Efeito de diferentes momentos do selamento dentinário na resistência de união à dentina exposta à substâncias químicas auxiliares a endodontia

• Autor(a) principal: Izelli, Thabata Frederico
• Data de Publicação: 2020
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFG
• Texto Completo: http://repositorio.bc.ufg.br/tede/handle/tede/10696
• topic: Microtração; Adesivos dentinários; Endodontia; Soluções irrigadoras; Adesão; Microtensile; Dentin adhesives; Endodontics; Irrigating solutions; Accession; CIENCIAS DA SAUDE::ODONTOLOGIA

Chemical substances used in endodontic treatment can affect the quality of adhesion in the final restoration. The moment of dentin hybridization (HD) can act to minimize the effects of these substances on dentin and influence the quality of adhesion. This study evaluated the timing of HD and different chemical substances in dentin bond strength in human teeth. Twenty human molars were distributed in four experimental groups: G1. RD - direct restoration in composite resin, the control group being without exposure to chemical substances or temporary restoration; G2. HDT - late dentin hybridization with HD at the time of final restoration, after exposure to chemicals and temporary restoration; G3. HDI - immediate dentin hybridization with HD after simulation of endodontic treatment and prior to provisional restoration; G4. HDP - previous dentin hybridization with HD prior to exposure to chemical substances and temporary restoration. The coronary dentin was exposed, submerged with 2.5% sodium hypochlorite, 17% EDTA and endodontic cement, molded with addition silicone, temporarily restored, and stored for 2 weeks in artificial saliva. Then it was restored with composite resin and the microtensile test was performed after 24 hours. The toothpicks were cut to a size of 1mm² and subjected to microtraction at 0.05mm / min (MPa) in the universal testing machine. After assessing normality and homogeneity, the microtensile bond strength values ​​were analyzed using ANOVA, a 5% significance test, followed by a post hoc test (Tukey). The highest bond strength value was found in the control group (42.39 MPa ± 5.69), followed by the HDP group (41.51 MPa ± 3.68), the HDI group (21.16 MPa ± 9.66) and the lowest value in the HDT group (9.86 MPa ± 1.30). The control group (RD) showed no statistically significant difference in relation to the previous dentin hybridization (HDP) approach. The HDI and HDT groups showed a decrease in the tensile strength value when compared to the control group of 76.7% and 50.1%, respectively. It can be concluded that dentin hybridization prior to exposure to chemical substances used in endodontic treatment positively influenced the microtensile bond strength of the studied samples.