![]() ![]() If however the NiTi file is stressed beyond its elastic limit, it will break (8). This transformation usually happens when the metal is stressed, such as during the instrumentation of the root canal. NiTi is a ‘superelastic’ metallic alloy that, when flexed, undergoes an austenitic-martensitic transformation from its original structure making it extremely flexible (5,17,20,21). To fully understand the positive and negative aspects of this great technology let us first take a closer look at nickel titanium itself. ![]() The big disadvantage of this system is sudden file separation within the canal. With every great innovation however, comes a down side and NiTi rotary is no exception. This flexibility allows for navigation of the most complex and curved root canals. The extreme flexibility exhibited by these ‘heat treated’ nickel titanium instruments is the key (1,2,3,4,10). ![]() Where navigation of a curved canal with stainless steel instruments might be extremely difficult and time consuming, nickel titanium rotary, when used correctly, can allow for a seamless canal preparation. Stainless steel files became stiffer as the sizes increased. The beauty of nickel titanium is its flexibility and efficiency. That all changed with the advent of nickel titanium rotary instruments, and a torque controlled motor. This proved to be tedious and quite tiring for the practitioner. There was a time when one would spend multiple visits hand filing a canal with stainless steel instruments. There have been few innovations in endodontics as revolutionary as nickel titanium (NiTi) rotary. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |