Cumulative effect of disinfection procedures on microhardness and tridimensional stability of a poly(methyl methacrylate) denture base resin.
作者： Evandro Afonso Sartori , Caroline Bom Schmidt , Eduardo Gonçalves Mota , Luciana Mayumi Hirakata , Rosemary Sadami Arai Shinkai
DOI: 10.1002/JBM.B.31027
关键词:
摘要: Microwave irradiation has been used for disinfection of dentures instead chemical solutions; yet, its effect on resin properties after repeated procedures still is unclear. This study evaluated the cumulative two methods Knoop microhardness and tridimensional stability a poly(methyl methacrylate) denture base resin. For measurement, 24-resin discs received mechanical polishing were submitted to following treatments: (1) control (no disinfection), (2) (immersion in 100ppm chloride solution 24h), or (3) microwave (irradiation at 690 W 6 min). Disinfection performed twice (T1, T2) with 7-day interval. was recorded (T0) T1 T2. dimensional test (measured by adaptation bases), 36-maxillary bases obtained from type III dental stone casts duplicated metallic master model treatment. Adaptation measured baseline T2 weighing vinyl polysiloxane film reproducing gap between model. Data analyzed ANOVA GLM measures Bonferroni's test, alpha = 0.05. not modified any procedure but decreased over time. Denture had gradual increase distortion time, while immersed did differ group remained dimensionally stable
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