不同洞缘设计对树脂充填微漏影响的体外研究

A study on the effect of different designs of cavity margins on microleakage of resin fillings in vitro

在离体磨牙面上，分别设计制备１、２ｍｍ长的两种洞缘斜面，４５°、７０°、９０°、弧形四种洞缘角，用３ＭＺ１００树脂和Ｓｐｅｃｔｒｕｍ树脂充填。用５％曙红染料作泄漏试验后，剖开牙齿，观察染料渗入情况。结果：相同洞缘角中，１ｍｍ斜面的染料渗入较２ｍｍ斜面少；相同斜面中，７０°洞缘角染料渗入最少，其次为４５°、弧形、９０°。提示：为了提高树脂修复质量。

On the occlusive surfaces of extracted molars, 1mm and 2mm slopes of cavity margins were designed respectively, and four kinds of angles of cavity margins (45°,70°,90°and arc)were filled ,the cavities were filled with 3M Z100 resin and Spectrum TM resin. After the experiment of micro leakage with 5% eosin dye, the teeth were cut open, the permeation of the dye were observed. The results showed that the dye permeation of 1mm slope was less than that of 2mm slope in the same angles of cavity margins, the dye permeation of 70° cavity margin was the least in the same slope. For other angles , the sequence was 45°,arc and 90°. The study emphasised that the preparation of cavity margin which benefits the fixing of resin fillings was important, in order to improve the quality of the restoration with resin.