Comparative Study on Techniques for Measuring Angular Change of Mandibular Condyle in Submentovertex Cephalogram.
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概要
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The purpose of this study was to compare three different methods of measuring angular changes of the mandibular condyle in the horizontal plane. A cephalometer (Model C-166 R: Tokyo Emix Co. Ltd., Japan) along with an apparatus we developed were utilized to obtain submentovertex radiographs. The subjects were placed in a position where the central ray is perpendicular to the Camper plane.<BR>In fifteen subjects with normal occlusion, two submentovertex cephalograms were obtained from each individual at two different times with the teeth in centric occlusion. The following are the three different measuring methods:<BR>(A) "Best fit" method: The outlines of the condyles were traced and superimposed by the "Best fit" of the condyle. Then the angle between two inter-foramina spinosa lines was measured.<BR>(B) "Caliper" method: To determine a condylar long axis by using a sliding digital caliper.<BR>(C) "Perpendicular lines" method: The condylar long axis was determined by using tangent perpendicular lines from an inter-foramen spinosum line to the outline of the condyle. The tangents touch the outline of the condylar shape at the outermost point and the innermost point. A straight line that connects these two points is the condylar long axis.<BR>The condylar long axis was determined by methods (B) and (C). The angle between the condylar long axis and the inter foramina spinosa line (condylar angle) was measured. Then the difference in the condylar angle between the two films was computed.<BR>All films were traced, superimposed, and measured by the same examiner. The results were as follows:<BR>1) The error of measurement of condylar rotation by the "Best fit" method was 1.0°±0.9°by the "caliper" method was 2.5°±2.1°and by the "perpendicular lines method" was 1.9°±1.5°Statistically significant (p<0.01) differences were found when the "Best fit" method was compared with the other two methods.<BR>2) The condylar angle measured with the caliper was 15.7°±8.4°and with the perpendicular lines method was 10.1°±5.4°Statistically significant (p<0.01) differences were found between the two methods as determined by the t-test.<BR>In conclusion, (1) the "Best fit" method was more suitable for measuring condylar rotation than the other conventional methods.(2) The "caliper" method of measuring the condylar angle in the horizontal plane was more suitable than the method using perpendicular lines.
- 特定非営利活動法人 日本顎変形症学会の論文
特定非営利活動法人 日本顎変形症学会 | 論文
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