title: Effects of Laboratory Disinfecting Agents on Dimensional Stability of Three Commercially Available Heat-Cured Denture Acrylic Resins in India: An In-Vitro Study.
abstract: BACKGROUND
  Dental professionals are exposed to a wide variety of microorganisms which calls for use of effective infection control procedures in the dental office and laboratories that can prevent cross-contamination that could extend to dentists, dental office staff, dental technicians as well as patients. This concern has led to a renewed interest in denture sterilization and disinfection. Heat polymerized dentures exhibit dimensional change during disinfection procedure.
  
  
  OBJECTIVE
  The purpose of this study was to determine the influence of different types of widely used laboratory disinfecting agents on the dimensional stability of heat-cured denture acrylic resins and to compare the dimensional stability of three commercially available heat-cured denture acrylic resins in India.
  
  
  METHODS
  Twelve specimens of uniform dimension each of three different brands namely Stellon, Trevalon and Acralyn-H were prepared using circular metal disc. Chemical disinfectants namely 2% alkaline glutaraldehyde, 1% povidone-iodine, 0.5% sodium hypochlorite and water as control group were used. Diameter of each specimen was measured before immersion and after immersion with time interval of 1 hour and 12 hours. The data was evaluated statistically using one way analysis of variance.
  
  
  RESULTS
  All the specimens in three disinfectants and in water exhibited very small amount of linear expansion. Among three disinfectants, specimens in 2% alkaline glutaraldehyde exhibited least(0.005mm) and water showed highest (0.009mm) amount of dimensional change. Among resins, Trevalon showed least (0.067mm) and Acralyn-H exhibited highest (0.110mm) amount of dimensional change.
  
  
  CONCLUSIONS
  Although, all the specimens of three different brands of heat-cured denture acrylic resins exhibited increase in linear dimensional change in all the disinfectants and water, they were found to be statistically insignificant.
authors.affiliation: Professor, Department of Prosthodontics, Saraswati Dental College , Lucknow, India .
authors.forename: Jayaprakash Mugur
authors.initials: JM
authors.lastname: Basavanna
authors.affiliation: Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Zawia University , Al Zawia, Libya .
authors.forename: Ravikanth Haridas
authors.initials: RH
authors.lastname: Jujare
authors.affiliation: Dean and Professor and Head, Department of Conservative Dentistry, New Horizon Dental College , Bilaspur, India .
authors.forename: Rana Kalappattil
authors.initials: RK
authors.lastname: Varghese
authors.affiliation: Reader, Department of Prosthodontics, Vananchal Dental College Garhwa, Jharkhand, India .
authors.forename: Vishwa Deepak
authors.initials: VD
authors.lastname: Singh
authors.affiliation: Post Graduate Student, Department of Prosthodontics, Saraswati Dental College , Lucknow, India .
authors.forename: Amit
authors.initials: A
authors.lastname: Gaurav
keywords: Acrylic resin denture; Chemical disinfectants; Cross-contamination; Disinfection; Stability