Effect of thermocycling on the shear bond strength of different resins bonded to thermoplastic foil applied in occlusal splint therapy.
PURPOSE
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.


MATERIALS AND 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).


CONCLUSION
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.
['Wieckiewicz|Mieszko|M|', 'Boening|Klaus W|KW|', 'Richter|Gert|G|', 'Wieckiewicz|Wlodzimierz|W|']
D000268:Adhesiveness D003080:Cold Temperature D001840:Dental Bonding D006358:Hot Temperature D055115:Light-Curing of Dental Adhesives D008422:Materials Testing D017090:Occlusal Splints D011093:Polyethylene Terephthalates D011109:Polymethacrylic Acids D055116:Self-Curing of Dental Resins D033081:Shear Strength D013314:Stress, Mechanical
Shear bond strength thermoplastic foil occlusal splint artificial aging light-cured resin PMMA