咀嚼時の食物の流れと咬合面形態の関連性に関する研究

咀嚼过程中食物流动与咬合面形态关系的研究

• 批准号: 09771683
• 负责人: 木戸 寿明
• 金额: $ 1.22万
• 依托单位: Niigata University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Encouragement of Young Scientists (A)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-09771683/
• 关键词: 咀嚼; 咬合面形態; 圧搾空間; 咀嚼能率

咀嚼時に口腔内に取り込まれた食物は上下顎の歯により圧縮,粉砕を受け,唾液と混和され嚥下に至る.そこで,下顎機能運動時の上下顎歯の対合関係を測定し,機能時の上下顎咬合面間の接触と離解の様相を3次元的に把握し,咬合面形態が食物の粉砕と流れにどのように関与しているかを明らかにし,咬合面形態の機能的意義を追求することを目的とした.今回は特にこれまでに分析の行われていなかった下顎臼歯に関して検討を行った.歯に極度な咬耗や修復物の存在しない,咬合関係が正常な成人8名の咬合面形状データをコンピュータ上で処理解析を行った.同時に各被験者の下顎運動も測定し,下顎が咬頭嵌合位,1mm側方位,2mm側方位にあるときの上下顎歯間の距離を算出し,カラーマップを用いて表示,観察を行った.その結果,下顎臼歯上において特徴ある傾向が認められた.下顎第一大臼歯では遠心咬頭から中心窩にかけての部分が,また下顎第2小臼歯では頬側咬頭三角隆線から遠心小窩にかけての部分に下顎側方位において空間が形成され,咬頭嵌合位においてはその空間が消失していた.上顎においても側方位において同様の空間,すなわち圧搾空間が形成されることと考え合わせると,正常な咬合関係を有する天然歯では第一大臼歯と第2小臼歯において食物の粉砕,圧搾を行うと同時に,食物を舌側へと移動させ,食塊の形成を合理的に行い得る機構を有していることが示唆された.

When chewing, food is taken from the mouth, compressed by the upper and lower jaws, powder is absorbed, saliva is mixed and swallowed. In this paper, the relationship between the upper and lower jaw teeth during mandibular functional movement was determined, the contact and dissociation phase between the upper and lower jaw occlusal surfaces during mandibular functional movement was grasped in three dimensions, the occlusal surface morphology was related to the flow of food powder, and the significance of occlusal surface morphology and function was pursued. This time around, we're going to analyze the behavior of the mandible and the behavior of the mandible. The occlusal surface shape of 8 adults with normal occlusion relationship was analyzed. At the same time, the jaw movement of each subject was measured, and the jaw was inserted into the head,1mm lateral orientation,2mm lateral orientation, and the distance between the upper and lower jaws was calculated. As a result, the mandibular condyle has a tendency to change. The distal occlusal fossa of the mandibular first major tooth is formed in the middle of the occlusal fossa, and the distal occlusal fossa of the mandibular second minor tooth is formed in the middle of the occlusal fossa, and the occlusal mosaic is formed in the middle of the occlusal fossa. The same space is formed in the lateral direction of the upper jaw, so that a pressing space is formed. However, when considering the combination, natural teeth have a normal occlusion relationship. The first large molar tooth and the second small molar tooth are used to crush the powder of food. At the same time, the food moves laterally and lingually, so that the formation of the food mass can be achieved in a reasonable manner.