Okuyama Kohei, Sakamoto Yuki, Naruse Tomofumi, Kawakita Akiko, Yanamoto Souichi, Furukawa Kohei, Umeda Masahiro
a Department of Clinical Oral Oncology , Nagasaki University Graduate School of Biomedical Sciences, Nagasaki University , Nagasaki , Japan.
Cranio. 2017 Sep;35(5):327-331. doi: 10.1080/08869634.2016.1240466. Epub 2016 Oct 3.
To present a case report on the presence of an ectopic mandibular third molar (EMTM), the surgical treatment, and outcome.
A 63-year-old woman presented with right preauricular facial swelling, limited jaw function, and pain. Radiographic assessment demonstrated an EMTM positioned in the superoposterior aspect of the ramus. Radiographically, there was a bony tunnel extending from the third molar to distal of the second molar. The patient was treated by an intraoral approach on the medial aspect of the ramus for removal of the ectopic third molar, as well as the tissue in the bony tunnel.
The patient healed uneventfully. The soft tissue in the bony canal was granulation tissue, and nerve function was preserved. A literature search of EMTMs was conducted identifying 17 reported cases.
Three-dimensional imaging in the management of EMTM can be beneficial in identifying position of the tooth, associated pathology, and identifying the position of neurovascular structures to aid in removal of the ectopic tooth.
报告一例异位下颌第三磨牙（EMTM）的病例、手术治疗过程及结果。
一名63岁女性患者出现右耳前面部肿胀、下颌功能受限及疼痛。影像学评估显示一颗EMTM位于下颌支的后上方。影像学检查发现有一条骨隧道从第三磨牙延伸至第二磨牙远中。患者接受了经下颌支内侧的口内入路手术，以切除异位第三磨牙及骨隧道内的组织。
患者顺利康复。骨管内的软组织为肉芽组织，神经功能得以保留。对EMTM进行文献检索，共识别出17例报告病例。
在EMTM的治疗中，三维成像有助于确定牙齿位置、相关病变以及神经血管结构的位置，以协助拔除异位牙。
