복합레진 수리시 인산 및 실레인 표면처리가 전단 결합 강도에 미치는 영향
Effect of Surface Treatment with Phosphoric Acid and Silane on the Shear Bond Strength of Repaired Composite Resin
복합레진 인산 실레인 표면처리;
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When we repair the aged composite resin restorations which are already contaminated with saliva intraorally, it's well known that the surface treatment of the aged composites affects the bond strength of repaired composites. The purpose of this study was to evaluate the effect of surface treatment with phosphoric acid and silane on the shear bond strength between the aged("previously polymerized and salivary contaminated") and the repaired("fresh and newly added")composites. According to the different surface treatment sequence, specimens were assigned into control group and 3 experimental groups; Control group : SiC-sandpaper and bonding agent, Exper. 1 group: SiC-sandpaper, phosphoric acid and bonding agent, Exper. 2 group: SiC-sandpaper, silane and bonding agent, Exper. 3 group: SiC-sandpaper, phosphoric acid, silane and bonding agent. The shear bond strengths were measured, and then, failure patterns were compared. The surface morphologic changes were observed just before application of bonding agent by means of using a scanning electron microscope. The results of this study were as follows : 1. The shear bond strength of Exper. 3 group was the highest, but not significant. 2. Between the shear bond strength of K group (Kuraray products) and U group(Ultradent products)in the respective experimental groups and control group, there was no significant difference statistically. 3. Etching groups showed somewhat higher bond strength than non-etching groups, but not significant. 4. Silaning groups showed much higher bond strength than non-silaning groups, and there was significant difference statistically. 5. Both etching and silaning caused adhesive failure pattern to decrease and cohesive failure pattern to increase. 6. SEM views represented that the filler particles of silaning groups were less rough than those of non-silaning groups by wetting effect of silane.