Mortazavi Hamed, Baharvand Maryam, Rezaeifar Kosar
Department of Oral Diseases, School of Dentistry, Shahid Beheshti University, Teheran, Iran.
Dent Med Probl. 2018 Jan-Mar;55(1):87-90. doi: 10.17219/dmp/80829.
Migration is a kind of eruption abnormality where a tooth grows far from its original site of development. Anomalies in dental eruptions are referred to as ectopia, which might be encountered in several regions around the oral cavity. The incidence of mandibular second premolar impaction has been estimated to be 2.1-2.7%. The frequency of its intraosseous distal migration is 0.25%. We report a case of extremely distally intraosseous migration of mandibular second premolar, which was found in a routine radiography. A 28-year-old woman who attended a dental clinic to treat teeth caries was noticed to have her lower second premolar located horizontally in the homolateral mandibular angle below the inferior alveolar nerve canal on a panoramic view. As the patient was asymptomatic, she was advised to take follow-up radiographs to rule out any cystic/neoplastic changes. Taking a panoramic radiograph in patients with missing mandibular premolars should be considered, because in rare cases migration or transmigration of these teeth may happen.
牙齿异位萌出是一种萌出异常情况，即牙齿在远离其原始发育位置萌出。牙齿萌出异常被称为异位萌出，可能出现在口腔周围的多个区域。据估计，下颌第二前磨牙阻生的发生率为2.1% - 2.7%。其在骨内远中移位的频率为0.25%。我们报告一例下颌第二前磨牙在骨内极度远中移位的病例，该病例是在常规影像学检查中发现的。一名28岁女性因治疗龋齿前往牙科诊所，全景片显示其下颌第二前磨牙水平位于同侧下颌角，在下牙槽神经管下方。由于患者无症状，建议其进行随访影像学检查以排除任何囊性/肿瘤性改变。对于下颌前磨牙缺失的患者，应考虑拍摄全景片，因为在罕见情况下这些牙齿可能会发生移位或穿通移位。
