Early developmental traits in class II malocclusion.
Early developmental traits in class II malocclusion.
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DOI：
10.1080/000163598428356
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发表时间：
1998
影响因子：
2
通讯作者：
J. Varrela
中科院分区：
文献类型：
--
作者：
J. Varrela
乳牙列II类咬合的咬合特征包括第二乳磨牙远端端平面、远端犬齿关系、大的复喷、大的复咬合。其他表现为上牙弓和上颌基牙狭窄，前牙间距小。在骨骼上，II级儿童与正常儿童的差异较小。颅底，包括底屈和上颌骨正常。下颌体和下颜面高短，角大，下颌牙槽位后移。支的高度是正常的，下颌骨的骨骼位置也是正常的，除了下巴，它在5岁以后变得稍微向后缩。由于大多数II类咬合的骨骼特征发育晚于咬合特征，因此没有证据表明在乳牙列中存在骨骼II类生长模式。上颌骨横向生长和下颌骨矢状生长的缺陷似乎是导致典型的II类咬合的原因。进一步的骨骼变化很可能作为次级适应而发展。
The occlusal traits of Class II occlusion in the deciduous dentition include distal terminal plane of the second deciduous molars, distal canine relation, large overjet, and large overbite. Other findings are narrow upper dental arch and maxillary base and poor anterior spacing. Skeletally, Class II children differ less from normal children. The cranial base, including the base flexure, and the maxilla are normal. The mandibular corpus and lower facial height are short, the gonial angle is large, and the dentoalveolar position of the mandible is retruded. The height of the ramus is normal, as is the skeletal position of the mandible, with the exception of the chin, which becomes slightly retruded after 5 years of age. As most skeletal traits of Class II occlusion develop later than the occlusal characteristics, it is suggested that no evidence can be found for a skeletal Class II growth pattern in the deciduous dentition. The deficient transversal growth of the maxilla and the sagittal growth of the mandible seem to cause the typical Class II occlusion. Further skeletal changes are likely to develop as secondary adaptations.