Yasumura Toshihiko, Sueishi Kenji
Department of Orthodontics, Tokyo Dental College.
Bull Tokyo Dent Coll. 2016;57(4):281-290. doi: 10.2209/tdcpublication.2016-0800.
Posterior open bite can cause problems with occlusion. It arises from systemic or local factors such as physical or functional interference, ankylosis, and failure of eruption. Primary failure of eruption (PFE) is a rare condition that is difficult to differentiate from ankylosis and requires complex treatment strategies. Here we report a 12-year-old girl who was referred to our hospital by her dentist for re-evaluation of eruption failure of the left maxillary secondary premolar and first and second molars with congenitally missing maxillary lateral teeth. The maxillary first molar was extracted for a therapeutic diagnosis. The left maxillary secondary premolar and second molar reacted well to subsequent orthodontic treatment. Auto-transplantation of the mandibular premolar to the maxil-lary arch was carried out to achieve optimal overjet, overbite, and occlusion. The active treatment period spanned 4 years and 1 month. Assessment of the patient's medical and dental history, prior trauma, and clinical conditions resulted in a therapeutic diagnosis of PFE. Satisfactory orthodontic treatment results were achieved.
后牙开牙合会导致咬合问题。它由全身或局部因素引起，如物理或功能干扰、粘连以及萌出失败。原发性萌出失败（PFE）是一种罕见的病症，难以与粘连区分开来，需要复杂的治疗策略。在此，我们报告一名12岁女孩，她被牙医转诊至我院，以重新评估左上颌第二前磨牙、第一磨牙和第二磨牙萌出失败的情况，同时上颌侧切牙先天性缺失。为进行治疗性诊断，拔除了上颌第一磨牙。左上颌第二前磨牙和第二磨牙对随后的正畸治疗反应良好。将下颌前磨牙自体移植至上颌牙弓，以实现最佳的覆盖、覆牙合和咬合。积极治疗期长达4年零1个月。对患者的病史、既往创伤和临床状况进行评估后，得出PFE的治疗性诊断。正畸治疗取得了满意的效果。
