Extended apical enlargement with hand files versus rotary NiTi files. Part II

The objective of this study was to compare 2 preparation techniques performed under simulated clinical conditions with extended apical enlargement following determination of the optimal apical preparation size (APS). After preflaring 240 root canals, APS was evaluated as outlined in Part I. The apic...

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Published inOral surgery, oral medicine, oral pathology, oral radiology and endodontics Vol. 102; no. 5; pp. 692 - 697
Main Authors Bartha, Tibor, Kalwitzki, Matthias, Löst, Claus, Weiger, Roland
Format Journal Article
LanguageEnglish
Published St. Louis, MO Mosby, Inc 01.11.2006
Elsevier
Subjects
Algorithms
Biological and medical sciences
Dental Alloys
Dental Instruments
Dental Pulp Cavity - anatomy & histology
Dentistry
Equipment Design
Humans
Medical sciences
Molar - anatomy & histology
Nickel
Observer Variation
Odontometry
Otorhinolaryngology. Stomatology
Reference Values
Root Canal Preparation - instrumentation
Titanium
Tooth Apex - anatomy & histology
Hand
Comparative study
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Summary:The objective of this study was to compare 2 preparation techniques performed under simulated clinical conditions with extended apical enlargement following determination of the optimal apical preparation size (APS). After preflaring 240 root canals, APS was evaluated as outlined in Part I. The apical portion was shaped to APS either with rotary NiTi Lightspeed instruments (LS) or NiTi hand instruments (HA) using the balanced force technique in a phantom head. After sectioning the apical area at 3 levels, every cross section was analyzed microscopically for circumferential removal of canal wall dentine. Loss of working length, instrument separation, and perforation were additionally recorded. In 70% (LS) and 69% (HA) of the root canals, 2 of 3 levels demonstrated that the root canal dentin was cut circumferentially. Neither loss of working length nor perforation occurred in both groups. Four LS instruments separated. APS frequently results in a nearly complete apical preparation regardless of the preparation techniques. In a few cases apical enlargement to APS does not achieve complete cutting of the canal walls. There was a rather slight risk of serious procedural errors.
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ISSN:1079-2104
1528-395X
DOI:10.1016/j.tripleo.2005.11.014