title: Effect of thermocycling on the shear bond strength of different resins bonded to thermoplastic foil applied in occlusal splint therapy.
abstract: OBJECTIVE
  Temporomandibular disorders are a group of symptoms related to the impaired function of the temporomandibular joints and associated muscles. Occlusal splint therapy is a common treatment in the aforementioned syndrome. One of the methods of manufacturing occlusal splints is to place a polymer on thermoplastic foil. The aim of this study was to evaluate the shear bond strength of light- and self-cured resins bonded to thermoplastic foil dependent on artificial aging.
  
  
  METHODS
  Thirty cylinders composed of light-cured resin and 30 cylinders made of self-cured resin were attached to 60 rectangular thermoplastic plates. All specimens were divided into six groups. A control study was conducted for groups 1 and 2. The other preparation groups were subjected to thermocycling by setting appropriately 1000 cycles for groups 3 and 4 and 3000 cycles for groups 5 and 6 in distilled water. Bond strength was measured in a universal testing machine. The results were subjected to statistical analysis using the Mann-Whitney U test (p ≤ 0.05).
  
  
  RESULTS
  The statistics revealed that the values of the shear bond strength for specimens composed of self-cured resin after 1000 and 3000 thermocycles were significantly higher than on those made of light-cured resin (p = 0.003 and p = 0.002).
  
  
  CONCLUSIONS
  The shear bond strength between the self-cured resin and the thermoplastic foil was higher and more resistant to aging than the shear bond strength between the light-cured resin and the thermoplastic foil.
authors.affiliation: Assistant, Division of Dental Materials, Faculty of Dentistry, Wroclaw Medical University, Wroclaw, Poland.
authors.forename: Mieszko
authors.initials: M
authors.lastname: Wieckiewicz
authors.forename: Klaus W
authors.initials: KW
authors.lastname: Boening
authors.forename: Gert
authors.initials: G
authors.lastname: Richter
authors.forename: Wlodzimierz
authors.initials: W
authors.lastname: Wieckiewicz
mesh_terms: D000268:Adhesiveness; D003080:Cold Temperature; D001840:Dental Bonding / Q000379:methods* / Q000706:statistics & numerical data*; D006358:Hot Temperature; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D017090:Occlusal Splints; D011093:Polyethylene Terephthalates / Q000737:chemistry*; D011109:Polymethacrylic Acids / Q000737:chemistry*; D055116:Self-Curing of Dental Resins; D033081:Shear Strength; D013314:Stress, Mechanical
chemical_list: D011093:Polyethylene Terephthalates; D011109:Polymethacrylic Acids
keywords: PMMA; Shear bond strength; artificial aging; light-cured resin; occlusal splint; thermoplastic foil