Journal
DENTAL MATERIALS
Volume 21, Issue 7, Pages 656-664Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dental.2004.09.002
Keywords
coupling agent; hydroxyapatite; composite; nano-indentation; polymethyl-methacrylate; surface treatment; mechanical properties; dental implant material
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Objectives. To examine the use of nano-indentation as a method of determining the interfacial mechanics of bioactive composites for mandibular bone substitutes. Methods. Three coupling agents (PMMA-MAA, PMMA-MA and silane) were used to treat hydroxyapatite (HA) particles before incorporation into a polymethylmethacrylate (PMMA) matrix. Nano-indentation was used to determine the hardness and Young's modulus on the HA particle surface, at the HA/PMMA interface and in the PMMA matrix region for each of the four groups. In addition bulk four-point bending tests were conducted on each of the four groups as a comparison. Results. The findings resulted in significant differences in the local interfacial Young's modulus between the polymer-treated composites and the uncoupled control specimens with a marked improvement (50%) in modulus with either polymertreated group. Similarly, the bending modulus of the polymer-treated groups was significantly higher than the un-treated control group; however, these differences were not as pronounced (approximately 15%). Significance. The co-polymer-treated composites resulted in improved interfacial modulus as compared to the un-treated controls and that the nano-indentation technique is a powerful tool. for understanding the local interfacial mechanics of bioactive composites. (C) 2005 Academy Dental Materials. Published by Elsevier Ltd. All rights reserved.
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