PN0993 - Painel Efetivo
Área: 5 - Dentística

Effect of thiourethane-based silanes on the micro-shear bond strength of dental composites repaired
Borges MG, Fugolin APP, Pfeifer CSC, Vilela ALR, Menezes MS
Dentística e Materiais Odontológicos - UNIVERSIDADE FEDERAL DE UBERLÂNDIA
Conflito de interesse: Não há conflito de interesse

The aim of this study was to evaluate the effect of thiourethane-modified silanes on the micro-shear bond strength of dental composites repaired.Disk specimens (Filtek Supreme A3 Body - 3M ESPE) were sandwiched between glass slides and photo-polymerized for 20 s. The groups were divided according to the silane used in the surface treatment of the composite resin restorations: commercial control (RelyX Ceramic Primer - 3M ESPE), experimental control (3-(trimethoxysilyl)propyl methacrylate), three different thiourethane-silanes synthesized in house (TU: PETMP-BDI, PETMP-HDDI or PETMP-HMDI). For all groups, the silane was added at 2 wt% to 75/25 vol ethanol/water. The surface was roughened and acid etched prior to silane and adhesive application, followed by photo-polymerization for 10 s. Repairs (2 x 2 mm) were built using tygon tubing. Specimens were kept in water for 24 h at room temperature, before being tested for micro-shear bond strength (uSBS) at 0.5 mm/min. Data was analyzed with one-way ANOVA/Tukey's test (95%). There was statistical difference among the groups (p<0.001). The experimental control presented the highest value, statistically similar to the commercial control and the group containing as the TU silane, all statistically similar. All TU-silane groups (PETMP-BDI, PETMP-HDDI and PETMP-HMDI) were statistically lower than the experimental control, but statistically similar to the commercial control.
Thiourethane-silanes may be an alternative with good mechanical and chemical properties for repair of composite restorations.
(Apoio: CAPES  |  NIH  |  Fapemig)

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