The effect of mandibular position on measurement in spiral tomography.
- Author:
Yun Hoa JUNG
1
Author Information
1. Department of Oral and Maxillofacial Radiology, College of Dentistry, Pusan National University, Korea. yhjung@pusan.ac.kr
- Publication Type:Original Article
- Keywords:
Tomography;
X-ray;
Mandible;
Dental Implants
- MeSH:
Dental Implants;
Humans;
Mandible;
Radiography, Dental, Digital
- From:Korean Journal of Oral and Maxillofacial Radiology
2005;35(2):83-86
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: To evaluate the effect of deviation of mandibular positioning, by changing the mandibular plane inclination, on the measured height and width of mandible in spiral conventional tomography. MATERIALS AND METHODS: By means of the Scanora multifunctional unit, cross-sectional tomograms were taken from two human dried mandibles at the mandibular angulations: -15 degrees, -10 degrees, -5 degrees, and 0 degree. Twenty-eight sites in two dried mandibles were imaged. One examiner measured the bone heights and widths at selected sites on the images and the actual bone heights were recorded. RESULTS: The bone heights at the four mandibular inclinations overestimated real bone heights and the mean difference between actual heights and image heights on 0 degree was the smallest (P< 0.01). The bone widths on -15 degrees were narrowest and there were significant differences between bone widths measured at the four mandibular inclinations (P< 0.001). We found statistically significant differences between both bone heights and widths as measured according to the mandibular plane angle for the posterior region (P< 0.01). CONCLUSION: The use of different mandibular positioning may result in discrepancies in heights and widths when measured from the cross-sectional tomographic images. It is suggested that the mandibular positioning may play a significant role in the measurement of mandibular heights and widths.
