Validity and reproducibility of cephalometric measurements obtained from 2D and 3D cone beam computed tomography images reconstructed / Validade e reprodutibilidade de medidas cefalométricas derivadas da reconstrução de imagens em 2D e 3D de tomografias computadorizadas de feixe cônico

AUTOR(ES)
DATA DE PUBLICAÇÃO

2011

RESUMO

The lateral cephalometric radiography is used as the standard and essential tool for assessing maxillofacial morphology. The main of this study was to test the validity and reproducibility of angular cephalometric measurements of images derived from 2D and 3D reconstruction of cone beam computed tomography, and compared them with measurements obtained in conventional lateral cephalometric radiography. Was evaluated the tomographys and conventional cephalometric images of 58 patients. Two operators, independently at different times, evaluated the conventional cephalometric radiographs and means of measurements was considered the "gold standard". Other three operators performed the evaluation of 2D and 3D reconstructions of volumetric tomography in two different times. It was observed that all modalities has significant differences in the angular measures except: in the modality of virtual radiography RaySum 2D for the SNB angle, lower facial height, facial axis and facial taper; in the modality of virtual radiography 2D maximum intensity, for the measurements SNA, SNB, facial axis, IS inclination and facial taper; in the form of radiography for 3D tomographic images for the facial axis, IMPA and IS inclination, on both sides, the angles SNA and SNB only for the left side. However, even with statistically significant differences found, only the angle FMIA, interincisal, IS inclination and IMPA showed absolute differences between the averages of above 2 ° and 3 °. The correlation between 2D and 3D, and between those with conventional radiographs were excellent. It was concluded that the angular measurements in 2D and 3D images reconstructed from cone beam computed tomography are reproducible and valid, comparing them with measurements obtained from lateral cephalometric radiography, and even though some have shown statistically significant differences, they do not represent values in the relevant clinical cephalometric evaluation as a whole

ASSUNTO(S)

estudos de validação cefalometria radiografia validation studies cephalometry radiography

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