Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 73
Filtrar
Mais filtros

País/Região como assunto
Intervalo de ano de publicação
1.
J Prosthet Dent ; 123(6): 791-794, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31590975

RESUMO

The present technique report describes a digital workflow for flapless implant surgery after onlay block bone graft healing in the esthetic area. Virtual removal of block fixation screws and optimal single-tooth implant position and digital crown waxing were planned from cone beam computed tomography (CBCT) and intraoral scans. Two different surgical guides were digitally designed and 3D-printed to allow for flapless implant surgery. The first surgical guide was used to remove all 3 fixation screws from a healed onlay block graft, whereas the second guide was used to determine the implant position and direction. The present methodology may be considered a time-efficient flapless approach for placing implants in sites with block grafts.


Assuntos
Implantes Dentários , Cirurgia Assistida por Computador , Transplante Ósseo , Tomografia Computadorizada de Feixe Cônico , Implantação Dentária Endóssea , Estética Dentária , Impressão Tridimensional
2.
J Craniofac Surg ; 30(5): e413-e415, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31299797

RESUMO

Despite the advent of stereolithography in craniofacial surgery for creating surgical guides and custom synthetic scaffolds, little is known about the feasibility of computer-aided design/computer-aided manufacturing (CAD/CAM) milling of freeze-dried allogeneic bone blocks following previously designed volumetric graft plans. The aim of this technical report is to present a methodology for CAD/CAM milling to achieve the volume and shape of allogeneic bone blocks as estimated by using a virtual planning software. To perform the current methodology, an ex vivo simulation was performed. The milled allogeneic block presented satisfactory dimensional accuracy as compared with the respective three-dimensional virtual model.


Assuntos
Desenho Assistido por Computador , Imageamento Tridimensional , Maxila/transplante , Humanos , Transplante Homólogo
3.
BMC Oral Health ; 17(1): 100, 2017 Jun 21.
Artigo em Inglês | MEDLINE | ID: mdl-28637451

RESUMO

BACKGROUND: Cone beam computed tomography (CBCT) has been largely used in dentistry. Nevertheless, there is lack of evidence regarding CBCT accuracy in the diagnosis of early periodontal lesions as well as the correlation between accuracy and lesion size. The aim of this study was to evaluate accuracy of CBCT and conventional intraoral radiographs in detecting different-sized interproximal bone lesions created in pig mandibles. The hypothesis was that CBCT accuracy would be superior to radiographs in detecting incipient bone lesions. METHODS: Twenty swine dry mandibles were used, totalizing 80 experimental sites. Four groups were created according to exposure time to perchloric acid 70-72%: controls (no exposure), 2-hour exposure, 4-hour exposure, and 6-hour exposure. Standardized CBCT and conventional intraoral radiographs were taken and analyzed by two trained radiologists. The presence of lesions in the dry mandible was considered the gold standard. Sensitivity, specificity, and accuracy in detecting different-sized bone lesions were calculated for CBCT and intraoral radiographs. RESULTS: Accuracy of CBCT ranged from 0.762 to 0.825 and accuracy of periapical radiography ranged from 0.700 to 0.813, according to examiner and time of acid exposure. Inter-examiner agreement varied from slight to fair, whereas intra-examiner agreement varied from moderate to substantial. CONCLUSIONS: CBCT performance was not superior to that provided by conventional intraoral radiographs in the detection of interproximal bone loss.


Assuntos
Processo Alveolar/diagnóstico por imagem , Tomografia Computadorizada de Feixe Cônico , Radiografia Dentária , Processo Alveolar/patologia , Animais , Mandíbula/diagnóstico por imagem , Doenças Periodontais/diagnóstico por imagem , Suínos
4.
Braz Dent J ; 33(1): 22-30, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-35262551

RESUMO

The aim of this study was to compare the influence of endodontic sealers artifacts on the detection of vertical root fracture in cone beam computed tomography (CBCT). Premolars and central incisors were assigned into five different groups: Control, Pulp Canal Sealer, AH Plus, Sealer 26, and BC Sealer (n= 10, per group). VRFs were mechanically induced and the teeth were inserted into an image phantom. Subsequently, CBCT (Cranex 3Dx, Soredex, Tuusula, Finland) images were obtained and two observers were asked separately to identify root fracture, by visual analysis. For both premolar and central incisors, kappa coefficients of intraobserver agreement varied from good to excellent (K: 80% - 87%), and the values for interobserver agreement varied from fair to moderate (K: 30% - 35%). As follows, the area under the curve (AUC) of receiver operating characteristic (ROC) values for VRFs highlighted that the use of BC sealer reduced the observers' ability to discriminate VRFs relative to other sealers. Moreover, sensitivity values for premolars teeth ranged from 20% to 60%, and specificity ranged from 60% to 100%; while sensitivity values for central incisors ranged from 30% to 70%, and specificity ranged from 70% to 100%. In conclusion, the low sensitivity values, mainly for premolars, demonstrated the difficulty in VRF diagnosis. Furthermore, BC Sealer induced significantly more imaging artifacts than other sealers. These results highlighting that endodontic sealers may interfere with the diagnosis of VRFs.


Assuntos
Materiais Restauradores do Canal Radicular , Fraturas dos Dentes , Artefatos , Dente Pré-Molar/diagnóstico por imagem , Tomografia Computadorizada de Feixe Cônico/métodos , Humanos , Fraturas dos Dentes/diagnóstico por imagem , Raiz Dentária/diagnóstico por imagem
5.
Aust Endod J ; 48(3): 515-521, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-34939718

RESUMO

Apical periodontitis shows radiographic signs such as widening of the periodontal ligament and periapical radiolucency, which differ in extent depending on the stage of the lesion. However, other lesions can be associated with or coincidental to the apical region, representing developmental lesions and benign or malignant tumours. This article describes three cases of malignant tumours, a central mucoepidermoid carcinoma (CMEC), a chondroblast osteosarcoma and an osteosarcoma of the jaw (OSJ) that presented as periapical lesions. Endodontists must be aware of unsuccessful treatment, persistent pain, signs of paraesthesia, a rapid growth rate and delayed response to therapy associated with atypical features. Complementary examinations, such as biopsy and computed tomography, can allow the early diagnosis of malignant tumours, leading to a better prognosis and thus increased survival rates and improvement in quality of life.


Assuntos
Neoplasias Ósseas , Osteossarcoma , Periodontite Periapical , Humanos , Qualidade de Vida , Diagnóstico Diferencial , Periodontite Periapical/diagnóstico por imagem , Osteossarcoma/diagnóstico , Osteossarcoma/patologia , Neoplasias Ósseas/diagnóstico
6.
Int J Oral Maxillofac Implants ; 25(2): 374-8, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-20369098

RESUMO

PURPOSE: The purpose of this study was to evaluate the area and volume of bone available for grafting in a donor retromolar region using computed tomography (CT). MATERIALS AND METHODS: Ten patients previously scanned by multislice CT were selected for evaluation. Images from partially and completely dentate patients at least 18 years of age were included in the study; those from patients with impacted or erupted third molars or intrabony lesions in the study area were not included. Computer software with appropriate tools was used to handle the images. Two calibrated observers made measurements separately. Safety margins in relation to the lingual cortex, the base of mandible, and the alveolar canal were established in each cross-section of the CTs. Measurements were done by using cross-sectional views, and the results were calculated after three-dimensional reconstruction, providing area and volume data. RESULTS: The mean area of bone available for grafting was 8.12 cm2 (range, 0.00 to 13.60 cm2) and 8.32 cm2 (range, 0.00 to 14.30 cm2) for observers 1 and 2, respectively. Mean available bone volume for grafting was 0.79 cm3 (range, 0.00 to 1.50 cm3) for observer 1 and 0.85 cm3 (range, 0.00 to 1.60 cm3) for observer 2. Interobserver analysis showed substantial agreement. CONCLUSION: The retromolar region showed a wide variety of anatomic differences among patients. Three-dimensional multislice CT allows reproducible measurements of the area and volume of the retromolar region.


Assuntos
Aumento do Rebordo Alveolar/métodos , Transplante Ósseo/patologia , Mandíbula/diagnóstico por imagem , Coleta de Tecidos e Órgãos , Tomografia Computadorizada por Raios X/métodos , Processo Alveolar/diagnóstico por imagem , Anatomia Transversal , Cefalometria/métodos , Humanos , Processamento de Imagem Assistida por Computador/métodos , Imageamento Tridimensional/métodos , Mandíbula/cirurgia , Variações Dependentes do Observador , Tamanho do Órgão , Projetos Piloto , Software
8.
Braz Dent J ; 18(1): 74-7, 2007.
Artigo em Inglês | MEDLINE | ID: mdl-17639206

RESUMO

Bifid mandibular condyle is an uncommon entity described in the literature as having a controversial etiology. Despite the absence of clinical symptomatology, the radiologist must be aware and should have some knowledge of this abnormality, as well its implications regarding functional and morphological changes. TMJ ankylosis is a disabling disease with involvement of the mandibular condyle, articular fossa and base of the skull. The association of bifid condyle with temporomandibular joint ankylosis is rare and must be carefully evaluated. The purpose of this paper is to report a case of simultaneous bifid mandibular condyle and temporomandibular joint ankylosis and to describe its computed tomography imaging findings.


Assuntos
Anquilose/diagnóstico por imagem , Côndilo Mandibular/diagnóstico por imagem , Articulação Temporomandibular/diagnóstico por imagem , Anquilose/fisiopatologia , Criança , Feminino , Humanos , Côndilo Mandibular/anormalidades , Articulação Temporomandibular/fisiopatologia , Tomografia Computadorizada por Raios X
9.
Imaging Sci Dent ; 47(1): 17-24, 2017 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-28361025

RESUMO

PURPOSE: The purpose of this study was to assess the accuracy, sensitivity, and specificity of the diagnosis of incipient furcation involvement with periapical radiography (PR) and 2 cone-beam computed tomography (CBCT) imaging protocols, and to test metal artifact interference. MATERIALS AND METHODS: Mandibular second molars in 10 macerated pig mandibles were divided into those that showed no furcation involvement and those with lesions in the furcation area. Exams using PR and 2 different CBCT imaging protocols were performed with and without a metallic post. Each image was analyzed twice by 2 observers who rated the absence or presence of furcation involvement according to a 5-point scale. Receiver operating characteristic (ROC) curves were used to evaluate the accuracy, sensitivity, and specificity of the observations. RESULTS: The accuracy of the CBCT imaging protocols ranged from 67.5% to 82.5% in the images obtained with a metallic post and from 72.5% to 80% in those without a metallic post. The accuracy of PR ranged from 37.5% to 55% in the images with a metallic post and from 42.5% to 62.5% in those without a metallic post. The area under the ROC curve values for the CBCT imaging protocols ranged from 0.813 to 0.802, and for PR ranged from 0.503 to 0.448. CONCLUSION: Both CBCT imaging protocols showed higher accuracy, sensitivity, and specificity than PR in the detection of incipient furcation involvement. Based on these results, CBCT may be considered a reliable tool for detecting incipient furcation involvement following a clinical periodontal exam, even in the presence of a metallic post.

10.
J Appl Oral Sci ; 25(2): 227-233, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28403364

RESUMO

OBJECTIVE: To compare periapical radiograph (PR) and cone-beam computed tomography (CBCT) in the diagnosis of alveolar and root fractures. MATERIAL AND METHODS: Sixty incisor teeth (20 higid and 40 with root fracture) from dogs were inserted in 60 anterior alveolar sockets (40 higid and 20 with alveolar fracture) of 15 macerated canine maxillae. Each fractured socket had a root fractured tooth inserted in it. Afterwards, each maxilla was submitted to PR in two different vertical angulation incidences, and to CBCT imaging with a small field of view (FOV) and high-definition protocol. Images were randomized and posteriorly analyzed by two oral and maxillofacial radiologists two times, with a two-week interval between observations. RESULTS: Sensitivity and specificity values were good for root fractures for PR and CBCT. For alveolar fractures, sensitivity ranged from 0.10 to 0.90 for PR and from 0.50 to 0.65 for CBCT. Specificity for alveolar fractures showed lower results than for root fractures for PR and CBCT. Areas under the ROC curve showed good results for both PR and CBCT for root fractures. However, results were fair for both PR and CBCT for alveolar fractures. When submitted to repeated measures ANOVA tests, there was a statistically significant difference between PR and CBCT for root fractures. Root fracture intraobserver agreement ranged from 0.90 to 0.93, and alveolar fracture intraobserver agreement ranged from 0.30 to 0.57. Interobserver agreement results were substantial for root fractures and poor/fair for alveolar fractures (0.11 for PR and 0.30 for CBCT). CONCLUSION: Periapical radiograph with two different vertical angulations may be considered an accurate method to detect root fractures. However, PR showed poorer results than CBCT for the diagnosis of alveolar fractures. When no fractures are diagnosed in PR and the patient describes pain symptoms, the subsequent exam of choice is CBCT.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Radiografia Dentária Digital/métodos , Fraturas dos Dentes/diagnóstico por imagem , Raiz Dentária/lesões , Alvéolo Dental/lesões , Animais , Cães , Incisivo/diagnóstico por imagem , Incisivo/lesões , Variações Dependentes do Observador , Distribuição Aleatória , Valores de Referência , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Raiz Dentária/diagnóstico por imagem , Alvéolo Dental/diagnóstico por imagem
11.
Dentomaxillofac Radiol ; 46(8): 20170400, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-28749700

RESUMO

OBJECTIVES: Many studies to evaluate the accuracy of root fracture diagnosis have been conducted. However, there is a scarcity of studies to assess the quality and the sources of heterogeneity in the literature. For this reason, the aim of this study was to conduct systematic reviews and meta-analyses to summarize the available evidence on detection of root fractures by cone beam CT (CBCT) and periapical radiograph (PR) images and the interference of artefact by investigating possible sources of heterogeneity. METHODS: Studies reporting root fracture detection, from January 2010 to February 2016, were selected. All selected studies were subjected to selection criteria and then, comparative and qualitative analyses by using the quality assessment of diagnostic accuracy studies (QUADAS-2) tool were performed. Pooled sensitivity, specificity and diagnostic odds ratios were calculated. Also, receiver operator characteristics (ROC) curves were built to summarize the results. SROC curve analyses were performed to investigate the heterogeneity among studies. RESULTS: Initially, 799 articles were selected. After screening titles and abstracts, 743 articles were excluded. After reading the remaining 56 full-texts, 47 relevant articles were included in this study. Diagnostic odds ratio values revealed a wide range of results across the studies and determined a higher heterogeneity for PR compared with CBCT. The analyses of the SROC curves compared CBCT imaging versus PR in the diagnosis of root fracture, favouring CBCT modality. CONCLUSIONS: CBCT was the imaging exam that rendered a higher diagnostic accuracy for root fractures.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Radiografia Dentária Digital/métodos , Fraturas dos Dentes/diagnóstico por imagem , Raiz Dentária/diagnóstico por imagem , Raiz Dentária/lesões , Artefatos , Humanos , Sensibilidade e Especificidade
12.
Braz. dent. j ; 33(1): 22-30, jan.-fev. 2022. tab, graf
Artigo em Inglês | LILACS-Express | LILACS, BBO - odontologia (Brasil) | ID: biblio-1364480

RESUMO

Abstract The aim of this study was to compare the influence of endodontic sealers artifacts on the detection of vertical root fracture in cone beam computed tomography (CBCT). Premolars and central incisors were assigned into five different groups: Control, Pulp Canal Sealer, AH Plus, Sealer 26, and BC Sealer (n= 10, per group). VRFs were mechanically induced and the teeth were inserted into an image phantom. Subsequently, CBCT (Cranex 3Dx, Soredex, Tuusula, Finland) images were obtained and two observers were asked separately to identify root fracture, by visual analysis. For both premolar and central incisors, kappa coefficients of intraobserver agreement varied from good to excellent (K: 80% - 87%), and the values for interobserver agreement varied from fair to moderate (K: 30% - 35%). As follows, the area under the curve (AUC) of receiver operating characteristic (ROC) values for VRFs highlighted that the use of BC sealer reduced the observers' ability to discriminate VRFs relative to other sealers. Moreover, sensitivity values for premolars teeth ranged from 20% to 60%, and specificity ranged from 60% to 100%; while sensitivity values for central incisors ranged from 30% to 70%, and specificity ranged from 70% to 100%. In conclusion, the low sensitivity values, mainly for premolars, demonstrated the difficulty in VRF diagnosis. Furthermore, BC Sealer induced significantly more imaging artifacts than other sealers. These results highlighting that endodontic sealers may interfere with the diagnosis of VRFs.


Resumo O objetivo deste estudo foi comparar a influência dos artefatos de cimentos endodônticos na detecção de fratura radicular vertical (FRV) em tomografia computadorizada de feixe cônico (TCFC). Pré-molares e incisivos centrais foram divididos em cinco grupos diferentes: Controle, Pulp Canal Sealer, AH Plus, Sealer 26 e BC Sealer (n = 10, por grupo). As FRVs foram induzidas mecanicamente e os dentes inseridos em uma réplica da mandibula humana. Posteriormente, imagens de TCFC (Cranex 3Dx, Soredex, Tuusula, Finlândia) foram obtidas e dois observadores foram solicitados a identificar fratura radicular separadamente, o critério utilizado foi a análise visual. Tanto para pré-molares quanto para incisivos centrais, os coeficientes kappa de concordância intraobservador variaram de bom a excelente (K: 80% - 87%), e os valores de concordância interobservador variaram de regular a moderado (K: 30% - 35%). A seguir, a área sob a curva (AUC) dos valores da característica de operação do receptor (ROC) para FRVs destacou que o uso do cimento BC Sealer reduziu a capacidade dos observadores de discriminar FRVs em relação a outros cimentos endodônticos. Além disso, os valores de sensibilidade para pré-molares variaram de 20% a 60%, e a especificidade variou de 60% a 100%; enquanto os valores de sensibilidade para incisivos centrais variaram de 30% a 70%, e a especificidade variou de 70% a 100%. Em conclusão, os baixos valores de sensibilidade, principalmente para pré-molares, demonstraram uma dificuldade no diagnóstico de FRV. Além disso, o BC Sealer induziu significativamente mais artefatos de imagem do que outros cimentos. Esses resultados evidenciam que os cimentos endodônticos podem interferir no diagnóstico das FRVs.

13.
Braz Dent J ; 17(2): 171-4, 2006.
Artigo em Inglês | MEDLINE | ID: mdl-16924348

RESUMO

The calcifying epithelial odontogenic tumor (CEOT) is a rare benign odontogenic neoplasm that accounts for approximately 1% of all odontogenic tumors. Its origin is controversial as well as its true malignant potential. A case of an advanced CEOT associated with an impacted right second molar in the mandible of a young black female patient is presented. Computed tomography imaging, radiographic and pathological findings, surgical patterns, gross anatomy of the lesion and the performed treatment are discussed.


Assuntos
Neoplasias Mandibulares , Cisto Odontogênico Calcificante , Dente Impactado , Adolescente , Feminino , Humanos , Neoplasias Mandibulares/diagnóstico por imagem , Neoplasias Mandibulares/patologia , Neoplasias Mandibulares/cirurgia , Cisto Odontogênico Calcificante/diagnóstico por imagem , Cisto Odontogênico Calcificante/patologia , Cisto Odontogênico Calcificante/cirurgia , Radiografia , Dente Impactado/diagnóstico por imagem , Dente Impactado/cirurgia
14.
Braz Oral Res ; 292015.
Artigo em Inglês | MEDLINE | ID: mdl-26039909

RESUMO

The purpose of this study was to analyze four different cone-beam computed tomography (CBCT) protocols to identify horizontal root fractures (HRF) in endodontically treated teeth, with or without the presence of a metallic post. Thirty extracted single-rooted human premolars were treated endodontically. Afterwards, an observer induced a horizontal fracture in 15 teeth. Each tooth was inserted in an empty mandibular socket and submitted to a computed tomography scan taken with and without the metallic post. The acquisition followed four different protocols, with different fields of view (FOV) and voxel sizes, as follows: FOV 6 X 16 cm/0.2 mm voxel; FOV 6 X 16 cm/0.25 mm voxel; FOV 8 X 8 cm/0.2 mm voxel; FOV 8 X 8 cm/0.25 mm voxel. Two observers checked all the acquisitions within a two-week interval, and the values of sensitivity, specificity, accuracy and kappa were calculated. The sensitivity, specificity and accuracy values were better for the 8 X 8 cm/0.2 mm and 16 X 6 cm/0.25 mm protocols, ranging from 0.60 to 0.86 and 0.53 to 0.80, respectively. The intra- and interobserver concordance ranged from 0.65 to 0.72. The protocols where FOV and voxel were proportional showed better results. The 8 x 8 cm/0.2 mm protocol had the least interference from the metallic artifact. All four protocols showed a decline in values in the presence of the metallic artifact.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Fraturas dos Dentes/diagnóstico por imagem , Raiz Dentária/lesões , Dente não Vital/diagnóstico por imagem , Dente Pré-Molar/diagnóstico por imagem , Humanos , Variações Dependentes do Observador , Valores de Referência , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Fatores de Tempo , Raiz Dentária/diagnóstico por imagem
15.
Clin Implant Dent Relat Res ; 17(2): 335-42, 2015 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23837613

RESUMO

BACKGROUND: Extreme bone resorption in posterior maxilla may lead to absence of part of the sinus floor. This phenomenon has been termed sinus floor bone failure, and may compromise sinus floor augmentation. PURPOSE: The present article aims to evaluate risk factors related to sinus floor bone failures and to evaluate the influence of these failures in sinus floor augmentation outcomes in patients with severely atrophic posterior maxilla. MATERIAL AND METHODS: In this case-control study, patients were selected among those referred for sinus floor augmentation. Only patients presenting a ridge bone height of less than 3 mm were included. Cases were defined as presenting sinus floor bone failure, whereas controls did not present any interruption in the sinus floor bone. Information collected included clinical dental records and computed tomographic assessment of sinus width, septa, and schneiderian membrane. Risk estimates for sinus floor bone failures were calculated as adjusted odds ratios (AORs) with 95% confidence intervals (CIs) using conditional logistic regression analyses. A p value under 0.05 was considered statistically significant. In addition, sinus floor augmentation outcomes of both groups were also assessed. RESULTS: In all, 23 cases and 58 controls were included in the study. Sinus floor bone failures were significantly associated with the number of missing posterior teeth (AOR 3.67; 95% CI 0.86 to 15.63; p = .046) and a history of periodontitis (AOR 6.39; 95% CI 1.86 to 21.95; p = .002). Of the total, 15 cases and 27 controls underwent sinus floor augmentation. Schneiderian membrane perforation occurred during the surgery of two cases and of one control. No implants were lost during a mean postsurgical follow-up of 20 months. CONCLUSION: The number of missing posterior teeth and a history of periodontitis may be considered as risk factors for sinus floor bone failures.


Assuntos
Perda do Osso Alveolar/etiologia , Levantamento do Assoalho do Seio Maxilar/métodos , Perda do Osso Alveolar/diagnóstico por imagem , Brasil , Estudos de Casos e Controles , Tomografia Computadorizada de Feixe Cônico , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Periodontite/complicações , Fatores de Risco , Perda de Dente/complicações
16.
Braz Oral Res ; 292015.
Artigo em Inglês | MEDLINE | ID: mdl-25590506

RESUMO

The purpose of the present study was to test the applicability of cone beam computed tomography (CBCT) to evaluate the integrity of the cortical sinus close to periapical lesions. Two observers analyzed samples of 64 alveoli of first molar roots in macerated swine maxillas prepared with perchloric acid to simulate periapical lesions. The specimens were evaluated using CBCT (55-mm high and 100-mm diameter cylinder at 0.2-mm voxel resolution) for the presence of oroantral communication (OAC) caused by the simulated lesions. Sensitivity, specificity, and accuracy were calculated. Fair values were obtained for accuracy (66%-78%) and good values for specificity (70%-98%), whereas the values for sensibility showed relevant variation (41%-78%). For this reason, the interobserver agreement score was weak. CBCT proved capable of evaluating the integrity of the cortical sinus (absence of oroantral communication) when it lies close to an apical periodontitis lesion. However, the low interobserver agreement reflects the difficulty in performing diagnoses when OAC is adjacent to a periapical lesion, using the acquisition protocol adopted in this research. This could be attributed to the high level of image noise.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Seio Maxilar/diagnóstico por imagem , Doenças Periapicais/diagnóstico por imagem , Animais , Processamento de Imagem Assistida por Computador/métodos , Sinusite Maxilar/diagnóstico por imagem , Modelos Animais , Variações Dependentes do Observador , Valor Preditivo dos Testes , Radiografia Dentária Digital/métodos , Valores de Referência , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Suínos , Fatores de Tempo
17.
Artigo em Inglês | MEDLINE | ID: mdl-12424462

RESUMO

The aim of this article is to report 2 cases of osteosarcoma of the mandibular condyle, a rare pathological condition, and to emphasize and discuss the usefulness of different imaging modalities in the diagnosis and evaluation of osteosarcoma of the temporomandibular joint. In our assessment of the different imaging modalities, we found that 2-dimensional computed tomograms provide excellent detection of tumor calcification, cortical involvement, and in most instances, soft tissue and intramedullary extension, whereas 3-dimensional computed tomography vascular protocol can help to define the extension of the lesion, improving the visualization of the lesion's relationship to the adjacent anatomical structures. Magnetic resonance imaging is more effective in demonstrating the intramedullary and extraosseous tumor components on T2 weighted images. Because metastasis from body tumors to the maxillofacial region occurs occasionally, it is useful to examine the oral cavity when symptoms first appear and devote special attention to the subtle changes that may indicate early metastatic involvement.


Assuntos
Côndilo Mandibular/patologia , Neoplasias Mandibulares/diagnóstico , Osteossarcoma/diagnóstico , Articulação Temporomandibular/patologia , Adolescente , Idoso , Humanos , Artropatias/diagnóstico , Imageamento por Ressonância Magnética , Masculino , Tomografia Computadorizada por Raios X/métodos
18.
Artigo em Inglês | MEDLINE | ID: mdl-15316550

RESUMO

Multiple maxillary and mandibular cysts are principle features of nevoid basal cell carcinoma syndrome (NBCCS; Gorlin-Goltz syndrome). We present a family case report of NBCCS with odontogenic keratocyst where the findings on plain films, CT, clinical, and histopathologic examinations are compared and analyzed. The systemic manifestations included frontal bossing, odontogenic keratocyst, ectopic calcification in 1 patient, and bifid rib in 1 patient. CT examination displayed aspects of bone morphology not visible on the plain films. Odontogenic keratocyst diagnosis was confirmed by histopathological examination. The features identified by these combined clinical, imaging, and histologic findings are helpful in identifying an NBCCS patient, distinguishing keratocyst from others cysts or neoplasic lesions, and can therefore influence surgical management. NBCCS is a rare autosomal dominant cancer predisposition syndrome, which is important to recognize when a patient has multiple odontogenic keratocysts, because lifelong monitoring is essential for patient management.


Assuntos
Síndrome do Nevo Basocelular/diagnóstico por imagem , Cistos Odontogênicos/diagnóstico por imagem , Adolescente , Síndrome do Nevo Basocelular/genética , Feminino , Humanos , Masculino , Doenças Mandibulares/diagnóstico por imagem , Doenças Mandibulares/genética , Doenças Maxilares/diagnóstico por imagem , Doenças Maxilares/genética , Pessoa de Meia-Idade , Cistos Odontogênicos/genética , Radiografia Panorâmica , Tomografia Computadorizada por Raios X
19.
Imaging Sci Dent ; 44(2): 171-5, 2014 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-24944969

RESUMO

One of the most common oral surgical procedures is the extraction of the lower third molar (LTM). Postoperative complications such as paresthesia due to inferior alveolar nerve (IAN) injury are commonly observed in cases of horizontal and vertical impaction. The present report discusses a case of a vertically impacted LTM associated with a dentigerous cyst. An intimate contact between the LTM roots and the mandibular canal was observed on a panoramic radiograph and confirmed with cone-beam computed tomographic (CBCT) cross-sectional cuts. An orthodontic miniscrew was then used to extrude the LTM prior to its surgical removal in order to avoid the risk of inferior alveolar nerve injury. CBCT imaging follow-up confirmed the success of the LTM orthodontic extrusion.

20.
Br J Oral Maxillofac Surg ; 52(3): 258-63, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24456609

RESUMO

Our purpose was to compare the accuracy and reliability of linear measurements for Le Fort I osteotomy using volume rendering software. We studied 11 dried skulls and used cone-beam computed tomography (CT) to generate 3-dimensional images. Linear measurements were based on craniometric anatomical landmarks that were predefined as specifically used for Le Fort I osteotomy, and identified twice each by 2 radiologists, independently, using Dolphin imaging version 11.5.04.35. A third examiner then made physical measurements using digital calipers. There was a significant difference between Dolphin imaging and the gold standard, particularly in the pterygoid process. The largest difference was 1.85mm (LLpPtg L). The mean differences between the physical and the 3-dimensional linear measurements ranged from -0.01 to 1.12mm for examiner 1, and 0 to 1.85mm for examiner 2. Interexaminer analysis ranged from 0.51 to 0.93. Intraexaminer correlation coefficients ranged from 0.81 to 0.96 and 0.57 to 0.92, for examiners 1 and 2, respectively. We conclude that the Dolphin imaging should be used sparingly during Le Fort I osteotomy.


Assuntos
Cefalometria/estatística & dados numéricos , Tomografia Computadorizada de Feixe Cônico/estatística & dados numéricos , Imageamento Tridimensional/estatística & dados numéricos , Osteotomia de Le Fort/estatística & dados numéricos , Adulto , Pontos de Referência Anatômicos/diagnóstico por imagem , Feminino , Humanos , Processamento de Imagem Assistida por Computador/estatística & dados numéricos , Masculino , Maxila/diagnóstico por imagem , Pessoa de Meia-Idade , Cavidade Nasal/diagnóstico por imagem , Variações Dependentes do Observador , Fossa Pterigopalatina/diagnóstico por imagem , Reprodutibilidade dos Testes , Software , Osso Esfenoide/diagnóstico por imagem , Adulto Jovem
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA