[in Japanese]

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[in Japanese]

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For appropriate functioning of head rasin for posterior restorations in the oral cavity, not only the mechanical strength of the restoration material itself but also its fitness and bonding to the abutment tooth, i.e., unification with the tooth, is indispensable. One of the factors associated with bonding is surface treatment of the bonding is surface of the restoration material. To the clarify the effects of surface treatment on the bond strength of head rasin for posterior restorations, we performed the combination of sandblast treatment, silane treatment, and heat treatment of the bonding surface before bonding with reasin cement. After storage of the samples at 37°C for 24 hours followed by 3, 000 thermal cycles (4-60°C), bond strength was measured. Bond strength improved after sandblast treatment performed in combination with silane treatment and heat treatment of the bonding surface. Even after thermal cycles, bondstrength only slightly decreased. Therefore, the combination of sandblast treatment. silane treatment and heat treatment of the bonding surface. Even after thermal cycles, bond strength only slightly decreased. Therefore, the combination of sandblast treatment, silane treatment, and heat treatment of the bonding surface head rasin for posterior restorations is useful for improving bond strength and bonding durability.

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There are some different techniques recently developed for improving abnormal from of alveolar ridge where the prosthetic treatment is needed. The grafting of great amount of tissue is necessary in type II and type III case of (Seivert) classification for correcting the defect. Autogenous bone is reported as the best choice for grafting. In fact the amount of bone available from donor site is limited. Mentle area of oral cavity is considered to be the best site for donating bone by its easily approach character during operation. Ridge augmentation with autogenous bone taken from mental area to correct from of alveolar ridge in maxillary anterior edentulous case will be reported.

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[in Japanese]

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