similar bond strengths (5.37, 5.72 respectively). The regional bond strength values were reduced significantly in apical post space (P<0.01). The most predominant failure type was mixed failure followed by adhesive failure. Conclusion: Dentin pretreatment using self-etch dual cured adhesives prior to fiber posts cementation offers a high bond strength. While using total-etch light cured adhesives is not recommended due to the low bonding quality. KeywordsDentin; Bond strength; Fiber posts; Core buildup material; Adhesive protocols; Pretreatment.

Highlights

V arious luting agents and corresponding adhesive systems have been proposed for bonding fiber posts to root canal dentin
Dual-cure resin composite core materials have been introduced for the placement of fiber posts in post spaces because a resin composite has a modulus of elasticity close to that of dentin and fiber posts, and better mechanical properties than those of a resin cement [2]
Further analysis with the Tukey post-hoc test revealed that self-etch dual cured (DS) adhesives showed the highest mean bond strength, followed by the total etch dual cured and self-etch light cured which showed non-significant difference while the total etch light cured adhesive showed the lowest mean push out bond strength as shown in table 1

Summary

Introduction

V arious luting agents and corresponding adhesive systems have been proposed for bonding fiber posts to root canal dentin These materials can be light polymerized or dual cured. In addition current developments tend to adhesively restore the weakened endodontically treated teeth with fiber post and composite core in a one-stage core-and-post procedure [4], whereas core build-up will immediately follow post cementation using the same composite material (core-and-post materials). Such a procedure could reduce the technique sensitivity, hazards of possible incompatibility of different composites (interface between cement and core material) and the time necessary to complete the core-and-post treatment procedure [4]

Methods

Results

Conclusion