کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1422383 986445 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Micro-indentation fracture behavior of human enamel
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Micro-indentation fracture behavior of human enamel
چکیده انگلیسی

ObjectiveThe purpose of this study was to determine the crack resistance behavior (KR) of human enamel in relation to its microstructure.MethodsHuman molar teeth were precision cut, polished and tested using Vickers micro-indentation at different loads ranging from 0.98 to 9.8 N. Five indentation load levels were considered, 20 indentation cracks for each load level were introduced on the surface of the test specimen (10 indentations per tooth) and their variability was evaluated using Weibull statistics and an empirical model. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to analyze the crack morphology and propagation mechanisms involved.ResultsThe results showed that enamel exhibited increasing cracking resistance (KR) with increasing load. It was found that the crack propagation mainly depended on the location and the microstructure it encountered. SEM showed the formation of crack bridges and crack deflection near the indentation crack tip. The crack mode was of Palmqvist type even at larger loads of 9.8 N. This was mainly attributed to the large process zone created by the interwoven lamellar rod like microstructure exhibited by the enamel surface.SignificanceThis study shows that there are still considerable prospects for improving dental ceramics and for mimicking the enamel structure developed by nature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dental Materials - Volume 26, Issue 1, January 2010, Pages 100–104
نویسندگان
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