Mestrado em Odontologia (FO)
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Navegando Mestrado em Odontologia (FO) por Assunto "Adesivos dentinários"
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Item Efeito de diferentes momentos do selamento dentinário na resistência de união à dentina exposta à substâncias químicas auxiliares a endodontia(Universidade Federal de Goiás, 2020-03-03) Izelli, Thabata Frederico; Carvalho, Marco Aurélio de; http://lattes.cnpq.br/0482978464903802; Estrela, Carlos; http://lattes.cnpq.br/3611967334176683; Decurcio, Daniel de Almeida; Lazari, Priscilla Cardoso; Estrela, CarlosChemical 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.Item Resistência de união entre cimento resinoso auto-adesivo e dentina selada com adesivo auto condicionante(Universidade Federal de Goiás, 2017-02-23) Leite, Murillo Martins; Torres, Érica Miranda de; http://lattes.cnpq.br/6356663266303896; Lopes, Lawrence Gonzaga; http://lattes.cnpq.br/8698234314492960; Lopes, Lawrence Gonzaga; Torres, Érica Miranda de; Cardoso, Paula Carvalho; Gonçalves, Alberto MagnoThe daily practice of dentists evolves when restorative techniques lead to higher success rates and long-lasting in treatments associated to less invasive procedures. In this context, self-etching adhesives, self-adhesive cements and immediate dentin sealing are examples of modern materials and technique with an uprising popularity among clinicians. The objective of this study was to evaluate the influence of different surface treatment on the sealed dentin with self-etching adhesive on bond strength to a self-adhesive resin. The coronary portions of 90 bovine teeth, included in epoxy resin, were worn out for dentin exposure. The sample was randomly subdivided in six groups. In group C (control) the dentin was kept "fresh" while immediate dentin sealing with Clearfil SE Bond (Kuraray) were performed in the others five groups. After 24 hours of storage, the sealed dentin of the samples received different surface treatments: P group (prophylaxis with pumice); PA group (prophylaxis followed by etching with phosphoric acid); PAS group (prophylaxis, phosphoric acid and silanization); PASC group (prophylaxis, phosphoric acid, silanization and bonding layer of adhesive Clearfil SE Bond) and PAU group [prophylaxis, phosphoric acid and a universal adhesive layer Single Bond Universal (3M ESPE)]. After these protocols, U200 self-adhesive cement (3M ESPE) cylinders were bonded in all six groups, forming an average of 15 sample units per group. The samples were submitted to microshear bond strength test at 0.5mm/min for two storage times: 24 hours (T1) e 3 months (T2). Statistical analysis was carried out using Kruskal-Wallis test, presenting a significant difference between RUM values (p=0.0018) among groups, for 24 hours of storage, and PASC group presented values significantly higher than all other groups. For 3 months of storage, there was no significant difference (p=0,223) between the groups. It is possible to conclude that immediate dentin sealing produced microshear bond strength values similar to control group (as recommended by manufacturer, without immediate sealing), except for the group that associated prophylaxis, phosphoric acid, silane and Clearfil SE Bond that was significantly higher in 24 hours tests, without significant changes with 3 months of storage.Item Avaliação de diferentes sistemas adesivos na resistência de união da dentina após selamento dentinário imediato(Universidade Federal de Goiás, 2019-08-29) Polonial, Isabela Fonseca; Lazari, Priscilla Cardoso; http://lattes.cnpq.br/6893812233431292; Souza, João Batista de; http://lattes.cnpq.br/0642108682158061; Souza, João Batista de; Torres, Érica Miranda de; Cruvinel, DiogoImmediate Dentin Sealing (IDS) decreases postoperative sensitivity, gaps formation and improves bond strength in indirect restorations. The technique suggests the application of a three-step or a self-etch adhesive system immediately dentin exposure. Several adhesive systems are available in market; however, they do not exhibit the same mechanical performance. An alternative that seems to improve bond strength is using a flowable resin layer (Bulk Fill) soon after hybridization. This work evaluated the bond strength of five adhesive systems (Optibond FL, Scotchbond MP, Clearfil SE and Scotchbond U, Adper Single Bond II) with Delayed Dentin Sealing (DDS), IDS or IDS with flowable resin (SDI + F). Once approval was obtained from ethics committee of Federal University of Goiás, seventy-five molars were randomly distributed in fifteen groups (n = 5). The crowns were sectioned in the mesio-distal direction, finished with 600-grit Sic papers for surface regulation and cleaned with pumice and water. Samples with IDS and IDS + F were immediately hybridized after the initial cut, impression taken and stored in artificial saliva for two weeks at 37 °C prior to final restoration (Z100). In samples with DDS, were subjected to the same procedures, however the application of the adhesive system was done after two weeks in artificial saliva at 37ºC. After final restorations, all samples were stored in distilled water at 37 °C for at least 24 hours. Each tooth was cut into beans with thickness of 1mm² cross-section and subjected into universal machine test for microtensile stress in 0,5m/min failure (in MPa). Sealing dentin immediately after cutting significantly improved the adhesion of all tested systems. The use of flowable resin layer after dentin hybridization seems to be an effective technique for different adhesive systems and an alternative to the gold standard Optibond FL.