RESUMO
OBJECTIVE: To determine the accuracy of various cone beam computed tomography (CBCT) devices in assessing the buccal bone in anterior teeth. MATERIAL AND METHODS: A skull encased in tissue equivalent material was imaged with six CBCT devices: 3D Accuitomo 170 (J. Morita, Japan), CS 9000 3D (Carestream Dental, France), CS 9300 (Carestream Dental, France), Eagle 3D (Dabi Atlante, Brazil), i-CAT Classic (Imaging Sciences International, USA) and Orthophos XG 3D (Sirona Dental System, USA). The exposure and acquisition protocols were determined using the manufacturer's guidelines, the voxel size adjusted as close as possible to 0.2 mm. Cross-sectional images were evaluated randomly, and the buccal bone was assessed. RESULTS: The statistics were calculated based on a logistic regression model with the significance level set at 5%. All CBCT devices showed high accuracy; however, observers noted that the accuracy and sensitivity of CS 9300 device were slightly superior. CONCLUSION: The diagnostic performance of all CBCT devices was high for the evaluation of buccal bone in anterior teeth. When the clinical usefulness of an imaging modality is equivalent, the choice of appropriate imaging should be directed towards the modality that delivers the least radiation dose to the patient for a specific diagnostic task.
Assuntos
Tomografia Computadorizada de Feixe Cônico , Mandíbula , Maxila , Tomografia Computadorizada de Feixe Cônico/métodos , Estudos Transversais , Humanos , Processamento de Imagem Assistida por Computador , Imageamento Tridimensional , Mandíbula/anatomia & histologia , Mandíbula/diagnóstico por imagem , Maxila/anatomia & histologia , Maxila/diagnóstico por imagemRESUMO
OBJECTIVES: To evaluate the effect on diagnostic yield in the detection of experimentally induced vertical root fractures on cone beam CT images using four dental software program. METHODS: 190 single-rooted extracted human teeth were divided into three groups according to the pulp canal status: unrestored (UR), filled with gutta-percha (GP) and restored with a metallic custom post (Post). One-half of the sample of each group was artificially fractured and the segments repositioned. All teeth were scanned on a cone beam CT device at 0.2 mm nominal voxel resolution (i-CAT Platinum; Imaging Sciences International, Hatfield, PA). The data were exported as digital imaging and communications in medicine files and imported into Dolphin Imaging & Management Solutions, v. 11.5 (Patterson Dental Supply Inc., St Paul, MN), InVivoDental, v. 5.0 (Anatomage Inc., San Jose, CA) and Kodak Dental Imaging Software 3D module, v. 2.1.11 (Carestream Health Inc., Rochester, NY) software. Cross-sectional images in the acquisition (using Xoran CAT™, v. 3.0.34 software; Xoran Technologies, Ann Arbor, MI) and additional software were presented to three calibrated oral radiologists who rated the presence or absence of root fracture on a five-point scale. Receiver operating characteristic analysis was performed, and treatment comparisons compared by analysis of variance and pairwise comparisons were performed using Tukey's test at an a priori value of α < 0.05%. RESULTS: All dental software performed equally at detecting fractures. Fractures were significantly more difficult to detect when posts were present. CONCLUSIONS: The diagnosis of root fracture is software-independent. The presence of an intracanal metallic post significantly decreases the detection of artificially created root fractures.
Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Interpretação de Imagem Radiográfica Assistida por Computador , Software , Fraturas dos Dentes/diagnóstico por imagem , Raiz Dentária/diagnóstico por imagem , Raiz Dentária/lesões , Análise de Variância , Cavidade Pulpar/diagnóstico por imagem , Humanos , Técnica para Retentor Intrarradicular , Curva ROC , Interpretação de Imagem Radiográfica Assistida por Computador/métodos , Sistemas de Informação em Radiologia , Obturação do Canal Radicular , Estatísticas não Paramétricas , Fraturas dos Dentes/patologiaRESUMO
Three-dimensional images of craniofacial structures are reconstructed from conventional CT scans with the use of special computer software. These reconstructed images do not exhibit magnification nor superimposition of CT scans of structures. Quantitative measurements of three-dimensional craniofacial structures can be very precise. This technique has broad applications in the field of special patient care and is demonstrated in a case report of hemimandibular hyperplasia.