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Materials ScienceThe Shear Strength of Dental Porcelain
W.M. Johnston
The University of Michigan, School of Dentistry, Ann Arbor, Michigan 48109
W.J. O'Brien
The University of Michigan, School of Dentistry, Ann Arbor, Michigan 48109
The widespread use of porcelain in restorative dentistry is generally due to its esthetic appearance even though it is brittle. The transverse strength, or modulus rupture, averages around 108 MPa (16,000 psi) for aluminous porcelain and 88 MPa (13,000 psi) for feldspathic porcelain.1 The tensile strength, as determined by diametral compression, is approximately 29 MPa (4,200 psi) for opaque feldspathic porcelain and 40 MPa (5,800 psi) for gingival feldspathic porcelain.2 The compressive strength is reported to be 340 MPa (50,000 psi) for a feldspathic porcelain.3 These mechanical strength properties of dental porcelain confine its use to low stress-bearing restorations or to those restorations with a metal substrate.
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- McLean, J.W. and Hughes, T.H.: The Reinforcement of Dental Porcelain with Ceramic Oxides, Brit Dent J 119:251-267, 1965.[Medline]
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- Anthony, D.H.; Burnett, A.P.; Smith, D.L.; and Brooks, M.S.: Shear Test for Measuring Bonding in Cast Gold Alloy-Porcelain Composites, J Dent Res 49:27-33, 1970.[Abstract/Free Full Text]
- Hamerink, H.A.; Arfaei, A.;and Asgar, K.: A Push-shear Test for Porcelain to Metal Bond, IADR Progr & Abst 54:No. 456, 1975.
- O'Brien, W.J.: Cohesive Plateau Theory of Porcelain-Alloy Bonding, in: Dental Porcelain: The State of the Art, Los Angeles: Univ. S. Calif. Sch. Dent., 1977, 358 pp.
- Cottrell, A.H.: The Mechanical Properties of Matter, Wiley, 1963, pp. 312-317.
- Davis, H.E.; Troxell, G.E.; and Wisko-Cil, C.T.: The Testing and Inspection of Engineering Materials, McGraw-Hill, 1964, pp. 150-164.
- O'Brien, W.J. and Ryge, G., Eds.: An Outline of Dental Materials and Their Selection, Philadelphia: W. B. Saunders Co., 1978, 187 pp.
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Journal of Dental Research, Vol. 59, No. 8,
1409-1411 (1980)
DOI: 10.1177/00220345800590080901
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