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KMID : 0376319900020010269
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Dental Journal of CNU
1990 Volume.2 No. 1 p.269 ~ p.281
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THE EFFECTS OF SURFACE TREATMENT OF FRACTURED METAL-CERAMIC CROWN ON BOND STRENGTH OF REPAIR RESIN
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Jeong Ae-Ri
Vang Mong-Sook
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Abstract
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The purpose of this study was to evaluate the effect of surface treatment of fractured metal-ceramic crown on bond strength of porcelain repair resin.
The specimens were divided into two groups for metal specimens and five groups for porcelain specimens by surface treatment methods.
The metal specimens were treated by 2 methods.
: micro-sandblasting with 50㎛ aluminum oxide and grinding with diamond bur.
The porcelain specimens were treated by 5 methods.
: micro-sandblasting with 50㎛ aluminum oxide, grinding with diamond bur, etching with porcelain etching agent, combination of micro-sandblasting and etching procedure, and combination of grinding and etching procedure.
After surface treatment, each specimen was bonded with composite resin and the bond strength was measured and the surface texture was observed by scanning electromicroscope(SEM).
The results were as follows :
1. There was significant difference in shear bond strength between metal specimen and porcelain specimen.
2. Bond strength of metal specimens treated with coe diamond bur was higher than that treated with 50㎛ alumium oxide sandblasting.
3. Bond strength of porcelain specimen treated with diamond bur was higher than that treated with 50㎛ aluminum oxide sandblasting and porcelain etching agent.
4. There was no significant difference in shear bond strength between the group treated with diamond bur and combined treatment groups respectively.
5. The large undercuts were observed in group treated with diamond bur by SEM.
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