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研究生:黃祥恩
研究生(外文):Shuang-En Huang
論文名稱:熱處理於鎳鈦旋轉器械疲勞壽命之影響
論文名稱(外文):Effect of Heat Treatment on the Fatigue Life of Endodontic Rotary Instrument
指導教授:單秋成單秋成引用關係
指導教授(外文):Chow-Shing Shin
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:機械工程學研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2010
畢業學年度:98
語文別:中文
論文頁數:71
中文關鍵詞:鎳鈦旋轉器械疲勞破壞熱處理超深冷處理再結晶現象相變態溫度殘留張應力
外文關鍵詞:NiTi endodontic rotary instrumentFatigue fractureHeat treatmentCryogenic
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牙科根管治療多為利用鎳鈦旋轉器械將發炎和壞死的牙髓組織移除,由於牙齒根管結構多為弧形通道,因此根管治療時鎳鈦旋轉器械受到張應力(tension)和壓應力(compression)的反覆應力作用下,容易產生無預警的斷裂。目前尚無方法能在臨床上測定鎳鈦旋轉器械何時斷裂,部分學者提到鎳鈦合金線經過熱處理後會影響其疲勞壽命。有學者探討不同熱處理溫度對鎳鈦根管銼疲勞壽命的影響,卻忽略了不同應變下的疲勞壽命變化。本文利用熱處理設備將部分鎳鈦旋轉器械進行退火熱處理,以實驗室開發之疲勞試驗機台進行不同應變的根管銼疲勞壽命檢測,並透過DSC與EPMA探討經過處理後鎳鈦旋轉器械性質的變化。本研究結果顯示,本文的HT400熱處理曲線以及HT600熱處理曲線對鎳鈦根管銼疲勞壽命有顯著提升,在四種應變下的疲勞壽命測試結果顯示HT400可提升疲勞壽命約2.05~2.8倍,HT600可提升疲勞壽命約1.7~5.2倍。DSC實驗結果顯示熱處理後鎳鈦合金的相變態溫度產生改變,EPMA結果顯示鎳鈦合金於熱處理程序中材料內部並無滲入原子。

另外本文將部份鎳鈦旋轉器械先經過熱處理後,接著進行超深冷處理,得到不同應變情形下根管銼的疲勞壽命變化:經過超深冷處理的鎳鈦根管銼其疲勞壽命僅在HT600的熱處理曲線與R7.5A60金屬彎道中有顯著的提升。本文研究結果顯示,經過熱處理的鎳鈦根管銼其疲勞壽命可望有所提升,臨床應用上藉由熱處理根管銼使其疲勞壽命增加則可以提升醫療品質以及節省醫療資源。

口試委員審定書 i
誌謝 ii
中文摘要 iii
Abstract iv
目 錄 v
圖目錄 ix
表目錄 xii
第一章 導論 1
1-1 前言 1
1-2 研究動機 1
1-3 研究方法 2
1-4 論文架構 2
第二章 文獻回顧 4
2-1 鎳鈦形狀記憶合金 4
2-1-1相變態與形狀記憶效果 4
2-1-2超彈性(Superelasticity) 4
2-2 鎳鈦旋轉器械 5
2-2-1鎳鈦旋轉器械製造 5
2-2-2鎳鈦旋轉器械臨床應用的破壞機制 5
2-2-3鎳鈦旋轉器械的疲勞破壞 6
2-3 根管銼疲勞壽命測試 7
2-3-1 Schneider Angle 與Pruett彎度定義 7
2-3-2 各種疲勞壽命評估方法 8
2-4 鎳鈦根管銼改質 9
2-4-1 熱處理 9
2-4-2 超深冷處理 10
2-5 示差掃描熱量測定(Differential Scanning Calorimetry, DSC) 11
第三章 實驗材料與設備 21
3-1實驗材料 21
3-2熱處理設備 21
3-3超深冷處理設備 21
3-4疲勞試驗機台 21
X-Y方向移動平台 22
3-5 J-Type 熱電偶(Thermocouple) 23
3-6低溫調幅式示差掃描熱量分析儀(LT-Modulate DSC) 23
3-7 電子微探儀(Electron Probe X-ray MicroAnalyzer, EPMA) 23
第四章 實驗原理與方法 28
4-1實驗流程 28
4-2鎳鈦旋轉器械之熱處理 28
4-2-1 實驗規劃 28
4-2-2 實驗步驟 29
4-3鎳鈦旋轉器械之超深冷處理 29
4-3-1 實驗規劃 29
4-3-2 實驗步驟 30
4-4鎳鈦旋轉器械之疲勞試驗 30
4-4-1根管彎道設定 30
4-4-2根管在彎道中接觸情況 30
4-4-3疲勞試驗操作步驟 31
4-4-4以One-way ANOVA分析疲勞試驗數據 32
4-5示差掃描熱量測定(DSC) 32
4-5-1樣品準備 33
4-5-2實驗條件 33
4-6 電子微探儀(EPMA) 33
4-7 金相實驗 34
第五章 實驗結果與討論 38
5-1示差掃描熱量測定(DSC) 38
5-1-1熱處理對相變態溫度的影響 38
5-1-2熱處理對室溫相的影響 38
5-1-3熱處理對熱焓變化量的影響(Heat flow) 39
5-2鎳鈦根管銼疲勞壽命實驗 40
5-2-1 熱處理對根管銼疲勞壽命之影響 40
5-2-2超深冷處理對根管銼疲勞壽命之影響 42
5-2-3以One-way ANOVA分析疲勞實驗數據 43
5-3電子微探儀(EPMA) 44
5-7 金相實驗 44
第六章 結論與未來目標 65
6-1結論 65
6-2未來目標 66
參考文獻 68


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