Dumais M H
Quintessence Int. 1990 Nov;21(11):897-902.
Although polypropylene copings have been used for porcelain-fused-to-metal patterns and recently for pin-retained castings, their use for partial veneer crowns has not been reported. This paper describes the use of copings for mesio-occlusodistal onlays, three-quarter crowns, and seven-eighths crowns. Some of the problems encountered in the fabrication of such restorations can be eliminated. Pattern fractures are almost nonexistent during the waxing stage. Groove or box adaptation to the preparation is easily maintained, and the internal aspects of the crowns are cleaner and smoother.
尽管聚丙烯顶盖已用于烤瓷熔附金属修复体的制作，近来也用于桩核铸造修复体，但尚未见其用于部分贴面冠修复的报道。本文描述了将顶盖用于近中-牙合-远中嵌体、3/4冠和7/8冠修复的情况。制作这类修复体时遇到的一些问题可以消除。在熔模制作阶段几乎不会出现熔模折断的情况。易于保持沟或箱状结构与牙体预备的贴合，并且冠的内部更清洁、更光滑。
