混合牙列期下前牙拥挤与牙弓、基骨弓相关性研究

Relationship between Mandibular Anterior Crowding and Dental Arch and Base Bone in the Mixed Dentition

目的:对混合牙列期下前牙拥挤患者与正常[牙合]牙弓、基骨弓形态对比研究,分析拥挤度与牙弓、基骨弓形态相关性,以期对临床及科研工作提供参考。方法:选取139例下颌模型,按拥挤度分为拥挤组(n=71)和正常组(n=68),测量牙弓周长、牙弓、基骨弓长度和宽度,比较两组各项指标的差异,分析拥挤度与牙弓、基骨弓形态相关性。结果:(1)正常[牙合]组各指标男性显著大于女性;(2)拥挤组除牙弓与基骨弓后段长度外,其余指标均较正常组小;牙弓周长,牙弓前段长度,牙弓前、中段宽度,基骨弓前段长度,男性组基骨弓中、后段宽度差异显著;(3)男女组拥挤度与牙弓、基骨弓前段长度,女性组拥挤度与基骨弓中段宽度呈负性相关。结论:牙列拥挤与牙弓、基骨弓形态密切相关。

Objective:To compare and analyze the relationship between mandibular anterior crowding in the mixed dentition and the dental arch and the base bone.Methods:Mandibular dental casts of 139 children in the early mixed dentition were divided into two groups according to the severity of mandibular anterior crowding.The total arch length,dental arch length and width,and basal bone arch length and width were compared between the crowded group(71)and noncrowded group(68),and the correlations with crowding were investigated.Results:Males in the normal group were significantly larger than females.In the crowded group,except for the length of the arch and the posterior segment of the basal bone arch,the other indicators were smaller than the normal group;the total arch length,the first dental arch length,the first and second dental arch width,the first basal bone arch length,and the second and third basal bone arch width in males group were significantly larger in normal group.Significant inverse correlations were found between crowding and the length of first dental arch and first basal bone arch.It also had significant inverse correlations between crowding and the width of second basal bone arch in female group.Conclusion:The crowded dentition has a close relationship with the dental arch and basal bone arch.