Davis P J, Darvell B W
Department of Children's Dentistry and Orthodontics, University of Hong Kong, Prince Philip Dental Hospital.
Community Dent Oral Epidemiol. 1993 Jun;21(3):162-4. doi: 10.1111/j.1600-0528.1993.tb00743.x.
A radiographic survey of a random sample of 454 girls aged 5.9 +/- 0.5 yr and 521 boys aged 5.8 +/- 0.4 y was undertaken to establish data on the incidence of congenitally missing mandibular incisor teeth amongst the Southern Chinese and to compare these figures with those of a similar previous study of 12-yr-olds so to eliminate factors such a trauma or extractions which may have artificially inflated the 12-yr-old incidence data. The proportion of 5-yr-old girls and boys affected by hypodontia in the permanent mandibular incisor region was 0.086 and 0.046 respectively (a significant difference between sexes, P < 0.02), compared with 0.047 and 0.034 for the 12-yr-olds (a non-significant difference) so other factors must have contributed to the discrepancy between the two groups of children. A very strong correlation (P < 10(-25)) between missing primary and missing permanent mandibular incisors is present in this group, and this has implications for prognosis and treatment planning. A fundamental developmental defect is implied.
对454名年龄在5.9±0.5岁的女孩和521名年龄在5.8±0.4岁的男孩进行了随机抽样的X线检查，以获取中国南方人群中先天性下颌切牙缺失发生率的数据，并将这些数据与之前对12岁儿童进行的类似研究结果进行比较，从而排除可能人为抬高12岁儿童发生率数据的因素，如外伤或拔牙。在恒牙下颌切牙区域，5岁女孩和男孩受牙列缺损影响的比例分别为0.086和0.046（性别间差异显著，P<0.02），而12岁儿童的这一比例为0.047和0.034（差异不显著），因此其他因素必定导致了两组儿童之间的差异。在该群体中，乳牙缺失与恒牙下颌切牙缺失之间存在非常强的相关性（P<10⁻²⁵），这对预后和治疗计划具有重要意义。这意味着存在根本性的发育缺陷。
