Gelbard S, Aoskar Y, Zalkind M, Stern N
Department of Prosthodontics, Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel.
J Prosthet Dent. 1994 Jan;71(1):1-6. doi: 10.1016/0022-3913(94)90246-1.
The effect of two impression materials used in three different techniques was tested for the accuracy of the marginal fit of metal castings. Sixty identically prepared Ivorine teeth were divided into groups of 20. The following methods were selected to make impressions: (1) putty in a metal stock tray with simultaneous elastomeric impression wash, (2) copper band relined with autopolymerizing acrylic resin and subsequent light-body elastomeric impression material, and (3) copper bands with modeling compound. Faciolingual sections of the Ivorine teeth with cemented metal castings were examined by scanning electron microscopy (SEM) at x 100 magnification. Measurements of the thickness of cement layers were calculated both manually and by use of a recently developed computerized method. The differences in the gingival marginal gaps between various impression materials and techniques at both the facial and lingual surfaces were not statistically significant.
测试了两种印模材料采用三种不同技术时对金属铸件边缘适合性的准确性。将60颗制备相同的象牙色牙齿分成每组20颗的组。选择以下方法制取印模：(1)在金属成品托盘里使用赋形膏同时进行弹性印模冲洗，(2)用自凝丙烯酸树脂衬里的铜带及随后的低粘度弹性印模材料，(3)带有模型材料的铜带。对粘结有金属铸件的象牙色牙齿的颊舌向切片在100倍放大倍数下通过扫描电子显微镜(SEM)进行检查。通过手动及使用最近开发的计算机化方法计算粘结层的厚度。不同印模材料和技术在颊面和舌面的牙龈边缘间隙差异无统计学意义。
