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This study investigated the relation between occlusal contacts and the main occluding area. The 18 unilateral posterior dental arches were examined. The subjects were instructed to bite a piece of dental stopping once freely where there was easy to bite. A trial was repeated five times. We confirmed the region, where biting of the stopping was concentrated, as the main occluding area. We examined the location of the main occluding area. We divided the subjects into two groups, that is, the group whose biting place of the stopping was corresponding in all of the five trials and the others. We compared the occlusal contacts and the difference of both groups was analyzed quantitatively and qualitatively. As a result, the following conclusions were obtained. 1. The main occluding area was located between upper and lower first molars in many cases. 2. The percentage of the contact area, which was located in the main occluding area, in the total occlusal contacts of the unilateral posterior teeth was 32.6% in the group whose biting place of the stopping was corresponding in all of the five trials. That of the other group was 16.3%. 3. It was suggested that the location of the occlusal contact points, which conducted occlusal force in the direction of the tooth root and brought physiological tooth movement during function, was required conditions for the main occluding area. 抄録 本研究は咬合接触関係 と主機能部位の関係を調べたものである.18側 の臼歯部歯列を被験側 とし た.被 験者に噛みやすい部位でのス トッピングの1回 の噛みしめを行わせ,こ れを各側について5回 行っ た.ス トッピングの噛みしめが集中する部位を主機能部位とした.被 験側を5回 一致群 と4回 以下一致群 に分けた.両 群の咬合接触面積を調べ,そ の違いを定量的に,定 性的に分析 したところ,以 下のような結 果を得た. 連 絡 先:〒113-8549東 京 都 文 京 区湯 島1-5-45 TEL03-5803-5522FAX03-5803-0201 32 顎 機 能 誌13:31-37,2006 1.主 機能部位は上下顎第一大臼歯の機能咬頭間に多く位置していた. 2.主 機能部位内にある咬合接触面積が片側臼歯部全体の咬合接触面積に占める比率Rの 平均値は5回 一 致群で32.6%,4回 以下一致群で16.5%で あった. 3.主 機能部位の要件 として,咬 合接触点の位置,す なわち咬合力を歯の長軸方向へ導き,機 能力による 歯の変位方向が生理的方向となるような咬合接触点の位置が重要な要素であることが示唆された. キーワー ド 主機能部位,咬 合接触,ア クシャルローディング

The main occluding area in consideration of the occlusal relation