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The effect of four different cooling procedures on the dimensional stability of microwave-activated acrylic resin at different time intervals | ||
| Journal of baghdad college of dentistry | ||
| Article 1, Volume 23, Issue 2, 2011, Pages 1-5 | ||
| Author | ||
| Aseel M. Al- Khafaji | ||
| Abstract | ||
| ABSTRACTBackground: Acrylic denture bases are commonly made of poly methyl methacrylate with different processingmethods such procedure deliver denture with acceptable mechanical properties and certain unavoidabledimensional changes. Several factors may affect final adaptation of the dentures as the type of the acrylic resin, thecooling procedures of the flasks and the water uptake. This study was design to investigate the effect of fourdifferent flask cooling procedure (running water at room temperature for 15 minutes, bench cooling for one hour,bench cooling for four hours and bench cooling for 24 hours) on the dimensional stability of microwave acrylic resinat four different time intervals (immediately, two days, seven days, 30 days) after deflasking.Materials and methods: Microwave-activated acrylic resin (Acron TM MCGC 2AB) was used to prepare (20) acrylicspecimens. Then after curing procedure different ways of flask cooling was applied for cooling the flasks (rapidcooling for 15 minutes, bench cooling for one hour, bench cooling for four hours and bench cooling for 24 hours)then measurement of the distances where achieved between the centers of selected marks in (mm) aftercomputerized scanning of the acrylic specimens at different time intervals (immediately, two days, seven days, 30days) after deflasking for the 4 different methods of flask cooling.Results: The statistical analysis of the results using t test showed that the samples of one hour and four hours benchcooling groups were insignificant difference from the metal pattern at different time intervals. The quenching groupwas significant difference from the metal pattern at all time intervals. And the result of 24 hour bench cooling groupshow a significant difference from the metal pattern at immediate and 2days after deflasking when compared withthe metal pattern while it show insignificant difference from the metal pattern at 7 and 30 days after deflasking.Conclusion: In this study we suggest kept of the microwave acrylic resin in the flask for 1hour and 4hour afterprocessing to obtain accurate and more dimensionally stable dentures.Key words: Dimensional stabilit microwave-activated acrylic resin, flask cooling. (J Bagh Coll Dentistry 2011;23(2):1-5). | ||
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