Effects of Surface Treatment on Adhesive Strength of Cements to Castable Glass Ceramics

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  • キャスタブルガラスセラミックスと歯科用セメントとの接着強さ

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Abstract

This study examined the effects of surface treatment on the shear adhesive strenght of cements to castable glass ceramics. Castable glass ceramics (calcium metaphosphate) and four different dental cements (glass ionomer, polycarboxylate and two types of adhesive resin) were used. Cylindrical castable glass ceramic rods were cast for the shear adhesive strength test. Each was given a different surface treatment. The five different surface treatments were: group 1. polishing with 600 grit SiC abrasive paper; group 2. polishing with 120 grit SiC abrasive paper; group 3. sand blasting with alumina; group 4. HF containing etching solution; and group 5. wetting agent for porcelain. The rods in each group were cemented to each other. Using a film thickness adjustment apparatus, the film thickness of dental cement was adjusted to 50 μm and specimens were stored at 37℃, 100% relative humidity. The shear adhesive strength of each dental cement was measured 1 day after, 1 week after, 1 month after and 3 months after the rods were cemented. Shear adhesive strength of glass ionomer cement and polycarboxylate cement to castable glass ceramics polishing with 600 grit SiC abrasive paper were not obtained, 120 grit SiC abrasive paper were very low and HF containing etching solution was the most effective surface treatment. As for the influence of storage period in 37℃, 100% relative humidity on shear adhesive strength, all dental cements decreased in strength overtime, but statistical difference was observed only after 3 months.

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