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Journal of Dental Materials and Techniques، جلد ۳، شماره ۲، صفحات ۷۷-۸۱
عنوان فارسی The effects of Exposure Times and Light Curing Sources on Surface Micro-Hardness of a Resin Modified Glass Ionomer
چکیده فارسی مقاله
کلیدواژه‌های فارسی مقاله
عنوان انگلیسی The effects of Exposure Times and Light Curing Sources on Surface Micro-Hardness of a Resin Modified Glass Ionomer
چکیده انگلیسی مقاله Introduction: The aim of this study was to evaluate the influence
of different light curing systems and curing times on the micro-hardness of a
resin modified glass ionomer. Methods: Forty two samples of Resin
Modified Glass Ionomer (RMGI) were prepared using stainless steel cylindrical mold
(8 × 2 mm) and randomly divided into six groups of seven. Three groups were
cured with a Quartz Tungsten Halogen (QTH) light cure unit and the other three
groups were polymerized with LED unit for 20, 30 and 40 seconds. All samples
were stored in distilled water for 24 hours. The micro-hardness was measured on
the top and bottom surfaces of the samples by Vickers hardness tester. Data
were analyzed by two–way ANOVA and Tukey’s post-hoc tests. Results: Two-way
ANOVA showed that QTH light-cure unit had higher percentage in depth of cure
than LED light-curing unit in both surfaces; whereas, the application time has
no significant effect on it. There was no interaction between two variables. In
both light-curing groups, the values of top and bottom surfaces micro-hardness
were increased as the application time increased, but there was not any
statistically significant difference among these groups except for 40-second group
of LED light-curing unit which was significantly higher than 20-second and
30-second groups (P<0.05). The micro-hardness value of QTH light-curing unit
was higher than LED light-curing unit. Conclusion: The application of
QTH light-curing unit for at least 20 seconds produces sufficient micro-hardness and depth of cure
of RMGI
کلیدواژه‌های انگلیسی مقاله Glass Ionomer, light curing unit, micro-hardness
نویسندگان مقاله ایمان پریسای | iman parisay
department of pediatric dentistry, mashhad university of medical sciences, mashhad, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (Mashhad university of medical sciences)

زهرا بحرالعلومی | zahra bahrololomi
department of pediatric dentistry, shahid sadoughi university of medical sciences, yazd, iran


مریم غفورنیا | maryam ghafournia
department of pediatric dentistry, esfahan university of medical sciences, esfahan, iran

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

علی اصغر سلیمانی | ali asghar solaimani
department of pediatric dentistry, international branch of tehran university of medical sciences, tehran, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی تهران (Tehran university of medical sciences)

علیرضا boruziniat | alireza boruziniat
restorative dentistry, dental research center, school of dentistry, mashhad university of medical sciences, mashhad, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (Mashhad university of medical sciences)

نشانی اینترنتی http://jdmt.mums.ac.ir/article_2385.html
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