• D M Lakshmi, V V Nandini, S N Raj, N H Albar, A Alamoudi, S A Bahammam, B Zidane, H A Bahammam, and S Patil.
• Department of Prosthodontics and Implantology, Private Practitioner (Aluminus of SRM Kattankulathur Dental College), SRM Nagar, Kattankulathur, Tamil Nadu, India.
• Niger J Clin Pract. 2024 Jan 1; 27 (1): 475347-53.

BackgroundOne of the major problems of everyday dental practice is cross-contamination. It can place office personnel, dentists, and patients at risk of acquiring serious illness. Disinfection helps in controlling this cross-contamination to an extent. The evaluation was done to find the efficient disinfection method on gypsum casts.AimsThe aim of this study is to evaluate and compare the efficacy of three methods of disinfection of gypsum casts, namely, chemical disinfection by immersion, spray method, and microwave method, and also to evaluate and compare changes in surface roughness and dimensional accuracy between the three methods after disinfection.Materials And MethodsEx vivo and experimental study. Thirty participants were selected, and impressions of the maxillary arch were made using polyvinyl siloxane impression material. Ninety type IV die stone gypsum casts were poured. It was divided into three groups and was subjected to chemical disinfection by immersion and spray methods, and microwave method. The disinfected casts were evaluated for microbial growth, surface roughness, and dimensional accuracy. It was performed by using the one-way analysis of variance test and paired t-test followed by the Kruskal - Wallis test and Wilcoxon signed rank test (α = 0.05).ResultsMicrowave disinfection was more effective than both immersion and spray chemical disinfection methods (P < 0.010 and <0.001). The surface roughness of the microwave-irradiated casts had significantly increased after disinfection. However, there were no significant dimensional changes by any of the methods of disinfection.ConclusionWithin the limitations of the study, the microwave method of disinfection is more effective in eradicating microorganisms when compared to chemical methods of disinfection by immersion and spray methods.Copyright © 2024 Copyright: © 2024 Nigerian Journal of Clinical Practice.

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