The korean journal of orthodontics (대한치과교정학회지)
- Volume 26 Issue 6
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- Pages.657-666
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- 1996
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- 2234-7518(pISSN)
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- 2005-372X(eISSN)
A COMPARATIVE STUDY OF THE ANGLES BETWEEN CROWN AXIS AND ROOT AXIS IN MESIODISTAL DIRECTION BY USING ORTHOPANTOMOGRAM
Abstract
Orthopantomogram is commonly used to evaluate root parallelism. "Good parallelism" between roots is widely accepted as one of the guidelines of a successful orthodontic treatment. In case there was a large angle between crown axis and root axis, and if we valued only the position of crown in establishing occlusal relationship without considering of the situation of root, the problem of root arrangement between adjacent teeth would be occurred. The estimate of root parallelism in mesiodistal direction before and after orthodontic treatment must be emphasized. The intent of this study was to determine the clinical importance and correlation of the angle between crown axis and root axis. Orthopantomograms of 105 orthodontic patients being treated in Yonsei university were used in this study. Twenty-eight teeth in both maxilla and mandible were selected and analyzed quantitively to evaluate the angle between crown axis and root axis, and obtain the correlationship among the individual teeth. The results are as follows: 1. Among the teeth presenting normal distribution, the maxillary right canine showed the largest mean value(