Mehl Albert, Kunzelmann Karl-Heinz, Folwaczny Matthias, Hickel Reinhard
Department of Restorative Dentistry, Ludwig Maximilians University, Munich, Germany.
J Adhes Dent. 2004 Autumn;6(3):239-45.
Using extended, standardized MOD preparations, it was the aim of this in vitro study to examine the performance of CAD/CAM ceramic inlays in comparison to composite inlays after mechanical and thermal fatigue loading in terms of marginal quality and stabilization of the remaining tooth structure.
Standardized cavities with different wall thicknesses were prepared in 90 extracted premolars; 10 additional premolars remained untreated. Composite inlays (Tetric) and CAD/CAM restorations (Cerec II; Vita Mark II) were adhesively placed in the cavities. After loading in a chewing simulator, quantitative and qualitative marginal gap examinations were conducted and fracture resistance determined.
The results show that ceramic inlays provide significantly greater stabilization and better marginal quality than do composite inlays.
Chairside-fabricated ceramic inlays inserted using adhesive technology are able to stabilize weakened cusps. In the case of very thin remaining walls (about 1.3 mm), however, the marginal quality and the cusp-stabilizing effect are also reduced.
本体外研究旨在使用扩展的标准化MOD修复体，在机械和热疲劳加载后，从边缘质量和剩余牙体结构的稳定性方面，比较CAD/CAM陶瓷嵌体与复合树脂嵌体的性能。
在90颗拔除的前磨牙上制备具有不同壁厚的标准化洞型；另外10颗前磨牙未作处理。将复合树脂嵌体（Tetric）和CAD/CAM修复体（Cerec II；Vita Mark II）粘结置入洞型中。在咀嚼模拟器中加载后，进行定量和定性的边缘间隙检查并测定抗折性。
结果表明，陶瓷嵌体比复合树脂嵌体具有显著更高的稳定性和更好的边缘质量。
使用粘结技术椅旁制作的陶瓷嵌体能够稳定削弱的牙尖。然而，在剩余壁非常薄（约1.3mm）的情况下，边缘质量和牙尖稳定效果也会降低。
