Pós-Graduação

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Navegando Pós-Graduação por Assunto "Canal radicular"

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    A influência do acesso minimamente invasivo na instrumentação de canais ovais: análise em microtomografia computadorizada e teste de resistência à fadiga flexural
    (Centro Universitário do Estado do Pará, 2019) Miranda, Ana Raquel Lopes dos Santos; Rodrigues, Patrícia de Almeida; http://lattes.cnpq.br/7995657020175355; Porpino, Mariana Teixeira Maneschy; http://lattes.cnpq.br/5993772430326444; Pessoa, Oscar Faciola; http://lattes.cnpq.br/9576667373951387
    Purpose: The present study evaluated the type of endodontic access cavity would result in greater or lesser touch on the canal walls during instrumentation, and the influence on the instrument's resistance to cyclic flexural fatigue. Methods: Extracted human mandibular incisors with oval-shaped canals were scanned by Micro-computed tomography for sample selection and distribution in two experimental groups (n = 19), according to the test cavity: Group I, minimally invasive endodontic access (MIA) and Group II, conventional endodontic access (CEA). The canals were instrumented with WaveOne Gold Medium system and irrigated with 2.5% NaOCl and 17% EDTA. After rescanning, the untouched areas were measured and analyzed by reconstructing and overlapping the images. Endodontic instruments were subjected to static flexural cyclic fatigue testing using a stainless-steel artificial canal (60° angle and 5mm radius) located 5 mm from the tip. The instruments (n= 7) were rotated to fracture, and the time in seconds to fracture was recorded using a digital timer. The number of cycles to fracture (NCF) was calculated and statistically analyzed. The data obtained in Micro–computed tomography was analyzed by the T test, Mann-Whitney and Wilcoxon tests. For cyclic fatigue data, Tukey's post-test ANOVA was used. A significance level of 5% was adopted for all analyzes. Results: There was no statistical difference between the groups regarding the walls touched and walls untouched by the endodontic instrument in relation to the variation of the access cavities (p> 0.05). The cyclic fatigue resistance test showed no statistical differences between the groups. Conclusion: Within the limitations of the research, the use of minimally invasive cavities did not interfere in the instrumentation of lower incisors with straight and oval canals, and there was no difference in the resistance to flexural fatigue of the instruments against different accesses.
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    O efeito da miliamperagem na detecção do canal mesiopalatino de molares superiores em tomografia computadorizada de feixe cônico
    (Centro Universitário do Estado do Pará, 2018) Ribeiro, Camila Ribeiro; Rodrigues, Patrícia de Almeida; http://lattes.cnpq.br/7995657020175355; Pessoa, Oscar Faciola; http://lattes.cnpq.br/9576667373951387; Tuji, Fabrício Mesquita; http://lattes.cnpq.br/8122254353290848
    Introduction: This study tested the accuracy of the Cone Beam Computed Tomography (CBCT) on the detection of the mesiopalatine canal (MPC) treatment of the first permanent molars after the instrumentation and obturation of the root canals with a variation on the milliamperage (mA) values. Methods: The first twenty first permanent molars were divided, initially, in two groups: I) teeth which had three root canals and II) teeth which had four root canals. The canals were prepared with the Protaper Next system until the instrument X3, irrigated with a sodium hypochlorite solution at 2,5% and endodontically treated by the only beam technique and the AH Plus cement. The MPC of group II was not instrumented nor endodontically treated. The images were acquired using the Pax-I 3D tomograph in two distinct moments, after instrumentation and endodontic treatment applying different mA values: 3mA, 5mA and 10mA. The criteria for the analysis of the images were the CBTC images versus the gold standard (tooth). It was attributed a scale of five points: 1) there is no mesiopalatine canal surely; 2) there is no mesiopalatine canal probably; 3) incertitude; 4) there is a mesiopalatine canal, probably; 5) there is a mesiopalatine canal surely. The agreement inter and intra observer was calculated using the Kappa ratio. The responses were analyzed by the calculation of the curve of characteristic of operation of the receptor (ROC), determining the values of sensibility, specificity and accuracy of the images’ modality. The obtained values were compared by the ANOVA test, adopting 5% as the level of significance. Results: The obtained Kappa values indicated good and excellent agreement intra and inter observer, the area below the ROC curve (ASC) varied from 0.91 to 0.97, sensibility from 8% to 95%, specificity from 70% to 90% and accuracy from 77,5% to 90%. There was no statistic difference between the tested protocols. Conclusion: Within the limits of this study, all the protocols can be applied to the detection of MPC in teeth endodontically treated or nor endodontically treated., being recommended the protocols of a minor dose of radiation.