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Fracture Properties of Human Enamel and Dentin

Stephen T. Rasmussen

School of Dentistry, Louisiana State University, New Orleans, Louisiana 70119, USA, School of Dentistry and Division of Metallurgy and Materials, Case Western Reserve University, Cleveland, Ohio 44106

Robert E. Patchin

School of Dentistry, Louisiana State University, New Orleans, Louisiana 70119, USA, School of Dentistry and Division of Metallurgy and Materials, Case Western Reserve University, Cleveland, Ohio 44106

David B. Scott

School of Dentistry, Louisiana State University, New Orleans, Louisiana 70119, USA, School of Dentistry and Division of Metallurgy and Materials, Case Western Reserve University, Cleveland, Ohio 44106

Arthur H. Heuer

School of Dentistry, Louisiana State University, New Orleans, Louisiana 70119, USA, School of Dentistry and Division of Metallurgy and Materials, Case Western Reserve University, Cleveland, Ohio 44106

Work of fracture measurements and scanning electron microscope fractographs show that both enamel and dentin can best be considered as brittle materials with anisotropic fracture properties. Enamel is highly anisotropic, with the weakest path of fracture parallel to the enamel rods. Dentin is less anisotropic, with easiest fracture perpendicular to the dentinal tubules. A model is proposed to explain the fracture behavior of enamel.

Journal of Dental Research, Vol. 55, No. 1, 154-164 (1976)
DOI: 10.1177/00220345760550010901
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