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首页> 外文期刊>Acta Stomatologica Croatica >Prevalence and Characteristic Features of Mandibular Second Molar Impaction in Chinese-American School Children
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Prevalence and Characteristic Features of Mandibular Second Molar Impaction in Chinese-American School Children

机译：美籍华裔儿童下颌第二磨牙的患病率及特征

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Objectives: To determine the prevalence and characteristic features of mandibular permanent second molar impaction in a large sample of ethnic Chinese-American orthodontic patients. Materials and methods: Panoramic radiographs of 3000 consecutively orthodontically treated Chinese-American school children aged 11-15 years were studied for mandibular second molar impaction. Their anatomic position and angulation relative to the adjacent teeth were recorded and evaluated. Results: A total of 103 mandibular second molar impactions both unilateral and bilateral were detected in 71 Chinese-American patients with a prevalence of 2.36%. The significant majority of the mandibular second molar impactions (89%) were mesially inclined. Posterior mandibular crowding was detected in most of these impactions and the developing third molars were located along the root of the second molars, giving an impression of an overlap on the twodimensional panoramic radiographs. Conclusions: Chinese-American orthodontic patients present a prevalence rate of 2.36% in mandibular second molar impactions, most of them mesially inclined in posteriorly crowded arches and in close proximity of the developing third molars. A possible mechanism for their impaction is the predominant mesial angulation, possibly caused by the different stages of root development (distal root more developed than the mesial root). The posterior space deficiency appears to be less critical, thus a secondary factor. Early detection and an appropriate orthodontic treatment are recommended for best clinical outcome.
机译：目的：确定大量华裔美国正畸患者样本中下颌永久性第二磨牙的患病率和特征。材料和方法：研究了3000名连续正畸治疗的11-15岁华裔美国学童的下颌第二磨牙撞击的全景X线照片。记录并评估它们相对于相邻牙齿的解剖位置和成角度。结果：71例华裔美国人共检出单侧和双侧下颌第二磨牙103例，患病率为2.36％。下颌第二磨牙的大部分撞击（89％）为中斜。在大多数这些撞击中都检测到下颌后部拥挤，并且正在发展的第三磨牙位于第二磨牙的根部，给人的印象是二维全景X线照片上有重叠。结论：华裔美国正畸患者在下颌第二磨牙中的患病率为2.36％，其中大多数是在后方拥挤的弓形中并在发育中的第三磨牙附近。影响它们的可能机制是主要的中角膜成角，可能是由根部发育的不同阶段引起的（远中根比中部根更发达）。后部空间不足似乎不太重要，因此是次要因素。建议尽早发现并采取适当的正畸治疗以取得最佳临床效果。

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