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Wear of Fluorapatite Single Crystals : IV. Influence of Sliding Direction on Frictional Behavior and Surface Failure

School of Dentistry and College of Engineering, University of Michigan, Ann Arbor, Michigan 48104, USA

K.C. Ludema

School of Dentistry and College of Engineering, University of Michigan, Ann Arbor, Michigan 48104, USA

R.G. Craig

School of Dentistry and College of Engineering, University of Michigan, Ann Arbor, Michigan 48104, USA

Frictional anisotropy of the basal plane of natural fluorapatite single crystals was observed ; the coefficient of friction (β) in the [2110] direction (β = 0.217) was approximately 12% higher than that in the [0110] direction (β = 0.193). The load at which the ductile-to-brittle transition occurred () was significantly higher in the [2110] direction ( = 77 gm) than in the [0110] direction ( = 15 gm). A mechanism is proposed involving the maximum normal stress and probable cleavage planes.

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Journal of Dental Research, Vol. 52, No. 5, 1019-1025 (1973)
DOI: 10.1177/00220345730520050401


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