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Fracture Toughness of Human Enamel

School of Dentistry, New York University, New York, New York 10010

A.A. Caputo

Biontaterials Science Section, UCLA School of Dentistry

R.F. Bunshah

Materials Department, UCLA School of Engineering and Applied Science, Los Angeles, California 90024

A microindentation technique was employed to estimate the fracture toughness of human enamel. A pattern of increasing fracture toughness values existed from incisal to cervical in incisor enamel. Statistical analysis indicated that the molar enamel was more brittle than either the canine or incisor enamel. It was observed that the cracks emanating from the comers of an indentation propagated preferentially, with the weakest path of fracture usually extending along the cervical-incisal axis.

Journal of Dental Research, Vol. 60, No. 4, 820-827 (1981)
DOI: 10.1177/00220345810600040901


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