Masticatory movements of the mandible around the terminal position in children with primary dentition.
スポンサーリンク
概要
- 論文の詳細を見る
The purpose of this study was to investigate the characteristics of the movement at the lower incisal point around the occlusal phase during gum-chewing movement in children with primary dentition. Mandibular movement was measured using the TRI-MET, which is an opto-electronic analysis system with six degrees-of-freedom at a sampling frequency of 100 Hz. This measurement data was transferred to a graphics workstation via a personal computer and Ethernet. The subjects were categorized according to their age into two groups. The subject group for children with primary dentition consisted of 12 children, 4 boys and 8 girls, ranging in age from 4 to 6 years. These subjects had no dental caries, or had slightly restored teeth, did not have any trouble with, occlusion, or mandibular function, and had no history of orthodontic treatment. The subject group for the adults with permanent dentition consisted of 18 women, ranging in age from 19 to 27 years, and had a normal occlusion with no history of orthodontic treatment. Each subject was instructed to chew the gum freely from maximum intercuspal position for twenty seconds. The entire chewing movement was divided into cycles at the lower position of the movement to prevent from damaging the occlusal phase. Cycles were classified into four patterns according to their closing and opening pathways. Both closing and opening pathways were classified based on their preferred and non-preferred sides.<BR>A three-dimensional velocity curve was estimated by using multilevel model analysis.<BR>As a result, the gum-chewing movement in children with primary dentition was characterized as below:<BR>1) 80% of cycles were chewed on the preferred side, <BR>2) only 35% of cycles used both preferred side and non-preferred side in children, however, 65% of adults used both sides, <BR>3) the speed in children was faster than in adults, <BR>4) the difference of the velocity between types was smaller than that of between groups.<BR>These characteristics might be related to their morphological specific feature, shallow occlusal relationship, flat occlusal plane and/or shallow fossa and flat eminence relationship of the condyle. (334words)
- 日本顎口腔機能学会の論文
日本顎口腔機能学会 | 論文
- 1. 咬合接触と咀嚼機能(第30回学術大会)
- 骨格性下顎前突の外科的矯正治療前後における下顎運動の変化
- 11.骨格性下顎前突症患者における嚥下時筋活動パターンの定量的評価
- 日本顎口腔機能学会第31回学術大会報告
- 5. 顎関節の潤滑メカニズムに関する咬合の影響(第31回学術大会)