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Compressive strength and surface roughness of die stone cast after repeated disinfection with sodium hypochlorite solution

Authors: Sunus Al-Azzawi --- Amer M Khamas عامر خماس --- Jwad Michael جواد مايكل
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2010 Volume: 22 Issue: 3 Pages: 27-33
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The transmission of oral pathogen to impression and subsequently on to gypsum cast has beendemonstrated, and dental stone cast have to be disinfected to prevent the transmission of infectous disease, thisinfection process may affect some physical or mechanical properties of the cast. The aim of the study was toevaluate the compressive strength and surface roughness of type IV dental stone cast after repeated immertion inand sprying using (0.5%) sodium hypochlorite disinfectant solution.Materials and methods: A total of (42test blocks) were prepared and divided to (3) three groups (14each) (controlspray and immersion) for the surface roughness test. These were subdivided into (2) groups (7) each to be testedafter (24 and 48 hours) the same distribution of the test block were followed for the compressive strength test. Foreach test 1/3 of the test black immersed in the disinfectant solution for 30 minutes then allowed 24 hours for be eachdrying this was repeated 5times before being tested, 1/3 of the specimens were sprayed with the disinfectant 5 timesin an interval of 24 hours for bench drying the last 1/3 blokes were the control.Results: Immersing or spraying with hypochlorite solution significantly decreased the compressive strength after 24hours and increased after 48 hours. As for the surface roughness the results showed that both spraying and immersionsignificantly increased the value of the roughness, with immersion as a higher value. Spraying with (0.5%) sodiumhypochlorite solution provide smoother dental stone casts surfaces and adequate compressive strength whenallowed for (48hours) compared to immersion group bench drying.Conclusion: Dental stone casts disinfected by immersion method showed a higher surface roughness than thosedisinfected by spraying.

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