西安市3488例学龄前儿童乳牙融合牙调查

目的：调查西安地区乳牙融合牙的发生率、分布特点及牙列变化情况。方法：采用流行病学调查方法,对西安市15所幼儿园的3488名3～6岁儿童进行口腔检查,对融合牙患儿进行曲面断层片检查和模型分析。结果：3488名儿童中乳牙融合牙发生率为1．95％,男女性别之间无统计学差异;主要发生于下颌前牙区,占91．18％,单侧型居多,占91．18％。在68例融合牙患儿中,有6例为双侧融合,且对称分布,比例为8．82％。乳牙列间隙中灵长间隙发生率最高,约为47．06％,其次为混合间隙44．12％。末端平面类型中双侧型占69．12％,混合型占30．88％。下颌单侧融合牙者,上颌牙齿总宽度没有明显变化;下颌总宽度较正常牙列牙齿总宽度小约2 mm。结论：乳牙融合牙有一定的发生率,且对牙列间隙、牙齿宽度、和牙弓宽径发育造成一定的影响,儿童口腔专业医生应予重视,定期观察,预防各种错牙合畸形的发生。

An epidemiological investigation on fusion of deciduous teeth of 3488 preschool children in Xi'an

[Abstrat] Objective:To investigate the occurrence, distribution and primate dentition of the fusion of deciduous teeth in xi'an. Method:By using epidemiological investigation in 15 kindergartens, 3488 children aged 3~6 years were checked and fused teeth were in X examination and model analysis. Result:Of 3488 children investigated, fusion of decid-uous teeth were in 68 children(1.95 percent) without sex divergence. The fused teeth mainly located in mandibular anterior teeth area(91.18 percent),frequently unilaterally(91.18 percent). 6 of 68 cases were symmetrical distribution(8.82 per-cent). The primate space is highest in fusion of deciduous dentition, about 47.06 %, followed by mixed space, about 44.12 %. Double side of terminal plane accounted for 69.12 %, mixed 30.88 %.In the unilateral mandibular fused teeth, the width of maxillary teeth did not change significantly; but the average width of mandibular teeth reduced 2 mm. Con-clusion:The occurrence of the fused teeth may cause some complications, also influence the space of deciduous dentition, the width of primate teeth and the width of primate dentition. Pediatric dentists should pay attention to the fused teeth oc-curred in preschool children.