Journal
INTERNATIONAL ENDODONTIC JOURNAL
Volume 36, Issue 4, Pages 246-255Publisher
WILEY
DOI: 10.1046/j.1365-2591.2003.00661.x
Keywords
dental education; nickel-titanium; root canal preparation; simulated root canals; teaching; undergraduate
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Aim To investigate root canal shaping with manual stainless steel files and rotary Ni-Ti files by students. Methodology Two hundred and ten simulated root canals with the same geometrical shape and size in acrylic resin blocks were prepared by 21 undergraduate dental students with manual stainless steel files using a stepback technique or with rotary Ni-Ti files in crown-down technique. Preparation length, canal shape, incidence of fracture and preparation time were investigated. Results Zips and elbows occurred significantly (P < 0.001) less frequently with rotary than with manual preparation. The correct preparation length was achieved significantly (P < 0.05) more often with rotary Ni-Ti files than with manual stainless steel files. Fractures occurred significantly (P < 0.05) less frequently with hand instrumentation. The mean time required for manual preparation was significantly (P < 0.001) longer than that required for rotary preparation. Prior experience with a hand preparation technique was not reflected in an improved quality of the subsequent engine-driven preparation. Conclusions Inexperienced operators achieved better canal preparations with rotary Ni-Ti instruments than with manual stainless steel files. However, rotary preparation was associated with significantly more fractures.
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