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VOLUME 8 , ISSUE 2 ( February, 2007 ) > List of Articles


A Comparison of Two Different Methods and Materials Used to Repair Polycarbonate Crowns

Asude Yilmaz

Citation Information : Yilmaz A. A Comparison of Two Different Methods and Materials Used to Repair Polycarbonate Crowns. J Contemp Dent Pract 2007; 8 (2):105-112.

DOI: 10.5005/jcdp-8-2-105

License: CC BY-NC 3.0

Published Online: 01-02-2007

Copyright Statement:  Copyright © 2007; Jaypee Brothers Medical Publishers (P) Ltd.



The aim of this study was to evaluate the bond strength and crown-repair material interface of polycarbonate crown repaired using flowable resin composite and hybrid resin composite following two different surface preparations.

Methods and Materials

The facial surfaces of fifty-two polycarbonate crowns were flattened and roughened. Specimens were then divided into four test groups. A bonding agent alone (Groups 1 and 2) or a combination of methylmethacrylate (MMA) + bonding agent (Groups 3 and 4) was applied to the prepared surfaces. Then either a flowable (Groups 1 and 3) or a microfilled hybrid (Groups 2 and 4) resin composite was placed on the surfaces. Forty-eight of the original fifty-two specimens were used for shear bond strength testing. Failure types (adhesive, cohesive, and mixed) were evaluated. The remaining four specimens, one from each group, were used for crown-resin composite interface analysis using a scanning electron microscope (SEM).


There were significant differences in both mean shear bond strength values and failure types (P<0.05). The SEM evaluation revealed a close interface relationship in Groups 3 and 4.


MMA monomer application on a polycarbonate crown prior to application of an adhesive agent improved the shear bond strength of the repair material.


Yilmaz A. A Comparison of Two Different Methods and Materials Used to Repair Polycarbonate Crowns. J Contemp Dent Pract 2007 February;(8)2:0105-112.

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