title: The effect of different chemical surface treatments of denture teeth on shear bond strength: a comparative study.
abstract: BACKGROUND
  The development of better cross linked acrylic resin teeth has solved the problems related to wearing and discoloration of acrylic teeth. The same cross linking at ridge lap region acts as a double edge sword as it weakens the bond between denture base and tooth.
  
  
  OBJECTIVE
  The purpose of study was to evaluate the effect of surface treatment on the bond strength of resin teeth to denture base resin using monomethyl methacrylate monomer and dichloromethane with no surface treatment acting as control.
  
  
  METHODS
  Denture base cylinder samples in wax (n=180) were made with maxillary central incisor attached at 450 (JIST 6506). These samples were randomly and equally divided into three groups of 60 each. These specimens were then flasked, dewaxed as per the standard protocol.
  
  
  METHODS
  Before acrylization, ridge lap area was treated as follows: Group A- no surface treatment act as control, Group B treated with monomethyl methacrylate monomer, Group C treated with dichloromethane. Digitally controlled acryliser was used for acrylization as per manufacturer's instructions and shear bond strength was tested on Universal Testing Machine (Servo Hydraulic, 50kN High Strain, BISS Research).
  
  
  METHODS
  Result was statistically analyzed with One-way analysis of variance (ANOVA) and Post-hoc ANOVA Tukey's HSD test at 5% level of significance.
  
  
  RESULTS
  The application of dichloromethane showed increased bond strength between cross linked acrylic resin teeth and heat cure denture base resin followed by monomethyl methacrylate monomer and control group.
  
  
  CONCLUSIONS
  The application of dichloromethane on the ridge lap surface of the resin teeth before packing of the dough into the mold significantly increased the bond strength between cross linked acrylic resin teeth and heat cure denture base resin.
authors.affiliation: Reader, Department of Maxillofacial Prosthodontics and Implantology, Rishiraj College of Dental Sciences and Research Centre , Bhopal, Madhya Pradesh, India .
authors.forename: Gauravi
authors.initials: G
authors.lastname: Jain
authors.affiliation: Professor & Head, Department of Maxillofacial Prosthodontics and Implantology, Modern Dental College & Research Centre , Indore, Madhya Pradesh, India .
authors.forename: Umesh
authors.initials: U
authors.lastname: Palekar
authors.affiliation: Dean & Head, Department of Maxillofacial Prosthodontics and Implantology, Index Dental College & Research Centre , Indore, Madhya Pradesh, India .
authors.forename: Vaibav
authors.initials: V
authors.lastname: Awinashe
authors.affiliation: Reader, Department of Maxillofacial Prosthodontics and Implantology, Rishiraj College of Dental Sciences and Research Centre , Bhopal, Madhya Pradesh, India .
authors.forename: Sunil Kumar
authors.initials: SK
authors.lastname: Mishra
authors.affiliation: Senior Lecturer, Department of Periodontics, Mansarovar Dental College and Research Centre , Bhopal, Madhya Pradesh, India .
authors.forename: Abhishek
authors.initials: A
authors.lastname: Kawadkar
authors.affiliation: Reader, Department of Prosthodontics, Mansarovar Dental College and Research Centre , Bhopal, Madhya Pradesh, India .
authors.forename: Tripti
authors.initials: T
authors.lastname: Rahangdale
keywords: Acrylic resin; Dichloromethane; Monomethyl methacrylate monomer; Shear bond strength