Effect of ridge lap surface treatment and thermocycling on microtensile bond strength of acrylic teeth to denture base resins.
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.
Chaves
Carolina de Andrade Lima
CA
Department of Dental Materials and Prosthodontics, Araraquara Dental School, São Paulo State University, Araraquara, SP, Brazil.
Regis
Rômulo Rocha
RR
Machado
Ana Lucia
AL
Souza
Raphael Freitas de
RF
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
D000180:Acrylic Resins