Association of relatively delayed emergence of mandibular molars with molar reduction and molar position.
Association of relatively delayed emergence of mandibular molars with molar reduction and molar position.
复制标题
下颌磨牙相对延迟出现与磨牙减少和磨牙位置的关联。
DOI：
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发表时间：
1981
影响因子：
2.8
通讯作者：
F. Popovich
中科院分区：
文献类型：
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作者：
D. Anderson;F. Popovich
在伯灵顿生长中心每年检查的234名儿童中，从3岁到20岁，在同一颌骨和两个颌骨中，相对于中切牙和第二前磨牙，永久性第一和第二磨牙的早期和晚期出现顺序有统计学意义的共同发生。另外，下颌磨牙延迟不伴随相应的上颌磨牙延迟，下颌磨牙出现晚于上颌磨牙。这与安氏II类错牙合密切相关，表明相对出现时间与相对磨牙的相对位置之间存在关系。延迟的下颌磨牙相对于继承的牙齿或上颌磨牙与四尖第一和第二磨牙和第三磨牙发育不全的频率增加，表明共同发生的倾向延迟的磨牙出现的时间减少的磨牙的结构。这些关系是显而易见的，即使紧急情况的影响，早期损失的第二颗乳牙，增加M1I1和M2P2序列的早期出现的M1和延迟出现的P2。
Among 234 children examined annually from age three to 20 years at the Burlington Growth Centre, there was statistically significant co-occurrence of early and late emergence sequences of the permanent first and second molars relative to the central incisors and second premolars in the same jaw and in both jaws. Alternatively, mandibular molar delay was not accompanied by corresponding maxillary molar delay, and the mandibular molars emerged later than the maxillary molars. This was strongly associated with Angle Class II malocclusion, indicating a relationship between relative time of emergence and relative position of opposing molars. Delay of the mandibular molar relative to the successional teeth or maxillary molars was associated with increased frequency of four cusped first and second molars and agenesis of third molars, indicating a tendency for co-occurrence of delay in timing of molar emergence with reduction in structure of the molars. These relationships were evident even though emergences were affected by early loss of a deciduous second molar which increased M1I1 and M2P2 sequences by earlier emergence of M1 and delayed emergence of P2.