Richmond R, Macfarlane T V, McCord J F
The University Dental Hospital of Manchester, Higher Cambridge Street, M15 6HF Manchester, UK.
Dent Mater. 2004 Feb;20(2):124-32. doi: 10.1016/s0109-5641(03)00083-6.
The objective of this study was to evaluate the abrasion resistance and surface roughness of two injection-molded poly(methylmethacrylate) denture base materials (SR-Ivocap 'Plus', Ipsyl 60 RV), and also one compression-molded material (Trevalon). A fourth group of specimens (prepared from Trevalon using the injection-molding procedure) was compared to the compression-molded specimens.
Ten specimens were prepared according to manufacturers' instructions. An experiment involving toothbrush and dentifrice abrasion was performed on all specimens from each of the materials and the cumulative percentage weight-loss was calculated after 100,000 brush strokes. A series of surface roughness profile measurements were also obtained from each specimen within the groups. The data were analysed by using the Kolmogorov-Smirnov test. A level of significance of 0.017 was set in order to adjust for multiple comparisons between the three sets of materials.
There was found to be no statistically significant difference between the three groups of materials in terms of percentage weight-loss, and no statistically significant difference between the Trevalon specimens when injection-molded or compression-molded. In terms of surface roughness, however, SR-Ivocap 'Plus' recorded the lowest surface roughness profile of the three groups. It was found that there was a statistically significant difference (P<0.017) between this material and Ipsyl RV 60 (producing the highest roughness), and compression-molded Trevalon. Furthermore, there was found to be no statistically significant difference between injection-molded and compression-molded specimens of Trevalon with regard to surface texture.
From a clinical standpoint, the surface roughness results suggest SR-Ivocap 'Plus' to be the material most likely to produce the least suitable substrate for the accumulation of denture plaque.
本研究的目的是评估两种注塑成型的聚甲基丙烯酸甲酯义齿基托材料（SR-Ivocap“Plus”、Ipsyl 60 RV）以及一种模压成型材料（Trevalon）的耐磨性和表面粗糙度。将第四组标本（使用注塑成型工艺由Trevalon制备）与模压成型标本进行比较。
根据制造商的说明制备10个标本。对每种材料的所有标本进行涉及牙刷和牙膏磨损的实验，并在100,000次刷牙后计算累积重量损失百分比。还从每组中的每个标本获得了一系列表面粗糙度轮廓测量值。使用Kolmogorov-Smirnov检验分析数据。为了调整三组材料之间的多重比较，设定显著性水平为0.017。
发现三组材料在重量损失百分比方面没有统计学上的显著差异，并且Trevalon标本在注塑成型或模压成型时也没有统计学上的显著差异。然而，就表面粗糙度而言，SR-Ivocap“Plus”记录了三组中最低的表面粗糙度轮廓。发现该材料与Ipsyl RV 60（产生最高粗糙度）和模压成型的Trevalon之间存在统计学上的显著差异（P<0.017）。此外，发现Trevalon的注塑成型标本和模压成型标本在表面纹理方面没有统计学上的显著差异。
从临床角度来看，表面粗糙度结果表明SR-Ivocap“Plus”是最不可能产生最不适合义齿菌斑积聚的基质的材料。
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