FO - Faculdade de Odontologia
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Item Reabsorção radicular apical em decorrência do tratamento ortodôntico detectada por meio de tomografia computadorizada de feixe cônico(Universidade Federal de Goiás, 2012-02-17) CASTRO, Iury Oliveira; ESTRELA, Carlos; http://lattes.cnpq.br/3611967334176683Objective: To determine the frequency of apical root resorption in different tooth groups after the end of orthodontic treatment, detected by cone beam computed tomography. Methodology: Images of cone beam computed tomography of 30 patients who had Class I malocclusion and crowding were obtained before and after orthodontic movement. The treatment with fixed appliances was developed based on the Roth prescription. A total of 1256 dental roots were evaluated based on the measurement of linear length between root apex and incisal/cusp. It was an epidemiological, prospective, longitudinal and intra individual study. Results: The mean age of patients was 13 years, 11 were male and 19 female. One hundred percent of the patient presented teeth with apical root resorption, 46% of the roots avaluated was affected. The teeth showed higher extent of apical root resorption were upper lateral incisors, lower lateral, upper central, lower central, upper and lower first molars (p <0.05). By analyzing the roots individually, there was a high frequency of apical root resorption in maxillary central incisors (73%), maxillary lateral incisors (73%), mandibular central incisors (72%), mandibular lateral incisors (70%) and distal roots of mandibular first molar (63%). There was a low frequency of apical root resorption in the buccal roots of the maxillary second premolar (17%), distovestibular and palatine roots of maxillary second molar (18%) and distal roots of mandibular second molar (20%). The results showed that there was no association between frequency of resorption and gender (p> 0.05). The number of resorption did not vary with age when evaluated at age 11 to 16 years (p> 0.05). Conclusion: The apical root resorption was detected in 46% of the roots of teeth submitted to orthodontic treatment, diagnosed by cone beam computed tomography. The most affected teeth were central incisors, lateral and first molars.Item Comparação do comprimento de trabalho do canal radicular usando tomografia computadorizada de feixe cônico, radiografia periapical e localizador apical eletrônico(Universidade Federal de Goiás, 2012-02-13) MORAIS, André Luiz Gomide de; ALENCAR, Ana Helena Gonçalves de; http://lattes.cnpq.br/2039898015468283; ESTRELA, Carlos; http://lattes.cnpq.br/3611967334176683Introduction Strategies to obtain the working length to prepare and fill the root canals has been relevant theme of discussion in endodontics. The purpose of this study was to compare in vivo the canal root working length measures determined by cone beam computed tomography (CBCT) images with the ones obtained by using periapical radiograph and electronic apex locator. Methods The root canal working lengths of 30 single-rooted teeth from 19 patients whose diagnosis was apical periodontitis were evaluated. Initial periapical radiographs for diagnosis and treatment planning, employing the parallelism technique, were taken. CBCT images were acquired with i-CAT system (aiming of diagnosing the cases of apical periodontitis that showed to be complex and doubtful) and measured with specific function of i-CAT software. The coronal opening was made, the root canals were irrigated with sodium hypochlorite solution 2.5%, being performed the exploration and initial emptying of root canal. After, the preparation of the inlet orifice and of the cervical root third was carried out . The minor foramen was located using Root ZX® locator by advancing a stainless steel K-file that best suited the root canal, according to the manufacturer´s instructions. The radiographic measurement was made by advancing a stainless steel K-file in the root canal, until its tip was 1.0 mm from the root apex (determined from the measures obtained by the electronic ape locator). These 3 working length were tabulated and compared. Kruskal-Wallis test was used to analyze the differences between working lengths methods. The significance was set at α=5%. Results The mean values and standard deviations for working length determination by electronic apex locator, periapical radiograph and CBCT images were 21.5 ± 3.1, 21.32 ± 3, 21.4 ± 2.7, respectively. Significant differences were not verified statistically (P>0.05). Conclusions CBCT images working length determination showed to be as similar as the determinations obtained by using periapical radiograph and electronic apex locator.Item Avaliação de erros operatórios durante o preparo do canal radicular após o uso de instrumentos rotatórios de níquel-titânio realizados por estudantes e especialistas(Universidade Federal de Goiás, 2010-02-26) OLIVEIRA, Henrique Cesar Marcal de; ESTRELA, Carlos; http://lattes.cnpq.br/3611967334176683The aim of this study was to determine the errors of procedures that occurred during the preparation of curved root canals after the use of instruments níqueltitânio powered motor managed by specialists in endodontics and dental students. Forty upper and lower molars of humans were randomly divided into two groups of 20, according to traders: G1A-(Molars, specialists in endodontics), G1B-(lower molars, specialists in endodontics), G2A-(molars, dental students), G2B-(lower molars, dental students). The ProTaper Universal System was used to prepare all root canals. The AH PlusTM associated with gutta-percha was used with lateral condensation technique for obturation of all canals. Periapical radiography and cone beam computed tomography (TCFC) were obtained to verify procedural errors occurred during the preparation of root canals. Two examiners evaluated all images for determining the presence or absence of instrument fracture, root perforation (cervical, middle or apical) and deviation original path of the root canal (apical transport). The data were statistically analyzed employing the Chi-square test. The significance level was 5%. The rate of fractured instruments showed no significant differences in the level of experience of operators (p = 1.000). Root perforations and transport apical occurred more frequently in the group of students, without significant differences. While there have been some procedural errors during root canal preparation with experienced and inexperienced operators, the results suggest that the introduction of tools of nickel-titanium engine-driven education