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观察现在的孩子和青少年,上下门牙排列不整齐的发生率很高。不仅上门牙拥挤,排列不齐,而且下门牙也排列得“里出外进”。图1展示的即是一个下门牙轻度拥挤的病例(牙与牙之间的拥挤量为2毫米)。从临床观察来看,下门牙拥挤且排列不齐,大都与上门牙拥挤、“虎牙”错位或排列不齐密切相关。其发生原因,除受遗传因素影响外,还直接受到上颌牙床骨骼大小与发育好坏的影响。人类的上、下颌牙床骨骼、牙弓形态近似马蹄形,上面比下面大些。对于生长发育期的孩子,如果上面的牙床骨骼发育良
Observe the present children and adolescents, the upper and lower incisors arranged in irregularly high incidence. Not only the front teeth crowded, missing, and the lower incisors are also arranged “In and out ”. Figure 1 shows a case of lightly crowded lower incisors (a 2-millimeter congestion between teeth). From a clinical point of view, the lower incisors crowded and irregular, mostly crowded with the front teeth, “Tiger teeth ” dislocation or irregular alignment are closely related. Its causes, in addition to the genetic factors, but also directly by the maxillary dental bed bone size and developmental quality of the impact. Human upper and lower jaw bones skeletons, dental arch approximately horseshoe shape, above the larger than the following. For growth and development of children, if the above gums well developed