Alexander T A, Gibbs C H, Thompson W J
Am J Orthod. 1984 Jan;85(1):21-7. doi: 10.1016/0002-9416(84)90119-2.
A knowledge of chewing provides a better understanding of normal jaw movement and can help form a basis for assessing the effects of malocclusion on jaw function. This study was conducted to describe the effects of deep-bite malocclusion on masticatory function and to determine what changes may occur with orthodontic correction. Five subjects, each exhibiting deep overbite in the early permanent or adult dentition, were selected for this study. Two subjects had Class II, Division 1 malocclusions, and the other three had Class I malocclusions. By means of the "replicator system" jaw movements during border movements and unilateral chewing were recorded and analyzed by computer plots. The typical chewing pattern of all five subjects was characterized by midsagittal opening, wide lateral closing movements, tooth gliding, and a pause at the intercuspal position and during swallowing. Comparison of these findings with chewing data from normal children in previous studies indicated that the deep-bite malocclusion did not create a major disturbance in chewing. Some differences between the preoperative and postoperative condition were noted, however. Prior to treatment, three subjects showed a nearly vertical chewing cycle which avoided tooth contact at the border path. Following treatment, all subjects showed a greater coincidence between the closing chewing path and the lateral border movement. This indicated more gliding tooth contact after treatment. Following deep-bite correction, the border paths showed a refinement of the intercuspal position (IP) and an increased steepness in lateral tooth guidance near IP. The total vertical component of tooth guidance was reduced by treatment.
对咀嚼的了解有助于更好地理解正常的颌骨运动，并可为评估错牙合对颌骨功能的影响奠定基础。本研究旨在描述深覆牙合错牙合对咀嚼功能的影响，并确定正畸矫治可能会发生哪些变化。本研究选取了五名受试者，他们均在恒牙早期或成年牙列期表现出深覆牙合。两名受试者为II类1分类错牙合，另外三名受试者为I类错牙合。通过“复制系统”记录边缘运动和单侧咀嚼过程中的颌骨运动，并通过计算机绘图进行分析。所有五名受试者典型的咀嚼模式特点为矢状面中部开口、广泛的侧向闭口运动、牙齿滑动，以及在牙尖交错位和吞咽时的停顿。将这些结果与先前研究中正常儿童的咀嚼数据进行比较表明，深覆牙合错牙合并未对咀嚼造成重大干扰。然而，术前和术后情况存在一些差异。治疗前，三名受试者表现出近乎垂直的咀嚼周期，在边缘路径处避免牙齿接触。治疗后，所有受试者在闭口咀嚼路径和侧向边缘运动之间表现出更大的一致性。这表明治疗后牙齿滑动接触更多。深覆牙合矫正后，边缘路径显示牙尖交错位（IP）更加精细，IP附近侧向牙齿引导的陡度增加。治疗使牙齿引导的总垂直分量减少。
