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:: Volume 26, Issue 4 (Winter 2009) ::
J Dent Sch GYEAR__, 26(4): 412-419 Back to browse issues page
Dimensional accuracy of three polyvinyl siloxane putty – wash impression techniques
Farahnaz Nejati danesh Dr., Hani Koopaee Dr., Rasool Moniri Fard Dr., Omid Savabi Corresponding Author: Dr. *1
1- , savabi@dnt.mui.ac.ir
Abstract:   (6834 Views)

Background and Aim: There is much controversy with regard to the effect of the impression technique on accuracy of cast restorations. The aim of this study was to evaluate the accuracy of 3 putty – wash impression techniques using polyvinyl siloxane material.

Materials & Methods: Three putty–wash impression techniques were used for this experimental in vitro study. (1) two-step with 1mm relief (using prefabricated copings for wash space), (2) two-step technique with a polyethylene spacer and (3) one-step. For each technique, 15 impressions were made of a maxillary edentulous model that contained 4 ITI analogue abutments (one with undercut). The impressions were made by standard trays with same space and poured with type IV dental stone. The stone die measurements were made on digital photographs by a computer software. The percentage of dimensional changes of intra abutment (diameter and height) and inter abutment were analyzed by ANOVA, Tukey HSD and t – student tests (α=0.05).

Results: One way analysis of variance showed statistically significant differences among the 3 putty- wash impression techniques, for all measurements(P<0.05). The dimensional changes of technique 1 were significantly less than another two techniques. There were significant differences between height and diameter of the dies with undercut in techniques 2&3 .The diameter of the die was increased in technique 1 and decreased in the other techniques. The height of the dies decreased and the intra abutment spaces increased in all impression techniques. Conclusion: The polyvinyl siloxane 2-step with 1 mm relief putty-wash impression technique was the most accurate for fabricating cast restoration.

J Dent Sch 2008 26(4): 11

Keywords: Dental impression materials, Impression technique, Vinylpolysiloxane, Dental abutments.
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Type of Study: Original Article | Subject: Special
Received: 2006/09/6
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Nejati danesh F, Koopaee H, Moniri Fard R, Savabi O. Dimensional accuracy of three polyvinyl siloxane putty – wash impression techniques. J Dent Sch. 2009; 26 (4) :412-419
URL: http://jds.sbmu.ac.ir/article-1-408-en.html

Volume 26, Issue 4 (Winter 2009) Back to browse issues page
مجله دانشکده دندانپزشکی دانشگاه علوم پزشکی شهید بهشتی Shahid Beheshti University Dental Journal
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