English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 45069/58245 (77%)
造訪人次 : 2345989      線上人數 : 396
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: http://libir.tmu.edu.tw/handle/987654321/4738


    題名: 人工牙根植體受重覆性疲勞負荷之破壞斷面分析
    Fracture Surface Analysis of Dental Implant after Repeated Loading Fatigue Failure
    作者: 張正忠
    Cheng-Chung, Chang
    貢獻者: 口腔復健醫學研究所
    關鍵詞: 人工牙根
    植體
    疲勞
    生物力學
    斷面分析
    dental implant
    fatigue
    biomechanics
    surface analysis
    日期: 2002
    上傳時間: 2009-09-10 16:15:09 (UTC+8)
    摘要: 雖然人工植牙的成功率很高,但植體失敗的機會仍時有所聞,而其中最常見的原因,則是植體的疲勞性斷裂以及螺釘鬆脫。儘管各家製造廠商在其植體系統中紛紛設計各種增強組件,但仍無法有效避免其發生的機會。當發生植體失敗時,簡單則只需要更換螺絲組件等,若無法如此解決,則常意味著要二次手術。
    人工牙根鎖合螺釘發生疲勞斷裂,其原因可能是患者的特殊咀嚼習慣,若在第二次手術或重新更換鎖合螺釘時,手術者未能瞭解此特殊的情形,則重新裝入的鎖合螺釘依然會發生疲勞斷裂。但當人工牙根的鎖合螺釘發生疲勞破壞後,並沒有一個方法或指標,可以提供任何訊息給牙醫師,使其知道此鎖合螺釘已經承受了多少次與多大的重複性負荷以及病人的人工植體是否處於一個正常的受力狀態中。
    因此本研究計劃利用動態材料試驗機,對植體的疲勞強度作一測試。首先進行緊配扭力檢測及靜態抗壓檢測,以求得適當的實驗參數,接著在負荷控制模式下進行動態疲勞測試,除提供斷裂試件以電子顯微鏡觀察植體破壞面的金相外,更利用有限元素分析描繪出受測人工牙根螺釘的疲勞限、S-N curve。
    結果顯示,所受的負荷力量愈小或負荷次數愈多時,其連接體螺釘斷面的平滑面比例愈大,且彼此成線性關係。而其中又以斷面平滑區長度比例與負荷力量的相關性最高(R2=0.8506, p<0.01)。
    有限元素的數值模擬,不但提供了內應力集中位置,更有效的計算出內應力大小。本研究希望藉此發展一套指標作為評估植體破壞的進程與原因的工具,並將分析所得的資料與臨床上的觀察作一比較,期提供植體設計與臨床應用一有用的資料。
    Dental implants have become increasingly important in oral rehabilitation. However, implant treatments still fail frequently. The implant per se has to withstand stresses induced by intraoral forces. Abnormal loading, as well as fatigue under physiological loads, can lead to fractures of certain implant components. These problems are always complicated by cyclic fatigue.
    Fracture or loosening is most likely to occur in the screw. As for fracture problems, however, it is difficult to predict which component will suffer fatigue and the resulting effects on the entire system. Important aspects of implant design are related to biomechanics of implant systems and the different materials used for implants. However, a reliable method for dentist or manufacturer to evaluate the mechanisms of implant fracture was still unavailable.
    In this study proposal, a serious dynamic mechanical were carried out to assess the maximum dynamic loading and fatigue life of the implants. To provide the optimal testing parameters, preloading tests and static tests were performed first. After the pretests, dynamic tests were performed under the mode of loading control with a sinusoid force. To provide an indicator for assessing the fracture mechanisms of the fracture screw, the fracture surface of the failed screws were observed and recorded by SEM observation. The fatigue life as well as S-N curve of the sample implant were also obtained and further analyzed by numeric analysis with finite element method.
    The results showed the ratio of the length and area of the smooth portion on the fracture surface increased with decreased loading magnitude and increased loading cycles. It demonstrated linear relationships and the reliability is the highest between length ratio of the smooth area and loading magnitude (R2=0.8506, p<0.01). Besides, finite element analysis also demonstrated not only the stress concentrated area but the magnitude. The results obtained from this project will serve as important references for the future advance studies.
    資料類型: thesis
    顯示於類別:[牙醫學系] 博碩士論文

    文件中的檔案:

    檔案 描述 大小格式瀏覽次數
    摘要.doc28KbMicrosoft Word227檢視/開啟
    摘要.pdf75KbAdobe PDF309檢視/開啟
    摘要.ppt138KbMicrosoft Powerpoint238檢視/開啟
    摘要.ps484KbPostscript81檢視/開啟


    在TMUIR中所有的資料項目都受到原著作權保護.

    TAIR相關文章

    著作權聲明 Copyright Notice
    • 本平台之數位內容為臺北醫學大學所收錄之機構典藏,包含體系內各式學術著作及學術產出。秉持開放取用的精神,提供使用者進行資料檢索、下載與取用,惟仍請適度、合理地於合法範圍內使用本平台之內容,以尊重著作權人之權益。商業上之利用,請先取得著作權人之授權。

      The digital content on this platform is part of the Taipei Medical University Institutional Repository, featuring various academic works and outputs from the institution. It offers free access to academic research and public education for non-commercial use. Please use the content appropriately and within legal boundaries to respect copyright owners' rights. For commercial use, please obtain prior authorization from the copyright owner.

    • 瀏覽或使用本平台,視同使用者已完全接受並瞭解聲明中所有規範、中華民國相關法規、一切國際網路規定及使用慣例,並不得為任何不法目的使用TMUIR。

      By utilising the platform, users are deemed to have fully accepted and understood all the regulations set out in the statement, relevant laws of the Republic of China, all international internet regulations, and usage conventions. Furthermore, users must not use TMUIR for any illegal purposes.

    • 本平台盡力防止侵害著作權人之權益。若發現本平台之數位內容有侵害著作權人權益情事者,煩請權利人通知本平台維護人員([email protected]),將立即採取移除該數位著作等補救措施。

      TMUIR is made to protect the interests of copyright owners. If you believe that any material on the website infringes copyright, please contact our staff([email protected]). We will remove the work from the repository.

    Back to Top
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回饋