Effect of Microwave Disinfection on Compressive and Tensile Strengths of Dental Stones

Journal of Dental Research, Dental Clinics, Dental Prospects

卷:7

Soran Aminifar¹  Elnaz Moslehifard²  Mahmood Robati Anaraki³  Hamed Ghanati⁴ 

[1] Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Kurdistan University of Medical Sciences, Sanandaj, Iran ;

[2] Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran ;

[3] Dental and Periodontal Research Center, Tabriz University of Medical Sciences, Tabriz, Iran;

[4] Undergraduate Student, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran ;

关键词: Compressive strength;    dental stone casts;    microwave disinfection;    tensile strength;   

DOI  :  10.5681/joddd.2013.007

来源: DOAJ

【 摘 要 】

Background and aims. Although microwave irradiation has been used for disinfection of dental stone casts, there areconcerns regarding mechanical damage to casts during the process. The aim of this study was to evaluate the effect of microwaveirradiation on the compressive strength (CS) and diametral tensile strength (DTS) of stone casts.Materials and methods. In this in vitro study, 80 cylindrical type III and IV stone models (20 × 40 mm) were preparedand divided into 8 groups of 10. The DTS and CS of the specimens were measured by a mechanical testing machine at acrosshead speed of 0.5 cm/min after 7 times of frequent wetting, irradiating at an energy level of 600 W for 3 minutes andcooling. Data were analyzed by Student’s t-test.Results. Microwave irradiation significantly increased DTS of type III and IV to 5.23 ± 0.64 and 8.17 ± 0.94, respectively(P < 0.01).Conclusion. According to the results, microwave disinfection increases DTS of type III and IV stone casts without anyeffects on their CS.

【 授权许可】

Unknown