<ORIGINAL ARTICLE>A Morphological Study of Reversed Occlusion Cases with Early Loss of Deciduous Molars

P(論文)This study investigated the influence of severe decay or early loss of the deciduous molars on the craniofacial morphology of reversed occlusion cases in the mixed dentition stage. The materials were composed of cephalograms of 97 reversed occlusion cases (43 males, 54 females) taken at the initial examination. They were divided into a preserved group and an early loss group depending to the preservation of deciduous molars in each stage, and they were compared statistically. 1)In the early loss group, the mandible overdosed with an increasing Gonial angle depending on the decrease in width at the gonial region. As a result the mandible moved foward and the intermaxillary relationship became worse. 2)An early loss of deciduous molars caused the first molar to move foward. The upper first molar moved more foward and downward than the lower first molar. 3)There is no statistically significant difference between the III A and III B stages in the growth pattern of craniofacial morphology.departmental bulletin pape