Marginal Fit of Polymethyl Methacrylate Provisional Restorative Material after Polymerization at Different Water Temperatures and after relining: A Comparative Study
Keywords :
Marginal fit,Polymethyl methacrylate,Storage time
Citation Information :
Khandelwal PV, Roopa K, Vijayalakshmi C. Marginal Fit of Polymethyl Methacrylate Provisional Restorative Material after Polymerization at Different Water Temperatures and after relining: A Comparative Study. CODS J Dent 2016; 8 (1):33-38.
Good fit at the margins of provisional crowns is essential to maintain gingival health and to protect teeth from physical, chemical, bacterial, and thermal injuries. Use of water at the time of curing of provisional crown and relining are advised to get best the marginal fit.
The purpose of this study is to compare marginal fit after complete polymerization at room temperature followed by relining and after polymerization at different temperatures of water of provisional restorative material [polymethyl methacrylate (PMMA)].
Materials and methods
Eight provisional crowns of PMMA for groups A, A1, A2, and A3 were made using a precisely machined brass metal die simulating unprepared tooth and prepared tooth. The marginal fit of provisional crowns measured using stereomicroscope (0.5×10× magnification) at four different points to have 32 measurements in each group in micrometers (μm).
Results and conclusion
Intragroup comparison showed a statistically significant difference in marginal gap of all PMMA at 5 minutes of curing time and 10 minutes of storage time. Order of marginal gap was A3<A1<A2<A. The relining of provisional crowns showed the best marginal fit of all groups.
How to cite this article
Khandelwal PV, Roopa KT, Vijayalakshmi CR. Marginal Fit of Polymethyl Methacrylate Provisional Restorative Material after Polymerization at Different Water Temperatures and after relining: A Comparative Study. CODS J Dent 2016;8(1):33-38.
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