为研究克罗地亚小儿第三磨牙的发育,对2350例小儿的颌骨全景X线照片进行分析,年龄7、8、9、10、11、12岁各300例,14～18岁550例,男、女各占半数。 结果表明,下颌第三磨牙发育比上颌早,7岁组:15％的男孩和16％的女孩可见下颌第三磨牙,只有4.7％的女孩和8.7％的男孩可见上颌第三磨牙,有显著性差异(P<0.01)。第三磨牙的发育在性别上有差别,9岁组:40％的女孩有第三磨牙,男孩只32.5％(P To study the development of pediatric third molars in Croatia, panoramic X-ray images of the mandible in 2350 pediatric patients were analyzed. The X-ray images of jaws in 300 children aged 7, 8, 9, 10, 11 and 12 years and 550 in 14 to 18 years old, Women each account for half. The results showed that the mandibular third molar developed earlier than the maxillary. In the 7-year-old group, the third molars of the mandible were visible in 15% of the boys and 16% of the girls. Only 4.7% of the girls and 8.7% of the boys showed the maxillary third molars. Difference (P <0.01). The development of the third molars was sexually different. In the 9-year-old group, 40% of the girls had third molars and the boys only 32.5% (P