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Shaping ability of ProFile rotary nickel-titanium instruments with ISO sized tips in simulated root canals: Part 2
S T Bryant1, S A Thompson, M A al-Omari
1Department of Restorative Dentistry, University of Wales College of Medicine, Cardiff, UK.
International Endodontic Journal
|November 21, 1998
Summary
ProFile nickel-titanium rotary instruments showed a higher than expected incidence of zipping in simulated root canals. However, the canal transportation was minimal, indicating limited and relatively minor shaping aberrations.
Area of Science:
- Endodontics
- Dental Materials Science
Background:
- Root canal preparation aims to clean and shape the canal space.
- Nickel-titanium rotary instruments offer improved flexibility and cutting efficiency for root canal preparation.
Purpose of the Study:
- To evaluate the shaping ability of ProFile 0.04 taper rotary nickel-titanium instruments in simulated root canals.
- To assess canal aberrations, transportation, and post-operative shape following preparation.
Main Methods:
- Simulated root canals with varying curvatures were prepared using ProFile instruments and the 'crown down' technique.
- Analysis of canal aberrations (zips, ledges, perforations) and canal transportation was performed.
Main Results:
- Nine zips (24%) and one ledge (3%) occurred in 37 specimens; no perforations were observed.
- Canal transportation was generally towards the outer aspect of curves and minimal (absolute transportation < 0.1 mm).
- Wider canal shaping was observed in canals with 40-degree curves compared to 20-degree curves.
Conclusions:
- ProFile nickel-titanium rotary instruments produced a higher incidence of zipping than anticipated.
- Despite zipping, the degree of canal transportation was limited and considered minor under study conditions.