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研究生：	嚴月君 Yen, Yueh-chun
論文名稱：	鎳鈦矯正線及矯正托架在應力狀態下腐蝕性質之研究 Corrosion behavior of orthodontic archwire coupled to bracket under bending stress
指導教授：	張川陽 Chang, Chuan-yang 李澤民 Lee, Tzer-min 劉佳觀 Liu, Jia-Kuang
學位類別：	碩士 Master
系所名稱：	醫學院 - 口腔醫學研究所 Institute of Oral Medicine
論文出版年：	2009
畢業學年度：	97
語文別：	英文
論文頁數：	83
中文關鍵詞：	腐蝕、離子釋出、應力、鎳鈦線、矯正托架
外文關鍵詞：	ion release, stress, corrosion, bracket, NiTi wire
相關次數：	點閱：77 下載：2
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利用矯正托架合併矯正線是目前矯正牙齒移動的主流。現在市面上也有多種材料可供選擇。但人體口腔是酸性環境，且含有數百種微生物及酵素組成，是一極容易產生腐蝕反應的環境。在矯正治療時期，由於口腔內存在矯正線和矯正托架兩種以上不同金屬同時也處於應力狀態下，所以可能產生伽凡尼腐蝕和應力腐蝕。由於先前實驗只探討矯正托架合併矯正線之伽凡尼腐蝕或應力狀態下之矯正線的應力腐蝕。因此本研究目的為探討不鏽鋼矯正托架合併鎳鈦矯正線在應力狀態下的腐蝕性質。首先對鎳鈦線合併矯正托架進行循環動電位試驗來計算各項腐蝕參數，實驗皆控制在攝氏37度，酸鹼值再分為2和5兩組以模擬人體口腔環境，並藉掃瞄式電子顯微鏡分析表面型態。結果發現經試驗的矯正托架和鎳鈦線接觸處確實在表面呈現不規則性，腐蝕機制也受應力影響，尤其在矯正托架的應力區更出現明顯的孔穴腐蝕。此外應力組的鈍化區電流密度也較高。而且兩種不同鎳鈦線有不同的腐蝕機轉。在定電位試驗中，本實驗也觀察到因鈍化層破壞而造成電流密度上升的趨勢。鈍化層是提供生物相容性很重要的一環，一旦其遭受壞，將導致更多有害離子釋出。我們也於離子釋出實驗中發現，應力存在的確會有較多鎳離子釋出。在本研究中，我們確實發現應力對不鏽鋼矯正托架合併鎳鈦矯正線於臨床矯正應用扮演一重要角色，因此在臨床操作上不能忽視應力所造成的影響。對金屬矯正裝置的防蝕設計，將是目前矯正材料發展一大趨勢。

Bracket coupled to wire systems are commonly used in modern orthodontics to move teeth. Practitioners can choose from a wide range of wires and brackets made from different alloys. Oral environment is a particularly suitable environment for corrosive attack on metals as there exist various microorganisms and enzymes in mouth. In orthodontic treatment, not only galvanic interaction commonly exists between the archwire and brackets but also its stress will induce corrosion process. The aim of our study is to provide a quantitative assessment of the galvanic corrosion behavior of archwire alloys coupled to bracket alloys under the effect of stress, then to analyze the oxide layer of wire, and finally to detect the amount of nickel ion release from galvanic and stress corrosion. All of our experiments were performed at 37℃ with modified Fusayama artificial saliva with pH 2 and 5, respectively. At first, cyclic potentiodynamic test was carried out to gain corrosion parameters and surface topography was analyzed by means of scanning electronic microscopy (SEM) of nickel titanium wire coupled to bracket. The current density in passive region under stress condition was greater than that of unstressed specimens. Up to present, in the absence of stress, the corrosion mechanism in Nitinol Classic® and Sentalloy® was dominated by uniform corrosion; in brackets, two corrosion patterns were noted, including pitting corrosion in wing and grain boundary as well as crevice corrosion in the slot. In the presence of stress, Sentalloy® showed uniform corrosion, whereas Nitinol Classic® has uniform and pitting corrosion at stress area, no mater if wing or slot in brackets were of pitting corrosion and grain boundary corrosion. In potentiostatic test under the stimulated oral potential, the passive film of bracket and wire were spoiled. The current density in passive region was found unstable and higher in loaded mode. Greater release of nickel ion from loaded specimen was evident. We can conclude that the more the acidity, the more easily the corrosion reaction initiates, as well as stress can accelerate the corrosion rate.

中文摘要 I
Abstract II
誌謝 III
Table of contents IV
List of tables VII
List of figures VIII
Symbols  XII
Chapter 1. Introduction 1
 1-1	 Background  1
 1-2	 Literatures review 2
 1-2-1	 History of NiTi wire 2
 1-2-2	 Definition of corrosion 5
 1-2-3	 Forms of corrosion 5
 1-2-4	 Electrochemical corrosion theory 6
 1-2-5	 Electrochemical methods 7
 1-2-6	 Corrosion of NiTi wire 8
 1-3	 Motivation 12
 1-4	 Objective 12
Chapter 2. Materials and methods 13
 2-1	 Experimental flowchart 13
 2-2	 Materials 13
 2-2-1	 Experimental materials 13
 2-2-2	 Buffer preparation 14
 2-3	 Cyclic potentiodynamic polarization test 14
 2-3-1	 Design of the fixture 14
 2-3-1-1 Bracket alloy only 14
 2-3-1-2 Bracket alloys coupled to archwire alloys 14
 2-3-2	 Sample preparation 15
 2-3-3	 Measurement of parameters of cyclic potentiodynamic polarization test…15
 2-3-4	 Surface analysis 16
 2-4	 Potentiostatic test 16
 2-4-1	 Design of the fixture 16
 2-4-2	 Sample preparation 16
 2-4-3	 Procedure of potentiostatic test 17
 2-4-4	 Surface analysis 17
 2-5	 Immersion test 17
 2-5-1	 Design of the fixture 17
 2-5-1-1 Bracket only 17
 2-5-1-2 Bracket alloys coupled to archwire alloys 18
 2-5-2	 Sample preparation 18
 2-5-3	 Ion release analysis 18
Chapter 3. Results 20
 3-1	 Cyclic potentiodynamic polarization test 20
 3-1-1	 Parameters of cyclic potentiodynamic test 20
 3-1-1-1 Stainless steel bracket only 20
 3-1-1-2 Bracket alloys coupled to archwire alloys under loading versus unloading at pH5 20
 3-1-1-3 Bracket alloys coupled to archwire alloys under loading versus unloading at pH2 21
 3-1-2	 Surface analysis 22
 3-2	 Potentiostatic test 23
 3-2-1	 The relationship of current density and time 23
 3-2-1-1 Stainless steel bracket only 23
 3-2-1-2 Bracket alloys coupled to archwire alloys under loading versus unloading at pH5 23
 3-2-1-3 Bracket alloys coupled to archwire alloys under loading versus unloading at pH 2 24
 3-2-2	 Surface analysis 25
 3-3	 Immersion test 25
 3-3-1	 The amount of ion release 25
 3-3-1-1 Stainless steel bracket only 25
 3-3-1-2 Bracket alloys coupled to archwire alloys under loading versus unloading at pH5 25
 3-3-1-3 Bracket alloys coupled to archwire alloys under loading versus unloading at pH2 26
Chapter 4. Discussion 27
 4-1	 Cyclic potentiodynamic polarization test 27
 4-1-1	 Galvanic interaction or not 27
 4-1-2	 The effect of loading or not 27
 4-1-3	 The effect of pH value 29
 4-1-4	 The effect of different alloy 29
 4-2	 Potentiostatic test 30
 4-2-1	 The effect of loading or not 30
 4-2-2	 The effect of pH value 31
 4-3	 The limitation of our study 32
 4-4	 Immersion test 33
 4-4-1	 The effect of pH value 34
 4-4-2	 The effect of loading or not 34
Chapter 5. Conclusion 35
Reference 36
                                    

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校內：2012-08-28公開
校外：2014-08-28公開

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