Avaliação da resistência de união de um sistema adesivo multi-mode e de um sistema adesivo de condicionamento ácido total aplicado com um novo dispositivo sônico vibratório

• Autor(a) principal: Gimenez, Gino Baraldi [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/149718; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-31/000868337.pdf
• topic: Resistência à tração; Envelhecimento; Dentina; Adesivos dentinários; Tensile strength

Objectives: The aim of this study was to evaluate the microtensile bond strength of a new one-step multimode adhesive (Scotchbond Universal - SU, 3M/ESPE) compared to the total etching adhesive (Ambar - AB, FGM) using a sonic device (Smart Sonic Device - SD) in different dentin conditions: dry (D) and wet (W), etched (E) and non-etched (NE). The effects of thermocycling on the degradation of adhesive-dentine interfaces were also studied. Material and Methods: Ninety-six extracted human molar teeth were divided into 12 groups (n=8) according to the adhesive technique: SU/NE/D, SU/E/D, SU/NE/D/SD, SU/E/D/SD, SU/NE/W, SU/E/W, SU/NE/W/SD, SU/E/W/SD, AB/E/D/SD, AB/E/D, AB/E/W/SD, AB/E/W. Enamel was removed and the middle dentin surfaces were ground with 600-grit SiC paper. Each adhesive system was applied according to the different adhesive techniques, and composite resin blocks (Opallis, FGM) were incrementally built up and stored for 24 hours. Specimens were sectioned into sticks with a cross-sectional area of 0.8mm2. Sticks obtained from each tooth were divided in subgroups and half of them were tested under tension (0.7mm/min) immediately and, the other half resin-dentin sticks were tested after 10.000 thermal cycles (5°C and 55°C). Bond strength data (MPa) were analyzed with the Kruskal-Wallis test, and post hoc comparison was done using the Mann-Whitney U test (alpha=0.05). Results: No significant difference was observed when comparing the application of adhesive systems with sonic device or conventional application, as well as between cycled or non-cycled groups. AB showed lower results compared to the SU, except for the SU/E/W/SD group, which presented similar results to AB. E and NE conditions did not statistically affect the bond strength of SU groups. Dry dentin presented...