Department of Prosthodontics, AJ Institute of Dental Sciences, Affiliated to Rajiv Gandhi University of Health Sciences, Mangalore, Karnataka, India.
Department of Dental Materials, Manipal College of Dental Sciences, Mangalore, Affiliated to Manipal Academy of Higher Education, Manipal, Mangalore, Karnataka, India.
Indian J Dent Res. 2022 Oct-Dec;33(4):430-434. doi: 10.4103/ijdr.ijdr_1137_21.
Flow characteristics of vinyl polysiloxane (VPS) impression materials are important determinants in the selection of impression materials for the fabrication of accurate indirect restorations.
: The purpose of this study was to determine the flow of three commercially available VPS impression materials at different time intervals using a shark fin device (3M ESPE, Seefeld, Germany).
This in-vitro study was carried out at the prosthodontics department of a dental institution.
The height of the shark fin produced by each impression material determined the rate of flow.
The data were analysed using one-way analysis of variance (ANOVA) and post-hoc Tukey's test (p-0.05).
: Shark fin height of group A VPS impression material was significantly higher at 30 and 120 seconds compared to group B and group C VPS impression materials. Shark fin height produced by group B VPS impression materials at 60 and 90 seconds was significantly higher than the group C VPS impression material but non-significant compared to group A. At 120 seconds, there was no significant difference in the shark fin heights of all the tested materials.
All the materials exhibited adequate flow characteristics within clinically acceptable limits.
乙烯基聚硅氧烷（VPS）印模材料的流动特性是选择用于制作精确间接修复体的印模材料的重要决定因素。
本研究的目的是使用鲨鱼鳍装置（3M ESPE，德国 Seefeld）确定三种市售 VPS 印模材料在不同时间间隔的流动情况。
本体外研究在牙科机构的修复科进行。
每种印模材料产生的鲨鱼鳍的高度决定了流动率。
使用单因素方差分析（ANOVA）和事后 Tukey 检验（p-0.05）对数据进行分析。
在 30 和 120 秒时，A 组 VPS 印模材料的鲨鱼鳍高度明显高于 B 组和 C 组 VPS 印模材料。在 60 和 90 秒时，B 组 VPS 印模材料产生的鲨鱼鳍高度明显高于 C 组 VPS 印模材料，但与 A 组相比无显著性差异。在 120 秒时，所有测试材料的鲨鱼鳍高度没有显著差异。
所有材料均表现出足够的流动特性，在临床可接受的范围内。
