The Effect of Canal Etching on the Tensile Bond Strength of Casting Posts Cemented with Xeno Cement

Zahra Mirzaei ¹, Ali Hafezqoran ², Ehsan Khashabi ¹ and Roodabeh Koodaryan ³*

¹Dental and Periodontal Research Center, Faculty of Dentistry, University of Medical Sciences, Urmia, Iran.

²Dental and Periodontal Research Center, Faculty of Dentistry, University of Medical Sciences, Tabriz, Iran.

³Department of Prosthodontics, Faculty of Dentistry, University of Medical Sciences, Tabriz, Iran.

Corresponding Author E-mail: koodaryan@gmail.com

DOI : http://dx.doi.org/10.13005/bbra/2399

ABSTRACT: The longevity of casting posts cemented to root canal is directly related to the bonding quality of resin cements to dental tissues. Surface treatment has an important role in optimizing bonding strength.  The purpose of this study was to examine the effect of acid etching on the tensile bond strength of casting posts cemented with self-etch resin cement. The crowns of 32 canine teeth were cut from CEJ region. After root canal therapy and preparation for receiving casting posts, Duraley impressions were made and cast. Teeth were randomly divided into two groups. Root canals of test specimen were etched with 37% phosphoric acid for 10 seconds and for the control group, saline solution was used instead. After cementation with Xeno resin cemet, tensile bond strength was measured using universal testing machine. Data were analyzed using independent t-test method (α=5%). Mean ± SD tensile bond strength of casting posts in test and control groups were 105.8 ±20.5 and 55.6 ±21.2 respectively. Etching with 37% phosphoric acid produced significantly higher tensile bond strength in cemented posts (P<0.001). Etching dentine surfaces before cementation significantly increases bond strength in casting posts cemented with Xeno.

KEYWORDS: Casting post; Acid etching; Tensile bond strength; Resin cement

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