کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1421906 | 986429 | 2011 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: The dimensional stability of impression materials and its effect on in vitro tooth wear studies The dimensional stability of impression materials and its effect on in vitro tooth wear studies](/preview/png/1421906.png)
ObjectivesTo assess the dimensional stability of 8 impression materials over 12 weeks relevant to in vitro tribology studies.MethodsTen impressions from eight impression materials were taken of a metal block (ADA block) conforming to the American Dental Association specification for impression materials and of another metal block (custom block) which allowed measurements over a larger surface area. The impressions and blocks were scanned on a non-contacting laser profilometer (Taicaan® – Southampton, UK) and using surface metrology software Boddies® (Taicaan® – Southampton, UK) measurements were made at 24 h, 2, 4, 8 and 12 weeks. The impression materials tested were [1] Aquasil®, [2] Aquasil® DECA, [3] Affinis®, [4] Express®, [5] Extrude®, [6] Impregum®, [7] President® and [8] Take 1®.ResultsSeven addition silicones and one polyether [6] were tested. [2] and [6] were monophasic, the rest were putty-wash. The results from impressions of the ADA block showed that all materials contracted compared to measurements obtained directly from the block [1] expanded over time (+31.5 μm) (p < 0.05). The results from the custom block showed that all materials contracted compared to direct measurements of the block. [4] and [7] expanded over time (+62 μm and +63.8 μm respectively). [8] contracted over time (−54.7 μm) (p < 0.05).SignificanceNo material showed linear changes >1.5% and were stable for 12 weeks. Nevertheless, the range of changes would affect tribology studies were cut-offs lesser than the reported changes are selected. All impressions should be processed after similar time delays to reduce the errors introduced by dimensional changes.
Journal: Dental Materials - Volume 27, Issue 3, March 2011, Pages 253–258