Transcription of Current developments in rotary root canal instrument ...
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Current developments in rotary root canal instrument ...
VOLUME 41 NUMBER6 JUNE2010479 QUINTESSENCE INTERNATIONALThe introduction of nickel-titanium (Ni-Ti) toendodontics almost two decades ago1hasdramatically changed the way root canalpreparation is performed, in both generaland specialist practices. The perceived mostsignificant advantage lies in the predictabilitywith which a desired shape is more important, the use of rotaryinstruments requires attention to detail, eg,regarding the efficacy of antimicrobialregimes that further contribute to successfulendodontic therapy. Then, cases of varyingdegrees of difficulty can be successfully treat-ed, with excellent long-term outcomes (Fig 1).Not every instrument system is suitable forevery clinician, and not all cases lend them-selves to rotary preparation, mainly becauseof varying degrees of experience and com-plexity.
480 VOLUME 41 • NUMBER 6 • JUNE 2010 QUINTESSENCE INTERNATIONAL Peters/Paqué Fig 2a Temperature-dependent transition from austenitic (brittle, hard) to martensitic (soft) crystalline lattices. M f, M s, A f, A s indicate martensitic and austenitic starting and finishing temperatures, respectively.
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