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   effect of different bleaching strategies on microhardness of a silorane-based composite resin  
   
نویسنده bahari mahmoud ,savadi oskoee siavash ,mohammadi narmin ,ebrahimi chaharom mohammad esmaeel ,godrati mostafa ,savadi oskoee ayda
منبع journal of dental research dental clinics dental prospects - 2016 - دوره : 10 - شماره : 4 - صفحه:213 -219
چکیده    Background. dentists’ awareness of the effects of bleaching agents on the surface and mechanical properties of restorative materials is of utmost importance. therefore, this in vitro study was undertaken to investigate the effects of different bleaching strategies on the microhardness of a siloranebased composite resin. methods. eighty samples of a siloranebased composite resin (measuring 4 mm in diameter and 2 mm in thickness) were prepared within acrylic molds. the samples were polished and randomly assigned to 4 groups (n=20). group 1 (controls) were stored in distilled water for 2 weeks. the samples in group 2 underwent a bleaching procedure with 15% carbamide peroxide for two weeks two hours daily. the samples in group 3 were bleached with 35% hydrogen peroxide twice 5 days apart for 30 minutes each time. the samples in group 4 underwent a bleaching procedure with lightactivated 35% hydrogen peroxide under led light once for 40 minutes. then the microhardness of the samples was determined using vickers method. data were analyzed with oneway anova and post hoc tukey tests (p < 0.05). results. all the bleaching agents significantly decreased microhardness compared to the control group (p < 0.05). in addition, there were significant differences in microhardness between groups 2 and 4 (p = 0.001) and between groups 3 and 4 (p<0.001). however, no significant differences were detected in microhardness between groups 2 and 3 (p <0.05). conclusion. bleaching agents decreased microhardness of siloranebased composite resin restorations, the magnitude of which depending on the bleaching strategy used.
کلیدواژه hardness ,silorane composite resin ,tooth bleaching agents
آدرس tabriz of university medical sciences, dental and periodontal research center, faculty of dentistry, department of operative dentistry, ایران, tabriz of university medical sciences, dental and periodontal research center, faculty of dentistry, department of operative dentistry, ایران, tabriz of university medical sciences, faculty of dentistry, department of operative dentistry, ایران, tabriz of university medical sciences, faculty of dentistry, department of operative dentistry, ایران, tabriz of university medical sciences, faculty of dentistry, department of endodontics, ایران, tabriz of university medical sciences, dental and periodontal research center, ایران
 
     
   
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