World Journal of Dentistry

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VOLUME 11 , ISSUE 2 ( March-April, 2020 ) > List of Articles


An In Vitro Assessment of Physicomechanical Properties of Heat-cured Denture Base Resin Disinfected by Ozonized Water

Reham M Abdallah, Neven S Aref

Keywords : Flexural strength, Microhardness, Ozone, Polymethyl methacrylate, Surface roughness

Citation Information : Abdallah RM, Aref NS. An In Vitro Assessment of Physicomechanical Properties of Heat-cured Denture Base Resin Disinfected by Ozonized Water. World J Dent 2020; 11 (2):146-150.

DOI: 10.5005/jp-journals-10015-1718

License: CC BY-NC 4.0

Published Online: 18-07-2020

Copyright Statement:  Copyright © 2020; Jaypee Brothers Medical Publishers (P) Ltd.


Aim: This study investigates the influence of ozonized water disinfection on flexural strength, surface roughness, and surface microhardness of heat-cured denture base material [(polymethyl methacrylate (PMMA)]. Materials and methods: A total number of 90 specimens were prepared from heat-cured denture base material. In the control group (n = 30), 10 specimens from each test were immersed only in distilled water at 37°C for 48 hours before testing. For the two experimental groups (n = 60), 10 specimens of each group in each test were immersed in 2% chlorhexidine for 10 minutes and another 10 specimens were immersed in ozonized water with a concentration of 10 mg/L for 30 minutes. In the flexural strength test, specimens were subjected to three-point loading at a crosshead speed of 5 mm/minute of a universal testing machine. Hardness measurements using Vickers microhardness tester and roughness measurements by the Surftest analyzer were performed. Measurements of flexural strength, surface roughness (Ra, μm), and hardness (kg/mm2) were analyzed using one-way analysis of variance (ANOVA) and Tukey least significant difference (LSD) test (α = 0.05). Results: Flexural strength values of ozonized water-disinfected specimens were insignificantly decreased. However, the use of ozonized water disinfection significantly increased roughness values. At the same time, microhardness values significantly decreased. Conclusion: The use of ozonized water in disinfecting heat-cured denture base resin did not exhibit a deleterious effect on its strength nor surface roughness. Thus, it may be a much more safe disinfection method rather than chlorhexidine chemical disinfectant. Clinical significance: Disinfection of heat-cured PMMA denture base resin using ozonized water may be a more valuable hygienic method compared to chlorhexidine, the most common chemical disinfectant.

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