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P 93
Title
DIAGNOSTIC VALuE OF CONE-bEAM COMPuTED TOMOGRAPHy IN ROOT RESORPTION
EVALuATION
Authors
z. DALILI KAJAN 1 , M. TARAMSARI 2 , S.z. MOuSAVI MEHR 3 , F. SALAMAT 4
Affiliations
1 Guilan University of Medical Sciences Dental School, Department of Maxillofacial Radiology,
Rasht, IRAN, 2 Guilan University of Medical Sciences Dental School, Department of Endodontics,,
Rasht, IRAN, 3 Guilan University of Medical Sciences Dental School,, Rasht, IRAN, 4
Guilan University of Medical Sciences, Department of epidemiology, Rasht, IRAN
Body
Objective: External root resorption (ERR) is a response to chronic inflammation. The CBCT field
of view and voxel resolution are effective in diagnostic capability. Thus the aim of this study
was the comparison between standard and HiRes zoom modes in the diagnosis of ERR.
Methods: In this in vitro study, 63 small cavities (0.25 mm depth and 0.5 mm diameter) were
simulated on buccal, lingual and proximal surfaces in three different levels of 16 roots. After
covering the root with nail varnish, the roots were inserted in sockets and fixed in a watercontaining
Lacuna. CBCT scans in both standard and HiRes zoom modes were taken with a
NewTom VG machine. Then, an observer assessed the images to determine the presence or absence
of cavities. These processes were repeated by increasing the size and depth of cavities to
a 0.5 mm depth and to a 1 mm diameter. Data were analyzed by McNemar test. The sensitivity,
specificity, positive predictive value (PPV), negative predictive value (NPV) and likelihood ratio
(LR) of CBCT for evaluation of simulated ERR were calculated.
Results: There was a significant difference between the two imaging modes in diagnosing of
shallow cavities (P=0.02).The sensitivity of the standard zoom in the detection of the shallow
cavities was less than the HiRes zoom. The LR of the HiRes zoom was high for diagnosis of
both cavity types.
Conclusions: This study confirmed that using a smaller voxel size in the CBCT HiRes zoom
mode improved diagnostic ability of ERR.
Keywords
Root resorption,Cone-beam computed tomography,resolution
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