Evaluation of Relative Accuracy of Three Commercially Available Removable Die Systems of Different Configurations: An in vitro Study

JOURNAL TITLE: Journal of Oral Health and Community Dentistry

Author
1. Shilpi G Gupta
2. Rajendra B Hallikerimath
3. Nirmala Pasam
4. Aman Arora
ISSN
2230-7389
DOI
10.5005/jp-journals-10062-0015
Volume
11
Issue
3
Publishing Year
2017
Pages
7
Author Affiliations
    1. Department of Prosthodontics, Anil Neerukonda Institute of Dental Sciences, Visakhapatnam, Andhra Pradesh, India
    1. Department of Prosthodontics and Crown and Bridge, DAV Dental College and Hospital Yamunanagar, Haryana, India
    1. Department of Prosthodontics, Index Institute of Dental Sciences, Indore, Madhya Pradesh, India
    1. Department of Prosthodontics, Maratha Mandal\'s Nathajirao G. Halgekar Institute of Dental Sciences & Research Centre Belgaum, Karnataka, India
  • Article keywords

    Abstract

    Introduction: The positional shift observed in removable die systems before and after sectioning the master cast may result in a cast restoration with improper occlusal and proximal contacts and marginal fit, thereby requiring time-consuming chairside adjustments. Aim: This study was done to evaluate the relative accuracy of three commercially available removable die systems with different configurations by measuring the average die displacement before and after sectioning of the cast. Materials and methods: A total of 60 impressions were made of the standardized brass master model using polyvinylsiloxane. Impressions were divided into three groups. For each group, a different removable die system was used. Group I: cross pin; group II: M R pin; and group III: conventional brass dowel pin. The presectioning measurement both in the horizontal and vertical directions of all the 60 casts obtained were made using profile projector. The casts were then sectioned and removed and replaced 30 times, and the postsectioning measurements were made using the same references. The differences between the presectioning and the postsectioning measurements were calculated Statistical analysis used: The data were analyzed using analysis of variance (ANOVA) and Tukey's multiple comparison test. Results: All the three die systems exhibited displacement both in the horizontal and vertical directions before and after sectioning the casts. Brass dowel pin exhibited the greatest amount of displacement both in the horizontal and vertical directions. Conclusion: The use of more than one pin and the presence of metallic or plastic sleeves can result in improved accuracy and stability of the die system.

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