Cullen D R, Sandrik J L
Department of Oral Diagnosis and Radiology, Loyola University, School of Dentistry, Maywood, Ill.
J Prosthet Dent. 1989 Aug;62(2):142-5. doi: 10.1016/0022-3913(89)90300-4.
Numerous factors are known to effect the accuracy of elastomeric impression materials. Factors often overlooked are the quality of the bond between low-viscosity and high-viscosity elastomers and the presumed cohesive bond between materials during an impression reline procedure. This study examined the bond strength of condensation polymerization polysiloxanes, addition polymerization polysiloxanes, polyethers, and a light-cured polyether urethane dimethacrylate. Of the tested materials, light-cured polyether urethane dimethacrylate exhibited the greatest bond strength. The reline technique, light-body cured to previously cured heavy-body putty, yielded results similar to the simultaneous-cure technique. In terms of bond strength there is no advantage of one technique over the other. The corrective reline technique yielded acceptable results in bond strength. In general, the tested materials exhibited greater tensile strength than bond strength.
已知有许多因素会影响弹性印模材料的准确性。常常被忽视的因素是低粘度和高粘度弹性体之间的粘结质量以及在印模重衬过程中材料之间假定的内聚粘结。本研究检测了缩合聚合聚硅氧烷、加聚聚合聚硅氧烷、聚醚以及一种光固化聚醚聚氨酯二甲基丙烯酸酯的粘结强度。在测试的材料中，光固化聚醚聚氨酯二甲基丙烯酸酯表现出最大的粘结强度。轻体固化到先前固化的重体腻子的重衬技术产生的结果与同时固化技术相似。就粘结强度而言，一种技术并不比另一种技术有优势。矫正重衬技术在粘结强度方面产生了可接受的结果。一般来说，测试材料的拉伸强度大于粘结强度。
