title: Effect of simulated microwave disinfection on the mechanical properties of three different types of denture base resins.
abstract: BACKGROUND
  Disinfection of prostheses with chemical solutions has deleterious effects on dentures. The appropriate power setting of microwave for disinfection, without affecting denture base properties, is a controversy.
  
  
  OBJECTIVE
  To evaluate and compare the effect of simulated microwave disinfection at a recommended power setting on the mechanical properties of three denture base heat polymerized acrylic resins.
  
  
  METHODS
  Ninety rectangular specimens of each acrylic resin of 65mm × 10mm × 3 mm dimensions were divided into three groups. Group A (Trevalon), Group B (Trevalon- HI), Group C (Ivocap). In each group, thirty specimens were divided into three subgroups with ten specimens in each and they were submitted to MicroVickers hardness, flexural strength, and impact strength tests. In each subgroup, five specimens were tested before the simulated microwave disinfection and they served as the control group. The remaining five were tested after simulated microwave disinfection and they were considered as the experimental group. Simulated microwave disinfection was done in a domestic microwave oven at 650 W for 5 minutes.
  
  
  RESULTS
  The data were analyzed using One-way ANOVA and t-test. The mechanical properties of the three denture base resins were not altered after simulated microwave disinfection, as compared to those of the controls.
  
  
  CONCLUSIONS
  Microwave irradiation at 650 W for 5 min did not affect the mechanical properties of the three denture base resins. Domestic microwave oven, at the prescribed setting, can be used as an alternative method of disinfection for complete dentures without affecting their properties.
authors.affiliation: Senior Lecturer, Department of Prosthodontics, Chhattisgarh Dental College & Research Institute , India .
authors.forename: Jagadish
authors.initials: J
authors.lastname: Konchada
authors.affiliation: Head of the Department, Department of Prosthodontics, Rajah Muthiah Dental College & Hospital , India .
authors.forename: Suma
authors.initials: S
authors.lastname: Karthigeyan
authors.affiliation: Professor, Department of Prosthodontics, Rajah Muthiah Dental College & Hospital , India .
authors.forename: Syed Asharaf
authors.initials: SA
authors.lastname: Ali
authors.affiliation: Senior Lecturer, Department of Prosthodontics, Sree Balaji Dental College , India .
authors.forename: Venkateshwaran
authors.initials: V
authors.lastname: R
authors.affiliation: Associate Professor,Department of Periodontics, Chhattisgarh Dental College & Research Institute , India .
authors.forename: Ramesh
authors.initials: R
authors.lastname: Amirisetty
authors.affiliation: Reader, Department of Prosthodontics, Chhattisgarh Dental College & Research Institute , India .
authors.forename: Anurag
authors.initials: A
authors.lastname: Dani
keywords: Disinfection; Flexural strength; Hardness; Impact strength