| 研究生: |
李則孝 Li, Tse-Hsiao |
|---|---|
| 論文名稱: |
單成分汞齊合金微滲漏與機械性質研究 Microleakage and Mechanical Properties of Single Composition Dental Amalgam |
| 指導教授: |
陳瑾惠
Chern Lin, Jiin-Huey 朱建平 Ju, Chien-Ping |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 材料科學及工程學系 Department of Materials Science and Engineering |
| 論文出版年: | 2006 |
| 畢業學年度: | 94 |
| 語文別: | 中文 |
| 論文頁數: | 149 |
| 中文關鍵詞: | 汞齊合金 、銀粉 |
| 外文關鍵詞: | Amalgam |
| 相關次數: | 點閱:52 下載:3 |
| 分享至: |
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每天的生活當中,因為接觸到的食物溫度不盡相同,且填補的材料和牙齒的熱膨脹係數不同。在環境溫度經常變化的情況下,因為冷熱循環會造成填充材料和牙齒面間會產生錯開的現象,唾液以及細菌、離子和分子將會從縫隙滲入,產生二次蛀牙、發炎以及牙齒變色之類的疾病。如果能有效避免微滲漏(Micro-leakage)產生,就能有效的延長填補後材料的壽命,而且更能有效避免細菌從縫隙跑入,造成二次蛀牙。
且基於先前學長研究之結論,合金粉末經過熱處理,能有助於提升汞齊合金之性質。本實驗選用自行配料、噴粉之汞齊合金粉末AT 及實驗對照組商用汞齊合金Tytin,先測試粉末在溫度下持溫兩天及改變球磨製程的狀況下能否維持其性質,最後選擇最佳之材料來進行冷熱循環實驗及填補牙齒後之微滲漏測試。在實驗結果經比較後,熱處理仍有較佳之汞釋出及操作性質;行星式球磨在特定條件也能有相似傳統球磨之效果;取較佳之材料做冷熱循環測試,發現七天水浴及冷熱循環後,ATH30、AT10BC10H30(650 r.p.m)合金抗壓及抗拉強度仍有很好之性質;在抗壓強度上,經過冷熱循環強度有些許之提升。在填補牙齒之微滲漏實驗,發現ATH30、AT10BC10H30 (650 r.p.m)合金,也有不錯之抗微滲漏性質。
Microleakage has been identified as a significant problem with amalgam because of interfacial gap formation and can result in tooth discoloration ,pulp irritation and secondary caries.
In the recent research,we could find many records about heat treatment amalgam powders.It can reduce amalgam mecury release and increase mechanical properties.
This study was initiated to evaluate different ball mill mode(time、speed) with different heat treatment.We chose two of these and proceed with thermalcycling. During some mechanical tests ,we used three amalgam restorations:Tytin、ATH30、
AT10BC10H30 .And then we evaluated the effect of different amalgam restoratives during long-term thermocycling in microleakage .
A total of 90 teeth with amalgam restorations were divided into 3 groups (N=30) ,and inserted in Class V (2*2*2mm) preparations in human molars.Teeth were thermocycled for 1000 cycles in artificial saliva at 5°C and 55°C baths with a dwell time of 30 sec in each bath.The teeth were subsequently immersed in basic fuchsin dye (24 hour) and sectioned to allow assessment of microleakage . Finally,we found not only mechanical but microleakage properties ,ATH30 and AT10BC10H30 have good qualities.
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