Dashash Mayssoon, Al-Jazar Noor
Department of Pediatric Dentistry, Faculty of Dentistry, Damascus University, Damascus, Syria.
Department of Prosthodontics, Faculty of Dentistry, Damascus University, Damascus, Syria.
J Investig Clin Dent. 2018 May;9(2):e12311. doi: 10.1111/jicd.12311. Epub 2017 Dec 6.
The aim of the present study was to investigate the timing and sequence of the eruption of permanent teeth in Syrian schoolchildren.
A total of 1211 children aged 5-13 years were included. Every permanent tooth was scored according to its clinical stage of eruption. The significance of difference was tested using t test.
The mean number of erupted teeth in children aged 5-6 years was 2.41 ± 2.68, and reached to 24.48 ± 3.60 in those ages between 12 and 13 years. Mandibular teeth erupted earlier than maxillary opposing teeth in both sexes, except upper premolars. The eruption significantly proceeded in girls when compared to boys. Differences were significant for numbers 11 (P = .003), 21 (P = .035), 13 (P = .013), 42 (P = .038), 33 (P = .009), and 45 (P = .012). There was no significant difference between contralateral teeth (right and left) in the mean age of eruption in both arches. Lower central incisors and first molars were the earliest teeth to emerge in both sexes. Second molars were the last teeth to emerge in boys (maxilla: 11.68 years, mandible: 11.15 years) and girls (maxilla: 11.2 years, mandible 10.99 years).
Findings could be used as Syrian standards of eruption when health professionals assess normal occlusion and need to determine the correct timing for preventive or corrective procedures.
本研究旨在调查叙利亚学龄儿童恒牙萌出的时间和顺序。
共纳入1211名5至13岁的儿童。根据恒牙的临床萌出阶段对每颗恒牙进行评分。采用t检验检验差异的显著性。
5至6岁儿童的平均萌出牙数为2.41±2.68颗，在12至13岁儿童中达到24.48±3.60颗。除上颌前磨牙外，下颌牙在两性中均比上颌对应牙萌出早。与男孩相比，女孩的萌出进程明显更快。第11、21、13、42、33和45颗牙的差异具有显著性（P分别为0.003、0.035、0.013、0.038、0.009和0.012）。在两个牙弓中，对侧牙（右侧和左侧）的平均萌出年龄没有显著差异。下颌中切牙和第一磨牙是两性中最早萌出的牙齿。第二磨牙是男孩（上颌：11.68岁，下颌：11.15岁）和女孩（上颌：11.2岁，下颌：10.99岁）中最后萌出的牙齿。
当健康专业人员评估正常咬合并需要确定预防或矫正程序的正确时机时，本研究结果可作为叙利亚恒牙萌出的标准。
