Influence of voxel size in the diagnostic ability of cone beam tomography to evaluate simulated external root resorption.
This study assessed in vitro the diagnostic ability of cone beam computed tomography (CBCT) scans with different voxel resolutions in the detection of simulated external root resorption (ERR). For that purpose, 59 teeth were viewed through iCAT tomography (Imaging Sciences International, Inc, Hatfield, PA) following three protocols in which the variation was the voxel resolution (0.4, 0.3, and 0.2mm). A calibrated examiner blinded to the protocol assessed the images through the i-CAT View software (Imaging Sciences International, Inc). The chi-square statistical analysis did not show associations between voxel resolution, section plane, size of cavity, and radicular third. Sensitivity and specificity values were similar. However, likelihood ratio values of 6.4 for a 0.4-mm voxel, 16 for a 0.3-mm voxel, and 12 for a 0.2-mm voxel were found. It was concluded that CBCT is a reliable method for the investigation of simulated ERR, and a 0.3-mm voxel appeared to be the best protocol, associating good diagnostic performance with lower X-ray exposure.
Liedke
Gabriela Salatino
GS
Department of Surgery and Orthopedics, School of Dentistry, Federal University of Rio Grande do Sul (UFRGS), Brazil.
da Silveira
Heloísa Emília Dias
HE
da Silveira
Heraldo Luis Dias
HL
Dutra
Vinícius
V
de Figueiredo
José Antônio Poli
JA
D054893:Cone-Beam Computed Tomography; D006801:Humans; D007180:Incisor / Q000000981:diagnostic imaging; D016013:Likelihood Functions; D011829:Radiation Dosage; D012391:Root Resorption / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity