天然歯および歯冠修復材料の衝撃滑走摩耗に関する実験的研究

概要

論文の詳細を見る
A number of studies have reported comparisons of wear resistance of dental materials in various ways such as toothbrushing and sliding tests. In this study, an impacting-sliding motion was applied for evaluating the relative wear resistance of dental porcelain, Au-Ag-Pd alloy, hard and soft types of Ni-Cr alloys, acrylic resin and tooth enamel. Hemispherical and flat specimens were prepared, and their surfaces were smoothly polished except for those of the porcelain which were finished by glazing. One stroke of the wear test consisted of dropping of the upper hemispherical specimen onto the lower flat specimen and successive sliding along it under a load of 500gf. Such an impacting and sliding motion was repeated 10, 000 times at a rate of 40 strokes/min. Significantly larger wear was generally observed on the lower flat specimen when the upper slider specimen was made of the same material as the lower. Although the porcelain was extremely harder than any other materials, the porcelain slider caused not so larger wear tracks on the tooth enamel and Ni-Cr alloys. The porcelain was also abraded with the metal and enamel sliders, which was probably due to the scratching action of the small porcelain fragments yielded in impacting. The enamel showed significantly larger wear with the enamel slider. It was less abraded with the porcelain and Ni-Cr alloys, and no detectable wear was found with Au-Ag-Pd alloy and acrylic resin. The finely polished harder type Ni-Cr alloy not only caused smaller wear on the other materials but also was less abraded with them. The softer type Ni-Cr alloy and Au-Ag-Pd alloy exhibited significant relative wear with each other. The acrylic resin showed severe wear with the resin while it caused no perceptive wear on any other materials and enamel. The foregoing findings indicate that the relative wear may not always be affected by the hardness but by the other physical and mechanical properties such as configuration, surface aspect, elasticity, plasticity and impact strength of the materials.
九州歯科学会の論文
1990-06-25

著者

原健治
九州歯科大学歯科補綴学第2講座:九州歯科大学歯科理工学講座

天然歯および歯冠修復材料の衝撃滑走摩耗に関する実験的研究

スポンサーリンク

概要

著者

関連論文

スポンサーリンク