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The Effect of Using Layered Specimens for Determination of the Compressive Strength of Glass-ionomer Cements

Materials Technology Group, Laboratory of the Government Chemist, Queens Road, Teddington, Middlesex, TW11 OLY, United Kingdom

J.W. Nicholson

Materials Technology Group, Laboratory of the Government Chemist, Queens Road, Teddington, Middlesex, TW11 OLY, United Kingdom

J.F. McCabe

Dental Materials Science Unit, Department of Prosthodontics, The Dental School, Newcastle-upon-Tyne, NE2 4BW, United Kingdom

Compressive strength is widely used as the criterion of strength of glass-ionomer dental cements, despite the difficulties in interpretation of the findings. With the introduction of light-cured glass-ionomer cements, which can be used only in thin layers, the question arises of how test specimens should be prepared for the measurement of compressive strength. A suggested method has been to prepare test pieces by building them up in layers, an approach which is examined critically in the current paper. Two different conventional (acid-base) glass-ionomers were studied with the use of layered and unlayered specimens of dimensions 6 mm (height) x 4 mm (diameter) and 12 mm (height) x 6 mm (diameter). While smaller samples gave the same value of compressive strength as larger specimens, layered specimens gave significantly lower values of compressive strength for both sizes. In view of these findings, and since the layered specimens are tedious to prepare, we conclude that compressive strength is unsatisfactory as a criterion of strength for light-cured glass-ionomer cements.

Journal of Dental Research, Vol. 71, No. 12, 1871-1874 (1992)
DOI: 10.1177/00220345920710120301


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