著者

泉 喜和子 下田 恒久 下田 哲也 香川 豊宏 池邉 哲郎 大関 悟

出版者

公益社団法人 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.56, no.4, pp.261-265, 2010-04-20 (Released:2013-10-19)

参考文献数

13

被引用文献数

2 2

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This report describes the feasibility of posterior-superior repositioning of the maxilla by Le Fort Ⅰ osteotomy with a pterygoid process fracture, while preserving the descending palatine artery. We examined movement accuracy and stability in 3 patients in whom maxillary protrusion with vertical maxillary excess was treated by moving the maxilla backward more than 4 mm. The postsurgical positions of the maxilla were more posterior than the presurgical expectations, but the differences were within 1 mm. Cephalometric analysis revealed that the differences in each measurement between immediately and one year after surgery were within 1 degree. Without mandibular osteotomy, maxillary protrusion can be satisfactorily treated with Le Fort Ⅰ osteotomy alone.

著者

住吉 周平 南部 敏之 本田 武司 下田 恒久 宮島 陽一 堤 定美

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.42, no.12, pp.1192-1199, 1996-12-20 (Released:2011-07-25)

参考文献数

21

被引用文献数

4 4

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Although mouthguards are used to protect the stomatognathic region in contact sports, their biomechanical efficacy has not been proved. The finite element method (FEM) is widely used in biomechanical studies involving static stress analyses. Studies of mouthguards especially require dynamic analyses. We performed an impact analysis of the maxillofacial region with the use of a pseudo 3 -D FEM model consisting of the head and neck in order to verify the efficacy of two mouthguard models against impact on the chin.The effects of impact on the maxillary central incisors and the neck of the condyle increased remarkably when the mouth was open. With the use of a mouthguard, the efficacy of impact absorption extended to the maxillary central incisors and the lateral margin of the aperture. A soft-type mouthguard was more effective than a hard-type one. With the use of a mouthguard, stress was concentrated at the neck of the condyle. The use of a mouthguard decreased stress to regions adjacent to the cerebrospinal area. These results suggest that mouthguards are effective in preventing brain concussion.