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KMID : 0362419910290030033
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Journal of Korean Academy of Prosthodontics
1991 Volume.29 No. 3 p.33 ~ p.41
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A COMPARATIVE STUDY ON THE SHEAR BOND STRENGTH OF DICOR AND g-CERA PORCELAIN LAMINATE VENEER
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Cho Mi-Sook
Yang Jae-Ho
Lee Sun-Hyung
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Abstract
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Cermic has been widely used because of its excellent esthetics and strength. The recently introduced castable ceramic system is regarded as the more esthetic and biocompatible restorative material. The purpose of this study was to compare the shear bond strength of Dicor & Dicor & G-Cera porcelain laminate veneer according to the type of cement and surface treatment and to observe the surface of bonding failure with SEM. Total forty disks(3.5㎜ diam.32.0㎜ thickness) were prepared. Forty extracted human maxillary central incisor teeth were stored in saline solution. Ten teeth were bonded to Dicor specimen with Dicor ZPC cement and ten teeth were bonded with Dicor resin cement. Ten silicoated G-Cera specimen and ten non-silicoated G-Cera specimen were bonded to teeth with G-Cera resin cement. Bonded units were mounted in a plastic tube with hard stone and stored in a humidor at 37℃ for 24 hours. Shear bond strength was measured by Instron Universal Testing Machine (Model 1125) and all the specimen were observed with SEM(JEOL, JSM-T2000) and modes of failure were recorded. The obtained results were as follows : 1. The mean shear bond strength of Dicor bonded with Dicor resin cement was 11.62 Mpa and that bonded with Dicor ZPC cement was 0.88 Mpa : Shear bond strength of Dicor bonded with Dicor resin cement was significantly increased(P<0.05). 2. The mean shear bond strength of silicoated G-Cera was 13.10 Mpa and that of non silicoated G-Cera was 10.93 Mpa : Shear bond strength of silicoated G-Cera was not significantly increased (P>0.05). 3. Shear bond strength of Dicor and G-Cera porcelain laminate veneer was not significantly different (P>0.05). 4. In observation of bond failure with SEM, Dicor bonded with Dicor ZPC cement exhibited adhesive failure. Dicor bonded with Dicor resin cement and silicoated and non silicoated G-Cera exhibited cohesive failure.
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KEYWORD
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porcelainlaminateveneer, shearbondstrength
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