天然歯と人工歯根の緩衝機構に関する生体力学的研究
スポンサーリンク
概要
- 論文の詳細を見る
The static as well as dynamic analyses of natural tooth and dental implants have been conducted using a finite element method and theoretical analysis method in an effort to develop the proper suppo ting system and shock-absorbing structure for dental implants. Followings are the results.<BR>I. Analysis of Natural Tooth<BR>1. When periodontal ligament was assumed to be an elastic continuum, the concentration of very large stress was observed at the apex under static load condition. When an impact was applied, the stress magnitude reached about 11 times the stress under static load condition.<BR>2. In the case of osteoankylosis, uniform diffusion of stress was observed under static load condition, but tooth mobility was poor. When an impact was given, the stress magnitude reached as high as 200 times the stress under static condition.<BR>3. When the transmission of force along the fibers of periodontal ligament is taken into consideration, both the degree of the displacement and the natural vibration frequency corresponded to the the clinically measured values; the stress concentration in the apex eased appreciably under static load condition, and when an impact was applied the stress fluctuation remained at a comparatively low as 10-fold increase.<BR>4. Theoretical analyses found that the viscosity level of periodontal ligament corresponds to the theoretical value where the highest shock-absorbing capability can be obtained. Due to this high viscosity, stress generated by the impact can be reduced to about 75 percent of the case when only elasticity is present.<BR>II. Analysis of Dental Implant<BR>1. Under static load condition, generally satisfactory results were obtained in stress diffusion by osteointegration. However, when implant material elasticity differs greatly from that of the bone, localized concentration of stress was measured at a protruding portion on the surface of implant.<BR>2. When an impact was given, due to osteointegration the stress which is about 200 times larger than the stress under static load condition was measured.<BR>3. In the dental implant having imbedded shock-absorbing structue, the displacement and vibration behaviors displayed by it were similar qualitatively and quantitatively to ones exhibited by natural tooth. The shock-absorbing capability also matched that of natural tooth.
- 社団法人 日本口腔外科学会の論文
著者
関連論文
- 実体模型操作と三次元画像表示の統合による顎矯正手術支援システム(サイバーワールド論文)
- 医師間のコミュニケーション支援を目的とした複合現実感顎手術計画システム(ロボットとコミュニケーション及び一般)
- 12-085 歯科における精神科リエゾン診療の現状 : 咬み合せリエゾン診療科(精神科1,一般演題(ポスター発表),近未来医療を担う心身医学,第1回日本心身医学5学会合同集会)
- 骨格性下顎前突・開咬症例に対し外科的に上顎咬合平面後方部を圧下した上下顎同時移動手術症例
- CT三次元実体モデルおよび歯列模型三次元分析システムの併用による下顎骨切り術のシミュレーション
- 摘出, 開窓によリ埋伏永久歯を萌出せしめた小児エナメル上皮腫の長期観察例
- 下顎に広範な歯肉壊死を伴った節外性NK/T細胞リンパ腫の1例
- 顎関節に重度の器質的変化を認めた強直性脊椎炎の1例
- 全顎抜歯を行った May-Hegglin anomaly の1例
- Study on multiphase biomedical materials compatible with bone tissue. Part 3. A cell culture test of hydroxyapatite-polymer composite material.:Part 3. A cell culture test of hydroxyapatite-polymer composite material
- Bilateral ossifying fibroma of the mandible: Report of a case.
- 天然歯と人工歯根の緩衝機構に関する生体力学的研究