International Journal of Prosthodontics and Restorative Dentistry

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VOLUME 8 , ISSUE 3 ( July-September, 2018 ) > List of Articles


Comparative Evaluation of Effect of Microwave Disinfection on Compressive and Diametral Tensile Strength of Various Type IV Dental Stones–An In Vitro Study

Veronika Dogra, Rajat Dang

Keywords : Compressive strength, Dental stone, Diametral tensile strength, Microwave irradiation

Citation Information : Dogra V, Dang R. Comparative Evaluation of Effect of Microwave Disinfection on Compressive and Diametral Tensile Strength of Various Type IV Dental Stones–An In Vitro Study. Int J Prosthodont Restor Dent 2018; 8 (3):79-83.

DOI: 10.5005/jp-journals-10019-1210

License: CC BY-NC 4.0

Published Online: 05-05-2022

Copyright Statement:  Copyright © 2018; Jaypee Brothers Medical Publishers (P) Ltd.


Aim: To evaluate the effect of microwave disinfection on compressive and diametral tensile strength of various type IV dental stones. Materials and methods: In this study, a total of 160 samples of type IV dental stones were made using elite rock, denflo, Neelkanth and ultrarock each with dimensions of 40 mm in height × 20mm in diameter, which were later tested for compressive strength and diametral tensile strength. Samples were divided into two main groups: group A (compressive strength) and group B (diametral tensile strength) containing 80 samples each. Groups A and B is further divided into 8 subgroups which contain 20 samples each. Each subgroup is further divided into two minor subgroups: control and microwave irradiated containing 10 samples each. The diametral tensile strength and compressive strength of the samples were measured by a universal testing machine after seven times of frequent wetting, irradiating at an energy level of 600 W for 3 minutes and cooling. The data collected was tabulated and was subjected to statistical analysis using Statistical Package for the Social Sciences (SPSS) software. Results: Microwave irradiation resulted in a significant increase in compressive and diametral tensile strength of type IV dental stone. It was seen that out of all materials used, ultrarock was showing the maximum amount of change in both groups (compressive strength and diametral tensile strength). Conclusion: According to the results, microwave irradiation causes a significant increase in compressive strength and diametral tensile strength when compared with the control group.

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