Acurácia de dois tomógrafos na detecção de fraturas radiculares verticais em dentes com retentores metálicos intracanais
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2017-03-10
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Universidade Federal de Goiás
Resumo
Vertical root fracture (VRF) is a dental lesion with worse prognosis in dentistry, the diagnosis is made from clinical evaluation, and image exams, clinically the symptoms are signaled and not pathognomonic and even with the introduction of cone beam computed tomography, the metallic artifacts resulting from the images obtained still make it difficult to detect VRF. The aim of this study was to evaluate the accumulation of Eagle 3D and i-Cat tomography in the detection of VRF in endodontically treated single-root teeth with post metallic intracanal. This study was approved by the Research Ethics Committee of UFG under the number 477.315. 30 single-root teeth were endodontically treated and prepared with metal pins. The sample was divided randomly in Control Group (CTL) and Fractured Group (FRT). The fractures were made only in FRT Group by the Universal Test machine, with load cell 500N and speed of 1mm/ min. The teeth were placed in dry jaw and placed in a vessel with distilled water to be purchased as TCFC images by Eagle 3D tomographs (protocol 1: FOV 5X5 cm and voxel: 0.1 mm - protocol 2: FOV 6X8 cm and voxel: 0.16 mm) and i-CAT (protocol 3: FOV 8 × 8 cm and voxel: 0.125 mm - protocol 4: FOV 8 × 8 cm and voxel: 0.2 mm). Two experienced evaluators classified as composite images by absence of fracture or by subjective revisions of an interference of the formation of non-diagnostic artefacts and reconstruction type and efficient in the detection of VRF. The inter-examiner agreement was verified by kappa test. Measurements of sensitivity, specificity and accuracy were adopted for each device. The area under the ROC curve was also calculated and compared using the ANOVA. The results indicated that protocols 1 and 3 were more accurate (AUC protocol 1: 0.784 - p <0.05 and AUC protocol 2: 0.729 - p <0.05). According to the subjective evaluation of the examiners, in protocols 1 and 4 of greater interference of the formation of artifacts without diagnosis of VRF and a parasagittal reconstruction was the most efficient for a detection of the fracture line. It is concluded that protocols 1 and 3 highlight a better performance in the detection of VRF and that the size of voxel is a factor that directly influences the accuracy.
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SIQUEIRA, C. F. O. Acurácia de dois tomógrafos na detecção de fraturas radiculares verticais em dentes com retentores metálicos intracanais. 2017. 66 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2017.