カルボキシレートセメントの合着力におよぼす繰り返し荷重の影響

概要

論文の詳細を見る
Durability in the retention of the cemented crown was examined when compressive loads of 2.5 to 10.0 kg were repeatedly applied to the occlusal plane. The chamfer type of Ni-Cr alloy crown and abutment tooth model were prepared, and they were fixed with polycarboxylate and zinc phosphate cements. The retention of the crown was decreased in seven days for polycarboxylate cement and in three days for zinc phosphate cement by storing the cemented crown and model in water at 37℃ without any loading. On the other hand, the retention was increased when relatively smaller compressive loads were repeatedly applied to the occlusal plane. It might be due to the increased mechanical interlocking resulting from denser packing or wall-to-wall expansion of the enclosed cement. It was also found that the retentive force of the cement was deteriorated by fatigue under larger levels and numbers of repeated loading or by fracture under loading at the earlier stage such as one hour after fixation.
九州歯科学会の論文
1989-04-25