Ghahremanloo Ahmad, Seifi Mahdieh, Ghanbarzade Jalil, Abrisham Seyyed Mohammad, Javan Rashid Abdolah
Associate Professor of Prosthodontics Department, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran.
Assistant Professor of Prosthodontics Department, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran.
J Dent (Tehran). 2017 Jan;14(1):40-47.
The aim of this study was to compare the accuracy of dental implant impressions obtained by a combination of different impression techniques and viscosities of polyvinyl siloxane (PVS).
Four parallel fixtures were placed between mental foramina in a master model of lower dental arch. Three different viscosities (putty/light body, medium body/light body, and monophase: heavy body) and direct and indirect techniques (six groups) were used, and seven impressions were obtained from each group (n=42). To measure the accuracy of impressions, drift, horizontal, and vertical angles of the implants, as well as the hex rotation of the implants in casts were evaluated using a digitizer device (1μm accuracy), in comparison with master arch. Data were analyzed using five-factor two-way ANOVA and Tukey's post-hoc test.
The accuracy of impressions was assessed and the results showed that direct technique was not significantly different from indirect technique (P>0.05). Also, there were no significant differences between the mentioned viscosities except for the horizontal angle (P=0.006).
Viscosity of impression materials is of high significance for the accuracy of dental impressions.
本研究旨在比较不同印模技术与不同粘度的聚乙烯基硅氧烷（PVS）联合使用时获得的牙种植体印模的准确性。
在下颌牙弓主模型的颏孔之间放置四个平行的种植体。使用三种不同的粘度（重体/轻体、中体/轻体和单相：重体）以及直接和间接技术（六组），每组获得七个印模（n = 42）。为了测量印模的准确性，使用数字化仪设备（精度为1μm）评估种植体的漂移、水平和垂直角度以及模型中种植体的六角旋转，与主牙弓进行比较。使用五因素双向方差分析和Tukey事后检验对数据进行分析。
评估了印模的准确性，结果表明直接技术与间接技术之间无显著差异（P>0.05）。此外，除水平角度外，上述粘度之间无显著差异（P = 0.006）。
印模材料的粘度对牙印模的准确性具有重要意义。
