Owens B M, Halter T K, Brown D M
Department of General Dentistry, University of Tennessee, College of Dentistry, Memphis 38163, USA.
Quintessence Int. 1998 Jun;29(6):356-61.
Microleakage of tooth-colored restorative systems was tested in preparations with and without beveled gingival margins.
A resin composite, Z-100, and two "compomer" restoratives, Dyract and Geristore, with their accompanying adhesive systems, were placed in nonretentive cervical cavity preparations (at the cementoenamel junction), with and without a beveled gingival margin (dentin or cementum) and beveled occlusal (enamel) margins in extracted bovine teeth. Microleakage was assessed as the ratio of the extent of methylene blue dye penetration at the tooth-restoration interface of the length of the wall.
Z-100 restorations, without a gingival bevel, exhibited significantly less microleakage along the gingival wall and less microleakage overall than did the other materials. Dyract restorations without a gingival bevel and placed without a surface conditioner displayed greater microleakage overall than did the other groups.
With all materials, Class V restorations with gingival bevels displayed greater microleakage than did nonbeveled margins.
在有和没有斜切牙龈边缘的制备物中测试牙齿颜色修复系统的微渗漏情况。
将一种树脂复合材料Z-100以及两种“复合体”修复材料Dyract和Geristore及其配套的粘结系统，放置于拔除的牛牙上非固位性颈部洞形制备（在牙骨质釉质界处），有和没有斜切牙龈边缘（牙本质或牙骨质）以及斜切咬合面（釉质）边缘的情况。微渗漏评估为亚甲蓝染料在牙齿修复界面处渗透范围与洞壁长度的比值。
没有牙龈斜面的Z-100修复体，沿牙龈壁的微渗漏明显少于其他材料，总体微渗漏也更少。没有牙龈斜面且未使用表面处理剂放置的Dyract修复体，总体微渗漏比其他组更大。
对于所有材料，有牙龈斜面的V类修复体比没有斜面的边缘显示出更大的微渗漏。
