PMID: 9540091Apr 16, 1998Paper

Apical extent of rotary canal instrumentation with an apex-locating handpiece in vitro

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics
D CampbellS Keila

Abstract

The Tri Auto ZX (J. Morita Co., Kyoto, Japan) is a cordless endodontic handpiece with a built-in apex locator that is programmed to reverse the direction of rotation when the file reaches a predetermined apical level or when torque becomes excessive. The purpose of this investigation was to examine the apical extent of rotary canal instrumentation and the ability to maintain apical constriction with the Tri Auto ZX at different automated settings. In 60 extracted teeth, canals were measured to the apical constriction, first visually and then electronically with the Tri Auto ZX; then they were instrumented with nickel titanium rotary files. For the instrumentation, the automatic apical reverse mechanism of the handpiece was set to 1, 1.5, or 2; these settings correspond to different distances from the apical foramen. Instrumentation was carried out apically until rotation was reversed by the automatic apical reverse function; the instrumented length was then measured, and the canal was filled with gutta-percha and sealer. The integrity of the apical constriction was assessed by exposing the apical 4 mm of the canal and observing the dentin-cementum junction. Paired t-tests were used to compare the visually measured length, the e...Continue Reading

References

Aug 1, 1971·Oral Surgery, Oral Medicine, and Oral Pathology·S W Schneider
Mar 1, 1983·Journal of Endodontics·J Ushiyama
Oct 1, 1984·International Endodontic Journal·P M DummerD G Rees
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Citations

Aug 21, 2007·Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics·Ricardo Affonso BernardesClovis M Bramante
Feb 18, 2009·International Endodontic Journal·M J AltenburgerE Hellwig
Apr 24, 2012·International Endodontic Journal·G FadelE Carneiro
Jun 11, 2004·International Endodontic Journal·M P J Gordon, N P Chandler
Jun 17, 2008·Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics·Károly KrajczárVilmos Tóth
Nov 11, 2003·Journal of Endodontics·Anthony S ThomasPeter C Moon
Jun 1, 2020·Clinical Oral Investigations·Adriane Antoniw KlemzUlisses Xavier da Silva Neto

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