Chung L K, Hobson R S, Nunn J H, Gordon P H, Carter N E
Department of Child Dental Health, Newcastle Dental School, Framlington Place, Newcastle upon Tyne NE2 4BW, UK.
J Orthod. 2000 Dec;27(4):315-8. doi: 10.1093/ortho/27.4.315.
The objective of this investigation was to examine the dentofacial features of a group of patients with hypodontia, in particular assessing whether cephalometric analysis confirmed the clinical assumption of a reduced lower face height, and to determine the relationship of these facial features with different numbers of missing teeth. It took the form of a cephalometric study, undertaken in a dedicated Dental Hospital clinic for patients with hypodontia. The study group comprised 59 patients seen on the Hypodontia Clinic: 32 females, 27 males, mean age 13.1+/-3.1 years (range 6-23 years). The average number of missing teeth was 7 (SD 5), ranging from 1 to 21. The mean SNA, SNB, and MMA angles were within normal limits, but there was a statistically significant reduction in the MMA when more than one tooth type was missing (P = 0.007) and the ANB angle decreased as the number of missing tooth types increased (P = 0.034). The mean values for the whole sample were within the normal range and did not demonstrate any feature specific to the group, but patients with more severe hypodontia showed tendencies to a Class III skeletal relationship and a reduced maxillary-mandibular planes angle.
本研究的目的是检查一组少牙症患者的牙颌面特征，特别是评估头影测量分析是否证实了临床关于面下高度降低的假设，并确定这些面部特征与不同缺牙数之间的关系。该研究采用头影测量研究的形式，在一家专门的牙科医院诊所对少牙症患者进行。研究组包括在少牙症诊所就诊的59名患者：32名女性，27名男性，平均年龄13.1±3.1岁（范围6 - 23岁）。平均缺牙数为7颗（标准差5），范围为1至21颗。平均SNA、SNB和MMA角在正常范围内，但当缺失一种以上牙型时，MMA有统计学显著降低（P = 0.007），且随着缺牙类型数量增加，ANB角减小（P = 0.034）。整个样本的平均值在正常范围内，未显示出该组特有的任何特征，但少牙症更严重的患者表现出III类骨骼关系和上颌 - 下颌平面角减小的趋势。
