Heisler W H, Tjan A H
Department of Restorative Dentistry, Loma Linda University, School of Dentistry, Calif.
J Prosthet Dent. 1992 Oct;68(4):578-84. doi: 10.1016/0022-3913(92)90369-l.
Combinations of three reversible hydrocolloids with five irreversible hydrocolloids were evaluated for dimensional accuracy and bond strength. A stainless steel model representing two teeth prepared for a fixed partial denture was designed for an accuracy study. The recordings were made with a measuring microscope, and the tensile bond strength was determined with an Instron Universal Testing instrument. The accuracy of these materials was clinically acceptable, and the resulting models were suitable. The materials distributed by a common supplier exhibited better tensile strength, although one irreversible hydrocolloid, Jeltrate, performed well in the noncompanion combination groups. This reversible with irreversible hydrocolloid combination impression has an advantage compared with the traditional reversible hydrocolloid impression, because it does not require elaborate, expensive conditioning equipment and water cooled trays.
对三种可逆水胶体与五种不可逆水胶体的组合进行了尺寸精度和粘结强度评估。设计了一个代表两颗为固定局部义齿制备的牙齿的不锈钢模型用于精度研究。使用测量显微镜进行记录，并用英斯特朗万能测试仪器测定拉伸粘结强度。这些材料的精度在临床上是可接受的，所得模型是合适的。由同一供应商提供的材料表现出更好的拉伸强度，尽管一种不可逆水胶体Jeltrate在非配套组合组中表现良好。这种可逆与不可逆水胶体组合印模与传统的可逆水胶体印模相比具有优势，因为它不需要复杂、昂贵的调温设备和水冷托盘。
