Miyamoto W, Chung C S, Yee P K
J Dent Res. 1976 Jul-Aug;55(4):584-90. doi: 10.1177/00220345760550040601.
The effect of the premature loss of deciduous canines and first and second molars on malocclusion of the permanent dentition was studied in 255 schoolchildren 11 years of age or older at the most recent examination of the permanent dentition. Malocclusion was evaluated by scoring malalignment (major and minor) and measurement of crowding in the anterior teeth. Children who had a premature loss of one or more canines or molars had a higher frequency of receiving orthodontic treatment of one type or another for the permanent dentition. The likelihood of need of treatment increased with the number of prematurely lost teeth. Children who had lost one or more deciduous teeth through age 9 had a greater than threefold increase in the frequency of orthodontic treatment relative to the control. Of those who did not receive orthodontic treatment, there was no detectable relationship of the premature loss of canines with the malalignment of permanent teeth. However, there was a significant effect of the premature extraction of molars on malalignment especially major malalignment of permanent teeth. No differences were noted in their effects between the first and second deciduous molars. Crowding of the anterior teeth was directly affected by the premature loss of deciduous canines.
在对255名11岁及以上的学龄儿童恒牙列进行的最近一次检查中，研究了乳牙以及第一和第二乳磨牙过早缺失对恒牙列错牙合的影响。通过对错位（主要和次要）进行评分以及测量前牙拥挤程度来评估错牙合情况。有一颗或多颗犬齿或磨牙过早缺失的儿童，恒牙列接受某种正畸治疗的频率更高。治疗需求的可能性随着过早缺失牙齿的数量增加而增加。9岁前就已缺失一颗或多颗乳牙的儿童，相对于对照组，正畸治疗频率增加了三倍多。在未接受正畸治疗的儿童中，犬齿过早缺失与恒牙排列不齐之间没有可检测到的关系。然而，乳磨牙过早拔除对恒牙排列不齐，尤其是恒牙的主要排列不齐有显著影响。第一和第二乳磨牙之间在其影响方面未观察到差异。乳牙犬齿过早缺失直接影响前牙拥挤情况。
