Kuba Y, Taniguchi K, Kuboyama H, Motokawa W, Braham R L
Department of Pediatric Dentistry, Fukuoka Dental College, Japan.
J Clin Pediatr Dent. 1995 Spring;19(3):205-9.
This report documents two patients with inversion and impaction of the second premolar tooth. Family and personal histories of both patients were unremarkable with no abnormalities in general growth and development nor any history of trauma. Patient 1 was a 10-year-old female with inversion and impaction of the mandibular right second premolar. Fifteen months previously, pre-operative radiographic examination prior to extraction of the mandibular right second primary molar revealed a normal direction and eruptive pattern of the tooth in question. However, following extraction of the mandibular right second primary molar, the developing succedaneous premolar was seen to be inverted. This was suggestive of inversion resulting from an iatrogenic force during tooth extraction. The second patient was a 9-year-old male with inversion and impaction of the maxillary right second premolar. Radiographic examination 3 months prior to the initial visit at our hospital showed an existing inversion of this tooth. This pointed to a developmental abnormality in the location of the original tooth bud.
本报告记录了2例第二前磨牙倒置并阻生的患者。2例患者的家族史和个人史均无异常，一般生长发育无异常，也无任何外伤史。患者1为10岁女性，下颌右第二前磨牙倒置并阻生。15个月前，在下颌右第二乳磨牙拔除术前的影像学检查显示，该恒牙的方向和萌出模式正常。然而，拔除下颌右第二乳磨牙后，可见发育中的继承前磨牙倒置。这提示是拔牙过程中的医源性力量导致了倒置。第二例患者是一名9岁男性，上颌右第二前磨牙倒置并阻生。在我院初诊前3个月的影像学检查显示该牙已有倒置。这表明原牙胚位置存在发育异常。
