Kusy R P, Whitley J Q
J Biomed Mater Res. 1985 Jan;19(1):35-55. doi: 10.1002/jbm.820190105.
Because replicate materials have requirements different from those of recording or impression materials, quantitative methodologies were sought using commercial impression materials. Two satisfactory objective techniques resulted, a laser-scattering and a capillary flow test. Using high-resolution gratings to stimulate tooth detail (less than 1 micron), the reproduction quality of 36 two-stage replicas was determined in diffraction, reflection, and in an unblazed state. Using precision bore glass tubes (0.25, 0.5, 1, and 2 mm diameters) to simulate the high-energy surface of enamel, the flow characteristics of nine elastomers (the first stage replicates) and four epoxies (the second stage replicates) were determined at isobaric conditions. Because the laser spot size was relatively large (0.6 mm) and the pressure differential was small (25 mm Hg), both the global resolution and the low shear rate characteristics could be measured. Of the commercial materials tested, Reprosil Light had the best combination of fluidity and resolution, regardless of which positive material was used. Although Permagum Low, Silene Wash, and Xantopren Blue scored high in one of the two tests, none of these materials could compare to Reprosil Light within the context described herein.
由于复制材料具有与记录或印模材料不同的要求，因此使用商用印模材料寻找定量方法。产生了两种令人满意的客观技术，即激光散射法和毛细管流动试验。使用高分辨率光栅激发牙齿细节（小于1微米），在衍射、反射和非闪耀状态下测定了36个两级复制品的复制质量。使用精密内径玻璃管（直径0.25、0.5、1和2毫米）模拟牙釉质的高能表面，在等压条件下测定了9种弹性体（第一阶段复制品）和4种环氧树脂（第二阶段复制品）的流动特性。由于激光光斑尺寸相对较大（0.6毫米）且压差较小（25毫米汞柱），因此可以测量整体分辨率和低剪切速率特性。在所测试的商用材料中，无论使用哪种阳模材料，Reprosil Light在流动性和分辨率方面都具有最佳组合。尽管Permagum Low、Silene Wash和Xantopren Blue在两项测试中的一项中得分较高，但在本文所述的情况下，这些材料都无法与Reprosil Light相媲美。
