Effect of Surface Treatment of Fiberglass Posts on Bond Strength to Root Dentin

Author:

Valdivia Andréa Dolores Correia Miranda1,Novais Veridiana Resende1,Menezes Murilo de Sousa1,Roscoe Marina Guimarães1,Estrela Carlos2,Soares Carlos José1

Affiliation:

1. UFU - Federal University of Uberlândia, Brazil

2. UFG - Federal University of Goiás, Brazil

Abstract

This study evaluated the influence of the surface treatments of fiberglass posts on bond strength to root dentin using push-out test. Forty bovine incisor roots were endodontically treated. The surface of the fiberglass posts (Exacto #2, Angelus) were treated using 4 different protocols (n=10): Control - 70% ethanol for 1 min; 37% phosphoric acid for 1 min; 10% hydrofluoric acid for 1 min; and 24% hydrogen peroxide for 1 min. After a silane coupling agent was applied for 1 min and all posts were cemented using self-adhesive resin cement (RelyX Unicem, 3M-ESPE). The roots were sectioned and two 1-mm-thick slices were obtained from each third: cervical, middle and apical. The specimens were subjected to the push-out test with a crosshead speed of 0.5 mm/min. Data were analyzed by repeated measures ANOVA followed by Tukey's HSD tests (=0.05). The surface treatment (p<0.001) and root third region (p=0.007) factors were significant. The retention to root canal was affected by surface treatment type. The post surface treatment with 24% hydrogen peroxide for 1 min yielded significantly higher bond strength when the fiberglass posts were cemented with RelyX Unicem.

Publisher

FapUNIFESP (SciELO)

Subject

General Dentistry

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