Al-Khateeb Susan, Al-Nimri Kazem, Alhaija Elham Abu
Department of Orthodontics, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan.
Dent Traumatol. 2005 Feb;21(1):26-8. doi: 10.1111/j.1600-9657.2004.00269.x.
The aims of this study were to investigate the incidence of coronal fracture of the anterior teeth in North Jordanian schoolchildren and to study the main predisposing factors and the factors that may affect the severity of this fracture. A study group (958) comprising schoolchildren aged 13-15 years was chosen by a simple random method from five geographical areas in Irbid Governate, Jordan. All children completed a questionnaire related to history of trauma to their anterior teeth before they had a clinical examination for lip competence, lip line and amount of fracture. Overjet was recorded from a study cast made for each student. Statistical analysis was performed using chi-square test. The results showed a prevalence of 11% of coronal fracture with female-male ratio of 1:1. An increase in the overjet more than 3 mm doubled the incidence of coronal fracture while overjet more than 6 mm increased the incidence fourfold. There was higher incidence of coronal fracture associated with lip incompetence and low lip line (P <0.01). The severity of fracture increased in children with a larger overjet (P <0.001). It was concluded that overjet, lip competence and lip line were important predisposing factors to coronal fracture of the anterior teeth while the severity of the fracture was mainly determined by overjet.
本研究的目的是调查约旦北部学童前牙冠折的发生率，并研究主要的诱发因素以及可能影响该骨折严重程度的因素。通过简单随机方法从约旦伊尔比德省五个地理区域选取了一个由13至15岁学童组成的研究组（958名）。所有儿童在接受唇功能、唇线和骨折程度的临床检查之前，都完成了一份与前牙创伤史相关的问卷。从为每个学生制作的研究模型上记录覆盖度。使用卡方检验进行统计分析。结果显示，冠折患病率为11%，男女比例为1:1。覆盖度增加超过3毫米会使冠折发生率加倍，而覆盖度超过6毫米会使发生率增加四倍。唇功能不全和低唇线与冠折发生率较高相关（P<0.01）。覆盖度较大的儿童骨折严重程度增加（P<0.001）。得出的结论是，覆盖度、唇功能和唇线是前牙冠折的重要诱发因素，而骨折的严重程度主要由覆盖度决定。
