Influência do uso de duas carbodiimidas na resistência de união de sistemas adesivos universais à dentina

• Ano de defesa: 2018
• Autor(a) principal: Fernandes, Ana Beatriz Franco
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Positivo; Brasil; Pós-Graduação; Programa de Pós-Graduação em Odontologia Clínica; UP
• Palavras-chave em Português: Odontologia; Adesivos dentários; Resinas dentárias; Dentina; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: https://repositorio.cruzeirodosul.edu.br/handle/123456789/2087

The aim of this study was to evaluate the influence of pre-treatment with two crosslinkers on the dentin bond strength of universal adhesive systems, after thermocycling. Ninety-six human molars had their crowns sectioned to expose flat dentin surfaces. Three universal adhesives in the self-etching mode were used (Single Bond Universal, Clearfil Universal and Universal Amber). A self-etching adhesive system (Clearfil SE Bond) was used as control. Two cross-linkers, 1-etil-3-(3’-dimetilaminopropil)-carbodiimida (EDC) and N,N´-dicicloesilcarbodiimmida (DCC), were used prior to the adhesive protocol. Blocks of composite resin were built on the hybridized dentin surfaces, with incremental technique. The specimens were prepared for microtensile bond strength test and were stored for 24 hours in distilled water at 37ºC. In the groups undergoing aging, 10,000 thermal cycles were performed (5oC-55oC, 30s). The microtensile bond strength tests were performed with a universal testing machine with a crosshead speed of 0.5 mm/min. The bond strength data were statistically analyzed using three-way ANOVA (adhesive, cross-linker use and storage time) and Tukey's test with significance level of 5%. For the adhesive system, Single Bond Universal (25.0 ± 10.71 MPa)a obtained the highest bond strength value, followed by Clearfil Universal (21.4 ± 9.92 MPa)b and Clearfil SE Bond (20.7 ± 7.90 MPa)b , which were statistically similar. Ambar Universal (17.33 ± 6.24 MPa)c obtained the lowest bond strength value. For cross-linker use, pre-treatment with EDC obtained the highest bond strength values (22.7 ± 10.21 MPa)a , followed by pre-treatment with DCC and control (no cross-linker), that were statistically similar (20.6 ± 9 , 65 MPa and 20.2 ± 7.88 MPa, respectively)b . With respect to aging, the groups tested after 24h in distilled water presented higher bond strength (22.1 ± 10.26 MPa)a than those submitted to thermocycling (20.2 ± 8.14 MPa)b . It can be concluded that the use of cross-linkers influenced the bond strength values of the adhesives tested, and this was that is dependent on the combination of the adhesive system and the type of carbodiimide. EDC increased the immediate bond strength values only for Clearfil Universal and showed no difference in relation to the control groups for all the adhesives after thermocycling. DCC, after 24h, resulted in increased bond strength only for Ambar Universal; however, after aging, presented significant lower bond strength values compared to control for three of the four adhesives evaluated.