title: Effect of ridge lap surface treatment and thermocycling on microtensile bond strength of acrylic teeth to denture base resins.
abstract: This study evaluated the effect of denture base polymer type (heat- and microwave-polymerized), ridge lap surface treatment (with and without methyl methacrylate-MMA etching) and thermocycling on the microtensile bond strength (microTBS) of Biotone acrylic teeth. Flat-ground, ridge-lap surface of posterior artificial teeth were bonded to cylinders of each denture base resin, resulting in the following groups (n=6): G1a - Clássico/with MMA etching; G1b - Clássico/without MMA etching; G2a - OndaCryl/with MMA etching; G2b - OndaCryl/without MMA etching. Rectangular bar specimens with a cross-sectional area of 1 mm(2) were prepared. Half of the bars in each group were thermocycled (5,000 cycles between 4 degrees C and 60 degrees C). microTBS testing was performed in an universal testing machine at a crosshead speed of 0.5 mm/min. Data were analyzed statistically by three-way ANOVA (alpha=0.05). There was no statistically significant difference (p>0.05) for the factors (resin, surface treatment,and thermocycling) or their interactions. The mean microTBS values (MPa) and standard deviations were as follows: Thermocycling - G1a: 41.00 (14.00); G1b: 31.00 (17.00); G2a: 50.00 (27.00); G2b: 40.00 (18.00); No thermocycling - G1a: 37.00 (14.00); G1b: 43.00 (25.00); G2a: 43.00 (14.00); G2b: 40.00 (27.00). The microTBS of Biotone artificial teeth to the denture base acrylic resins was not influenced by the polymer type, surface treatment or thermocycling.
authors.affiliation: Department of Dental Materials and Prosthodontics, Araraquara Dental School, São Paulo State University, Araraquara, SP, Brazil.
authors.forename: Carolina de Andrade Lima
authors.initials: CA
authors.lastname: Chaves
authors.forename: Rômulo Rocha
authors.initials: RR
authors.lastname: Regis
authors.forename: Ana Lucia
authors.initials: AL
authors.lastname: Machado
authors.forename: Raphael Freitas de
authors.initials: RF
authors.lastname: Souza
mesh_terms: D000180:Acrylic Resins; D001840:Dental Bonding / Q000379:methods*; D045662:Dental Etching; D003799:Dental Stress Analysis; D003819:Denture Bases; D008422:Materials Testing; D011897:Random Allocation; D013499:Surface Properties; D013718:Tensile Strength; D014093:Tooth, Artificial
chemical_list: D000180:Acrylic Resins