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A Microshear Test to Measure Bond Strengths of Dentin-Polymer Interfaces



Walter G. McDonough, Joseph M. Antonucci, J He, Y Shimada, Martin Y. Chiang, Gary E. Schumacher, Carl R. Schultesiz


Mechanical property tests such as the diametral tensile, uniaxial tensile and transverse strength tests are commonly used in studying the interfacial properties of the bond between dental composites and dental substrates such as dentin and enamel. These tests, while providing useful information, can be difficult to interpret because of the interaction of many competing failure modes that accompany failure. With these challenges in mind, a microshear test has been developed in an effort to reduce the complexity of events that can confound the analysis at the interface. In the case of enamel, adhesion occurs primarily by micro-mechanical interlocking resulting from the penetration of the unpolymerized resin into a superficial porous zone to form polymeric resin tags. Because of the structural anisotropy of enamel, it is thought that variation in enamel bonding sites might influence the bonding strength of direct restorative systems to this substrate. The purpose of this study was to study how regional tooth structure variation and the effect of enamel rod orientation affects the bonding ability of a non-priming adhesive system.
No. 17


adhesion, dental composites, mechanical testing, microshear, uncertainty


McDonough, W. , Antonucci, J. , He, J. , Shimada, Y. , Chiang, M. , Schumacher, G. and Schultesiz, C. (2002), A Microshear Test to Measure Bond Strengths of Dentin-Polymer Interfaces, Biomaterials, [online], (Accessed July 14, 2024)


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Created June 1, 2002, Updated February 19, 2017