熱處理於鎳鈦旋轉器械切削效率影響

Effect of Heat Treatment on Cutting Efficiency of Ni-Ti Endodontic Rotary Instrument

蔡淙宇(Tsung-Yu Tsai)

指導教授 ： 單秋成

國立臺灣大學/工學院/機械工程學研究所/碩士(2010年)

https://doi.org/10.6342/NTU.2010.03469

摘要

提升抗斷裂能力與切削效率是鎳鈦旋轉器械重要評估項目，而提升切削效率的方式除了改變鎳鈦旋轉器械外型的設計，也可以針對材料做各種不同的處理方式，以提升切削效率。因為熱處理退火方式可以消除冷加工所留下的殘留應力、增加材料延展性和韌性，再加上超深冷處理對於多種材料在耐磨耗性、使用壽命與此尺寸穩定性均有提升的效用，因此本文對鎳鈦旋轉器械作不同的熱處理方式，再分批進行超深冷處理。利用本實驗室現有的切削試驗機台評估不同熱處理方式對鎳鈦根管銼切削效率的影響，並且透過DSC、硬度實驗、靜態彎曲實驗探討不同熱處理方式對鎳鈦根管銼的變化。
結果顯示，當熱處理溫度為400℃時，之後再進行超深冷處理，對於切削效率的並沒有太大的提升作用，而當熱處理溫度為600℃，之後再進行超深冷處理，對於切削效率則有明顯的提升。

關鍵字

鎳鈦旋轉器械 ； 鎳鈦根管銼 ； 熱處理 ； 超深冷處理 ； 切削效率

並列摘要

Cutting efficiency and cyclic fatigue resistance are both important requirement of Ni-Ti endodontic rotary instruments. To improve cutting efficiency, there have been attempts to change shape as well as fabrication procedures or attempts to change the material property. It is well know that annealing can relieve residual stress by cold working and improve the material toughness and ductility. Furthermore it is also well know that cryogenic treatment can improve the wear-resistance, dimensional stability and usable life of tool steels. This study investigated the effect of heat treatment combines with cryogenic treatment on the cutting efficiency of Ni-Ti endodontic rotary instruments. We also found that the phase transition temperature, the stiffness and the hardness will be affected by the different heat treatments.
Finally, we found the cutting efficiency is not improvement when the heat treatment at 400℃ combines with cryogenic treatment, but it is improvement when the heat treatment at 600℃ combines with cryogenic treatment.

並列關鍵字

Ni-Ti endodontic rotary instrument ； Heat treatment ； Cryogenic treatment ； Cutting efficiency

參考文獻

[3] 林正程, 鎳鈦旋轉器械切削效率之研究, 碩士論文, 國立台灣大學, 2009.

[6] 蕭琮仁, 牙齒根管治療之鎳鈦旋轉器械完整性檢測與評估, 碩士學位論文, 國立台灣大學, 2004, p7-8.

[22] 陳佩謙, 熱機處理對富鎳鈦鎳形狀記憶合金多階相變態行為之研究, 碩士論文, 國立台灣大學, 2008.

[26] 華子傑, 超深冷設備改良及其在電鍍工件脫氫上之應用, 碩士論文, 國立台灣大學, 2009.

[2] E. Shafer and R.L. Cand, Comparison of Cutting Efficiency and Instrumentation of Curved Canals with Nickel-Titanium and Stainless-Steel Instruments, Journal of Endodontics, VOL. 25, No. 6, June 1999, p427-430