著者

上田 美帆 髙岡 一樹 野阪 泰弘 吉竹 賢祐 岸本 裕充

出版者

公益社団法人 日本口腔インプラント学会

雑誌

日本口腔インプラント学会誌 (ISSN:09146695)

巻号頁・発行日

vol.30, no.1, pp.12-17, 2017-03-31 (Released:2017-04-20)

参考文献数

8

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The displacement of dental implants into the maxillary sinus is a common complication of maxillary implant surgery, and it is therefore important to investigate how such displacements occur and methods for removing the implants. We describe 11 cases in which dental implants were accidentally displaced into the maxillary sinus from 2005 to 2015. All cases were referred to our clinic from private dental clinics. Five males and 6 females, whose ages ranged from 32 to 81 years, participated in the study. The implants were parallel in design in eight cases, and tapered in design in three cases. In seven of the 11 cases, the implant had been placed in combination with a socket lift in the maxilla. Bone height at the displaced implant sites was 3.6±1.7 mm as measured by computed tomography. One dental implant was displaced into the maxillary sinus during implant placement. In three cases, the implants were displaced into the maxillary sinus in the post-first stage surgery period, and in four cases, during the second stage surgery. Two cases were sleeping implants. In one case, displacement occurred while the implant was being extracted because of peri-implantitis. Removal of implants from the maxillary sinus was achieved using three different approaches: access through the bone crestal defect in two cases, fenestration of the anterior wall of the maxillary sinus in seven cases, and endoscopic sinus surgery in one case. Fenestration of the anterior wall of the maxillary sinus is most commonly used because it is a simple technique that allows good surgical access. Endoscopic sinus surgery is the preferred choice for patients with chronic sinusitis. A crestal approach should only be used when a large defect is present on the alveolar ridge. Displaced dental implants in the maxillary sinus should be removed as soon as possible to avoid the development of maxillary sinusitis. Careful clinical and radiographic evaluation and appropriate treatment planning should take place before removal is undertaken.

著者

澤井 俊宏 新美 敦 山田 陽一 渡邊 和代 小関 健司 中井 英貴 本田 雅規 藤本 雄大 野阪 泰弘 上田 実

出版者

公益社団法人 日本口腔インプラント学会

雑誌

日本口腔インプラント学会誌 (ISSN:09146695)

巻号頁・発行日

vol.9, no.1, pp.97-102, 1996-03-31 (Released:2017-11-05)

参考文献数

10

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In the severely atrophic maxilla, prosthetic rehabilitation is difficult. However, rehabilitation using osseointegrated implants with bone grafting can resolve this problem. Among the various methods of bone graft to the maxilla, sinus lift is commonly used. This report presents two cases of oral rehabilitation using osseointegrated implants with the sinus lift. In case 1, grafted bone was harvested from the mental region of the mandible, and implantation was performed at the same time as the autogenous corticocancellous bone block graft. In case 2, grafted bone was harvested from the alveolar bone in the anterior region of the mandible, and implantation was performed secondarily after the autogenous particulate bone graft. Bone biopsy for histological analysis was performed in the above two cases. In both cases, new trabecular bone was observed in the augmented sinus floor. However, the trabeculae were more dense on the alveolar side than in the central area. In the case with splintered bone, empty bone lacunae were seen in the grafted region.