Dechkunakorn S, Chaiwat J, Sawaengkit P
Faculty of Dentistry, Mahidol University, Bangkok.
J Dent Assoc Thai. 1990 Jul-Aug;40(4):165-76.
Panoramic radiographs of 1,160 orthodontic patients, 655 females and 505 males, 6-15 years of age were selected for study in congenital absence, loss of permanent teeth and premature loss of deciduous teeth. The result from this investigation showed congenital absence for 100 subjects (8.6%, not including third molars) and 185 subjects (16%, third molars included). The permanent upper lateral incisors are most frequently missing (22.4%, third molars excluded), followed by upper second premolar, 17.8%, lower second premolar, 15.1%, and then lower lateral incisor, 12.5%. The study also showed loss of permanent teeth of 105 subjects (9.1%). The lower first molars are most frequently lost (52.8%), followed by the upper first molar (18.2%). There is no statistical significance (alpha = 0.01) between females and males in both congenital absence and loss of permanent teeth. The premature loss of deciduous teeth was found in 467 subjects (40.3%). The most frequently loss happened to second deciduous molars, followed by first deciduous molars and then deciduous canines. There is more statistical significance (alpha = 0.01) in females than in males.
选取了1160名6至15岁的正畸患者的全景X线片进行研究，其中女性655名，男性505名，研究内容为恒牙先天性缺失、恒牙缺失和乳牙早失情况。本次调查结果显示，100名受试者存在恒牙先天性缺失（8.6%，不包括第三磨牙），185名受试者存在恒牙先天性缺失（16%，包括第三磨牙）。上颌侧切牙最常缺失（排除第三磨牙后为22.4%），其次是上颌第二前磨牙，为17.8%，下颌第二前磨牙为15.1%，然后是下颌侧切牙，为12.5%。该研究还显示，105名受试者存在恒牙缺失（9.1%）。下颌第一磨牙最常缺失（52.8%），其次是上颌第一磨牙（18.2%）。在恒牙先天性缺失和恒牙缺失方面，女性和男性之间无统计学意义（α=0.01）。467名受试者出现乳牙早失（40.3%）。乳牙早失最常发生于第二乳磨牙，其次是第一乳磨牙，然后是乳尖牙。女性比男性具有更高的统计学意义（α=0.01）。
