A study on occlusion of subjects with skeletal class III malocclusion. Part 1. Positional relation between occlusal surfaces of upper and lower molars during protrusive excursion.
A study on occlusion of subjects with skeletal class III malocclusion. Part 1. Positional relation between occlusal surfaces of upper and lower molars during protrusive excursion.
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骨性Ⅲ类错牙合受试者咬合研究。
DOI：
10.2186/jjps.34.921
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
S. Iwakata
中科院分区：
文献类型：
--
作者：
S. Iwakata
患有骨性III类错牙合的受试者在治疗前必须对牙合和下颌运动进行评价。然而，它们的三维特征还没有得到澄清。因此，我调查了他们的移动和磨牙的咬合关系，从三维的角度来看，关于这个运动，我测量了7名受试者的切牙和髁突路径的倾斜度。关于这种咬合关系，我测量了牙尖交错位和咬合过度位下磨牙的每个牙尖与其对立面之间的距离。结果如下：（1）平均而言，各径线的矢状倾角较正常人平缓，（2）牙尖交错位时，牙尖与对牙面的距离有大于正常人的趋势。结果表明，在前伸位时，两组牙尖间距离无显著性差异，前伸位时磨牙无过度脱位，前伸位是通过切径和髁径的平缓倾斜实现的。
Subjects who have skeletal class III malocclusion must have both the occlusion and jaw movements evaluated before treatment. Their three-dimensional features, however, have not been clarified. I therefore investigated their protrusive excursion and the occlusal relationship of molars, from a three-dimensional standpoint.Regarding this movement, I measured the inclinations of the incisal and condylar paths in seven subjects. Regarding this occlusal relationship, I measured the distance between each cusp-tip of the lower molars and its opposing surface in both the intercuspal position and the protrusive occlusal position.The results were as follows: 1) the sagittal inclinations of the paths were gentler than those of normal subjects, on average, 2) the distance between the cusp-tip and its opposing surface tended to be greater than those of normal subjects in the intercuspal position. In the protrusive occlusal position, however, there was no significant difference in the distance between the cusps in the two groups.The results mentioned above show that among the subjects examined there were no excessive disclusion of molars in the protrusive occlusal position, which was attained by gentle inclinations of both the incisal path and the condylar path.