カラーレスポーセレン冠の基礎的研究

概要

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Collarless porcelain veneer crown has excellent esthetic properties in the area of the lavial margin. It can eliminate the underlying metal collar and minimize the plaque retention. Several techniques such as platinum foil, refractory die, and direct lift techniques, have evolved an attempt to simplify the making procedure of this restoration. The present paper deals with the improved direct lift technique. The conventional direct lift technique has a problem of poor marginal integrity. Recentry "margin porcelain", high temperature fusing dentin powder, and "corrective powder of margin (C.P.M)" were developed, and the use of these materials could easily improved the adaptability of the porcelain margin. After cementation of the porcelain crown, cement thickness was between 5 to 18 μm at the margin. It is found that the margin of the porcelain crown has a tendency to be rounded off during final baking. Such a rounded shape of the margin will result in allowing the minimal extention into gingival sulcus and it may be favorable for the periodontal health. This technique does not require as much skill for the dentist and technician as the other techniques do. Although some problems still remain in the die material or others, this technique was confirmed to be effective.
九州歯科学会の論文
1984-04-25