Influence of the Cement Film Thickness on the Push-Out Bond Strength of Glass Fiber Posts Cemented in Human Root Canals.

Natália Araújo Silva Prado,Sidnei Paciornik,Mauro Sayão De Miranda,Reinaldo De Souza Ferreira,Marcos Henrique De Pinho Maurício

doi:10.1155/2016/9319534

Abstract

The present study evaluated the influence of the cement film thickness on the push-out bond strength of glass fiber posts in the cervical, medium, and apical thirds of root canal spaces. Thirty roots were randomly divided into three groups, according to the fiber post system's drills: (G1) #2; (G2) #3; (G3) #4. The posts were cemented using a self-adhesive cement, and a small amount of powdered Rhodamine B was used as a stain. Images of both sides of each slice were obtained before and after the push-out test. To determine the cement thickness, a macro routine was developed using the software KS 400. The data were analyzed statistically using Kruskal-Wallis and Dunn's test. G2 (14.62 ± 5.15 MPa) showed statistically higher bond strength values than G1 (10.04 ± 5.13 MPa) and G3 (7.68 ± 6.14 MPa). All groups presented higher bond strength values in the apical third. The bur diameter significantly influenced the results of the shear bond strength for the push-out test. The slight increase in the cement thickness allowed an increase in the values of shear bond strength when compared to very thin or very thick cement films.

Highlights

IntroductionFiber reinforced posts are widely used to restore endodontically treated teeth [1]
Fiber reinforced posts are widely used to restore endodontically treated teeth [1]. They are usually luted with resin cements, which promote an increase in retention when compared to conventional cements, such as zinc phosphate [2, 3]
To simplify the cementation technique, self-adhesive resin cements were developed. These cements are dual-curing, with the characteristic of selfadhesion to the tooth structure, which eliminates the need of adhesive systems [5]

Summary

Introduction

Fiber reinforced posts are widely used to restore endodontically treated teeth [1] They are usually luted with resin cements, which promote an increase in retention when compared to conventional cements, such as zinc phosphate [2, 3]. This technique is very sensitive and the manufacturers protocol must be carefully followed in order to achieve successful restorations [4]. Studies have been developed to evaluate the influence of adhesive systems, resin cements, and curing modes on the retention of fiber posts [6,7,8]. There have been few studies on the cement film thickness and its influence on the bond strength of these posts

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Discussion

Conclusion