Davis P J
Community Dent Oral Epidemiol. 1987 Aug;15(4):218-20. doi: 10.1111/j.1600-0528.1987.tb00524.x.
This study was performed to determine the prevalence of hypodontia and hyperdontia of permanent teeth amongst Southern Chinese children in Hong Kong. The sample consisted of 1093 12-yr-old children on whom a panoramic radiograph was taken. The prevalence of congenitally missing teeth (third molars excluded) was 6.1% in boys, 7.7% in girls, and 6.9% for both sexes combined. On the average, each child was missing 1.5 teeth. The most commonly absent tooth was the mandibular incisor, affecting 58.7% of the children with hypodontia. Thirty children (2.7%) had supernumerary teeth, with a male:female ratio of 6.5:1; in four cases the tooth had erupted. Three children had fourth molars and one case of a supplemental premolar was recorded (all unerupted). Four cases of a maxillary supernumerary tooth and hypodontia in the mandible were seen.
本研究旨在确定中国香港地区南方儿童恒牙先天性缺牙和多生牙的患病率。样本包括1093名12岁儿童，均拍摄了全景X线片。先天性缺牙（不包括第三磨牙）的患病率在男孩中为6.1%，女孩中为7.7%，男女合计为6.9%。平均而言，每个儿童缺牙1.5颗。最常缺失的牙齿是下颌切牙，在先天性缺牙儿童中占58.7%。30名儿童（2.7%）有多生牙，男女比例为6.5:1；4例多生牙已萌出。3名儿童有第四磨牙，记录到1例额外前磨牙（均未萌出）。观察到4例上颌多生牙伴下颌先天性缺牙的情况。
