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Impact of CBCT image quality on the confidence of furcation measurements.

BACKGROUND
To investigate the impact of scanning parameter in cone-beam computed tomography (CBCT) images on accuracy and confidence with measurements of furcation involvement (FI) in maxillary molars.


MATERIAL AND METHODS
Six half cadaver heads with present maxillary molars (n=10) were available. CBCT scans with the fixed parameter field of view (4x4cm, 12x17cm) amperage and voltage (4mA, 90kV) and with varying scan modes (SM), i.e. images/scan (IS), voxel sizes (VZ), rotation (R) were performed using one CBCT apparatus. The images were analyzed by two calibrated investigators. Horizontal FI`s were measured in mm or a "through and through" destruction (FI degree III) was recorded. Each rater scored the FI measurements performed in each scan as «confident» or as «not confident». Data were statistically analyzed using Chi-Square tests.


RESULTS
The agreement between CBCT-FI measurements and intrasurgical FI measurements varied according to SM (SM HiSp 180°, 0.08: kappa 0.538, CI;95%: 0.362-0.714; SM Std. 360°, 0.25: kappa 0.698, CI;95%: 0.534-0.861). The number of measurements scored as "confident" varied according to SM (SM Std. 360°, 0.08: 52 out of 60 measurements; SM Std. 360°, 0.25: 16 out of 60 measurements) (p <0.001).


CONCLUSIONS
SM of CBCT significantly affect the confidence with FI measurements in maxillary molars.