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A Novel Microshear Test to Measure Dental Adhesion



Joseph M. Antonucci, Walter G. McDonough, Gary E. Schumacher, Y Shimada


A key factor in determining the strength and durability of polymeric dental restorative composites, sealants and adhesives is the quality of their interfaces/interphases. Bulk mechanical strength tests such as tensile, transverse and shear tests are commonly used in studying the interfacial properties of dental composites. For evaluating the adhesion between dental composites and tooth structure, uniaxial tensile or shear bond tests are routinely applied to relatively large areas of enamel and/or dentin. Human enamel consists mainly of apatitic calcium phosphate arranged in a highly ordered prismatic array. This prismatic structure causes enamel to behave anisotropically. Similarly, dentin has an anisotropic character because of its ordered tubular structure. Thus, depending on the position and area of the bonding site both enamel and dentin can present a complex, variable substrate for dental adhesion studies. In an effort to address these potential regional and size effects on bonding to tooth structure, several microtensile bond test methods recently have been developed.Although these micro-bond tests have a number of advantages more precise correlation of adhesion with substrate loci) over both conventional macrotensile and macroshear bond tests, they are highly labor-intensive with regard to specimen preparation. The primary purpose of this study was to develop a microshear bond test that has many of the advantages of the microtensile methods but without their highly labor-intensive nature.An additional purpose was to study how regional tooth structure variation and the orientation of enamel prisms and dentinal tubules, due to tooth sectioning, affects the bonding ability of a self-etchilng primer system and a conventional adhesive system that uses a separate acidic conditioner (mass fraction, 40 % phosphoric acid, H3PO4). Some of the opportunities that the microshear bond strength test offers in enhancing our understanding of dental adhesion and aiding in the design of improved dental adhesive systems also will become evident.
Proceedings Title
Proceedings of the 24th Annual Meeting of the Adhesion Society
Conference Dates
February 25-28, 2001
Conference Title
Adhesion Society


adhesion, anisotropy, dentin, enamel, microshear, primer, self-etching


Antonucci, J. , McDonough, W. , Schumacher, G. and Shimada, Y. (2001), A Novel Microshear Test to Measure Dental Adhesion, Proceedings of the 24th Annual Meeting of the Adhesion Society, [online], (Accessed June 16, 2024)


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Created February 1, 2001, Updated February 19, 2017