歯科ろう着に関する研究 (第7報) : ろう着間隙が適合精度に及ぼす影響

概要

論文の詳細を見る
The space of soldering gap was considered as one of the factors that affect the fitness accuracy of the soldering bridge. Three-unit posterior straight bridge was assembled by soldering with the second premolar and molar as abutments and the first molar as a pontic on the right mandible. The soldering gaps were made in three kinds ; 50μm, 150μm, 300μm. The three-dimensional distortion of both abutments to the pontic was measured, and the displacement and distortion as well as vectors were examined. The results are obtained as follows : 1. The direction of displacement showed a similar tendency even when the space of the gap was changed. 2. Both the displacement quantity and S. D. values were smaller wheut the space was narrower, and a bridge with a wider space showed larger S.D. values. 3. As to the distortion, the occlusal surface was bent throughout the bridge and the distortion was observed in the direction of the cervical of the tooth. The S.D. value of the distortion was larger when the space was wider. 4. In terms of vectors, both the displacement quantity and the S.D. values were large whenthe space was 300μm. It is therefore suggested that the displacement quantity is difficult to be controlled when the soldering gap is too wide.
日本補綴歯科学会の論文
1987-12-01