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Dentomaxillofacial Radiology, Vol 26, Issue 3 189-191, Copyright © 1997 by British Institute of Radiology

ARTICLES

Effect of axial plane deviation on cross-sectional height in reformatted computed tomography of the mandible

D. Kohavi, J. Bar-Ziv and Y. Marmary
Department of Prosthodontics, Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel.

OBJECTIVE: To assess the effect of angular deviation on the measured height of the mandible in reformatted cross-sectional CT scans. METHODS: Reformatted cross-sectional CT scans were obtained from three dried mandibles, at three angulations, in a special holding and positioning device for perpendicular measurements. The radiographic lengths of 321 measurements were compared with the actual bone length. RESULTS: The mean difference between actual bone length and image length, with transaxial planes parallel to the lower border, was 0% (s.d. 3.6). Deviations of 10 degrees and 20 degrees from the lower border of the mandible resulted in a mean error of 1% (s.d. 4.5) and 2.8% (s.d. 8.0) respectively. When the angulation between the deviated transaxial plane and the lower border was greater than 10 degrees, the maximum error was about +/- 30%. CONCLUSION: The use of different transaxial planes along the mandible may result, in a small proportion of cases, in discrepancies in height when measured from the cross-sectional images obtained. This may lead to incorrect interpretation of the depth of bone available for implants.


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J. Dantas, A Montebello Filho, and P. Campos
Computed tomography for dental implants: the influence of the gantry angle and mandibular positioning on the bone height and width
Dentomaxillofac. Radiol., January 1, 2005; 34(1): 9 - 15.
[Abstract] [Full Text] [PDF]


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