McCabe J F, Carrick T E
Dental School, University of Newcastle upon Tyne.
Eur J Prosthodont Restor Dent. 2006 Mar;14(1):42-6.
The objective was to assess the ability to accurately record detail on moist surfaces for three elastomeric impression materials derived from different polymers. One polyvinylsiloxane, one polyether and one hybrid material containing a copolymer of siloxane and polyether polymers were used. Impressions were recorded of moist gypsum casts having both a shallow (approximately 20 microm) and deep (approximately 180 microm) groove reproduced on their surface. The grooves in the casts and in the impressions were profiled using a non-contacting laser profilometer Comparisons were made between the groove depths in the casts and impressions (paired t-test). The results indicated that all of the tested materials accurately recorded dimensions in the x-y plane. However, there was evidence that the polyether and hybrid materials were more accurate than the polyvinylsiloxane in recording the true depths of the deep grooves (z plane) under moist conditions. It was concluded that the more hydrophilic nature of the polyether and hybrid materials enabled them to record more accurate impressions of moist surfaces, particularly in areas of difficult access as modelled by the deep grooves.
目的是评估三种源自不同聚合物的弹性印模材料在潮湿表面准确记录细节的能力。使用了一种聚乙烯基硅氧烷、一种聚醚和一种含有硅氧烷与聚醚聚合物共聚物的混合材料。对表面再现了浅（约20微米）深（约180微米）凹槽的潮湿石膏模型进行印模。使用非接触式激光轮廓仪对模型和印模中的凹槽进行轮廓分析。对模型和印模中的凹槽深度进行比较（配对t检验）。结果表明，所有测试材料都能准确记录x-y平面内的尺寸。然而，有证据表明，在潮湿条件下记录深凹槽（z平面）的真实深度时，聚醚和混合材料比聚乙烯基硅氧烷更准确。得出的结论是，聚醚和混合材料的亲水性更强，使它们能够更准确地记录潮湿表面的印模，特别是在深凹槽模拟的难以触及的区域。
