Effect of microwave disinfection on compressive and tensile strengths of dental stones

Although microwave irradiation has been used for disinfection of dental stone casts, there are concerns regarding mechanical damage to casts during the process. The aim of this study was to evaluate the effect of microwave irradiation on the compressive strength (CS) and diametral tensile strength (...

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Bibliographic Details
Published in:Journal of dental research, dental clinics, dental prospects dental clinics, dental prospects, 2013-01, Vol.7 (1), p.42-46
Main Authors: Robati Anaraki, Mahmood, Moslehifard, Elnaz, Aminifar, Soran, Ghanati, Hamed
Format: Article
Language:English
Subjects:
Compressive strength
dental stone casts
Laboratories
Mechanical properties
Methods
microwave disinfection
Original
Studies
tensile strength
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Summary:Although microwave irradiation has been used for disinfection of dental stone casts, there are concerns regarding mechanical damage to casts during the process. The aim of this study was to evaluate the effect of microwave irradiation on the compressive strength (CS) and diametral tensile strength (DTS) of stone casts. In this in vitro study, 80 cylindrical type III and IV stone models (20 × 40 mm) were prepared and divided into 8 groups of 10. The DTS and CS of the specimens were measured by a mechanical testing machine at a crosshead speed of 0.5 cm/min after 7 times of frequent wetting, irradiating at an energy level of 600 W for 3 minutes and cooling. Data were analyzed by Student's t-test. Microwave irradiation significantly increased DTS of type III and IV to 5.23 ± 0.64 and 8.17 ± 0.94, respectively (P < 0.01). According to the results, microwave disinfection increases DTS of type III and IV stone casts without any effects on their CS.
ISSN:2008-210X
2008-2118
DOI:10.5681/joddd.2013.007