DeVitre R, Galburt R B, Maness W J
J Prosthet Dent. 1985 Feb;53(2):179-82. doi: 10.1016/0022-3913(85)90104-0.
A biometric comparison of two retraction methods was made on 20 adult patients who received complete crowns. Free gingival tissue height was recorded after 4, 8, and 12 weeks. The conclusions were (1) the electrosurgical method showed more tissue loss at each time interval than the bur method, (2) electrosurgical retraction showed more subject variability than the bur method, (3) clinically, the tissue appearance of both groups was indiscernable at the time intervals tested, and (4) the electrosurgical method provided for a greater bulk of impression material at the margin than the bur method.
对20名接受全冠修复的成年患者的两种牙龈退缩方法进行了生物测量比较。分别在4周、8周和12周后记录游离龈组织高度。结论如下：（1）在每个时间间隔，电刀法比车针法显示出更多的组织损失；（2）电刀牙龈退缩法比车针法显示出更大的个体差异；（3）临床上，在测试的时间间隔内，两组的组织外观无明显差异；（4）电刀法比车针法在边缘处能提供更多的印模材料。
