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Made available in DSpace on 2020-12-12T01:41:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-01-01 Objective: The masticatory function is one of the most complex neuropsychological mechanisms in human motor performance and it depends on several factors, such as bite force, muscle coordination, morphology, and number of teeth in occlusion. To evaluate the influence of different rehabilitation treatments such as complete and partial dentures, masticatory forces, and the dynamics of mandibular elevator muscles. Material and Methods: the maximum bite force (force transducer) and electrical activity (superficial electromyography) associated with the masseter and temporal muscles were quantified. These factors were evaluated at rest position and isometric contraction. The data were subjected to descriptive statistics and compared based on the experimental groups, through ANOVA and Tukey’s tests. Results: for bite force, the ANOVA test showed statistical difference between groups and Tukey’s test showed that the force measured in the removable partial dentures group was 44.75% lower than that of the control group, while for complete denture wearers, there was a reduction of 74.4% in bite force in relation to the control group. For electromyographic activity, there was no statistical difference between groups. Pearson’s correlation test (α = 5%) showed positive correlation between the variables of bite force and electromyographic activity only for the control group. Conclusion: it was concluded that the loss of dental elements and their replacement with either partial or complete dentures has a great influence on bite force and electromyographic activity of the masseter and temporal muscles. São Paulo State University (Unesp) Institute of Science and Technology São José dos Campos Department of Restorative Dentistry São Paulo State University (Unesp) Institute of Science and Technology São José dos Campos Department of Dental Materials and Prosthodontics São Paulo State University (Unesp) Institute of Science and Technology São José dos Campos Department of Social Dentistry and Children’s São Paulo State University (Unesp) Institute of Science and Technology São José dos Campos Department of Biosciences and Oral Diagnosis São Paulo State University (Unesp) Institute of Science and Technology São José dos Campos Department of Restorative Dentistry São Paulo State University (Unesp) Institute of Science and Technology São José dos Campos Department of Dental Materials and Prosthodontics São Paulo State University (Unesp) Institute of Science and Technology São José dos Campos Department of Social Dentistry and Children’s São Paulo State University (Unesp) Institute of Science and Technology São José dos Campos Department of Biosciences and Oral Diagnosis

O bjective: This study evaluated the effect of drying times of two total-etch & rinse adhesives on the resin bond strength to a feldsphatic ceramic, before and after aging. Material and Methods: Feldsphatic-ceramic CAD-CAM bars were cut into blocks (12×10×4 mm) with a cutting machine (N = 32). Impressions were made of each ceramic block with silicone putty material and the negative space was filled with a composite resin. The bonding ceramic surface was etched with hydrofluoric acid, silanized, and the adhesive system (SB- Single Bond 2, 3M-ESPE; or PB- Prime & Bond NT, Dentsply) was applied. The samples were dried at different times (5, 10 and 15 s) before the cementation. The resin and ceramic blocks were cemented by a dual cure resin cement. All samples were stored in distilled water at 37 °C for 24 h. For the μ-TBS test, the samples were sliced into microbars. Half of the bars of each block was tested after 24 h and, the other bars were submitted to thermocycling (12,000×) and water storage (150 d) . For the 24 h groups, the longer drying time increased (p < 0.05) the bond strength of SB (water/alcohol adhesive), while reduced (p < 0.05) for the PB group (acetone based adhesive). Results: For the aged groups, the bond strength for the different drying times had no significant difference, for the both adhesives. Conclusion: Longer drying times increased the bond strength values of SB. Smaller drying times increased the bond strength values of PB. The aging protocol influenced the bond strength of SB groups. Keywords: Microtensile; Adhesion; Feldspar ceramic; Drying time; Adhesive system.