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Year : 2007  |  Volume : 7  |  Issue : 1  |  Page : 24-27

Comparative evaluation of dimensional stability of three types of interocclusal recording materials: An in vitro study

Department of Prosthodntics, Meenakshi Ammal Dental College, Chennai, India

Correspondence Address:
K Karthikeyan
Department of Prosthodontics, Meenakshi Ammal Dental College, Allapakkam Main Road, Chennai - 95
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0972-4052.32513

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Statement of Problem : Interocclusal recording materials should have good dimensional stability for precise articulation. Purpose :The aim of this in vitro study was to evaluate and compare the dimensional stability of three types of interocclussal recording materials at various time intervals. Materials and Methods : The materials used in the study were polyvinylsiloxane (Virtual), zinc oxide eugenol paste (Superbite) and Bite registration wax (Alumax). The test was carried out using a mold of the American Dental Association (ADA) specification No. 19. A total of 30 samples were made with each group consisting of ten samples. The samples were measured using an optical microscope with a micrometer provision. The measurements were made at time intervals of 1, 24, 48 and 72 hrs. Results : Five readings were taken for each sample at each time interval and the mean was considered to measure the dimensional change by comparing with that of the original measurement in the die. The results obtained were statistically analyzed using a one-way analysis of variance (ANOVA) and Tukey-(Honestly Significant Differences) HSD test. The mean percentage dimensional change at various time intervals: I) Group A 1 h-0.22%, 24 h-0.48%, 48 h-0.66%, 72 h-0.79%; II) Group B 1 h-0.58%, 24 h-0.93%, 48 h-1.23%, 72 h-1.46% III) Group C 1 h-0.44%, 24 h-0.60%, 48 h-0.77%, 72 h-1.07%, respectively. Group A was dimensionally the most stable of the three groups followed by Group C and then Group B. Conclusion : Dimensional stability is influenced by both the "material" and "time" factors and is found to decrease as the time factor increased. Polyvinylsiloxane (Virtual, Group A) was dimensionally the most stable followed by zinc oxide eugenol paste (Superbite, Group C) and then Bite registration wax (Alumax, Group B).

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