Key result
ProFile and ProTaper use is linked to wedged dentinal deposits in micro-cracks driving clinical failure.
Population
Discarded ProFile and ProTaper nickel-titanium rotary instruments with unknown history of clinical use from…
Comparison
Clinical use (in vivo root canal preparation) vs As-received (unused) instruments of both types
Design
Other
Authors
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Dentinal deposits may drive NiTi failure; leaves open whether design changes reduce fracture rates.
Observational
Yes
Wedged dentinal deposits in surface micro-cracks appear to play a pivotal role in the clinical failure of nickel-titanium rotary endodontic instruments.
Alapati et al. (2004) conducted an observational in Clinical failure of nickel-titanium rotary instruments. Clinical use of nickel-titanium rotary instruments vs. As-received (unused) instruments was evaluated on Effects of clinical use and causes of failure (wedged dentinal debris and surface micro-cracks). Clinical use of ProFile and ProTaper instruments resulted in wedged dentinal deposits in surface micro-cracks, which appear to play a pivotal role in clinical failure.
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