Shaweesh Ashraf I, Al-Omiri Mahmoud K, Alsoleihat Firas D
Department of Oral Medicine and Oral Surgery, Faculty of Dentistry, Jordan University of Science and Technology, PO Box 3030, Irbid 22110, Jordan.
Saudi Med J. 2011 Oct;32(10):1066-72.
To investigate the variation in time of permanent tooth emergence between urban and rural Jordanian school children.
In this observational cross-sectional study, 1900 pupils at urban schools, and 772 at rural schools aged 5-16 years in both genders were examined for emergence of permanent teeth at different urban and rural primary schools and kindergartens in Jordan between March and June 2010. Probit analysis was used to estimate the median age of emergence per permanent tooth.
The emergence ages for most of the permanent teeth were generally advanced in urban schoolboys in contrast to their fellows at rural schools. However, the differences were only statistically significant for the maxillary canine and maxillary premolars. Compared with boys, schoolgirls had smaller variation in permanent tooth emergence across school region, and none of the differences were statistically significant.
Urban schoolboys have accelerated emergence of the maxillary canine and maxillary premolars compared to rural boys. The potential etiology behind this finding needs to be investigated further in the future.
调查约旦城乡学童恒牙萌出时间的差异。
在这项观察性横断面研究中，于2010年3月至6月期间，对约旦不同城乡小学和幼儿园中1900名城市学校学生以及772名农村学校学生（年龄在5至16岁之间，男女皆有）进行恒牙萌出情况检查。采用概率单位分析来估计每颗恒牙萌出的中位年龄。
与农村学校的男学生相比，大多数恒牙的萌出年龄在城市男学生中普遍提前。然而，仅上颌尖牙和上颌前磨牙的差异具有统计学意义。与男生相比，女生在不同校区间恒牙萌出的差异较小，且所有差异均无统计学意义。
与农村男生相比，城市男生上颌尖牙和上颌前磨牙的萌出加快。这一发现背后的潜在病因未来需要进一步研究。
