The study of essential factors that affect mandibular dental arch forms by cluster analysis
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To elucidate dent al arch morphological characters in young Japanese adolescents. we studied morphological and dimensional characteristics of the dental arch forms in 396 sets of dental stone study models (age: 18-26: ma le: 257. female: 139) . 53 mandibular arches (male: 29. female: 24) in the diagnostic casts of normal dentition and occ1usion were selected and evaluated. We determined midpoints of the incisal ridge of the incisors (Ih. Ih. 12R & 12d. cusp tips of the canines (CR & Cd. summits of buccal cusps of the premolars (Ph. Ph. P2R & P2d. summits of mesiobuccal cusps of the molars (Mh. Mh. M2R & M2d and the midpoint A of line (Ih-Ih) . Point B was defined as the intersection of the vertical line from point A with the line (M2R-M2L). Point E was the intersection of (A-B) with (CR-Cd. The midpoint of line (M2R-M2L : original line) is defined as point O. We examined the mandibular arch forms by estimation of length. angles and the transition of anterior and buccal segments which were represented by items developed from the reference points and lines . The obtained data were studied using a hierarchical c1uster analytic approach: the factor loading of principal components in the c1usters O.e.. pt’ 2nd and 3rd c1usters) were further evaluated By the analyses. we observed significant differences in each c1uster.especially of the arch length. protrusion of canines. degree of curvature of anterior teeth segment and the degree of roundness of the mandibular dental arches. Arch length of the 3rd cluster was longer than that of the other clusters . In addition. we noticed that width differences of the dental arch and anterior segment were useful to distingui sh between the 1st and 2nd clusters . The study concludes that the mandibular dental arch form consisted of essential components of arch length. arch width and the curvature of anterior teeth. Besides. we can effectively divide the mandibular arch form into clusters by dental arch length and width.
Abstract
To elucidate dent al arch morphological characters in young Japanese adolescents. we studied morphological and dimensional characteristics of the dental arch forms in 396 sets of dental stone study models (age: 18-26: ma le: 257. female: 139) . 53 mandibular arches (male: 29. female: 24) in the diagnostic casts of normal dentition and occ1usion were selected and evaluated. We determined midpoints of the incisal ridge of the incisors (Ih. Ih. 12R & 12d. cusp tips of the canines (CR & Cd. summits of buccal cusps of the premolars (Ph. Ph. P2R & P2d. summits of mesiobuccal cusps of the molars (Mh. Mh. M2R & M2d and the midpoint A of line (Ih-Ih) . Point B was defined as the intersection of the vertical line from point A with the line (M2R-M2L). Point E was the intersection of (A-B) with (CR-Cd. The midpoint of line (M2R-M2L : original line) is defined as point O. We examined the mandibular arch forms by estimation of length. angles and the transition of anterior and buccal segments which were represented by items developed from the reference points and lines . The obtained data were studied using a hierarchical c1uster analytic approach: the factor loading of principal components in the c1usters O.e.. pt’ 2nd and 3rd c1usters) were further evaluated By the analyses. we observed significant differences in each c1uster.especially of the arch length. protrusion of canines. degree of curvature of anterior teeth segment and the degree of roundness of the mandibular dental arches. Arch length of the 3rd cluster was longer than that of the other clusters . In addition. we noticed that width differences of the dental arch and anterior segment were useful to distingui sh between the 1st and 2nd clusters . The study concludes that the mandibular dental arch form consisted of essential components of arch length. arch width and the curvature of anterior teeth. Besides. we can effectively divide the mandibular arch form into clusters by dental arch length and width.
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