Sayed Mohammed E, Sayed Mohammed E, Al-Makramani Bandar Ma, Al-Sanabani Fuad A, Mohamed Mohamed S
Department of Restorative Dentistry, Rutgers School of Dental Medicine, Rutgers University, Newark, New Jersey, USA.
Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia.
J Contemp Dent Pract. 2016 Sep 1;17(9):734-739. doi: 10.5005/jp-journals-10024-1921.
The aim of this study was to evaluate the effect of intermixing brands of addition silicone impression materials on the dimensional accuracy of stone models using two-step putty-wash technique.
Two common brands of addition silicone impression material (Express and Aquasil) were used in this study. A total of 40 impressions of a stainless steel model simulating a three-unit bridge were made, 10 impressions for each group. Accuracy was assessed by measuring two dimensions (inter-abutment and intra-abutment) on stone models obtained from impressions of the stainless steel model. Each sample was measured thrice and the mean value was calculated. The data were analyzed using analysis of variance (ANOVA) and Scheffe's test.
The results indicated that each of the inter-abutment and intra-abutment dimensions of the stone models was significantly higher than those for the stainless steel model (p < 0.001). However, there was no statistically significant difference in each of the inter-abutment and intra-abutment dimensions of the stone models among the four tested groups (p < 0.05).
The results obtained were statistically analyzed and the values of the inter-abutment and intra-abutment dimensions were all within the clinically acceptable range.
Intermixing brands of additional silicone impression materials evaluated in this study did not affect the dimensional accuracy of obtained stone casts. This will help to minimize the wastage of materials due to lack of either light or putty consistency of the same brand of additional silicone impression material.
本研究的目的是使用两步法的油泥-冲洗技术，评估混合不同品牌加成型硅橡胶印模材料对石膏模型尺寸精度的影响。
本研究使用了两种常见品牌的加成型硅橡胶印模材料（Express和Aquasil）。总共制作了40个模拟三单位桥的不锈钢模型印模，每组10个印模。通过测量从不锈钢模型印模获得的石膏模型上的两个尺寸（基牙间和基牙内）来评估精度。每个样本测量三次并计算平均值。使用方差分析（ANOVA）和谢费检验对数据进行分析。
结果表明，石膏模型的基牙间和基牙内尺寸均显著高于不锈钢模型（p < 0.001）。然而，在四个测试组中，石膏模型的基牙间和基牙内尺寸在统计学上没有显著差异（p < 0.）。
对所得结果进行了统计分析，基牙间和基牙内尺寸的值均在临床可接受范围内。
本研究中评估的混合不同品牌加成型硅橡胶印模材料不会影响所得石膏模型的尺寸精度。这将有助于减少由于同一品牌加成型硅橡胶印模材料缺乏光固化或油泥稠度而导致的材料浪费。
