著者

大町 浩史 原田 清 佐藤 昌 盛島 聖子 樺沢 勇司 丸岡 豊 小村 健

出版者

特定非営利活動法人 日本顎変形症学会

雑誌

日本顎変形症学会雑誌 (ISSN:09167048)

巻号頁・発行日

vol.16, no.1, pp.8-11, 2006-04-15 (Released:2011-02-09)

参考文献数

10

---

Soft tissue changes in the chin were compared between patients undergoing sagittal split ramus osteotomy (SSRO) for mandibular setback with and without reduction genioplasty. Twenty patients with symmetrical skeletal Class III malocclusion were examined. Twelve underwent SSRO alone (group I), and 8 underwent SSRO combined with reduction genioplasty (group II). Reduction genioplasty was performed by two horizontal osteotomies, removing the bony wedge, and posterosuperior movement of the inferior segment of the chin. Lateral cephalograms were obtained preoperatively and 6 months postoperatively. Pre- to postoperative changes in the positions of hard-tissue points (B-point [B], pogonion [Ng], and menton [Me]) and soft-tissue B-point [sB], soft-tissue pogonion [sPog], and menton [sMe] were measured on the cephalograms. The ratio of the soft tis-sue movement to the hard tissue movement was also calculated. Though superior movement of Me was significantly larger in group II than in group I, there were no significant differences in the superior movement ratios of sMe to Me between the two groups. However, the posterior movement ratio of sPog to Pog was significantly larger in group I than in group H. These results suggest that the reduction genioplasty performed by two horizontal osteotomies, removing the bony wedge, and posterosuperior movement of the inferior segment of the chin had little effect on the posterior movement of the chin. Therefore, in patients with skeletal class III malocclusion, reduction genioplasty should be applied mainly to vertical shortening of the chin.

著者

武元 徹 樺沢 勇司 津島 文彦 平井 秀明 小村 健 原田 浩之

出版者

社団法人 日本口腔外科学会

雑誌

日本口腔外科学会雑誌 (ISSN:00215163)

巻号頁・発行日

vol.62, no.9, pp.454-459, 2016-09-20 (Released:2016-12-13)

参考文献数

22

被引用文献数

1

---

We report a case of chronic expanding hematoma (CEH) in the temporomandibular joint (TMJ) region. A 48-year-old man visited our department because of a mass in the left preauricular region and trismus in November 2012. He had noticed the mass about 2 months previously, which gradually expanded. At initial presentation, examination revealed a hard elastic mass, measuring 22 mm in diameter, in the left preauricular region. The maximum mouth opening was 33 mm. Computed tomography showed a well-demarcated mass lateral to the mandibular condyle, accompanied by condylar bone resorption. On magnetic resonance imaging, the mass showed heterogeneous high signal intensity on T1-weighted images and heterogeneous low signal intensity on T2-weighted images. The mass showed mild uptake on 2-deoxy-2- [18F] fluoro-D-glucose positron emission tomography. Fine needle aspiration yielded a diagnosis of class I. The clinical diagnosis was a suspected tumor in the left TMJ region. The lesion was extirpated with the patient under general anesthesia in December 2012 and was histopathologically diagnosed as hematoma. On the basis of the clinical course and histopathological findings, the lesion was finally diagnosed as CEH. As of about 3 years after surgery, the postoperative course has been uneventful, with no evidence of recurrence.