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ISSN : 0376-4672
1988년 스테인리스스틸 파일을 대체할 수 있는 유용한 재료로 초탄성(super-elasticity) 특징을 가진니켈티타늄(Nickel-Titanium; NiTi) 합금으로 만들어진 파일이 소개된 이후 20여 년이 경과하는 동안그 사용이 점진적으로 증가해 가고 있다1, 2). 스테인리스스틸 파일을 능가하는 NiTi 파일의 다양한 효용성을 지지하는 연구 결과가 많이 발표되고 있고, 이와 함께 많은 제조사들이 각기 고유의 특징과 장점을 주장하며 여러 가지 니켈티타늄 파일을 시판하고 있다3, 4). 국내에서도 최근 10년 그 사용이 폭발적으로 증가하는 추세라고 보여진다. 그러나, 임상에서의 사용이 증가함과 동시에, 사용 중 불가항력적으로 나타나는 파일의 파절 문제가 사용할 때마다 늘 함께하는 두려움과 고민거리가 되고 있다.
Nickel-Titanium(NiTi) rotary instruments have brought a big step toward “efficient” practice of endodontic procedure. Therotary files help clinicians to reduce their working time and also increase the clinical success rate with minimal procedural errorsby stainless steel instruments. In spite of these advantages, NiTi instruments still have a few drawbacks including unpredictablefatigue fracture. Clinicians may reduce the potential risk of instruments fracture by following some clinical guidelines for rotaryinstruments. In some clinical cases of instruments fracture, we may try to remove the instruments’ fragments or bypass thefragment to reach the apical canal. In some limited cases, the fractured instruments’ fragments would not jeopardize the clinicalprognosis of root canal treatment. However, it is impossible to be overemphasized that the fragment removal is more difficult thanthe prevention of fracture. Clinicians need to understand the fracture mechanisms and, in clinic, need to discard the usedinstruments timely.
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