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Dive into the research topics where Hideo Kanitani is active.

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Featured researches published by Hideo Kanitani.


Journal of Biomedical Materials Research | 1997

Three‐dimensional examination of bone structure around hydroxyapatite implants using digital image processing

Rudi Wigianto; Tetsuo Ichikawa; Hideo Kanitani; Masanobu Horiuchi; Naoyuki Matsumoto; Hiroshi Ishizuka

This study introduced a new method for three-dimensional (3D) examination of the bone structure around an implant and presented 3D bone-implant contact rates. A block of nondecalcified implant tissue was ground gradually at an interval of 80 micrograms for the collection of serial two-dimensional (2D) images. An image of the stained block surface was instantly recorded by a charge-couple device (CCD) camera and computer-aided system. A 3D model was reconstructed from 60-70 sheets of serial 2D images. The 3D bone structure around the implant was shown in perspective and displayed all sides of the implant. The bone-implant contact rate depended on the cutting position and direction in the specimen. The 3D model will be necessary and valuable for the biomechanical study of dynamic bone changes around implants.


Journal of Oral Implantology | 2000

Bone Changes Around Hydroxyapatite and Titanium Implants After Abutment Placement in Rabbits—Observations Using Histological and Three-dimensional Examinations

Hideo Kanitani; Yoritoki Tomotake; Naeko Kawamoto; Tetsuo Ichikawa; Rudi Wigianto

We have previously developed a computer-aided system for examination of the three-dimensional bone structure around implants and observed the bone changes in the healing period after implant placement. This paper describes the bone changes around hydroxyapatite (HA) and titanium (Ti) implants after abutment placement using histological and three-dimensional examinations. Twenty-four HA and Ti implants were embedded in the tibias of adult male New Zealand white rabbits. After 8 weeks, the abutment had passed through periosteum and was placed under the skin. Rabbits were sacrificed 4 and 8 weeks following abutment placement. In conclusion, histological examination showed that, at 4 weeks after abutment placement, bone resorption around the implant neck was seen in both HA and Ti implants, and at 8 weeks, excessive bone formation was seen around the implant neck. Three-dimensional bone examination showed that abutment placement may affect bone formation and cause additional bone hypertrophy in the bone marrow area.


Nihon Hotetsu Shika Gakkai Zasshi | 2003

Evaluation of Fit in Implant-supported Prostheses Using Measurement of Rotational Angle/Tightening Torque in Screwing

Akihiko Saika; Tetsuo Ichikawa; Yoritoki Tomotake; Hideo Kanitani; Seiko Hongama

目的: インプラント上部構造には精度の高い適合性が要求されるため, さまざまな適合性の評価法が提唱されている. 著者らは, 上部構造連結部のスクリュー締め付け回転角/トルク計測装置を考案し, この装置を用いて, スクリュー固定式インプラント上部構造の適合性を作業模型上で評価した.方法: スクリュー固定術者可撤式上部構造を装着し, 術後良好に経過している患者14名, 計24上部構造 (単独植立3, 部分欠損20, フルブリッジ1) のスクリュー連結部について, 作業模型上で締め付け回転角/トルク値を計測し, 適合性を評価した. また, 締め付け順序の違い, ユニット数の違いによる影響について評価した.結果: すべてのスクリュー連結部の, 締め付け回転角/トルク値の平均は約2.6° (SD: 0.6°)/Ncmで, コントロールとしてアバットメントにスクリューのみを締め付けたものより有意に大きかった. 締め付け順序, ユニット数の違いによる締め付け回転角/トルク値の有意差は認められなかった.結論: スクリュー締め付け回転角/トルク値は, 上部構造の適合性評価に用いることが可能であると考えられた. 今回計測した上部構造の適合性は, acceptable fit内できわめて高かったことが示唆された.


Nihon Hotetsu Shika Gakkai Zasshi | 2002

Evaluation of Osseointegration with an Impulse Response and Bone Marrow Pressure.

Yoritoki Tomotake; Hideo Kanitani; Masahide Nakao; Tetsuo Ichikawa

目的: チタンとハイドロキシアパタイト (以後, Ti, HAと略す) の異なる表面性状をもつインプラントについて伝導特性の相違を比較し, オッセオインテグレーションの評価を推定することを目的とした.方法: ウサギ脛骨に2種類の表面性状のインプラントを埋入した. 10週後に, インパルス打診試験を行い, インパルスハンマーと骨髄内に固定した小型圧力センサーにより, その振動特性と骨髄圧を測定し, インプラント材質間の差異を比較した. また, 組織学的にインプラント周囲骨の状態を検索し, 圧伝導特性との関係を検討した.結果: 観測されたインパルス継続時間では, HAで163±23μsec, Tiで165±20μsecと有意な差はなかった. 一方, 最大骨髄圧値は, HAで90.3±30.6mmHg, Tiで117.4±54.8mmHgと有意にTiのほうが大きく, また, 偏差もHAに比べTiのほうが大きかった. インパルス継続時間と最大骨髄圧値の間にはTiで負の相関関係が認められたが, HAでは相関が認められなかった. インプラント周囲骨の組織学的検索においては, インプラント間での差異は確認できなかった.結論: 骨髄圧値の測定から, TiとHAにおける圧伝導性の相違が認められた. 両者の周囲骨の組織像に差は認められず, インプラントの材質による影響が大きいことが示唆された. 評価法を構築していくうえで, 材質の特性の差異を考慮する必要性が示唆された.


Clinical Oral Implants Research | 1997

Influence of bone quality on the stress distribution.: An in vitro experiment

Tetsuo Ichikawa; Hideo Kanitani; Rudi Wigianto; Naeko Kawamoto; Naoyuki Matsumoto


Journal of Oral Implantology | 1996

Rapid bone resorption adjacent to hydroxyapatite-coated implants.

Tetsuo Ichikawa; Katsuhiko Hirota; Hideo Kanitani; Rudi Wigianto; Naeko Kawamoto; Naoyuki Matsumoto; Yoichiro Miyake


Clinical Oral Implants Research | 1999

Three-dimensional bone structure around hydroxyapatite and titanium implants in rabbits

Rudi Wigianto; Tetsuo Ichikawa; Hideo Kanitani; Naeko Kawamoto; Naoyuki Matsumoto; Hiroshi Ishizuka


Nihon Hotetsu Shika Gakkai Zasshi | 1998

Influence of Implant Connection on Mandibular Flexure in Jaw Movement: Three-dimensional Finite Element Analysis.

Miyuki Noda; Masatoshi Ishikawa; Tetsuo Ichikawa; Hideo Kanitani; Yoritoki Tomotake; Naeko Kawamoto; Kan Nagao; Fumiaki Kawano; Masaru Hada


Nihon Hotetsu Shika Gakkai Zasshi | 1996

Efficacies of Acidic and Neutral Electrolyzed Water as a Denture Cleanser. Bacteriological Study.

Naeko Kawamoto; Tetsuo Ichikawa; Hideo Kanitani; Toshiya Kashiwabara; Masanobu Horiuchi; Katsuhiko Hirota; Yoichiro Miyake; Naoyuki Matsumoto


Nihon Hotetsu Shika Gakkai Zasshi | 1996

Oral Condition and Microflora of Denture Plaque of Geriatric Inpatients. Part 1. Preliminary Survey.

Toshiya Kashiwabara; Tetsuo Ichikawa; Naeko Kawamoto; Hideo Kanitani; Masanobu Horiuchi; Katsuhiko Hirota; Yoichiro Miyake; Naoyuki Matsumoto

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