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P 16<br />
Title<br />
VALIDITy OF ALVEOLAR bONE MEASuREMENTS uSING SINGLE AND STITCHED CbCT<br />
VOLuMES<br />
Authors<br />
E. SOGuR 1 , E. ONEM 1 , b.G. bAKSI 1<br />
Affiliations<br />
1 Ege University, School of Dentistry, Department of Oral & Maxillofacial Radiology, Izmir,<br />
TURKEY<br />
Body<br />
Objective: To validate the accuracy of bone height and width me<strong>as</strong>urements obtained with<br />
single and stitched volumes of a cone beam computed tomography (cbct) system by comparing<br />
them to direct digital caliper me<strong>as</strong>urements.<br />
Methods: Fiducial markers were placed on both lingual and buccal cortical plates of ten dry<br />
mandibles to define different planes. Two different widths and two different heights on anterior<br />
and posterior regions were me<strong>as</strong>ured on Kodak 9000 3D cbct images. Each mandible w<strong>as</strong><br />
scanned 4 times - three for right, anterior, left single volumes and the fourth for the stitched<br />
volume. Total of 480 me<strong>as</strong>urements were made on forty volumes by 3 observers. Gold standard<br />
w<strong>as</strong> determined using caliper me<strong>as</strong>urements. Comparison with the gold standard w<strong>as</strong> done with<br />
Bland and Altman plots. Experimental groups were compared using Dunnett test. Correlation<br />
of me<strong>as</strong>urements w<strong>as</strong> <strong>as</strong>sessed with Pearson’s correlation analysis.<br />
Results: No differences were found in the height and width me<strong>as</strong>urements between single and<br />
stitched volumes for both anterior (pheight=0.95, pwidth=0.63) and posterior (pheight=0.86,<br />
pwidth=0.67) me<strong>as</strong>urements. The mean difference in width me<strong>as</strong>urements w<strong>as</strong> 0.99 mm for<br />
single while it w<strong>as</strong> 1.04 mm for stitched volumes. Mean difference in height me<strong>as</strong>urements<br />
were 0.97 mm and 1.07 mm for single and stitched volumes respectively. The correlation between<br />
observers w<strong>as</strong> 0.972 and 0.964 for posterior; 0.991 and 0.977 for anterior me<strong>as</strong>urements<br />
of single and stitched volumes respectively.<br />
Conclusions: Me<strong>as</strong>urements obtained on the stitched volumes of Kodak 9000 3D show a high<br />
level of agreement with single volume me<strong>as</strong>urements and actual anatomical distances.<br />
Keywords<br />
cone beam CT,dimensional accuracy,stitching<br />
POSTerS<br />
131
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