Comparação da resistência de união entre bráquetes ortodônticos metálicos e esmalte dentário utilizando um sistema adesivo universal e um sistema adesivo convencional

• Autor(a) principal: Morato, Thaís Guimarães da Mata
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório do Centro Universitário Braz Cubas
• Texto Completo: https://repositorio.cruzeirodosul.edu.br/handle/123456789/311
• topic: Colagem dentária; Braquetes ortodônticos; Adesivos dentinários; Resistência ao cisalhamento; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA::ORTODONTIA

The objective of this work was to compare the shear bond strenght between dental enamel and metallic brackets using two adhesive systems: conventional fifth generation adhesive system and universal adhesive system. Twenty-three third human molars extracted for orthodontic reasons will be sectioned in the middle in the mesio-distal direction. The sectioned teeth were included in chemically activated acrylic resin with only one enamel face free, where metallic brackets were bonded. The metal brackets were bonded to the enamel surfaces with 37% phosphoric acid etching of the enamel, application of one of the mentioned adhesive systems and composite resin transbond XT. 3 experimental groups were formed (n = 15). Group 1 (Control) was applied phosphoric acid, followed by the application of conventional adhesive system (Transbond XT Light Cure Adhesive Primer) and composite resin (Transbond XT). Group 2 followed the same protocol as Group 1, however the adhesive system used is called Universal (Prime & Bond Universal). Group 3 followed the same protocol as Group 2, however the dental enamel surfaces was not conditioned by phosphoric acid prior to the use of the Universal adhesive system. All specimens manufactured were aged in a bacteriological oven for two months in distilled water at a temperature of 37 ° C. After the aging period, the specimens were subjected to the shear bond strength test using a stainless steel wire with a loading speed of 1 mm / min. The obtained data was submitted to statistical analysis ANOVA 1 factor and Tukey test (α = 0,05). According to the results, it was found that group 3 (2.29 ± 1.58 MPa) has the lowest bond strength values when compared to groups 1 (12.31 ± 3.23 MPa) and 2 (11 , 78 ± 2.76 MPa). It was concluded that acid etching significantly increases the bond strength between the universal adhesive and dental enamel, and this should be the protocol used for bonding metal brackets in dental enamel.