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ORIGINAL RESEARCH Table of Contents   
Year : 2014  |  Volume : 25  |  Issue : 2  |  Page : 184-187
A comparative evaluation of tray spacer thickness and repeat pour on the accuracy of monophasic polyvinyl siloxane impression material: In vitro study


1 Department of Prosthodontics, Jan Nayak Ch. Devi Lal Dental College, Sirsa, India
2 Department of Orthodontics, Inderprastha Dental College, Sahibabad, Uttar Pradesh, India
3 Dental Department, B.K Hospital, Faridabad, India
4 Department of Prosthodontics, DAV Dental College, Yamunanagar, Haryana, India

Correspondence Address:
Sandeep Kumar
Department of Prosthodontics, Jan Nayak Ch. Devi Lal Dental College, Sirsa
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-9290.135916

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Purpose: This study was aimed to determine the effect of various tray spacer thickness and subsequent repeated pours on the accuracy and dimensional stability of the impression made from monophasic polyvinyl siloxane material. Materials and Methods: Custom trays with different spacer thickness (2, 4 and 6 mm) were used for making an impression of a master model simulating 3 unit fixed partial denture with monophasic polyvinyl siloxane material. These impressions were poured with die stone and repoured. Distance between the reference points were measured and subjected to statistical analysis. Result: Casts obtained from 1 st , 2 nd and 3 rd pour of the impression in 2, 4 and 6 mm spacer thickness tray have similar dimensional accuracy amongst each other and with the master model except in molar diameter and inter-abutment distances of cast obtained from 6 mm spacer thickness tray. Conclusion: The vertical distance of stone dies were decreased, whereas horizontal distance increased as the thickness of impression material is increased. There were statistically non-significant changes occurring among the repeated pours in 2, 4 and 6 mm spacer thickness. Clinical Implication: 2 and 4 mm spacer thickness are acceptable for making an impression for three unit fixed partial denture with monophasic polyvinyl siloxane material and it was not affected by two subsequent (1 st and 2 nd ) repeated pours.


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