Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, Tokyo, Japan.
J Oral Rehabil. 2009 Apr;36(4):250-6. doi: 10.1111/j.1365-2842.2009.01938.x. Epub 2009 Feb 10.
The purpose of this study is to clarify whether the state of occlusal contact on lateral excursion is related to the pattern of masticatory movement path. The masticatory movement during mastication of softened chewing gum and the occlusal contact on lateral sliding of the mandible by 1 mm (L1), 2 mm (L2) and 3 mm (L3) were recorded in 50 healthy subjects. The path of masticatory movement was classified into one of seven patterns. The number of teeth involved in the occlusal contact in each pattern was investigated and compared among different lateral occlusal positions. The occlusal contact was then classified into 15 types based on one or a combination of the following four regions; incisal region, canine region, premolar region and molar region. The number of occlusal contact type for each pattern was investigated and compared among patterns. The number of teeth involved in occlusal contact decreased as the degree of lateral excursion increased, and significant differences were observed among the lateral occlusal positions (P < 0.001). The occlusal contact tended to decrease in the molar region and increase in the canine or premolar regions as the degree of the lateral excursion increased. When comparing among patterns, significant differences were observed at L2 and L3 (L2; P < 0.001, L3; P = 0.030) but not at L1 (P = 0.318). The difference was remarkable at L2. It was suggested that the state of occlusal contact at L2 and L3, particularly at L2 was related to the masticatory path pattern.
本研究旨在阐明在侧方滑行时的咬合接触状态是否与咀嚼运动轨迹的模式有关。本研究记录了 50 名健康受试者在咀嚼软化口香糖时的咀嚼运动以及下颌在 1mm（L1）、2mm（L2）和 3mm（L3）侧方滑动时的咬合接触。根据咀嚼运动轨迹的模式将其分为七种类型之一。调查了每种模式中涉及的咬合接触的牙齿数量，并比较了不同侧方咬合位置之间的差异。然后根据一个或多个以下四个区域（切牙区、尖牙区、前磨牙区和磨牙区）的组合，将咬合接触分为 15 种类型。调查并比较了每种模式的咬合接触类型的数量。随着侧方滑行程度的增加，咬合接触的牙齿数量减少，并且在不同的侧方咬合位置之间存在显著差异（P < 0.001）。随着侧方滑行程度的增加，咬合接触倾向于在磨牙区减少，在尖牙或前磨牙区增加。在比较不同模式时，在 L2 和 L3 时观察到显著差异（L2：P < 0.001，L3：P = 0.030），但在 L1 时没有差异（P = 0.318）。在 L2 时差异显著。结果表明，L2 和 L3 处的咬合接触状态，特别是 L2 处的咬合接触状态与咀嚼路径模式有关。
