歯科補綴材の咬合接触摩耗。in vivoでの研究

Occlusal contact wear of prosthodontic materials. An in vivo study.

抄録

レジンやポーセレンの歯と咬合面で接触する金，ポーセレン，熱硬化型および光硬化型レジンの摩耗をin vivoで研究した．固定式部分補綴物の取り外し可能なセグメントの重量測定と，摩耗した表面を走査型電子顕微鏡で観察できるレプリカ技術の両方を用いた．その結果，すべての材料において，対合歯がポーセレンの場合に最も物質が失われることがわかった．また，熱硬化型レジンが最も耐摩耗性が低く，次いで光硬化型レジン，ポーセレン，金の順であった．熱硬化型レジンはトライボケミカルと疲労の複合的な摩耗を示した。光硬化型レジンとポーセレンは主に疲労型の摩耗を示し，金は研磨型と疲労型の複合型の摩耗を示した。

The wear of gold, porcelain, and heat- and light-cured resins in occlusal contact with resin and porcelain teeth has been studied in vivo. Both weighing of removable segments of fixed partial prostheses and a replica technique allowing scanning electron microscope observations of the worn surfaces were used. The results showed that all materials had the greatest loss of substance when the opposing teeth were of porcelain. The heat-cured, unfilled resin was the least wear-resistant material, followed by light-cured resin, porcelain, and gold. The heat-cured resin showed a combined tribochemical and fatigue type of wear. The light-cured resin and porcelain showed mainly a fatigue type of wear, whereas gold showed a combined abrasive and fatigue type of wear.