title: Effect of trichloromethane on the bond strengths between acrylic teeth and different heat-cured denture bases: a comparative study.
abstract: OBJECTIVE
  This study is to evaluate the role of 1:1 v/v 30% trichloromethane and monomer solvent in enhancing the durability of bonding between cross-linked acrylic teeth and different heatcured denture bases with or without mechanical preparations made on ridge lap portion of the artificial teeth.
  
  
  METHODS
  Two high impact denture base resin materials (Trevalon HI, DeTrey, UK, and DPI Tuff, Mumbai) and one nonhigh impact denture base resin material (DPI Quick Set, Mumbai) were selected to form three groups. Each group contains 30 specimens prepared by five different methods. A mixture of 30% trichloromethane and monomer, mixed in the ratio of 1:1 and applied for 1 minute on the ridge lap area of experimental specimens of methods--B, C, D and E (Specimens of method--A being control group, where no alterations were made at the ridge lap portion of acrylic teeth) before curing. Hounsfield universal testing machine is employed to evaluate the comparative bond strengths.
  
  
  RESULTS
  No significant difference was seen in bond strengths between specimens of experimental methods in all groups. When each group was assessed separately method B specimens in group 1 (739.2 N), group 2 (758 N) and method D specimens in group 3 (729 N) showed highest mean bond strengths. Control group specimens showed the least bond strength (400-460 N) in all groups with more adhesive failures.
  
  
  CONCLUSIONS
  Ridge lap portion of the specimens treated with chemical solvent as in method B showed increased bond strength in groups 1 and 2. Hence, this is a preferred method.
  
  
  CONCLUSIONS
  Evaluation of effect of different chemical and mechanical preparations at the ridge lap areas of acrylic teeth before acrylization helps the clinician and technician to overcome the problem of debonding of teeth from denture bases and in turn provides better quality prosthesis to the patient.
authors: Department of Prosthodontics, KLR's Lenora Institute of Dental Sciences and Hospital, Rajahmundry, Andhra Pradesh, India. jupudy_999@yahoo.com
authors: J S V
authors: JS
authors: Bharat
authors: D Lakshmayya
authors: DL
authors: Naidu
authors: M Venugopal
authors: MV
authors: Reddy
authors: P
authors: P
authors: Naveen
authors: N Venugopal
authors: NV
authors: Rao
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000268:Adhesiveness; D002725:Chloroform / Q000737:chemistry*; D019245:Compressive Strength; D001840:Dental Bonding; D045662:Dental Etching; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003819:Denture Bases; D006358:Hot Temperature; D006801:Humans; D007180:Incisor; D008422:Materials Testing; D008768:Methylmethacrylates / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D012997:Solvents / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D014093:Tooth, Artificial
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; D008768:Methylmethacrylates; D019279:Resin Cements; D012997:Solvents; C094675:Quickset cement; C029883:Trevalon universal; D002725:Chloroform