Journal of Dental Research, Vol 70, 1358-1361, Copyright © 1991 by International & American Associations for Dental Research Online Journals
Physical properties of stainless-steel and silver-reinforced glass-ionomer cements
R. E. Kerby and R. F. Bleiholder
Department of Restorative & Prosthetic Dentistry, Ohio State University College of Dentistry, Columbus 43210-1241.
The purpose of this study was to compare specific physical properties of an
experimental stainless-steel-reinforced glass-ionomer cement with those of
two commercially available silver-reinforced cements. Properties evaluated
were compressive and diametral tensile strengths (one and 24 h), percent
solubility in 0.01 mol/L lactic acid over 23 h, and working and setting
times. Cylindrical specimens 6 mm (diameter) x 12 mm were prepared and
maintained in distilled water at 37 +/- 2 degrees C and then tested on an
MTS mechanical testing machine with a cross-head displacement rate of 0.5
mm/min for the diametral tensile strength test and 1.0 mm/min for the
compressive strength test. ANOVA and Tukey's Studentized Multiple Range
Test indicated significant differences between the experimental and
commercially available cements for both compressive and tensile strengths
at one and 24 h (p less than 0.01). The experimental
stainless-steel-reinforced cement appeared to be significantly stronger in
both tensile and compressive strengths than either of the commercially
available cements. Working and setting times--as well as acid solubility of
the experimental cement--also compared favorably with those of the
commercial cements. Results suggest that the stainless-steel-reinforced
glass-ionomer cement possesses strength properties that should lead to a
stronger, more fracture-resistant restorative filling material when
compared with those presently available.
