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Journal of Research in Medical Sciences، جلد ۷، شماره ۳، صفحات ۰-۰
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عنوان انگلیسی EFFECTS OF POLISHING TIME AND THERMALCYCLINGON THE MICROLEAKAGE OF FOUR TOOTH –COLOURED DIRECT RESTORATIVE MATERIALS
چکیده انگلیسی مقاله Introdaction. Microleakage has been recognized as a major clinical problem with direct filled dental restorations.The purpose of this study was to investigate and to compare the microleakage of four direct filled tooth-coloured materials, evaluation the effects of polishing time and thermocycling on the microleakage of these materials. Methods. Wedge-shaped class V cavities were prepared on buccal and lingual surfaces of 96 intact extracted human molar teeth. The teeth were randomly divided into three treatment groups and four subgroups. The cavities of each subgroup were filled using one of these materials: a conventional glass ionomer; a resin modified glass ionomer; a composite resin and a compomer. Polishing in the teeth of group 1 was done immediately after placement of restorations and in group 2 one week later. In group 3 delayed polishing and thermocycling (X100) was done. All of the teeth were stored in distilled water for one week and then stained with dye, sectioned, and scored for microleakage on occlusal and cervical edges. Results were statistically analyzed by Kruskal wallis and Mann whitney tests. Results. There was a statistically difference between the microleakage scores of four materials (P < 0.001). Immediately polished glass ionomer and compomer groups have significantly more microleakage than delayed polished groups (P < 0.001). Thermocycting could infulence the microleakage of composite on cervical edges (P < 0.05). Discussion. The precense of differences between the nature of materials and also the surface treatment such as primer or etchant application could influence the microleakage. The prescence of differences in reaction rate between the materials and the time that they reach to their adequate mechanical strength and adhesive bond strength lead to presence of differences between the effect of polishing time on the microleakage scores of materials.
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نویسندگان مقاله وجیه السادات مرتضوی | v mortazavi
department of operative dentistry, school of dentistry, isfahan university of medical sciences and health services

سازمان اصلی تایید شده: دانشگاه علوم پزشکی اصفهان (Isfahan university of medical sciences)

محمد حسین فتحی | m h fathi


h بختیار | h bakhtiar


نشانی اینترنتی http://jrms.mui.ac.ir/index.php/jrms/article/view/3272
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Articles
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