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KMID : 0362219920190020167
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Journal of The Korean Research Society for Dental Materials
1992 Volume.19 No. 2 p.167 ~ p.172
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THE DIAMETRAL TENSILE STRENGTH OF METAL IMPROVED GLASS IONOMER CEMENTS
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Abstract
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Glass ionomer cements possess certain properties that make them useful as a restorative filling material. These properties include (1) chemical bonding to tooth enamel and dentin, (2) therelease of fluoride ions, and (3) biocompatibility. However
glass
ionomer cements are susceptible to fracture and exhibit a low resistance to abrasion. For improving their strength, the addition of metal powders has been directed. Two different formulas of glass ionomer cements have been developed to improve
wear
resistance and strength. One material is composed of a simple mixture of glass ionomer powder and amalgam alloy. The other is based on bonding of silver particles to glass particles by high temperature sintering and is called a cermet cement.
The purpose of this study was to compare physical properties of one unreinforced glass ionomer cement and two metal reinforced glass ionoomer cement. The physical property evaluated was diametral tensile strength. Specimens.
4mm(diameter)×2.5mm(heigth), were prepared and maintained in 100% humidity, 37℃. Then the diametral tensile strength was tested by the universal testing machine, with a cross head speed of 2mm/min at 30minute and 24hrs after setting.
All tested materials materials were increased in strength at 24hrs than at 30minutes.
The cermet cement appeared to be significantly stronger in diametral tensile strength than either of Miracle Mix and unreinforced glass ionomer cement.
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