Effect on Working Time of Heat Cure Poly (Methyl Methacrylate) Denture Base Resins at Different Refrigeration Storage Temperatures And Time Intervals - An Invitro Study.
Journal Title: International Journal of Dental Science and Innovative Research (IJDSIR) - Year 2019, Vol 2, Issue 2
Abstract
Background and Objectives: One of the greatest disadvantages of heat cure Poly(methyl methacrylate) resin material is its short working time. Therefore, it is desirable to have long working time for manipulation of acrylic resin, particularly during dough stage. It was hypothesized that refrigeration /freezing the mixed dough prior to packing can extend the working time, without adversely affecting properties of polymerized material. Hence, this invitro study was planned to evaluate the effect of refrigeration on working time of heat cure acrylic resin denture base material, when its polymer and monomer dough mix was stored at different temperatures for different time intervals. Methods: Heat cure acrylic resin was mixed and at dough stage, transferred to deep freezing and normal freezing sections of a refrigerator and frozen for periods of 1 day, 1 week, and 1 month. At the end of the storage times, sufficient dough was removed, thawed and tests were done to compare and evaluate the working time before and after refrigeration. Results: showed that working time of the material increased on storing the heat cure PMMA resin dough at two different temperatures in refrigerator. The working time improved significantly after 1 month’s storage in deep freezer section of the refrigerator as compared to other storage temperatures and time intervals Interpretation and Conclusion: It is concluded that the heat cure denture base resin at dough stage can be stored in deep freezing section of refrigerator up to 1month with a statistically significant increase in working time. But at the same time, the storage of material in normal freezing section of refrigerator up to 1 week showed no statistically significant effect on the working time of heat cure acrylic denture base material.
Authors and Affiliations
Ramakrishna Madathanapalle
Keywords
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