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J Dent Res 46(1): 197-201, 1967
© 1967 International and American Associations for Dental Research
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Tensile Strength of Human Dentin

M. L. LEHMAN 1

1 Department of Operative Dental Surgery, The University of Sheffield, Sheffield, England

The tensile strength of human dentin is much below its compressive strength. Approximately 6,000 psi for the tensile strength of this tissue seems to be acceptable.

Since there is no departure from Hooke's law, the proportional limit indicates the fracture point of this tissue in tension.

The tensile strength of dentin is less than half the tensile strength of compact bone.

The tensile strength of human dentin seems to be approximately the same as the tensile strength of the periodontal membrane.

Since the tensile strength of human dentin is only about a sixth or a seventh of its [see figure in the PDF file] [see table in the PDF file] compressive strength, restorative design should compensate for this structural deficiency.

It may be pointed out that the results obtained in this series should not be taken as absolute values. In all likelihood, human dentin, because of its peculiar histologic structure, will display different magnitudes of tensile strength in different parts of a tooth. In other words, it may be accepted that this tissue is a nonisotropic material and thus displays a similarity to bone.7

Submitted on December 8, 1965




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