The effect of storage and curing time on dimensional changesof visible light cured acrylic denture base (VLCADB)
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چکیده
An accurate and stable record bases is needed for recording Maxillio-Mandibular relationship during the construction of a complete denture, toensure this accuracy the record bases should maintain close adaptation to the cast and to be dimensionallystable. Therefore, this study aimed to evaluate the changes of thickness and deformation of visible light cure acrylic denture base (VLCADB)after curing time of two and four minutesand after storage time of two and seven days in water at 23 ± 2 oC. For this purpose 60 specimens of the material were prepared and divided in two groups of 30 each, then each group was divided into three groups of 10 for each (10 specimens control, 10 specimens with two days of storage and 10 specimens with seven days of storage). Measurements of thickness and deformation were recorded pre and post curing of specimens and after storage for for two and seven days in water. The results revealed significant differences in thickness after curing the specimens for twoand fourminutes. Furthermore, storage for twoand sevendays in water showed also significant differences. Also, a significant deformation changes were recorded after curing twominutes and after storage two and seven days.
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