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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
51

Avaliação da reabsorção radicular externa consecutiva ao uso do Sistema Autoligável Damon / Evaluation od external root resorption consequent to the use of self-ligated damon system

Roberta Heiffig Handem 30 January 2013 (has links)
A reabsorção radicular apical constitui um efeito indesejável, porém frequente, do tratamento ortodôntico e por este motivo, várias técnicas e materiais, tal como o aparelho autoligável Damon têm sido desenvolvido visando facilitar a prática clinica e diminuir esse efeito deletério. O propósito deste estudo foi comparar o grau de reabsorção radicular externa em casos tratados com o aparelho autoligável Damon e com o aparelho pré-ajustado convencional. A amostra constitui de 52 casos, sendo 25 do grupo 1, tratados com o aparelho autoligável Damon, com idade média inicial de 16,04 anos e idade média final de 18,06 anos e com tempo de tratamento médio de 2,02 anos; e 27 do grupo 2, tratados com o aparelho pré-ajustado convencional, com idade média inicial de 16,77 anos, idade média final de 18,47 anos e com tempo de tratamento médio de 1,70 anos. Foram avaliadas as radiografias periapicais dos incisivos superiores e inferiores ao final do tratamento ortodôntico. Os dois grupos foram compatibilizados quanto às idades inicial e final, tempo de tratamento, distribuição por gêneros, tipo de má oclusão e protocolo de tratamento sem extrações. A reabsorção radicular foi avaliada pelo escore de Levander e Malmgren. Os dados relacionados à reabsorção radicular foram comparados pelo teste não paramétrico de Mann-Whitney. Os resultados mostraram que não houve diferença significante nos graus de reabsorção radicular entre os dois grupos. Graus de reabsorção radicular semelhantes podem ser esperados ao final do tratamento com o aparelho autoligável Damon e o aparelho pré-ajustado convencional. / The apical root resorption is an undesirable effect, but frequent in orthodontic treatment and for this reason, several techniques and materials, such as self-ligated Damon appliance have been developed to facilitate clinical practice and decrease it. The purpose of this study was to compare the degree of external root resorption in patients treated with the self-ligated Damon appliance and the conventional preadjusted appliance. The sample comprised 52 cases, 25 in group 1, treated with the self-ligated Damon appliance, with mean initial age of 16.04 years, mean final age of 18.06 years, and mean treatment time of 2.02 years; and 27 in group 2, treated with the conventional preadjusted appliance, with a mean initial age of 16.77 years, mean final age of 18.47 years and mean treatment time of 1.70 years. It was evaluated the periapical radiographs of the maxillary and mandibular incisors at the end of orthodontic treatment. The two groups were matched regarding the initial and final ages and treatment time, gender distribution, type of malocclusion and treatment protocol without extractions. The root resorption was assessed by the score of Levander and Malmgren. Data related to root resorption were compared by the nonparametric Mann-Whitney test. The results showed no significant difference in the degree of root resorption between the two groups. Similar degrees of resorption can be expected after the treatment with the Damon self-ligated appliance and the conventional preadjusted appliance.
52

‘Recommendations for the development of a framework for radiological imaging studies during implant therapy in SA’

Beshtawi, Khaled Raed January 2021 (has links)
Philosophiae Doctor - PhD / Radiographic examination is an essential facet of dental implant therapy, and the success of this therapy depends on a suitable treatment based on adequate clinical and radiographic information. International organisational bodies have published guidelines on the use of radiographic imaging during implant therapy, but since the cone beam computed tomography modality became available, a need for the development of comprehensive imaging guidelines to limit the misuse of this modality became necessary. There is a lack of stringency regarding the recommendations and guidelines on radiographic imaging modalities used during implant therapy. This is due to variations in practice, experience, and socioeconomic factors. The most recent published global guidelines and recommendations and their relevance to dental implant therapy are described in this chapter.
53

Effect of image variation on computer aided detection systems / Betydelsen av normalisering av bilder vid datorstödd bildanalys

Rabbani, Seyedeh Parisa January 2013 (has links)
Computer Aided Detection (CAD) systems are expecting to gain significant importance in terms of reducing the work load of radiologists and enabling the large screening programs. A large share of CAD systems are based on learning from examples, to enables the decision making between the images with or without disease. Images are simplified to numerical descriptors (features vectors) and the system is trained with these features. The common practical problem with CAD systems is training the system with a data from a specific source and testing it on a data from a different source; the variations between sources usually affect the CAD system function. The possible solutions for this problem are (1) normalizing images to make them look more equal, (2) choosing less variation sensitive features and (3) modifying the classifier so that it classifies the data from different sources more accurately. In this project the effect of image variations on the developed CAD system on chest radio graphs for Tuberculosis is studied at Diagnostic Image Analysis Group. Tuberculosis is one of the major healthcare problems in some parts of the world (1.3 million deaths in 2007) [1]. Although the system has a great performance on the train and test data from the same source, using different sub dataset for training and testing the system does not lead to the same result. To limit the effect of image variation of the CAD systems three different approaches are applied for normalizing the images: (1) Simple normalization, (2) local normalization and (3) multi band local normalization. All three approaches enhance the performance of the system in case of various sub datasets for training and testing purposes. According to the improvement achieved by applying normalization it is suggested as a solution for the stated problem above. Although the outcome of this study has satisfactory result, there is always room for further investigations and studies; in specific testing different approaches for finding less variation sensitive features and modifying the classification procedure to a more variation tolerant process.
54

The evaluation of the reliability of radiographic features using CBCT and periapical radiographs in the differential diagnosis of periapical lesions

Penberthy, Skylar Montana Grizzly 21 June 2022 (has links)
INTRODUCTION: The diagnosis and treatment of endodontic infections is a multi-step fact gathering process, with the gold standard of periapical lesion diagnosis being histological biopsy. With common diagnoses, such as periapical granulomas and radicular cysts, representing the bulk of biopsies, the possibility of a less invasive method of lesion identification ought to be examined. In recent years Cone Beam Computed Tomography (CBCT) imaging has been proposed as a potential diagnostic tool for periapical diagnosis, but this theory requires further testing and data in order to verify its appropriateness. OBJECTIVE: The aim of this study was to evaluate six criteria used for assessing periapical lesions of teeth seen on CBCT scan from the textbook Oral Radiology White and Pharoah. MATERIAL AND METHODS: Three blinded endodontists observed radiographic features of oral periapical lesions of teeth previously diagnosed as either radicular cysts or periapical granulomas via histological biopsy. All lesions had previously been scanned via CBCT, and endodontic apical surgery was performed allowing for a pathology sample of the lesion. The observers viewed 40 CBCT and 40 corresponding periapical (PA) radiographic images, all randomized, and reported which of the six criteria (Location- apex of tooth, periphery- corticated border, shape- curved or circular, internal structure- radiolucent, effects on surrounding structures- displace or resorb roots, corticated plate perforation- present) were present in the scans. Data was analyzed using a Logistical Regression Fleiss Kappa statistic with a 95% confidence level. RESULTS: CBCT cyst showed no agreement between examiners criteria selected to statistical significance. The most selected criteria by all examiners were shape and internal structure. PA radiographic Cyst showed moderate agreement for ‘Location’ and ‘Periphery’ and substantial agreement on ‘none’ criteria. The most selected criteria by all examiners were internal structure and location. CBCT Granuloma showed moderate agreement for ‘location’ and perfect agreement for ‘none’. The most selected criteria by all examiners were shape, location, and internal structure. PA radiographic Granuloma showed substantial agreement for ‘periphery’ and moderate agreement for internal structure (radiolucency). The most selected criteria by all examiners were location, and occasionally shape and internal structure. Logistic regression of selected criteria shows with each additional criteria present on each lesion the chance of the lesion being a granuloma decreases 24.9% on PA radiographs and 33.9% on CBCT images. CONCLUSION: The current study shows an inter-examiner agreement of moderate to perfect kappa statistic does not align with the most commonly selected criteria among examiners, showing poor examiner agreement among lesions. / 2024-06-21T00:00:00Z
55

Developing a highly accurate, locally interpretable neural network for medical image analysis

Ventura Caballero, Rony David January 2023 (has links)
Background Machine learning techniques, such as convolutional networks, have shown promise in medical image analysis, including the detection of pediatric pneumonia. However, the interpretability of these models is often lacking, compromising their trustworthiness and acceptance in medical applications. The interpretability of machine learning models in medical applications is crucial for trust and bias identification. Aim The aim is to create a locally interpretable neural network that performs comparably to black-box models while being inherently interpretable, enhancing trust in medical machine learning models. Method An MLP ReLU network is trained with Guangzhou Women and Children's Medical Center pediatric chest x-ray image dataset and utilize Aletheia unwrapper for interpretability. A 5-fold cross-validation assesses the network's performance, measuring accuracy and F1 score. The average accuracy and F1 score are 0.90 and 0.91, respectively. To assessthe interpretability results are compared against a CNN network aided with LIME and SHAP to generate explanations. Results Despite lacking convolutional layers, the MLP network satisfactorily categorizes pneumonia images and explanations align with relevant areas of interest from previous studies. Moreover, by comparing it with a state of the art network aided with LIME and SHAP explanations, the local explanations demonstrate to be consistent within areas of the lungs while the post-hoc alternatives often highlighted areas not relevant for the specific task. Conclusion The developed locally interpretable neural network demonstrates promising performance and interpretability. However, additional research and implementation are required for it to outperform the so-called black box models. In a medical setting, a more accurate model despite the score could be crucial, as it could potentially save more lives, which is the ultimate goal of healthcare.
56

Methodological approaches to evaluating the practice of radiographers' interpretation of images: A review

Brealey, S., Scally, Andy J. January 2008 (has links)
Recent initiatives to modernise the National Health Service describe how improving pay structures and staff working lives can be achieved in the form of advanced practitioner and consultant posts. Role development in Radiography represents a fundamental change to professional practice of radiographers and is subject to the provisions of the statutory and professional codes of conduct which govern such practice. In Diagnostic Radiography the response to Government initiatives has led to a change in practice so that radiographers in these new posts provide reports for a variety of imaging modalities. At the same time as there have been changes in the practice of Radiography, the discipline of evidence-based medicine has emerged. Changes in clinical practice should be underpinned by evidence from research. The purpose of this paper is to discuss the methodological approaches used to conduct research that evaluates one of the most salient areas of development in Radiography practice, that is the role of radiographers as advanced or consultant practitioners when interpreting plain radiographs. We begin by discussing what an evaluation is and two broad approaches for conducting health services research, and then appraise the evidence about radiographer reporting in the context of these methods of evaluation. We then suggest future considerations about the methodological approaches to evaluating radiographer reporting practice and identify where there are evidence gaps and the need for further research to inform evidence-based Radiography.
57

Estimativa da idade em adultos por meio do estudo de radiografias periapicais / Age estimation in adults using periapical radiographs

Azevedo, Alana de Cassia Silva 08 August 2013 (has links)
As mudanças nas dimensões da cavidade pulpar, decorrentes do depósito de dentina secundária, representam o melhor parâmetro morfométrico para estimativa da idade em adultos através de imagem radiográfica. Nesse sentido, os objetivos deste estudo foram: avaliar a acurácia e precisão da estimativa da idade com base na relação entre a polpa e a o dente canino através da análise de radiografias periapicais, e construir fórmulas para a estimativa da idade de adultos brasileiros, além de compará-las com as fórmulas elaboradas para outras populações. A amostra foi composta por 1.772 radiografias periapicais pertencentes a 443 sujeitos (sexo masculino: 219; sexo feminino: 224), sendo estes organizados em 12 grupos de acordo com o sexo (masculino ou feminino) e faixa etária (20 a 29 anos, 30 a 39 anos, 40 a 49 anos, 50 a 59 anos, 60 a 69 anos e 70 ou mais). A análise das radiografias foi pautada na proposta de Cameriere et al. (2004a) em que se utiliza o software Adobe Photoshop® para análise das radiografias periapicais e definição dos 20 pontos no contorno da estrutura dentária do dente canino e 10 pontos ao redor da cavidade pulpar Em seguida, obteve-se os valores em pixels a serem inseridos nas fórmulas de estimativa da idade. Ao desenvolver e aplicar as fórmulas para a população brasileira obteve-se: erro médio igual a 8,56 (DP= 5,80) anos para o dente 13, para o dente 23 o erro médio foi igual a 7,99 (DP = 5,78) anos, para o dente 33 o valor do erro médio foi de 8,38 (DP = 6,26) anos e para o dente 43 o erro médio foi igual a 8,20 (DP = 6,54) anos. Ao utilizar a fórmula com a associação de dentes, o valor referente ao erro médio diminuiu e foi de 7,85 (DP = 5,60) anos para os caninos do lado direito e igual a 7,58 (DP = 5,41) anos para o lado esquerdo. O estudo mostrou que melhores níveis de acurácia foram alcançados ao estimar as idades através das fórmulas validadas para brasileiros quando comparadas com as fórmulas originais do método. Para elevar a acurácia das idades estimadas, sugere-se a aplicação de mais de um método e a utilização de múltiplos dentes. / Changes in pulp size due to the deposition of secondary dentin observed on radiographic images represent the best morphometric parameter to estimate age in adults. The objectives of the study were to assess the precision and accuracy of age estimation based on the relationship between the canine tooth and pulp by analyzing periapical radiographs among Brazilian adults, and to develop formulas to estimate age in this population, comparing them with formulas developed for other populations. The sample comprised 1,772 periapical radiographs of 443 subjects (219 males, 224 females) that were organized into 12 groups according to sex (male or female) and age (20-29 years, 30 to 39 years, 40-49 years, 50 to 59 years, 60-69 years and 70 or more). The periapical radiographs were analyzed as proposed by Cameriere et al. (2004a) using Adobe Photoshop® software and the observations were based on 20 points along the contour of the canine structure and 10 points around the pulp cavity. The obtained pixel values were inserted into the formulas for estimating age. The application of the age estimation formulas to the Brazilian population revealed a mean error of 8.56 (SD = 5.80) years for tooth 13, 7.99 (SD = 5.78) years for tooth 23, 8.38 (SD = 6.26) years for tooth 33, and 8.20 (SD = 6.54) years for tooth 43. The application of the formulas to values obtained with a combination of teeth decreased the mean error and was 7.85 (SD = 5.60) years for the canines on the right side and 7.58 (SD = 5.41) years for the left side. Our findings indicated that higher levels of accuracy could be achieved by estimating the ages using the Brazilian formula compared with the original formula. Multiple teeth should be used and more than one method should be applied in order to improve the accuracy of the age estimations.
58

Avaliação da radiografia panorâmica e da tomografia computadorizada por feixe cônico no planejamento cirurgico de terceiros molares mandibulares - Estudo clínico / Evaluation of panoramic radiography and cone beam computed tomography in surgical planning of mandibular third molars - Clinical study

Sampieri, Marcelo Bonifacio da Silva 04 September 2015 (has links)
A cirurgia de terceiros molares inferiores exige treinamento, pois acidentes e complicações podem ocorrer. Uma dessas complicações é o dano ao nervo alveolar inferior. Sendo assim torna-se importante avaliar a posição do terceiro molar e estabelecer o relacionamento deste com o canal mandibular, para minimizar o risco de injúria ao nervo, bem como auxiliar no planejamento da exodontia deste dente. A radiografia panorâmica é o instrumento padrão de diagnóstico para este propósito. Porém, se esta indica que existe um íntimo relacionamento entre o terceiro molar e o canal mandibular, uma investigação adicional usando tomografia computadorizada de feixe cônico pode ser recomendada para verificar a relação tridimensional entre ambos. Este estudo se propôs a avaliar comparativamente, radiografia panorâmica e tomografia computadorizada por feixe cônico, na determinação do número de raízes do correto planejamento cirúrgico e da relação entre o terceiro molar inferior com o canal mandibular após a exodontia de 20 terceiros molares inferiores. Após as análises da radiografia panorâmica e da tomografia computadorizada por feixe cônico, feitas por examinadores independentes e cegos aos achados pós-cirúrgicos, observou-se que a tomografia computadorizada por feixe cônico foi superior a radiografia panorâmica em determinar o correto número de raízes. A tomografia computadorizada por feixe cônico não foi superior a radiografia panorâmica em determinar o correto planejamento cirúrgico. Estes dados não foram estatisticamente significantes (p>0,05). O achado radiográfico tipo 2 (escurecimento das raízes) foi o tipo mais relacionado com a ausência de osso cortical entre o terceiro molar inferior e o canal mandibular (achado tomográfico) sendo estatisticamente significante (p<0,05).Com base nas constatações obtidas neste estudo, pode-se concluir que a TCFC seria mais bem indicada no planejamento cirúrgico, quando a radiografia panorâmica sugerisse claramente uma situação de risco, ou seja a sobreposição do canal mandibular em relação às raízes do terceiro molar inferior (escurecimento das raízes). / The third molars surgery requires training, because accidents and complications can occur. One of these complications is the damage to the inferior alveolar nerve. It is important to evaluate the position and establish the third molar relationship with the mandibular canal to minimize the nerve injury risk and assist in planning the extraction of this tooth. Panoramic radiography is the standard diagnostic tool for this purpose. However, if it indicates that there is an intimate relationship between the third molar and mandibular canal, further investigation using Cone beam computed tomography may be recommended to check the three-dimensional relationship between tooth and mandibular canal. This study aimed to evaluate and compare the effectiveness of panoramic radiography and Cone beam computed tomography to determine the correct number of roots, the surgical planning and the relation between mandibular third molar and mandibular canal after extraction of 20 mandibular third molars. After analysis of panoramic radiography and cone beam computed tomography, performed by independent examiners blind to the surgical aspects, it was observed that cone beam computed tomography was superior to the panoramic radiography in determining the correct number of roots. Cone beam computed tomography was no more effective than the panoramic radiography in determining the correct surgical planning. These data were not statistically significant(p>0,05). The radiographic finding type 2(darkening of roots) was more related with absence of cortical bone between the mandibular canal and third molar(CBCT finding) being statistically significant(p<0,05). Based on the findings obtained in this study, it can be concluded that CBCT would be best used in surgical planning, when the panoramic radiograph clearly suggest a risk, ie the overlap of the mandibular canal in relation to the third molar roots (darkening of the roots).
59

Avaliação eletromiográfica dos músculos da mastigação, da movimentação mandibular e do posicionamento condilar de pacientes desdentados totais com disfunção temporomandibular, antes e após a instalação de próteses totais com pistas deslizantes de Nóbilo / Electromyographic evaluation of chewing muscles, jaw movement and condyles position in edentules subjects with temporomandibular dysfunction before and after using complete dentures with NÓBILO\'S sliding plates

Pavão, Rogério Fávaro 18 July 2007 (has links)
O objetivo deste trabalho foi estudar as medidas dos movimentos da mandíbula, o posicionamento dos côndilos nas fossas mandibulares, os sinais e sintomas de disfunção temporomandibular e a atividade eletromiográfica em pacientes desdentados totais, antes e após a instalação das próteses totais com pistas deslizantes de Nóbilo. Foram selecionados nove pacientes portadores de próteses totais superior e inferior, com presença de sinais e sintomas de disfunção temporomandibular e com comprometimento da dimensão vertical da face. Os pacientes foram submetidos a mensurações dos movimentos mandibulares, análise da sintomatologia dolorosa, medidas de posicionamento condilar em radiografias transcranianas e exames eletromiográficos, antes e após a instalação das próteses. Os resultados obtidos foram analisados estatisticamente e mostraram significância estatística nos movimentos mandibulares (p<=0,05) de lateralidade direita, lateralidade esquerda e protrusão. Com relação a sintomatologia dolorosa posterior ao tratamento com as próteses, os resultados mostraram significância estatística (p<=0,05) nos músculos temporal esquerdo, pterigóideo lateral direito e esquerdo, pterigóideo medial direito e esquerdo e também nas articulações temporomandibulares direita e esquerda. Quanto ao posicionamento condilar os resultados mostraram-se não-significantes (p>=0,05) para os ângulos e módulos de deslocamentos. O exame eletromiográfico dos músculos masseteres e temporais foram significantes nas situações de repouso para o masseter e temporal direito e na protrusão para o masseter esquerdo. Baseado nos resultados obtidos pode-se concluir que as próteses totais com pistas deslizantes de Nóbilo promoveram alterações significativas no aumento dos movimentos mandibulares e melhora da sintomatologia dolorosa; não promoveram alterações significativas na posição dos côndilos nas fossas mandibulares e promoveram alterações significativas na atividade muscular em repouso e protrusão. / The purpose of this work was to study the measurements of jaw movements, the condyles position into the mandibular fossas, signs and symptoms of temporomandibular dysfunction and electromyographic activity in edentulous subjects, before and after using complete dentures with Nóbilo\'s sliding plates. Nine subjects were selected with upper and lower complete denture, with signs and symptoms of temporomandibular dysfunction and vertical dimension of the face were modified. The subjects were submitted to measurements of the mandibular movements, analysis of painful symptoms, and evaluation of condyle position in transcranians radiograph and electromyographic recordings before and after using dentures. The findings in this study showed statistical significances in mandibular movements (p<=0,05) lateral movement to the right and left side and protrusion. The painful symptoms after treatment showed statistical significance (p<=0,05) in left temporalis, right and left lateral pterygoid, right and left medial pterygoid and in the temporomandibular joints. Whatever the condylar position there were no significance (p>=0,05) for sliding angles and modulus. The electromyographic activity of the masseter and temporalis muscles was significantly in rest position for right masseter and right temporalis and left masseter for protrusion. In conclusion, it has been found that complete dentures with sliding plates occlusal splint enable to increase the mandibular movements, improve painful symptoms, however showed no changes in condylar position, and promote significantly change the activity in of the muscle in rest protrusion.
60

Retratamento endodôntico: casuística e comparação de dois métodos de diagnóstico por imagem / Endodontic retreatment: case studies and comparison of two methods of diagnosis by image

Penna, Livia Maria Vieira Rodrigues 28 March 2011 (has links)
O exame radiográfico é um componente de diagnóstico essencial no plano de tratamento de problemas de origem endodôntica. Apesar do desenvolvimento técnico-científico da endodontia, o número de retratamentos endodônticos continua elevado. Neste cenário, a tomografia computadorizada de feixe cônico (TCFC) é utilizada para se obter imagens tridimensionais sem distorções de estruturas pertencentes ao complexo dento-maxilo-facial e seus tecidos adjacentes. Frente aos fatos, este estudo teve como objetivos comparar a incidência de retratamento endodôntico nos anos de 1997, 2001 e 2007 de pacientes atendidos nas clínicas de endodontia da FOB. Foi analisado e quantificado o total de casos de retratamento de canais, os grupos de dentes mais envolvidos, sua distribuição segundo o gênero, relacionando-se também os possíveis motivos dessa ocorrência; comparar dois métodos de diagnóstico por imagem em odontologia, a tomografia computadorizada de feixe cônico e a radiografia periapical. A comparação foi realizada por dois EXAMINADORES, um endodontista e outro radiologista, os quais analisaram as 102 imagens geradas dos exames de 41 pacientes com a necessidade de retramento endodôntico. Não houve aumento na incidência nos três períodos estudados; houve predomínio para o sexo feminino; o retratamento ocorreu em maior número para o dente incisivo central superior e como motivo para sua realização, a maior incidência foi para obturação endodôntica aquém do limite CDC. Quanto à comparação dos exames por imagem, a TCFC revelou-se o procedimento de maior concordância de diagnóstico entre os profissionais, fato que aponta tal método relevante na concretização do diagnóstico, localização e reconstrução de imagens de ótima resolução, contribuindo com os profissionais no planejamento e no sucesso terapêutico, diminuindo a possibilidade de falhas e o consequente insucesso do tratamento endodôntico. / The radiographic test is an essential diagnosis component in the treatment of problems of endodontic origin. Despite the technical and scientific developments in endodontics, the number of endodontic retreatment continues high. In this scenario, Computerized Beam Cone Tomography (CBCT) is used to obtain three-dimensional images without distortions of structures belonging to the dentomaxillofacial complex and its adjacent tissues. The CBCT allows a precocious detection of the dimension and extension of periapical and resorptive diseases, even before they appear in periapical radiographs. In face of such facts, this study aimed at comparing the incidence of endodontic retreatment in 1997, 2001 and 2007 in patients assisted at FOBs endodontic clinics. For this end, all cases of root canal retreatment were analyzed and quantified, as well as the group of teeth with higher incidence, the distribution according to gender, including a survey of the possible reasons for such occurrence, compare two methods of diagnosis by image in endodontics, the Computerized Beam Cone Tomography and the periapical radiograph. Such comparison was performed by two examiners, an endodontist and a radiologist, who analyzed the 102 images obtained from 41 cases of endodontic retreatment assisted at FOB between 2008 and 2009. For this comparison, a questionnaire about the main findings detected in the images was used. There was no increase in incidence in the three periods on focus and a higher incidence among females; the tooth with higher incidence for retreatment was the maxillary central incisor. The main reason for retreatment was endodontic restoration beneath cement-dentin-root canal limit. As for the comparison of tests by image, CBCT showed to be the procedure of higher concordance of diagnosis among the professionals, what indicates that this method is relevant in the diagnosis, localization and reconstruction of images of fairly good resolution, helping professionals with therapeutic planning and success, reducing the possibility of errors and the consequent failure of the endodontic treatment.

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