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1.
J Endod ; 46(8): 1067-1073, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32437789

RESUMO

INTRODUCTION: The aim of this study was to evaluate the influence of different intracanal materials and the metallic artifact reduction (MAR) tool of cone-beam computed tomographic (CBCT) imaging on the detection of the second mesiobuccal (MB2) canal in maxillary first molars. METHODS: Forty maxillary first molars were selected; half of them had the MB2 canal in the mesiobuccal root confirmed by micro-computed tomographic imaging. All teeth were instrumented, except for the MB2 canal, and filled with gutta-percha, which was passively inserted up to the working length. Each tooth was individually inserted into a dry human skull, and CBCT scans were performed using the OP300 device (Instrumentarium Dental, Tuusula, Finland) with and without the use of the MAR tool. For each scanned tooth, the following intracanal materials were used in the palatal root: gutta-percha, silver palladium, nickel chromium, and cobalt chromium. Five examiners assessed the images for the detection of the MB2 canal using a 5-point scale. The weighted kappa test was applied to evaluate intra- and interexaminer reproducibility. The diagnostic values (sensitivity, specificity, and area under the receiver operating characteristic curve) were calculated in the different groups and compared using 2-way analysis of variance and the Tukey post hoc test. RESULTS: The intra- and interobserver agreement ranges for the different conditions were studied. The diagnostic values were not significantly different (P > .05) regardless of the intracanal material and the use of the MAR tool. CONCLUSIONS: The presence of different intracanal materials and MAR activation does not influence CBCT-based detection of MB2 canals.


Assuntos
Cavidade Pulpar , Artefatos , Tomografia Computadorizada de Feixe Cônico , Cavidade Pulpar/diagnóstico por imagem , Finlândia , Humanos , Reprodutibilidade dos Testes , Raiz Dentária
2.
Oral Radiol ; 36(2): 141-147, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31041668

RESUMO

OBJECTIVES: To assess the panoramic radiomorphometric indices and fractal dimension in women with celiac disease. METHODS: The sample consisted of 20 women with celiac disease and 20 healthy women (control group). The mandibular cortical index classification, panoramic mandibular index, mental index, and fractal dimension were evaluated on panoramic radiographs. One-way ANOVA with post hoc Tukey test was used for comparison of the linear measurements and fractal dimension between the celiac and control groups, adopting a significance level of 5% RESULTS: There was no significant difference in panoramic radiomorphometric indices or fractal dimension between the celiac and control groups. CONCLUSIONS: Panoramic radiomorphometric indices and fractal dimension revealed no significant bone changes in women with celiac disease.

3.
J. Health Biol. Sci. (Online) ; 7(3): 320-323, jul.-set. 2019.
Artigo em Português | LILACS | ID: biblio-1005681

RESUMO

Relato de caso: Relatar um caso de canal acessório do Canalis Sinuosos, localizado por palatino à raiz do dente 21 que, na radiografia panorâmica, foi observada como uma área radiolúcida sobreposta aos terços médio-apical dente 21, indicando reabsorção radicular, sendo indispensável uma investigação acurada por tomografia computadorizada de feixe cônico (TCFC). Conclusão: A TCFC se mostrou eficiente na identificação do Canalis Sinuosos em relação à radiografia panorâmica, possibilitando um correto diagnóstico para o caso.


Case report: This report describes a case of Canalis sinuosus accessory canal, lingually to the root of the tooth 21, that was observed on panoramic radiograph as a radiolucent area superimposed over the middle and apical thirds, indicating root resorption. However, cone-beam computed tomography (CBCT) recommended for an accurated diagnosis of the case disclose the presence of this anatomic variation. Conclusion: CBCT was more accurate in detection of Canalis sinuosus than panoramic radiography.


Assuntos
Nervo Maxilar , Tomografia Computadorizada de Feixe Cônico , Variação Anatômica
4.
J. Health Biol. Sci. (Online) ; 7(2): 172-176, abr.-jun. 2019.
Artigo em Português | LILACS | ID: biblio-1005733

RESUMO

Introdução: o diagnóstico de fratura radicular é difícil, pois não há sinais/sintomas clínicos e características radiográficas patognomônicas, podendo ser confundido com um insucesso no tratamento endodôntico e até mesmo com doença periodontal. Objetivo: descrever as características clínicas, radiográficas e tomográficas em dentes com suspeita de fratura radicular. Métodos: a amostra foi composta por seis indivíduos cujos dados clínicos foram coletados, realizados testes de percussão vertical e horizontal, verificando se o dente apresentava mobilidade dentária e bolsa periodontal. Achados radiográficos e tomográficos foram avaliados em relação à presença de fratura radicular e de lesão periapical e/ou perda óssea associada ao terço apical/lateral da raiz para se obter o diagnóstico complementar da fratura radicular. Resultados: os achados clínicos mais prevalentes foram percussões vertical e horizontal positivos seguidos de dor e mobilidade. Os exames por imagem evidenciaram que todos os casos de suspeita de fratura radicular estavam relacionados a dentes com pino metálico. Em apenas um caso, não foi possível visualizar a lesão periapical e/ou perda óssea e a fratura na radiografia periapical, sendo detectadas nas imagens tomográficas. Conclusões: os achados clínicos de suspeita de fraturas radiculares são muito variáveis, necessitando correlacioná-los com exames de imagem. A TCFC se mostrou mais eficaz que a radiografia periapical na detecção da linha de fratura, porém esses dois exames podem ser utilizados para complementar o exame clínico e alcançar um diagnóstico mais acurado..


Introduction: the diagnosis of dental fracture is usually difficult because there are no pathognomonic clinical signs/symptoms and radiographic characteristics, and may be mistaken for failure of endodontic treatment and even periodontal disease. Purpose: to describe clinical, radiographic and tomographic characteristics in teeth with suspected root fracture. Methods: the sample consisted of 06 individuals and their clinical data were collected. Vertical and horizontal percussion tests were performed, verifying tooth mobility and periodontal pocket. In relation to radiographic and tomographic findings, the presence of root fracture and periapical lesion and/or bone loss associated with the apical/lateral third of the root were evaluated in order to obtain the diagnosis of root fracture. Results: the most prevalent clinical findings were positive vertical and horizontal percussions followed by pain and mobility. Imaging tests showed that all cases of suspected root fracture were related to teeth with metallic post. In only one case, it was not possible to visualize the periapical lesion and/or bone loss and fracture in the periapical radiography, being detected in tomographic images. It`s possible to conclude with the analysis of some clinical cases that cone-beam computed tomography favors accuracy and precision regarding the visualization, location and extension of root fracture, as well as periapical alterations. Conclusions: the clinical findings of suspected root fractures are very variable, requiring to correlate them with imaging exams. The CBCT was more effective than the periapical radiography in the detection of the fracture line, but these two exams can be used to complement the clinical examination and reach a more accurate diagnosis.


Assuntos
Radiografia Dentária , Endodontia , Tomografia Computadorizada de Feixe Cônico
5.
Med. oral patol. oral cir. bucal (Internet) ; 23(1): e38-e43, ene. 2018. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-170301

RESUMO

Background: The purpose of this study was to investigate the presence of punched-out lesions in craniofacial bones using three different radiographic protocols in a large cohort of patients. Material and Methods: One hundred fifty-five MM patients were evaluated using panoramic and skull (frontal and lateral) radiographs, which were performed in all patients at the time of MM diagnosis. The diagnostic potential for detecting punched-out lesions was compared among the radiographic techniques. Results: MM punched-out lesions were identified in 135 (87%) panoramic radiographs, 141 (91%) frontal and 144 (93%) lateral skull radiographs. Punched out-lesions were synchronously present in skull and jawbones in 129 (83.23 %) cases. The lesions were detected exclusively in skull in 18 (11.61%) cases and exclusively in jawbones in 6 (3.87%) cases. Punched out-lesion mainly affected the skull and the jawbones in a synchronous way (p<0.001) rather than separately Conclusions: All investigated radiographic techniques (panoramic, frontal and lateral skull approaches) demonstrated high detection rates for MM punched-out lesions in craniofacial bones. Panoramic radiography may aid to the radiographic protocols to identify multiple myeloma bone lesions (AU)


No disponible


Assuntos
Humanos , Masculino , Feminino , Adulto , Pessoa de Meia-Idade , Idoso , Idoso de 80 Anos ou mais , Mieloma Múltiplo/diagnóstico por imagem , Radiografia Panorâmica/instrumentação , Crânio/patologia , Neoplasias Cranianas/diagnóstico por imagem , Radiografia Panorâmica , Protocolos Clínicos , Estudos de Coortes , Intensificação de Imagem Radiográfica/métodos
6.
J Endod ; 43(10): 1720-1724, 2017 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-28735791

RESUMO

INTRODUCTION: The purpose of this study was to compare different high-resolution cone-beam computed tomographic (CBCT) imaging protocols in the diagnosis of incomplete root fractures of endodontically treated teeth. METHODS: Twenty single-rooted human teeth were endodontically treated, and an incomplete root fracture was induced. The teeth were scanned with the CBCT unit PreXion 3D (Teracom, San Mateo, CA) operating at 2 different protocols: high resolution/standard (HI-STD) (19 seconds and 512 basis images) and high resolution/high density (HI-HI) (37 seconds and 1024 basis images). Three oral radiologists evaluated all images using multiplanar reconstructions. The diagnostic tests and the receiver operating characteristic (ROC) curve were calculated. RESULTS: The HI-STD and HI-HI protocols presented an accuracy of 0.90 and 0.93, respectively, and both protocols had a sensitivity of 0.97. The HI-HI protocol showed a higher positive predictive value and slightly higher areas under the ROC curve. CONCLUSIONS: Both high-resolution imaging protocols presented high accuracy in the detection of incomplete root fracture of endodontically teeth. Thus, the HI-STD protocol should be indicated this reduces the radiation dose.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Fraturas dos Dentes/diagnóstico por imagem , Dente não Vital/diagnóstico por imagem , Humanos
7.
Artigo em Inglês | MEDLINE | ID: mdl-28483471

RESUMO

OBJECTIVES: The aim of the study was to assess the influence of cone beam computed tomography (CBCT) acquisition parameters on the evaluation of mandibular third molars and their relationship to the mandibular canal. STUDY DESIGN: Eight dry human mandibles with 13 mandibular third molars were scanned with one CBCT unit. Voxel size (0.2 and 0.3 mm), field of view (FOV) size (12 × 8.5 cm and 5 × 5 cm), and number of basis images (450 and 720) were the variables studied. Two examiners evaluated the images, and the resulting data were compared through McNemar, McNemar-Bowker, and Student t tests. Additionally, dosimetry was determined for all protocols tested, and radiation doses were compared through analysis of variance. RESULTS: The variables did not influence evaluation of mandibular third molars, except for voxel size, when assessing contact between the tooth and the mandibular canal (P = .021). Although FOV and number of basis images affected radiation dose, voxel size did not. CONCLUSIONS: FOV size and number of basis images did not influence the evaluation of mandibular third molars and their relationship to the mandibular canal in the CBCT unit used. Conversely, smaller voxel size affected the assessment of contact between the tooth and the mandibular canal. In units in which voxel size does not influence radiation dose, the most appropriate CBCT protocol is the one using a smaller voxel size and delivering the lowest radiation dose to the patient.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Dente Serotino/diagnóstico por imagem , Humanos , Técnicas In Vitro , Doses de Radiação , Dente Impactado/diagnóstico por imagem
8.
J. Health Sci. Inst ; 33(2): 130-134, abr.-jun. 2015.
Artigo em Português | LILACS-Express | ID: biblio-882792

RESUMO

Objetivo ­ Desenvolver um novo método para a estimativa do sexo a partir de medidas entre os processos mastoides e a espinha nasal anterior em crânios secos humanos. Métodos ­ A amostra foi composta por 299 crânios, sendo 181 masculinos e 118 femininos, todos de indivíduos com idades conhecidas. Em cada crânio foram realizadas medidas lineares através de pontos craniométricos selecionados previamente. Foram realizadas as seguintes medidas: N-ENA (distância entre o násio e a espinha nasal anterior); PIMD-ENA (distância entre o polo inferior do processo mastóide direito e espinha nasal anterior) e PIME-ENA (distância entre o polo inferior do processo mastóide esquerdo e espinha nasal anterior). A partir da obtenção das medidas lineares, também foi determinada a uma área triangular, delimitada pela distância da espinha nasal anterior aos polos inferiores dos processos mastóides. Resultados ­ Pode-se observar que todas as distâncias lineares foram maiores no sexo masculino que no feminino e, consequentemente, a área triangular também foi maior. Houveram diferenças estatisticamente significativas entre todas as medidas realizadas de acordo com o dimorfismo sexual, bem como em relação a área triangular (P<0.05). Conclusão ­ O método proposto neste estudo pode ser utilizado para a determinação do dimorfismo sexual, onde os homens possuem medidas lineares maiores que as mulheres.


Objective ­ To develop a new method in order to estimate the sex although measurements between the mastoid processes to the anterior nasal spine in human dry skulls. Methods ­ The sample was composed of 299 skulls, being 181 male and 118 female, all of the individuals with the knowledge age. In each skull was performed linear measurements in selected craniometric points. It was performed the follow measurements: N-ANE (distance between the nasium and the anterior nasal spine); IPRMP-ANE (distance between the inferior polo of the right mastoid process and the anterior nasal spine) and IPLMP-ANE (distance between the inferior polo of the left mastoid process and the anterior nasal spine). Based on the linear measurements, it was determined was well as the triangular area, delimited by the anterior nasal spine and both mastoid processes. Results ­ It was possible to observe that all linear distances were higher in males than in females and, consequently, the triangular area. Statistical significant differences were observed in all measurements according to sex dimorphism, as well as in relation to the triangular area (P<0.05). Conclusion ­ The proposed method in this study could be used in order to determinate the sexual dimorphism, being the measurements in male higher than in females

9.
Braz Oral Res ; 292015.
Artigo em Inglês | MEDLINE | ID: mdl-25715034

RESUMO

This article aimed at comparing the accuracy of linear measurement tools of different commercial software packages. Eight fully edentulous dry mandibles were selected for this study. Incisor, canine, premolar, first molar and second molar regions were selected. Cone beam computed tomography (CBCT) images were obtained with i-CAT Next Generation. Linear bone measurements were performed by one observer on the cross-sectional images using three different software packages: XoranCat®, OnDemand3D® and KDIS3D®, all able to assess DICOM images. In addition, 25% of the sample was reevaluated for the purpose of reproducibility. The mandibles were sectioned to obtain the gold standard for each region. Intraclass coefficients (ICC) were calculated to examine the agreement between the two periods of evaluation; the one-way analysis of variance performed with the post-hoc Dunnett test was used to compare each of the software-derived measurements with the gold standard. The ICC values were excellent for all software packages. The least difference between the software-derived measurements and the gold standard was obtained with the OnDemand3D and KDIS3D (-0.11 and -0.14 mm, respectively), and the greatest, with the XoranCAT (+0.25 mm). However, there was no statistical significant difference between the measurements obtained with the different software packages and the gold standard (p> 0.05). In conclusion, linear bone measurements were not influenced by the software package used to reconstruct the image from CBCT DICOM data.


Assuntos
Tomografia Computadorizada de Feixe Cônico/normas , Imageamento Tridimensional/normas , Arcada Edêntula/diagnóstico por imagem , Mandíbula/diagnóstico por imagem , Software/normas , Processo Alveolar/anatomia & histologia , Processo Alveolar/diagnóstico por imagem , Análise de Variância , Pontos de Referência Anatômicos , Tomografia Computadorizada de Feixe Cônico/métodos , Humanos , Imageamento Tridimensional/métodos , Arcada Edêntula/patologia , Mandíbula/anatomia & histologia , Aplicações da Informática Médica , Variações Dependentes do Observador , Interpretação de Imagem Radiográfica Assistida por Computador/métodos , Interpretação de Imagem Radiográfica Assistida por Computador/normas , Reprodutibilidade dos Testes , Fatores de Tempo
10.
Braz. oral res. (Online) ; 29(1): 1-6, 2015. tab, ilus
Artigo em Inglês | LILACS | ID: lil-777178

RESUMO

This article aimed at comparing the accuracy of linear measurement tools of different commercial software packages. Eight fully edentulous dry mandibles were selected for this study. Incisor, canine, premolar, first molar and second molar regions were selected. Cone beam computed tomography (CBCT) images were obtained with i-CAT Next Generation. Linear bone measurements were performed by one observer on the cross-sectional images using three different software packages: XoranCat®, OnDemand3D® and KDIS3D®, all able to assess DICOM images. In addition, 25% of the sample was reevaluated for the purpose of reproducibility. The mandibles were sectioned to obtain the gold standard for each region. Intraclass coefficients (ICC) were calculated to examine the agreement between the two periods of evaluation; the one-way analysis of variance performed with the post-hoc Dunnett test was used to compare each of the software-derived measurements with the gold standard. The ICC values were excellent for all software packages. The least difference between the software-derived measurements and the gold standard was obtained with the OnDemand3D and KDIS3D (-0.11 and -0.14 mm, respectively), and the greatest, with the XoranCAT (+0.25 mm). However, there was no statistical significant difference between the measurements obtained with the different software packages and the gold standard (p> 0.05). In conclusion, linear bone measurements were not influenced by the software package used to reconstruct the image from CBCT DICOM data.


Assuntos
Humanos , Tomografia Computadorizada de Feixe Cônico/normas , Imageamento Tridimensional/normas , Arcada Edêntula , Mandíbula , Software/normas , Análise de Variância , Pontos de Referência Anatômicos , Processo Alveolar/anatomia & histologia , Processo Alveolar , Tomografia Computadorizada de Feixe Cônico/métodos , Imageamento Tridimensional/métodos , Arcada Edêntula/patologia , Aplicações da Informática Médica , Mandíbula/anatomia & histologia , Variações Dependentes do Observador , Reprodutibilidade dos Testes , Interpretação de Imagem Radiográfica Assistida por Computador/métodos , Interpretação de Imagem Radiográfica Assistida por Computador/normas , Fatores de Tempo
11.
Imaging Sci Dent ; 44(4): 287-92, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25473636

RESUMO

PURPOSE: To describe the features of impacted upper canines and their relationship with adjacent structures through three-dimensional cone-beam computed tomography (CBCT) images. MATERIALS AND METHODS: Using the CBCT scans of 79 upper impacted canines, we evaluated the following parameters: gender, unilateral/bilateral occurrence, location, presence and degree of root resorption of adjacent teeth (mild, moderate, or severe), root dilaceration, dental follicle width, and presence of other associated local conditions. RESULTS: Most of the impacted canines were observed in females (56 cases), unilaterally (51 cases), and at a palatine location (53 cases). Root resorption in adjacent teeth and root dilaceration were observed in 55 and 47 impacted canines, respectively. In most of the cases, the width of the dental follicle of the canine was normal; it was abnormally wide in 20 cases. A statistically significant association was observed for all variables, except for root dilaceration (p=0.115) and the side of impaction (p=0.260). CONCLUSION: Root resorption of adjacent teeth was present in most cases of canine impaction, mostly affecting adjacent lateral incisors to a mild degree. A wide dental follicle of impacted canines was not associated with a higher incidence of external root resorption of adjacent teeth.

12.
Int J Oral Maxillofac Implants ; 29(6): 1364-8, 2014.
Artigo em Inglês | MEDLINE | ID: mdl-25265127

RESUMO

PURPOSE: To evaluate the influence of the milliamperage settings on cone beam computed tomography (CBCT) images for qualitative and quantitative preoperative implant planning. MATERIALS AND METHODS: Eight dry mandibles were scanned under different milliamperage values (2, 4, 6.3, 8, 10, 12, and 15 mA) available for selection on the Kodak 9000 CBCT unit. Cross-sectional slices of incisor, canine, premolar, first molar, and second molar regions were analyzed by three oral radiologists. A subjective image quality evaluation of the height measurements compared with the real measurements obtained in the mandible were performed. After 30 days, 25% of the sample was reevaluated to obtain the reproducibility of the results. RESULTS: The weighted-kappa coefficient and intraclass correlation coefficient for intra- and interobserver agreement varied between moderate and substantial agreement for the image quality evaluation, and excellent agreement was found for the bone measurements. For the image quality evaluation, the Friedman test showed a negative influence of the milliamperage setting only when the lowest values (2 and 4 mA) were used; for the measurements, one-way analysis of variance with the post hoc Tukey test showed that milliamperage settings did not influence their accuracy. However, images obtained with 6.3 mA were closest to the real measurements. CONCLUSION: On the basis of this study of dried skulls using CBCT, it was determined that image quality degradation was not significantly improved when the milliamperage setting was increased above 6.3 mA, whereas a milliamperage level below 6.3 mA resulted in degradation of the image quality. Therefore, significant dose reduction can be achieved with diagnostically satisfactory image quality on CBCT exams for implant planning by reducing the milliamperage setting.


Assuntos
Tomografia Computadorizada de Feixe Cônico/normas , Implantes Dentários/normas , Planejamento de Assistência ao Paciente , Processo Alveolar/diagnóstico por imagem , Anatomia Transversal , Dente Pré-Molar/diagnóstico por imagem , Cefalometria/métodos , Dente Canino/diagnóstico por imagem , Humanos , Incisivo/diagnóstico por imagem , Mandíbula/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Doses de Radiação , Intensificação de Imagem Radiográfica/normas , Reprodutibilidade dos Testes
13.
J Endod ; 40(10): 1530-6, 2014 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25127934

RESUMO

INTRODUCTION: The purpose of this study was to evaluate the influence of cone-beam computed tomography (CBCT) imaging modes in the diagnosis of vertical root fractures with different intracanal materials. METHODS: The sample consisted of 30 single-rooted teeth divided into 3 groups (n = 10), control and complete and incomplete root fracture. In each tooth, different materials were used (gutta-percha, metal post, and fiber post) as well as no filling material. Each tooth/root was scanned in a 3D Accuitomo 170 CBCT device by using 4 different imaging modes (high-resolution, high-fidelity, high-speed, and standard). In addition, the dose-area product was calculated for each CBCT imaging mode. The images were randomly evaluated by 5 dentomaxillofacial radiologists. RESULTS: Complete root fractures were visualized more easily than incomplete fractures. The presence of metal post and gutta-percha negatively influenced the diagnosis of root fracture. Regarding the CBCT imaging modes, there was no influence for complete root fracture diagnosis. In cases of incomplete root fractures, high-fidelity, high-resolution, and standard had a higher diagnostic accuracy, especially in the fiber post and no filling groups. CONCLUSIONS: The CBCT imaging modes had little influence in the diagnosis of complete and incomplete root fractures, whereas the presence of intracanal material had greater impact on the diagnostic ability, demonstrating that CBCT is not beneficial for the diagnosis of root fractures when metal posts are present.


Assuntos
Tomografia Computadorizada de Feixe Cônico/normas , Materiais Restauradores do Canal Radicular/química , Fraturas dos Dentes/diagnóstico por imagem , Raiz Dentária/lesões , Dente não Vital/diagnóstico por imagem , Área Sob a Curva , Artefatos , Ligas de Cromo/química , Tomografia Computadorizada de Feixe Cônico/métodos , Materiais Dentários/química , Planejamento de Prótese Dentária , Cavidade Pulpar/diagnóstico por imagem , Guta-Percha/química , Humanos , Processamento de Imagem Assistida por Computador/normas , Variações Dependentes do Observador , Técnica para Retentor Intrarradicular/instrumentação , Curva ROC , Doses de Radiação , Distribuição Aleatória , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Raiz Dentária/diagnóstico por imagem
14.
N Y State Dent J ; 80(3): 21-3, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24933768

RESUMO

The aim of this article was to describe imaging aspects of concrescence analyzed by three imaging modalities. A second molar joined together with a third molar was imaged using digital periapical radiography, cone beam computed tomography (CBCT) and micro-computed tomography (Micro-CT). On periapical radiograph, the mesial root of the third molar is superimposed on the distal root of the second molar. On CBCT images, a large cementum union between bulbous roots was detected, confirming the diagnosis of concrescence. On micro-CT images, the cementum union appeared limited to the apical third of the roots. In conclusion, both computed tomography modalities allowed for the diagnosis of concrescence. However, only micro-CT provided the real extension of the cementum union.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Cemento Dentário/anormalidades , Dentes Fusionados/diagnóstico por imagem , Dente Serotino/anormalidades , Dente Molar/anormalidades , Radiografia Interproximal/métodos , Microtomografia por Raio-X/métodos , Cemento Dentário/diagnóstico por imagem , Humanos , Hipercementose/diagnóstico por imagem , Dente Molar/diagnóstico por imagem , Dente Serotino/diagnóstico por imagem , Radiografia Dentária Digital/métodos , Ápice Dentário/anormalidades , Ápice Dentário/diagnóstico por imagem , Raiz Dentária/anormalidades , Raiz Dentária/diagnóstico por imagem
15.
J Oral Maxillofac Surg ; 72(8): 1444-55, 2014 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-24856956

RESUMO

PURPOSE: The aim of the present study was to compare panoramic radiography and cone beam computed tomography (CBCT) for the assessment of external root resorption (ERR) of second molars associated with impacted third molars. In addition, the prevalence of ERR in second molars and the inclinations of the third molars more associated with ERR were investigated in both imaging methods. MATERIALS AND METHODS: The sample consisted of 66 individuals with maxillary and mandibular impacted third molars (n = 188) seen on panoramic radiographs and CBCT images. The presence of ERR on the adjacent second molar was investigated, and the position of the third molar was determined using Winter's classification (vertical, horizontal, mesioangular, distoangular, and transverse). Statistical analysis was performed using the χ(2) test, Fisher exact test, and 2-proportion Z test (the significance level was set at 5%). RESULTS: A significantly greater number of cases of ERR (P < .0001) was diagnosed from CBCT images (n = 43, 22.88%) than panoramic radiographs (n = 10, 5.31%). The agreement between the panoramic radiographs and CBCT scans for diagnosing ERR was 4.3%. Mandibular third molars in mesioangular and horizontal inclinations were more likely to cause resorption of the adjacent teeth. CONCLUSIONS: CBCT should be indicated for the diagnosis of ERR in second molars when direct contact between the mandibular second and third molars has been observed on panoramic radiographs, especially in mesioangular or horizontal impactions. Furthermore, considering the propensity of these teeth to cause ERR in second molars, third molar prophylactic extraction could be suggested.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Dente Molar/diagnóstico por imagem , Radiografia Panorâmica/métodos , Reabsorção de Dente , Dente Impactado/diagnóstico por imagem , Humanos
16.
Oral Maxillofac Surg ; 18(4): 419-24, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-23975215

RESUMO

PURPOSE: The objective of this study is to compare the ability of panoramic radiography and cone beam computed tomography (CBCT) in detecting anatomical variations of the mandibular canal and mental foramen. METHODS: One hundred twenty-seven preoperative panoramic and CBCT images were evaluated. Two oral and maxillofacial radiologists investigated the presence of bifid mandibular canals and/or additional mental foramina on the right, left, or both sides of the mandible. Intra- and interobserver reliability was determined using Cohen's kappa coefficient. McNemar's test compared the prevalence of mandibular anatomical variations between panoramic radiography and CBCT. The significance level was set at 0.05. RESULTS: Additional mental foramen and bifid mandibular canal were detected in 1.2 and 7.4 % of the panoramic radiographs and 7.4 and 9.8 % of the CBCT images, respectively. The incidence of anatomical variations on the mandibular canal was not significantly different between both imaging modalities (P > 0.05). CONCLUSIONS: Although CBCT provides better viewing of anatomical structures, including location, shape, and relationship with the surrounding area, panoramic radiography is a conventional imaging modality that can be used in the study of the bifid mandibular canals.


Assuntos
Variação Anatômica , Tomografia Computadorizada de Feixe Cônico/estatística & dados numéricos , Mandíbula/diagnóstico por imagem , Radiografia Panorâmica/estatística & dados numéricos , Humanos , Variações Dependentes do Observador , Reprodutibilidade dos Testes
17.
Surg Radiol Anat ; 35(9): 853-5, 2013 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-23455363

RESUMO

The nasopalatine canal is a relatively long narrow structure located in the midline of the maxilla that contains the nasopalatine nerve and terminal branch of the descending palatine artery. Anatomical variations related to this structure have been reported. This article aimed to report a case of a complete additional nasopalatine canal on a 53-year-old female patient who underwent an examination by cone beam computed tomography. On sagittal slices, it was possible to observe the presence of an additional canal anterior and superior to the nasopalatine canal, separated by a bony septum. Each canal extended from independent superior openings (located in the nasal cavity) to independent openings located in the remaining alveolar process of the anterior maxilla. Identification of individual anatomical variations, especially involving neurovascular structures, plays an important role in the successful outcomes of surgical procedures involving the anterior maxilla.


Assuntos
Maxila/anormalidades , Variação Anatômica , Tomografia Computadorizada de Feixe Cônico , Feminino , Humanos , Maxila/diagnóstico por imagem , Pessoa de Meia-Idade
18.
Braz. j. oral sci ; 12(1): 16-19, jan.-mar. 2013. ilus, tab
Artigo em Inglês | LILACS, BBO - Odontologia | ID: lil-671926

RESUMO

Aim: To compare panoramic radiography and cone beam computed tomography (CBCT) in the diagnosis of bifid mandibular condyle. Methods: The sample consisted of 350 individuals who underwent panoramic radiography and CBCT. In the panoramic radiographs and CBCT images, the presence or absence of bifid mandibular condyle was determined. Results: Presence of bifid mandibular condyle was detected in four cases (1.1%). In all cases, the relation of one condylar process to the other was mediolateral and history of trauma was reported. None of the individuals had symptoms. In two cases, panoramic radiography did not reveal the presence of bifid mandibular condyle. Conclusions: Initial screening for bifid mandibular condyle can be performed by panoramic radiography; however, CBCT images can reveal morphological changes and the exact orientation of the condyle heads.


Assuntos
Humanos , Masculino , Feminino , Articulação Temporomandibular/anormalidades , Côndilo Mandibular/anormalidades , Radiografia Panorâmica , Tomografia/métodos
19.
Clin Oral Implants Res ; 24(10): 1074-7, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22762154

RESUMO

OBJECTIVES: To identify the accuracy of enhancement filters of an intraoral phosphor-plate system for measuring the simulated peri-implant bone level. MATERIALS AND METHODS: A total of 20 titanium implants (Titamax(®) ) were placed into six fragments of bovine ribs and defects simulating bone loss were created. Periapical radiographs were taken with a phosphor-plate system (Vista Scan(®) ) according to the paralleling standard technique, and nine enhancement filters were applied: fine, caries 1, caries 2, perio, endo, noise reduction, invert, emboss, and sculpture. The Friedman test compared the radiographic measurements of the defects to those obtained on the bovine ribs with a digital caliper. Intra- and interobserver agreement was calculated with the intra-class correlation coefficient (ICC). RESULTS: The ICC values showed excellent intra- and interobserver agreement. The caries1, caries2, endo, and perio filters resulted on measurements statistically different from both the original images and the measurements of the digital caliper (P < 0.05). The other filters did not show statistically significant differences from the original images nor from the measurements of the digital caliper. CONCLUSION: In addition to the original images, the fine and emboss filters resulted on the most precise measures. The caries1, caries2, endo, and perio filters were the less accurate for measuring the peri-implant bone level.


Assuntos
Implantes Dentários , Radiografia Dentária Digital/instrumentação , Costelas/diagnóstico por imagem , Ecrans Intensificadores para Raios X , Perda do Osso Alveolar/diagnóstico por imagem , Animais , Bovinos , Implantes Experimentais , Técnicas In Vitro , Intensificação de Imagem Radiográfica , Reprodutibilidade dos Testes , Costelas/cirurgia , Titânio
20.
Artigo em Inglês | MEDLINE | ID: mdl-23217543

RESUMO

OBJECTIVE: To assess the accuracy of cone-beam computed tomography (CBCT) in periimplant fenestration and dehiscence detection, and to determine the effects of 2 voxel sizes and scan modes. STUDY DESIGN: One hundred titanium implants were placed in bovine ribs in which periimplant fenestration and dehiscence were simulated. CBCT images were acquired with the use of 3 protocols of the i-CAT NG unit: A) 0.2 mm voxel size half-scan (180°); B) 0.2 mm voxel size full-scan (360°); and C) 0.12 mm voxel size full scan (360°). Receiver operating characteristic curves and diagnostic values were obtained. The Az values were compared with the use of analysis of variance. RESULTS: The Az value for dehiscence in protocol A was significantly lower than those of B or C (P < .01). They did not statistically differ for fenestration (P > .05). CONCLUSIONS: Protocol B yielded the highest values. The voxel sizes did not affect fenestration and dehiscence detection, and for dehiscence full-scan performed better than half-scan.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Implantes Dentários , Deiscência da Ferida Operatória/diagnóstico por imagem , Análise de Variância , Animais , Bovinos , Interpretação de Imagem Assistida por Computador , Valor Preditivo dos Testes , Curva ROC , Costelas/diagnóstico por imagem , Costelas/cirurgia , Sensibilidade e Especificidade , Titânio
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