Fracture Processes and Mechanisms of Crack Growth Resistance in Human Enamel

被引:35
作者
Bajaj, Devendra [2 ]
Park, Saejin [2 ]
Quinn, George D. [1 ]
Arola, Dwayne [2 ,3 ]
机构
[1] NIST, Amer Dent Assoc Hlth Fdn, Paffenbarger Res Ctr, Gaithersburg, MD 20899 USA
[2] Univ Maryland Baltimore Cty, Dept Mech Engn, Baltimore, MD 21228 USA
[3] Univ Maryland, Dept Endodont Prosthodont & Operat Dent, Baltimore Coll Dent Surg, Baltimore, MD 21201 USA
基金
美国国家卫生研究院; 美国国家科学基金会;
关键词
INDENTATION DAMAGE; TOUGHNESS; BEHAVIOR;
D O I
10.1007/s11837-010-0113-8
中图分类号
T [工业技术];
学科分类号
120111 [工业工程];
摘要
Human enamel has a complex microstructure that varies with distance from the tooth's outer surface. But contributions from the microstructure to the fracture toughness and the mechanisms of crack growth resistance have not been explored in detail. In this investigation the apparent fracture toughness of human enamel and the mechanisms of crack growth resistance were evaluated using the indentation fracture approach and an incremental crack growth technique. Indentation cracks were introduced on polished surfaces of enamel at selected distances from the occlusal surface. In addition, an incremental crack growth. approach using compact tension specimens was used to quantify the crack growth resistance as a function of distance from the occlusal surface. There were significant differences in the apparent toughness estimated using the two approaches, which was attributed to the active crack length and corresponding scale of the toughening mechanisms.
引用
收藏
页码:76 / 82
页数:7
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