Fatigue of the resin-enamel bonded interface and the mechanisms of failure - UTU Research Portal

A1 Refereed original research article in a scientific journal

Fatigue of the resin-enamel bonded interface and the mechanisms of failure

Authors: Yahyazadehfar M, Mutluay MM, Majd H, Ryou H, Arola D

Publication year: 2013

Journal: Journal of the Mechanical Behavior of Biomedical Materials

Volume: 21

First page : 121

Last page: 132

Number of pages: 12

ISSN: 1751-6161

DOI: https://doi.org/10.1016/j.jmbbm.2013.02.017

Abstract

The durability of adhesive bonds to enamel and dentin and the mechanisms of
degradation caused by cyclic loading are important to the survival of composite
restorations. In this study a novel method of evaluation was used to determine
the strength of resin-enamel bonded interfaces under oth static and cyclic
loading, and to identify the mechanisms of failure. Specimens with twin
interfaces of enamel bonded to commercial resin composite were loaded in
monotonic and cyclic 4-point flexure to failure within a hydrated environment.
Results for the resin-enamel interface were compared with those for the resin
composite (control) and values reported for resin-dentin adhesive bonds. Under
both modes of loading the strength of the resin-enamel interface was
significantly (p≤0.0001) lower than that of the resin composite and the
resin-dentin bonded interface. Fatigue failure of the interface occurred
predominantly by fracture of enamel, adjacent to the interface, and not due to
adhesive failures. In the absence of water aging or acid production of biofilms, 
the durability of adhesive bonds to enamel is lower than that achieved in dentin 
bonding.