著者

澤 裕一郎 渡邉 悟朗 原 禎幸 丸山 誠二 桜田 聡彦 溝越 俊二

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.15, no.1, pp.59-65, 2002-03-31 (Released:2015-08-20)

参考文献数

9

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PRP (platelet rich plasma) has a beneficial effect on wound healing due to growth factors.When the bone graft was performed combination to PRP, the outcomes brought about a favorable condition in the graft area soon after operation. Early reports about PRP, the preparation of PRP dissociated from 400~500 whole blood as autologous blood. The procedure was complex and must return to transfusion of remaining blood after surgery. Recently, the importance of PRP is recognizing in bone graft and the opportunity to use PRP is increasing. Therefore, it is required to obtain a little quantity of PRP more easily. Thus, a method of a little PRP preparation was examined, and the optimal centrifugation method was selected.In this time, twice centrifuging separated 1 ml PRP from 8 ml whole blood was used for 20 volunteers, and the centrifugation method was prepared for four centrifugation groups. As for the results, the group which contained the highest concentration of platelets was 2,400 rpm 7minutes/3,000rpm-10minutes(1st/2nd). The mean of platelet level was 119.3(±29.7)×104/μl and magnification was 4.9 in the group. It was found that the 1 ml PRP which separated from 8 ml whole blood contained either equivalent or more platelets compared with another techniques. Therefore, it was suspected that the 1 ml PRP also has a beneficial effect on wound and bone healing.

著者

澤 裕一郎 川野 大 福井 克仁 中山 敦史 土井田 誠 宮城島 俊雄

出版者

Japanese Society of Oral and Maxillofacial Surgeons

雑誌

日本口腔外科学会雑誌 (ISSN:00215163)

巻号頁・発行日

vol.46, no.6, pp.372-374, 2000-06-20

被引用文献数

10 1

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Bone grafts are useful for the placement of implants in atrophic bone in edentulous regions. Usually, grafted bone undergoes resorption and provides inadequate support for implants. The guided bone regeneration (GBR) method can prevent resorption of grafted bone; however, GBR has some disadvantages, including exposure of the membrane and infection. Platelet rich plasma (PRP) accelerates wound healing by autologous growth factors. We consider growth factors of PRP to promote sufficient bone for implants. In this study, we used PRP gel to graft, bone harvested from the chin to the anterior maxillary region, which had undergone resorption. After 14 weeks, we decided that there was sufficient bone in the region on computed tomographic examination. After 16 weeks, implants were able to be placed, despite bone resorption. Biopsy of bone specimens revealed active osteogenesis and bone remodeling. Our results suggest that PRP could accelerate bone healing and remodeling, but could not prevent bone resorption in a similar manner to GBR. We confirmed that PRP gel is beneficial at the time of bone grafting for implants.

著者

中村 克己 南澤 裕一郎 豊田 啓孝 古賀 隆治 和田 修己 斎藤 義行 中村 篤

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会論文誌. C, エレクトロニクス (ISSN:13452827)

巻号頁・発行日

vol.89, no.11, pp.833-842, 2006-11-01

被引用文献数

22

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筆者らは,LSIの電源系高周波電流による電磁妨害波(EMI, Electromagnetic Interference)のシミュレーションを目的としたEMCマクロモデルとしてLECCS-coreモデルを提案している.本論文では複数種の電源端子を有し,かつ,異なる電源種の回路間が電気的に結合しているLSIに対し,LECCS-coreモデルの構築方法を検討した.実際に3種類の電源端子を有するマイクロコントローラH8/3694Fを用いて, Sパラメータ測定と等価回路変換から等価内部インピーダンスを抽出した.次に,測定した等価内部インピーダンスと電源端子電流より,位相情報をもつ内部電流源を電源種ごとに導出した.作成したモデルの検証として,バイパスコンデンサによるデカップリング効果をシミュレーションし,実測と比較した.その結果,約300MHzまでの電源系高周波電流を精度よくシミュレーションできることを示した.

著者

澤 裕一郎 熊澤 友子 滝本 明 馬杉 亮彦 川野 大 野村 明日香

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.50, no.6, pp.408-411, 2004-06-20 (Released:2011-04-22)

参考文献数

12

被引用文献数

1

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Paralysis of the mental nerve is one of the principal complications of surgery of the mandibular canal and mental foramen region. The position of mental foramen can be clearly depicted on CT scans. The mental foramen is bilaterally located at the mandibular premolar region and appears as a dimple on the bone surface. However, several reports have described an accessory mental foramen (AMF). We examined CT pictures taken from patients with implants for missing mandibular teeth to detect variations of the AMF. The results were follows: 1) AMFs were present in 28 patients (24.6 %). 2) Unilateral AMFs were found in 24 patients, and bilateral AMFs in 4 patients. 3) Among patients with unilateral AMFs, 21 had AMFs with one foramen, and 3 had AMFs with two foramens. Among patients with bilateral AMFs, 2 patients had one foramen on each side, and 2 had two foramens on one side. 4) The position of AMF relative to that of the mental foramen was as follows: 18 foramens were superior mesial, 8 were superior distal, 6 were inferior mesial, and 5 were inferior distal.These results suggest that one quarter of patients with missing mandibular teeth may have AMFs around the mental foramen.

著者

澤 裕一郎 熊澤 友子 滝本 明 馬杉 亮彦 川野 大 野村 明日香

出版者

Japanese Society of Oral and Maxillofacial Surgeons

雑誌

日本口腔外科学会雑誌 (ISSN:00215163)

巻号頁・発行日

vol.50, no.6, pp.408-411, 2004-06-20

被引用文献数

1

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Paralysis of the mental nerve is one of the principal complications of surgery of the mandibular canal and mental foramen region. The position of mental foramen can be clearly depicted on CT scans. The mental foramen is bilaterally located at the mandibular premolar region and appears as a dimple on the bone surface. However, several reports have described an accessory mental foramen (AMF). We examined CT pictures taken from patients with implants for missing mandibular teeth to detect variations of the AMF. The results were follows: 1) AMFs were present in 28 patients (24.6 %). 2) Unilateral AMFs were found in 24 patients, and bilateral AMFs in 4 patients. 3) Among patients with unilateral AMFs, 21 had AMFs with one foramen, and 3 had AMFs with two foramens. Among patients with bilateral AMFs, 2 patients had one foramen on each side, and 2 had two foramens on one side. 4) The position of AMF relative to that of the mental foramen was as follows: 18 foramens were superior mesial, 8 were superior distal, 6 were inferior mesial, and 5 were inferior distal.<BR>These results suggest that one quarter of patients with missing mandibular teeth may have AMFs around the mental foramen.