J Am Dent Assoc. 1990 May;120(5):595-6, 598, 600.
Results of investigations of vinyl polysiloxanes indicate that they produce highly accurate impressions, have excellent elastic recovery, minimal permanent deformation, and adequate tear strength. A number of vinyl polysiloxanes are certified by the American Dental Association. All of these materials provide clinically acceptable results. Advantages of using the vinyl polysiloxanes include the ability of the impression to be poured up after 1 hour or 1 day, or for some products, after 1 week without significant loss of accuracy; the possibility of repouring the impression a second time and producing an accurate cast; the impression materials are available in several viscosities allowing flexibility in choosing an impression technique; and they can be immersed in recommended disinfectants without affecting the accuracy of the impression. The disadvantages of using the vinyl polysiloxanes include a difficulty in lengthening the working time of products without retarders and a high surface tension making it difficult to wet the impression when pouring up a stone cast. Hydrophilic materials appear to facilitate the casting of the impressions with stone. The automixing devices seem to provide convenience without sacrificing the quality of the impression and are currently available for several products. As with all elastomeric impression materials, proper handling is necessary to ensure the best results. The vinyl polysiloxanes seem to be an excellent choice of impression materials for many clinical situations.
乙烯基聚硅氧烷的研究结果表明，它们能产生高度精确的印模，具有出色的弹性恢复、最小的永久变形和足够的撕裂强度。多种乙烯基聚硅氧烷已获得美国牙科协会的认证。所有这些材料都能提供临床可接受的结果。使用乙烯基聚硅氧烷的优点包括：印模在1小时或1天后，或某些产品在1周后仍可灌注，且精度不会有显著损失；可以再次灌注印模并制作出精确的模型；印模材料有多种粘度可供选择，便于灵活选择印模技术；并且它们可以浸泡在推荐的消毒剂中而不影响印模的精度。使用乙烯基聚硅氧烷的缺点包括：对于没有缓凝剂的产品，延长工作时间存在困难；表面张力高，在灌注石膏模型时难以湿润印模。亲水性材料似乎有助于用石膏灌注印模。自动混合装置似乎在不牺牲印模质量的情况下提供了便利，目前有几种产品可供使用。与所有弹性印模材料一样，正确处理对于确保获得最佳效果是必要的。对于许多临床情况而言，乙烯基聚硅氧烷似乎是一种出色的印模材料选择。
