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KMID : 0354619930050010151
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Journal Dankook Dental Research Institute
1993 Volume.5 No. 1 p.151 ~ p.162
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An Experimental Study on Adhesion Pattem, Adhesion Strength and Fracture Pattem of the Adhesive Cast Gold Inlay
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Abstract
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Zinc Phosphate Cement had been used for bout more than 100 years in luting of cast gold inlay. But many scientists had been trying to develop the new form of luting agent because the ZPC had shown the lack of adhesiveness on the tooth structure
and
the
toxicity to the pulp tissue.
Recently many researches about the surface treatment of the cast body are being done to increase the adhesion of cement to it.
The conventional Class I gold inlays were fabricated in the 20 permanent molars. After the internal surface of the cast body was sandblasted with A12O3 particles and was tin-plated, the inlays were cemented with adhesive cement [G I cement and
resin
cement(Super-Bone & PanaviaEX)] and the evaluation on the adhesion pattern, adhesive strength and the fracture pattern of the adhesive cast gold inlay was compared to that of the cast gold inlay cemented conventionally with ZPC.
@ES The results were as follows :
@EN 1. The surface roughness of the cast body was increased significantly after sandblasting with the A12O3 , particles and the tin oxide layer, which was consisted of round particles, came into being.
2. The bond strength was in the order of Super-Bond, ZPC. Fuji I, PanaviaEX group. The group cemented with Super-Bond showed statistically greater strength than the other groups(p<0.05).
3. The group cemented with ZPC was fallen apart by principal adhesion failure and that with Fuji I was by complete adhesion failure. But the group with Super-Bond showed principal cohesive failure pattern and in the group with PanaviaEX,
complete
cohesive fracture pattern was shown and small portion of tooth structure was fracture out with cast body and the fractured surface surface showed the figure just as the enamel prism.
4. Various gaps were shown at the pulpal side regardless of little gap at the side walls oif the cavity in all groups. Only the Super-Bond was attached to the tooth structure and the other cements were detached from both the tooth and cast body.
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