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Variations in stroke rate and loading using hand sonic or ultrasonic instrumentation
Author(s) -
Lumley P. J.,
Walmsley A. D.,
Harrington E.,
Marquis P. M.
Publication year - 1993
Publication title -
dental traumatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 81
eISSN - 1600-9657
pISSN - 1600-4469
DOI - 10.1111/j.1600-9657.1993.tb00266.x
Subject(s) - molar , instrumentation (computer programming) , ultrasonic sensor , stroke (engine) , significant difference , biomedical engineering , materials science , dentistry , orthodontics , medicine , computer science , engineering , mechanical engineering , radiology , operating system
Abstract An in vitro model system was developed to investigate the stroke rate and loading during hand, sonic, or ultrasonic instrumentation. The model system consisted of a mandibular molar tooth attached to a strain gauge and interface to a computer. Ten clinicians instrumented the distal canal of lower molar teeth. Stroke rates used and loads applied were measured using different sized files with the three different preparation techniques. There was no significant difference in stroke rates between different file sizes (p>0.05) within the same generator, however, stroke rate for hand was significantly slower than for sonic or ultrasonic (p<0.01). Loading of the canal wall rose with increase in file size which was significant for hand (p<0.01) and sonic (p<0.05) but not ultrasonic (p>0.05). There was a tendency for loading to be higher with hand instrumentation, this however was not significant (p>0.05).