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KMID : 0361920070370020114
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Korean Journal of Orthodontics
2007 Volume.37 No. 2 p.114 ~ p.124
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Change in tooth length and angulation on panoramic radiographs taken at different labiolingual and buccolingual inclinations
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Choi Gab-Lim
Kim Jae-Deok
Kim Kwang-Won
Lim Sung-Hoon
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Abstract
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Objective: The purpose of this study was to examine how the mesio-distal angulation and the length of each tooth changes on panoramic radiograph at different bucco-lingual inclinations.
Methods: After constructing an acrylic model based on the mean arch of 30 adults with normal occlusion, the wire was placed in the center of the teeth on the acrylic model. First, the wire was implanted in normal angulation and inclination and a panoramic radiograph taken. After changing the inclination from I-5^{circ};to;I+15^{circ};by;5^{circ}, a panoramic radiograph was taken again and the mesio-distal angle and wire length on the panoramic radiograph were assessed.
Results: When the wire was implanted at the normal angulation and inclination, the length measured in the panoramic radiograph was magnified 111{sim}117% from the original length in the anterior region and 121{sim}125% in the posterior region. Only the central and lateral incisors showed significant length differences when the inclination was changed from l-15^{circ};to;I+15^{circ} at fixed angulation. When the inclination was changed from l-15^{circ};to;I+15^{circ}, the angulation of most teeth on panoramic radiograph appeared to be more disto-angulated than in reality, and the lateral incisor and canine showed the largest difference. Only l-15^{circ};to;I+15^{circ} groups of premolars and I+15^{circ} group of molars showed more mesio-angulation than in reality. As the labio(bucco)lingual inclination of all teeth were decreased, tooth angulation in the panoramic radiograph appeared to be more disto-angulated.
Conclusion: The labio-liugual inclination of teeth should be considered because it affects panoramic image of teeth, such as length of incisors and angulation of other teeth.
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KEYWORD
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Panoramic radiograph, Angulation, Inclination, Tooth length
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