Litkowski L J, Swierczewski M
University of Maryland, Dental School, Baltimore 21201.
Oper Dent. 1991 Jan-Feb;16(1):13-6.
The effect on microleakage of a modification of the cavosurface finish was evaluated using extracted thermalcycled teeth. Composite resin was placed in cavity preparations on root surfaces of teeth and finished to leave either a flash of material on the margin or finished flush to the margin. The teeth were thermalcycled for 10 days at 5 and 55 degrees C. The teeth were evaluated for microleakage using the silver nitrate staining procedure. Results showed a significant decrease in the amount of microleakage on the margins finished leaving a flash of composite resin. Clinical trials placing these restorations on root surfaces will be necessary to evaluate the impact on the periodontal health.
使用经过热循环处理的离体牙，评估洞缘预备改良对微渗漏的影响。将复合树脂置于牙齿根面的窝洞预备中，完成后使边缘留有一层树脂飞边或与边缘齐平。牙齿在5℃和55℃下进行10天的热循环。使用硝酸银染色法评估牙齿的微渗漏情况。结果显示，在完成后边缘留有复合树脂飞边的情况下，微渗漏量显著减少。有必要进行将这些修复体置于根面的临床试验，以评估对牙周健康的影响。
