A comparison of the mechanical properties of three glass-ionomer cements.
A comparison was made on the mechanical properties of three glass-ionomer cements, one of which was of experimental fiber-reinforcing and auto-curing type. Two others were proprietary auto-curing and light-activating cements. Biaxial flexure test was conducted on disc samples. Three-point bending test was also carried out on bar samples to determine modulus of elasticity and strength. All samples were kept at 37 degrees C and 100% RH for 24 h before testing under ambient conditions. A prolonged fracture process was observed in the experimental cement, demonstrating the effect of fiber incorporation in stabilizing the fracture process. The proprietary cements failed in a brittle manner. Comparison of the mechanical properties identified three characteristics. These were a high Weibull modulus resulting from the stabilization in fracture process, a modulus of elasticity value comparable to that of dentin, and a high biaxial flexure strength close to that of a dental resin composite.
Poolthong
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S
Biomaterials Research Unit, Faculty of Dentistry, The University of Sydney, Australia.
Mori
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Swain
M V
MV
D003799:Dental Stress Analysis; D004548:Elasticity; D005898:Glass; D005899:Glass Ionomer Cements / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D018583:Pliability; D012117:Resins, Synthetic / Q000737:chemistry; D013718:Tensile Strength
C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D012117:Resins, Synthetic; C009753:fiberglass; C068076:Chelon Fil