Estudo das propriedades de união de um polímero Inorgânico à dentina pelo teste de Push-Out

• Ano de defesa: 2013
• Autor(a) principal: Martins, Iolanda Maria Cariry Lacet de Barros
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraí­ba; BR; Odontologia; Programa de Pós Graduação em Odontologia; UFPB
• Palavras-chave em Português: Adesão; Cimentos odontológicos; Geopolímero; Adhesion; Dentistry cements; Geopolymers; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/tede/6654

The aim of this study was to evaluate the adhesive characteristics of two kinds of geopolymers (G1 and G2) among five well known cements used in Dentistry: two conventional self-cure cements zinc phosphate (FZ), glass ionomer (IV) and three resin -based cements, one of them with light cure RelyX Veneer (RV) whereas the other two are dual cements RelyX ARC (RA) and RelyX U200 (RU), which is a self-adhesive product. Before the execution of the experiments themselves, forty-five non-carious molars were selected for afterwards analysis. The teeth were sectioned along the cervical line, and the crown was split along the mesial-distal line, creating 90 halves of teeth crowns. Each one was placed inside of the lumen of a segment of a regular 25mm PVC pipe. Once that was done, self-cure acrylic resin was poured into the pipes until the full submersion of the half crowns. Each block was transversally sliced, creating specimens in the shape of 2 mm thick discs. Thereupon, conic cavities were drilled into the dentin using a diamond bur. Ten samples were used for each cement and each geopolymer was used in twenty samples. These materials were inserted into these cavities, avoiding their overfill. Randomized 24h storage under relative wetness and room temperature for the selfcure cements and one sample of each geopolymer (G1u and G2u) was set. As a matter of comparison, other ten samples of the geopolymer (G1s and G2s) were stocked in a dry room, for the same period of time, so that it could be possible to analyze its adhesion without the wetness influence. Afterwards, the push-out experiments were made in a universal testing machine. The results were made under the ANOVA and Tukey tests, which showed that the best adhesive strength were showed by G2S and followed by G1S. Among the resin cements, RV obtained the best performance. G1u and G2u showed the lowest adhesive levels, without any relevant statistical differences between them. The conclusion is that the geological cements mechanical characteristics are promising, although they re very susceptible to wetness. The rational application of geopolymers in Dentistry must face an correction of is hidrosolubility, so that its clinical usage can reach a good effectiveness.