Teses em Odontologia (Doutorado) - SLMANDIC
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/7406
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Item Acesso aberto (Open Access) Influência de agentes clareadores de uso caseiro e em consultório na resistência de união braquetes ao esmalte em diferentes tempos após clareamento(São Leopoldo Mandic, 2013-05-24) NUNES, Mauro de Amorim Acatauassú; HÖFLING, Roberta Tarkany Basting; http://lattes.cnpq.br/2395614442725255The aim of this study was to evaluate the influence of bleaching agents on the shear bond strength of metal orthodontic brackets to enamel using a resin cementing agent; and fracture mode, at different time intervals after bleaching treatment. One-hundred-and-eighty bovine permanent incisors were sectioned and randomly divided into three groups: Group I - (control): without bleaching. Group 2: bleached with 20% Carbamide Peroxide, (Opalescence® PF) for 21 days, 10 hours/day. Group 3: bleached with 38% Hydrogen Peroxide, (Opalescence® Boost™) in two 15-minute applications every 7 days (for 21 days). After this, the groups bleached were again divided into sub-groups (n=15) according to the time interval after bleaching to perform procedures for bracket bonding to enamel: immediate, 24 hours, 7, 14, 21 and 28 days. The shear bond strength tests were performed in a universal test machine (EMIC) at a speed of 0.5mm/min and the values were recorded in MPa. After, the teeth were examined under a stereoscopic loupe at 40X magnification, to record the Adhesive Remnant Index (ARI). ANOVA showed the technique x time interaction was significant (p=0.0310). Scores were analyzed by Kruskal Wallis and Dunn tests for comparisons between times and Mann Whitney; between techniques, and comparisons with control group. The level of significance considered was 5%. As regards the Group 2, there was no statistically significant difference among time intervals. For the Group 3, there was lower bond strength of brackets to enamel in the immediate time, and this time also differed statistically from that of the Control group. Immediate time did not differ statistically from the times at 14 and 21 days. Times between 1 and 28 days also did not differ statistically among them. The fractures, were a larger number of the cohesive type at the bracket/ orthodontic resin interface. For the group in which 38% Hydrogen Peroxide was used, adhesive fractures in the enamel/ orthodontic resin region were predominant in the immediate time. Use of 20% Carbamide Peroxide, had no influence on the bond strength of orthodontic brackets; whereas the use of 38% Hydrogen Peroxide immediately before bracket bonding reduced the shear bond strength. Performing bracket bonding immediately after conclusion of bleaching treatment must be contra-indicated.Item Acesso aberto (Open Access) Comparação do planejamento em implantodontia por radiografia panorâmica e tomografia computadorizada de feixe cônico(São Leopoldo Mandic, 2017-03-09) ANDRADE, Wagner Almeida de; JUNQUEIRA, José Luiz CintraThe aim of this research was to evaluate the intra-examiner agreement in the planning of implant planning with panoramic radiography and cone beam computed tomography (CBCT). The research was a retrospective study of the 34 patients, in which panoramic radiography and CBCT were evaluated. The sample used in this study was 76 edentulous sites, with one or multiple spaces in different regions of the jaws, which performed the installation of implants. Inclusion criteria were patients attend in the period from 2013 to 2015, with panoramic radiography and CBCT, with the clinical planning, and discussed between students and teachers before the surgical procedure. The follow up of the patients who did not attend the inclusion were excluded. The radiographic and tomographic planning was compared with clinical planing. The experts answered a questionnaire with the indication of the area to be planned and type of implant, according to an interactive catalog. The data were analyzed in a descriptive statistic, and the intraclass correlation coefficient (ICC) was applied to evaluate the similarity between the measurements of the width and length of the implants by the computerized planning and the initial planning. The level of significance was 5%. The results showed that in the radiographic planning, the evaluation of the reproducibility using the CCI, the observed values were considered from average to good in the posterior maxillary. In tomographic planning, the anterior maxillary height coincided with the initial surgical planning; In the evaluation of the plans of the posterior maxillary and height of the posterior mandible, the CCI found were considered satisfactory. It was concluded that there were intra-examiner disagreements in the planning of the initial and tomographic implants. Cone beam computed tomography should be used in implant planning.