کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1423353 986513 2007 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Response to thermal stimuli of glass ionomer cements
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد بیومتریال
پیش نمایش صفحه اول مقاله
Response to thermal stimuli of glass ionomer cements
چکیده انگلیسی

ObjectivesThis study was designed to determine the dimensional changes of glass ionomers caused by thermal stimuli under both dry and wet conditions.MethodsEight cylindrical specimens (6 mm × 4 mm) were made (using a stainless steel mold) of each of the following materials: a conventional luting glass ionomer, two high viscosity restorative glass ionomers, a resin-modified glass ionomer and a resin composite which was used as a control. The thermal expansion characteristics were determined by a thermal mechanical analyzer (TMA) under wet and dry conditions by heating the samples from 25 to 70 °C at 10 °C min−1.ResultsAll materials showed contraction on heating in dry ambient conditions. In wet conditions, all glass ionomers maintained their original dimensions on heating, but the resin-modified glass ionomer expanded. The resin composite showed expansion in both wet and dry conditions. The results are explained in terms of the opposing effects of thermal expansion and desiccation on heating.SignificanceUnder wet conditions glass ionomers maintain their original dimensions when heated. This kind of behavior may be considered as ‘smart’ behavior.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dental Materials - Volume 23, Issue 5, May 2007, Pages 597–600
نویسندگان
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