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在上门牙拥挤排列不整齐的类型中,有的孩子中间两颗大门牙长得靠外,左右两边的小门牙长得靠里。这类牙齿错位在医学上称为大小门牙唇、舌(腭)向错位。(详见左边照片) 发生这种牙齿拥挤错位的原因,是因为一些孩子的上颌骨骼生长得不好,发育得不够。上颌骨骼牙槽弓狭小与遗传因素有关。由于遗传基因的作用,父母上下颌骨骼牙槽弓狭小,门牙拥挤排列不整齐的,会遗传给子女,使孩子的上下领骨骼也小,牙齿也会排列不整齐。当然,造成牙齿错位还有其他因素的影响,例如造成左边照片上这个孩子上面四颗大小门牙错位的原因,除受父母遗传因素的影响外,还有吮指的不良习惯。中间两颗大门牙凸出得比较厉害,与其吮指到5岁多有关。另外,也与其生长发育期间吃的
In the type of incontinence in the front teeth crowded, some of the children in the middle of the two large front teeth rely on outside, left and right sides of the small incisors grow in the long. Such dislocation of teeth in medicine is called the size of the incisors lips, tongue (palate) to the wrong place. (See photo on the left) The reason for this crowded dislocation is that some of the children's maxillary bones do not grow well and develop poorly. The maxillary alveolar arch is related to genetic factors. Due to the role of genes, parental jaw mandibular alveolar bow is narrow, incisors arranged in irregular crowded, will be passed to their children, so that the child's upper and lower collar bone is also small, the teeth will be arranged irregularly. Of course, the cause of tooth dislocation and other factors, such as causing the left photo above the size of the child above the four incisors reason, in addition to the genetic factors of parents, there sucking bad habits. In the middle of the two front teeth prominent, rather than sucking to 5 years old and more. In addition, it is also eaten with its growth and development