title: Comparative study of sorption and solubility of heat-cure and self-cure acrylic resins in different solutions.
abstract: OBJECTIVE
  The objective of this study was to compare the sorption and solubility of heat-cure and self-cure acrylic resins in different solutions.
  
  
  METHODS
  One heat-cure acrylic resin (Trevalon) and one self-cure acrylic resin (Rapid Repair) were studied. Five groups of square-shaped specimens (20 mm × 20 mm × 2 mm) were prepared for each acrylic resin and then immersed in five solutions: distilled water, artificial saliva, denture cleansing solution, distilled water, and denture cleaning solution for 12 h alternatively, artificial saliva and denture cleaning solution for 12 h alternatively at 37 ± 2°C, and tested sorption and solubility by weight gain/loss method, respectively, after 1, 6, and 11 weeks. The data were analyzed by one-way analysis of variance followed by post hoc Tukey's test.
  
  
  RESULTS
  Water sorption mean values varied from 17.5 ± 0.88 to 27.25 ± 1.04 μg/mm 3 for heat cure and from 12.75 ± 0.55 to 19.75 ± 1.04 μg/mm 3 for self-cure in the different solutions after different interval periods of 1, 6, and 11 weeks. These values were statistically significant (P< 0.001). Water solubility mean values varied from 0.25 ± 0.55 to 1.5 ± 0.55 μg/mm 3 for heat cure and from 1.5 ± 0.55 to 6.5 ± 0.55 μg/mm 3 for self-cure in the different solutions after different interval periods of 1, 6, and 11 weeks. These values were statistically not significant (P > 0.05). There was no linear correlation between sorption and solubility values. Overall, analysis of results showed the maximum sorption value in denture cleansing solution followed by alternative soaking in distilled water and artificial saliva. Least sorption was observed with artificial saliva followed by distilled water.
  
  
  CONCLUSIONS
  Both heat-cure and self-cure acrylic resins showed varying water sorption and solubility. The results of both water sorption and solubility showed compliance with the International Standards Organization specification. No correlation was found between water sorption and solubility. Artificial saliva solution is a better storage medium than distilled water and denture cleansing solution for both heat-cure and self-cure acrylic resins.
authors.affiliation: Department of Dental Materials, Manipal College of Dental Sciences, Manipal University, Mangalore, Karnataka, India.
authors.forename: Rajesh
authors.initials: R
authors.lastname: Saini
authors.affiliation: Department of Dental Materials, Manipal College of Dental Sciences, Manipal University, Mangalore, Karnataka, India.
authors.forename: Ravindra
authors.initials: R
authors.lastname: Kotian
authors.affiliation: Department of Dental Materials, Manipal College of Dental Sciences, Manipal University, Mangalore, Karnataka, India.
authors.forename: Prashanthi
authors.initials: P
authors.lastname: Madhyastha
authors.affiliation: Department of Oral Pathology, Manipal College of Dental Sciences, Manipal University, Mangalore, Karnataka, India.
authors.forename: N
authors.initials: N
authors.lastname: Srikant
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003820:Denture Cleansers; D006358:Hot Temperature; D008422:Materials Testing; D008768:Methylmethacrylates; D012464:Saliva, Artificial; D012995:Solubility; D012996:Solutions; D014867:Water
chemical_list: D000180:Acrylic Resins; D003820:Denture Cleansers; D008768:Methylmethacrylates; D012464:Saliva, Artificial; D012996:Solutions; D014867:Water; C029883:Trevalon universal