Shahoon H, Esmaeili M
Assistant Professor, Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahed University of Medical Sciences, Tehran, Iran.
J Dent (Tehran). 2010 Winter;7(1):50-3. Epub 2010 Mar 31.
Intraosseous migration is an unusual developmental dental anomaly, which demonstrates horizontal movement of unerupted teeth only affecting the permanent dentition of the lower jaw. Mandibular second premolar is the most common impacted tooth after the third molars and maxillary canines. Distal migration of the second premolar is rare and early loss of the permanent first molar is one of the most important predisposing factors of intrabony migration of this tooth. Bilateral migration of the mandibular premolars is very rare compared to unilateral migration. Hereby, we present an 18-year-old man with bilateral intrabony migration of the mandibular second premolars to the mandibular angle (at the inferior and buccal side of the mandibular canal) in the presence of first molars. The patient also had nine congenitally missing teeth without any systemic complication or abnormality in the skeleton. The teeth were surgically extracted. The clinical and diagnostic features and treatment of this case are discussed.
骨内迁移是一种罕见的牙齿发育异常，表现为未萌出牙齿的水平移动，仅影响下颌恒牙列。下颌第二前磨牙是继第三磨牙和上颌尖牙之后最常受影响的牙齿。第二前磨牙向远中迁移很少见，恒牙第一磨牙过早缺失是该牙骨内迁移最重要的诱发因素之一。与单侧迁移相比，下颌前磨牙双侧迁移非常罕见。在此，我们报告一名18岁男性，其下颌第二前磨牙双侧骨内迁移至下颌角（在下颌管的下方和颊侧），且存在第一磨牙。该患者还伴有9颗先天性缺失牙，无任何全身并发症或骨骼异常。牙齿通过手术拔除。本文讨论了该病例的临床、诊断特征及治疗情况。
