The authors investigated the accuracy and reliability of three-dimensional and reformatted computed tomographic images by comparing direct measurements on the dry mandible and the measurements on three-dimensional and reformatted computed tomographic images of the dry mandible. 29 Korean dry mandibles were imaged and 16 items of measurements were measured. The results were as follows; 1. The correlation coefficients between the two methods were between 0.95 and 0.99, except for the measurement of Go-Pg. 2. The mean differences of the measurements between the two methods ranged from -0.52 to 0.42 mm and the range of standard deviations for these mean differences was 0.28 to 2.70 mm. 3. Of the difference scores in total measurements, 75.9% were within 1 mm and 95.9% were within 2mm. In conclusion, the agreement between the two methods was excellent and the measurements of the threedimensional and reformatted computed tomographic images were reliable. The three-dimensional and reformatted computed tomographic images can be an useful method in anthropologic study.
Mandible*

No abstract available.
Mandible*

PURPOSE: To evaluate the precision of measurements of distances and angle in the cross-sectional views of linear tomogram of panorama and to assess the technique for visualizing the mandibular canal. METHODS: Ten dry mandibles were radiographically examined with 3 continuous cross-sectional views of linear tomogram of panorama and 4 continuous computed tomograms. The distance between the superior border of canal and alveolar crest and the bucco-lingual width of alveolar bone at the level of the superior border of canal and the angle between the two lines above were measured. Measurements were performed by radiologist and implantologist group and compared with measurements on computed radiograms of the same areas. RESULTS: The measurements differences for the distance of alveolar bone height between in panorama and in CT showed 0.9mm+/-0.6mm by radiologists and 1.3mm+/-0.8mm by implantologists. There was no statistically significant difference between two groups' measurements. The differences in measurements for the distance of alveolar bone width between in panorama and in CT showed 0.5mm+/-0.8mm by radiologists and 2.5mm+/-1.4 mm by implantologists. There was significant difference (p<0.05) between two groups' measurements. The average bucco-lingual inclination of alveolar bone above mandibular canal was average 95.8degrees in CT. The difference of measurements between two groups was average 1+/-0.9degrees. Three cross-sectional views of panorama could show that the mandibular canal crosses antero-lingually and slopes inferiorly from the posterior segment of the mandible. Conclusions : The measurements in the linear tomogram of panorama by radiologists gave the accurate values of the distances and the angle compared with the values in computed tomograms.
Mandible*

PURPOSE: To evaluate the precision of measurements of distances and angle in the cross-sectional views of linear tomogram of panorama and to assess the technique for visualizing the mandibular canal. METHODS: Ten dry mandibles were radiographically examined with 3 continuous cross-sectional views of linear tomogram of panorama and 4 continuous computed tomograms. The distance between the superior border of canal and alveolar crest and the bucco-lingual width of alveolar bone at the level of the superior border of canal and the angle between the two lines above were measured. Measurements were performed by radiologist and implantologist group and compared with measurements on computed radiograms of the same areas. RESULTS: The measurements differences for the distance of alveolar bone height between in panorama and in CT showed 0.9mm+/-0.6mm by radiologists and 1.3mm+/-0.8mm by implantologists. There was no statistically significant difference between two groups' measurements. The differences in measurements for the distance of alveolar bone width between in panorama and in CT showed 0.5mm+/-0.8mm by radiologists and 2.5mm+/-1.4 mm by implantologists. There was significant difference (p<0.05) between two groups' measurements. The average bucco-lingual inclination of alveolar bone above mandibular canal was average 95.8degrees in CT. The difference of measurements between two groups was average 1+/-0.9degrees. Three cross-sectional views of panorama could show that the mandibular canal crosses antero-lingually and slopes inferiorly from the posterior segment of the mandible. Conclusions : The measurements in the linear tomogram of panorama by radiologists gave the accurate values of the distances and the angle compared with the values in computed tomograms.
Mandible*

No abstract available.
Mandible*

No abstract available.
Mandible*

No abstract available.
Mandible*

No abstract available.
Mandible* ; Osteoblastoma*

No abstract available.
Mandible* ; Osteoblastoma*

No abstract available.
Mandible* ; Spine*