title: The bond strength of a highly cross-linked denture tooth to denture base polymers: a comparative study.
abstract: OBJECTIVE
  This study compared shear bond strength and type of bond failure between a highly cross-linked tooth and different denture base polymers.
  
  
  METHODS
  Cross-linked denture teeth were bonded to either a heat-, an auto-, a microwave-polymerized denture base resin or a relatively new injection-molded, microwave-polymerizable polyurethane-based resin. Six experimental groups were established for each of the shear and peel tests. In four of the groups, teeth were used as received and bonded to each of the denture base resins; in the remaining two groups, they were treated with dichloromethane to determine its effect on the bonding with heat or auto-polymerized denture base resins. Bond strength was determined by compressive load applied at 45 degrees on the palatal surface of each tooth until fracture; the type of bond failure was assessed by the peel test.
  
  
  RESULTS
  The results showed that heat-cured PMMA groups failed cohesively and demonstrated significantly higher bond strengths than the other resins used. The application of dichloromethane on the ridge lap areas of teeth resulted in a significant improvement of bond strengths in heat- and auto-cured resins.
  
  
  CONCLUSIONS
  Within the limitations of this experimental study, the results suggest that type of denture base material and processing methods may have an influence upon the bond strength between interpenetrating polymer network (IPN) denture teeth and base materials. Treatment of denture teeth with dichloromethane could provide substantial improvement in the bond strength of teeth with heat and auto-cured denture base resins; however, this finding should be validated in further investigations on the long-term effect of such treatment on the bond strength.
authors.affiliation: Department of Prosthodontics, Faculty oF Dentistry, Gazi University, Ankara, Turkey.
authors.forename: Turan
authors.initials: T
authors.lastname: Korkmaz
authors.forename: Arife
authors.initials: A
authors.lastname: Dogan
authors.forename: Orhan Murat
authors.initials: OM
authors.lastname: Dogan
authors.forename: Hakan
authors.initials: H
authors.lastname: Demir
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D003432:Cross-Linking Reagents; D001840:Dental Bonding; D017005:Dental Debonding; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis; D003819:Denture Bases; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008752:Methylene Chloride / Q000737:chemistry; D008872:Microwaves; D011140:Polyurethanes / Q000737:chemistry; D055116:Self-Curing of Dental Resins; D033081:Shear Strength; D014093:Tooth, Artificial
chemical_list: D000180:Acrylic Resins; D003432:Cross-Linking Reagents; D011140:Polyurethanes; D008752:Methylene Chloride