Efeito do tratamento de superfície do etileno acetato de vinila na delaminação de protetores bucais customizados

• Ano de defesa: 2023
• Autor(a) principal: Melo, Calebe de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; Brasil; Programa de Pós-graduação em Odontologia
• Palavras-chave em Português: Protetores bucais personalizados; Etileno acetato de vinila; Delaminação; Resistência da ligação laminada; Capacidade de alongamento; Ttratamento de superfície; Custom-fitted mouthguards; Ethylene vinyl acetate; Surface treatment; Delamination; Laminate bond strength; Elongation capacity; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA::MATERIAIS ODONTOLOGICOS; Odontologia; Boca - Dispositivos protetores; Dentes - Cuidado e higiene; Óxido de etileno
• Link de acesso: https://repositorio.ufu.br/handle/123456789/39227; https://doi.org/10.14393/ufu.di.2023.7082

The present study investigated the effect of surface treatment of ethylene vinyl acetate (EVA) on the delamination of custom-fitted mouthguards. Contamination of EVA during mouthguard fabrication can cause delamination. We evaluated the effects of different EVA surface treatments on the contact angle, laminate bond strength, and elongation capacity. Specimens of two bonded EVA plates were prepared (n = 30). The Shore A hardness of standardized EVA plate specimens was measured before and after thermoplasticization. The EVA plates were randomly allocated to one of five different surface treatment groups: no treatment (control); isopropyl alcohol, 100%; chloroform, 99.8%; self-cure acrylic resin monomer (methacrylate, ethylene glycol dimethacrylate, and chemical initiator—amine type); and ethyl alcohol, 70%. The maximum breaking force and elongation at the site of fracture were recorded using a universal testing machine. The contact angle surface was measured using ImageJ software. Scanning electron microscopy of the EVA surface was performed. The laminate bond strength was obtained by dividing the maximum breaking force by the bonding area between the two EVA plates. The laminate bond strength and maximum elongation data were analyzed by one-way ANOVA, followed by the Tukey's and the Dunnet test. The failure mode data was analyzed using the chi-square test (α = .05). Results showed that EVA surface treatment significantly influenced the laminate bond strength and maximum elongation (p <.001). The control group had a higher contact angle and significantly lower laminate bond strength and maximum elongation than the other groups (p < .001). The acrylic resin monomer and chloroform-treated specimens had similar laminate bond strength and maximum elongation. The acrylic resin monomer group had a significantly lower contact angle (p < .001). All treatments had a significantly higher laminate bond strength and maximum elongation than the control group. The acrylic resin monomer and chloroform groups had a significantly higher laminate bond strength and maximum elongation, and the acrylic resin monomer group had a lower contact angle than the other groups. Chloroform should be avoided due to its hazardous effects.