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Article
Effect of Microwave Disinfection on Transverse Strength and Hardness of Acrylic Resin Denture Base Materials

Authors: Ghada Y Abdul-Rahman --- Munther N Kazanji --- Alaa' N Al-Saraj
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 2 Pages: 284-291
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the effect of microwave disinfection on transverse strength and hardness of acrylic resin denture base materials. Materials and methods: The samples were 112 samples (56 heat cured acrylic resin and 56 microwave cured acrylic resin) they were prepared in dimensions of 65± 0.3x10±0.03x2.5 ±0.03 mm (length, width and thickness respectively) for transverse strength test and 30x15x3±0.03 mm (length, width and thickness respectively) for indentation hardness test. The sam-ples were divided into seven disinfection groups; each one contain five samples which were (control, 900 W or 540W for 3min either inside glass flask containing 150 ml of distilled water)or along with glass flask containing 150 ml of distilled water or alone. The collected data were analyzed using analy-sis of variance (one way ANOVA) at P ≤ 0.05 and Duncan's multiple range test. Results: the transverse strength of microwave acrylic resin samples were significantly decreased except samples that disinfect-ed by 540 watt microwave energy for 3 minute with water inside microwave oven. The hardness num-ber for heat cured acrylic denture base showed no significant differences compared to control group while hardness number of microwave acrylic resin were significantly decreased in relation to control group. Conclusions: Transverse strength of microwave acrylic resin that disinfected with microwave was decreased except at 540 watt for 3 minutes with water a side in microwave oven. While heat cured acrylic resin after microwave disinfection was significantly increased compared with the control sam-ple. Rockwell hardness number for microwave acrylic resin significantly decrease in relation to control group; while for heat cured acrylic denture base showed no significancy comparing with the control group.


Article
Denture Disinfection by Microwave at Different Times and Powers

Authors: Ghada Y. Abdul-Rahman --- Munther N. Kazanji --- Alaa' N. Al-Saraj
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: 3 Pages: 100-106
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the best microwave power and the proper time that disinfect acrylic resin denture base material. Methodology: Fifty five samples were prepared from heat cured acrylic resin(10mmx10mmx2mm) then immersed in glass flask containing brain heart broth and inculated with swabs from patients wearing complete denture divided into: negative control group (untreated), positive control group immersed in 0.02% sodium hypochlorite for 8 hours, and nine groups of different microwave disinfection settings (different powers and times),then immersed in sterile BHI broth individually and diluted up to 10-4 and 0.01ml plated in blood agar and Sabouraud's dextrose agar and CFU/ml were collected. Results: analysis of the data showed a significant difference between tested groups. Conclusions: microwave disinfection at 900W and 540W for 3minutes showed both antifungal and antibacterial effect

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