Mizuno T
Nihon Hotetsu Shika Gakkai Zasshi. 1989 Feb;33(1):43-56. doi: 10.2186/jjps.33.43.
The purpose of this study is to clarify the relationship between grinding movements during chewing, and lateral excursions starting from the intercuspal position. For this purpose, I measured two different types of three-dimensional mandibular movement; lateral excursions and empty-jaw movement like chewing in 10 subjects, and compared these paths with each other in the lateral occlusal position, when the incisal point is 2.0 mm distant from the intercuspal position. The results can be summarized as follows: 1. The two positions of the incisal point were statistically coincident. 2. The position of both working and non-working side molars during chewing tended to be inferior to that during lateral excursion. 3. The moved distance of the working side condyle during chewing was significantly less than that during lateral excursion. 4. The position of the non-working side condyle during chewing tended to be medial to that during lateral excursion. 5. The difference in the condylar position was deeply related to that in the molar position. The differences mentioned above were considered to be originated from the difference in the masticatory muscle activity and the occlusal contact.
本研究的目的是阐明咀嚼过程中的研磨运动与从牙尖交错位开始的侧方运动之间的关系。为此，我测量了10名受试者的两种不同类型的三维下颌运动；侧方运动和类似咀嚼的空口运动，并在切缘点距牙尖交错位2.0毫米时，在侧方咬合位将这些路径相互比较。结果总结如下：1. 切缘点的两个位置在统计学上是重合的。2. 咀嚼过程中工作侧和非工作侧磨牙的位置往往低于侧方运动时的位置。3. 咀嚼过程中工作侧髁突的移动距离明显小于侧方运动时的移动距离。4. 咀嚼过程中非工作侧髁突的位置往往比侧方运动时更偏向内侧。5. 髁突位置的差异与磨牙位置的差异密切相关。上述差异被认为源于咀嚼肌活动和咬合接触的差异。
