アブストラクト（39巻2号：The Bulletin of Kanagawa Dental College）

The Bulletin of Kanagawa Dental College

English

Title　： Development of Mandibular Biomechanics in Various Facial Types Using a Longitudinal Growth Sample
Subtitle　： ORIGINAL ARTICLES
Authors　： Chung Woon-Suk, Susumu Akimoto, Sadao Sato
Authors（kana）　：
Organization　： Department of Craniofacial Growth and Development Dentistry, Division of Orthodontics, Kanagawa Dental College
Journal　： The Bulletin of Kanagawa Dental College
Volume　： 39
Number　： 2
Page　： 51-59
Year/Month　： 2011 / 9
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： [Abstract] Development of occlusion during ontogenesis is a complex process. Function of the masticatory organ is affected by numerous environmental factors. However, how these variables change during the transition from deciduous to permanent dentition has yet to be established. Under the hypothesis that mandibular biomechanical function is related to facial skeletal patterns, the present study examined how biomechanical function relates to the relationship between the occlusal plane and condylar position during ontogenesis. A total of 351 cephalometric radiographs from 39 subjects collected annually were used in this study. The sagittal and vertical skeletal patterns of each individual were classified into Class I, II and III and high angle (HA), medial angle (MA) and low angle (LA) groups. The linear and angular measurements of the relation to the occlusal plane (OP) and the condyle (J) were established. The results showed that there were no significant differences in the Class I, II, and III groups, and that the distance between OP and J (DPO) increased with age in all groups. A larger increase was seen in LA and a smaller increase in HA compared with the MA group. The DPO progressively differentiated the groups according to age. No significant differences were found in the distance from the incisal edge of the lower central incisor to the disto-buccal cusp of the lower first molar, but there was a slight decrease in the LA group. The present study showed the importance of the position of the condyle in the inter-relationship between biomechanical function and craniofacial morphology. The distance between the occlusal plane and the condylar point gradually increased from early mixed dentition to permanent dentition. This illustrates the development of efficiency for chewing food.
Practice　： Dentistry
Keywords　： DPO, Hyperdivergency, Occlusal Plane, Biomechanics