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研究生:洪啟智
研究生(外文):Chi-Jr
論文名稱:根管沖洗液對鎳鈦旋轉器械疲勞的探討
論文名稱(外文):Influence of Endodontic Irrigants on Fatigue Resistance of Nickel-titanium Instruments
指導教授:黃翠賢
指導教授(外文):Tsui-Hsien Huang
學位類別:碩士
校院名稱:中山醫學大學
系所名稱:口腔材料科學研究所
學門:醫藥衛生學門
學類:牙醫學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:94
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鎳鈦旋轉器械提供了臨床醫師更大的錐度、超彈性以及更好的強度。然而,在臨時使用時,有許多因素造成器械無預期地斷裂。當在操作時,溶液存在根管或是牙髓腔做為消毒或是潤滑時,鎳鈦器械會與溶液接觸。本實驗的目的是要評估Protaper鎳鈦旋轉器械,在浸泡過次氯酸鈉或是CHX溶液後,疲勞斷裂的影響。
第一部份實驗,第一組為對照組。第二組浸泡於37℃的5.25% NaOCl 環境下兩個小時。第三組浸泡於37℃的2% CHX環境下兩個小時。之後進行疲勞測試,記錄下斷裂所需的時間及斷裂的長度。另外也使用電子顯微鏡來觀察器械的表面。第二部分則是藉由電化學分析的方法,來測試器械在溶液中的腐蝕行為。從每個曲線當中,使用軟體計算出腐蝕電流以及電阻。並使用t test做分析。
結果顯示,除了F2以外,幾乎所有的器械號碼愈大,愈容易斷裂。次氯酸鈉溶液似乎對於器械的腐蝕較CHX嚴重,並且會影響疲勞斷裂的結果,特別是在較大直徑的器械。電子顯微鏡的觀察顯示器械表面有腐蝕的現象。此外,電化學的分析顯示,次氯酸鈉對於器械的腐蝕速率較CHX為快。


The introduction of NiTi instruments into endodontics has provided the profession with rotary instruments of greater taper, with characteristics of super-elasticity and high strength. However, various factors may cause unexpected fracture during clinical use of NiTi Rotary instruments. NiTi instruments come into contact with irrigants during disinfection or when the solution is present in the pulp chamber and root canal during instrumentation. The aim in this study was to evaluate the effect of immersion in NaOCl or CHX solution on the resistance of Protaper Rotary instruments to cyclic fatigue fracture.
Except Protaper SX, a total of 90 new Protaper NiTi Rotary files (S1, S2, F1, F2, F3) were randomized and assigned to three different groups and five subgroups. Group 1 was the control group. Group 2 was immersed in 5.25% NaOCl at 37℃ for 2 hours. Group 3 was immersed in 2% CHX at 37℃ for 2 hours. All instruments were then tested for cyclic fatigue, record the time to fracture and length of fracture. Data were analysed by one-way ANOVA test and Tukey HSD for post-hoc comparisons. Micromorphological changes were completed by means of a field emission scanning electron microscopy (SEM).
The second part was to test the corrosion behavior of Protaper F3 in NaOCl and CHX irrigating solutions by the potentiodynamic polarization method. Corrosion current density (Icorr) and corrosion potential (Ecorr) were calculated from each curve. The results were statistically analysed with t test.
Except F2, almost all instruments had a lower fatigue resistance to fracture with instrument size. The NaOCl solution seems to corrode the instruments more than the CHX solution. SEM observations revealed evident signs of corrosion of the fractured instruments. Moreover, instrument demonstrated higher corrosion rate in NaOCl solution than CHX solution.
The NaOCl solution can corrode the Protaper NiTi Rotary files, thus affect the fatigue fracture time, especially the larger size instruments. We should pay more attention to the use of irrigating solution.


第一章 文獻回顧及理論基礎 12
1.1根管治療 12
1.2 器械分離 12
1.3 根管沖洗液 14
1.4 沖洗液對器械的影響 15
1.5 鎳鈦合金在根管治療方面的發展 16
1.6 金屬材料的破壞性質 (Fracture of metals) 17
1.6.1延性破壞 18
1.6.2 脆性破壞 18
1.7 金屬疲勞 19
1.7.1 金屬材料的疲勞性質 19
1.7.2 延性金屬材料在疲勞過程發生的變化 20
1.7.3 影響疲勞強度的重要因素 22
1.8 金屬的腐蝕機轉 23
1.9 腐蝕形式 (Forms of corrosion) 26
1.9.1 均勻腐蝕 (Uniform attack) 26
1.9.2 伽凡尼腐蝕 (Galvanic corrosion) 26
1.9.3 間隙腐蝕 (Crevice corrosion) 27
1.9.4孔蝕 (Pitting corrosion) 28
1.9.5 粒間腐蝕 (Intergranular corrosion) 28
1.9.6 選擇性剝離 (Selective leaching) 29
1.9.7 沖蝕-腐蝕 (Erosion-corrosion) 29
1.9.8 應力腐蝕 (Stress corrosion) 30
1.10 研究動機與目的 31
1.11 假說 32
1.12 論文架構 33
第二章 材料與方法 34
2.1儀器裝置 (Instruments) 34
2.2實驗材料 (Materials) 35
2.3疲勞測試 (Cyclic fatigue-testing) 36
2.3.1 實驗準備工作 37
2.3.2 疲勞測試 (Cyclic fatigue testing) 40
2.3.3 顯微結構分析 41
2.3.4 統計分析 42
2.4 浸泡過溶液的疲勞測試 43
2.4.1 實驗準備工作 43
2.4.2 疲勞測試 44
2.4.3 顯微結構分析 44
2.4.4 統計分析 44
2.5 耐蝕性測試 (Corrosion test) 45
2.5.1 實驗準備工作 45
2.5.2 腐蝕測試 (Corrosion test) 49
2.5.3 資料分析 50
第三章 實驗結果 51
3.1 疲勞測試 51
3.3.1 疲勞數據分析 51
3.1.2 斷裂面分析 51
3.2 浸泡過溶液的疲勞測試 52
3.2.1 疲勞數據分析 52
3.2.2 斷裂面分析 53
3.3 耐蝕性測試 (Corrosion test) 54
第四章 討論 56
第五章 結論 61
第六章 參考文獻 87


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