Gonzalez J B, Chao E Y, An K N
J Prosthet Dent. 1978 Mar;39(3):307-18. doi: 10.1016/s0022-3913(78)80102-4.
The initial results of this study of the physical and mechanical behavior of polyurethanes used for facial prostheses are presented. The parameters studied were surface hardness, modulus of elasticity (M), strength (S), percentage of elongation, and S/M ratio. Results showed that the physical and mechanical behavior of the polyurethanes can be altered by variations in the basic composition of the material accomplished through changes in the ratio of Part A to Part B and by the addition of catalysts. Properties of compositions with low quantities of Part B (isocyanate) and no catalyst reached or approximated those parameters proposed as ideal goals to simulate living tissue. When preparing polyurethane material, proper mixing is essential to avoid entrapment of air and phase separation of the catalyst. These conditions, which may render the prostheses less durable, are masked by the addition of colorants in the prearation of a sample for clinical application.
本文介绍了用于面部假体的聚氨酯物理和力学行为研究的初步结果。所研究的参数包括表面硬度、弹性模量（M）、强度（S）、伸长率百分比以及S/M比。结果表明，通过改变A组分与B组分的比例以及添加催化剂来改变材料的基本组成，可以改变聚氨酯的物理和力学行为。B组分（异氰酸酯）含量低且无催化剂的组合物的性能达到或接近那些被提议作为模拟活组织理想目标的参数。制备聚氨酯材料时，适当混合对于避免空气截留和催化剂相分离至关重要。在制备临床应用样品时添加着色剂会掩盖这些可能使假体耐久性降低的情况。
