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BMC Oral Health

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Open Access 01-12-2017 | Research article

The accuracy of the auto-stop function of different endodontic devices in detecting the apical constriction

Authors: David W. Christofzik, Andreas Bartols, Mahmoud Khaled, Birte Größner-Schreiber, Christof E. Dörfer

Published in: BMC Oral Health | Issue 1/2017

Abstract

Background

Electronic apex locators (EALs) are modern devices used to determine the working length during root canal preparation. The newest endodontic motors provide an integrated EAL with auto-stop function to prevent instrumentation beyond the predefined working length during rotary root canal preparation. The aim of this study was to compare the accuracy of the auto-stop function of the VDW.Gold RECIPROC motor (VDW, Munich, Germany), the EndoPilot motor (Schlumbohm, Brokstedt, Germany) and the manual measurement with Raypex 6 (VDW, Munich, Germany) to detect the apical constriction (AC).

Methods

Ninety human teeth were chosen and randomly assigned to three experimental groups (30 teeth each): VDW.Gold RECIPROC motor continuous measuring (RCM), EndoPilot continuous measuring (ECM) and Raypex 6 manual measuring (RMM). When the measurement file reached the AC, the file was fixed in the tooth. The tooth was embedded in acrylic resin and the root tip was exposed, so that the histologic structure of the root canal and the file tip was visible for microscopic analysis. Afterwards, the distance of the file tip to the AC (D_AC) was automatically computed with a specially developed software tool.

Results

The mean D_AC were −13.18 μm (SD 88.46 μm) for RMM, −22.70 μm (SD 91.57 μm) for RCM and 18.74 μm (SD 88.11 μm) for ECM. The differences were not statistically significant (P = 0.181). The rates for instrumentation beyond the AC were not statistically different (Chi² = 4.753, p = 0.096).

Conclusions

All measurement methods showed a high accuracy in detecting the AC. The auto-stop function of these endodontic motors is a reliable addition to the endodontic armamentarium.

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Title: The accuracy of the auto-stop function of different endodontic devices in detecting the apical constriction
Authors: David W. Christofzik
Andreas Bartols
Mahmoud Khaled
Birte Größner-Schreiber
Christof E. Dörfer
Publication date: 01-12-2017
Publisher: BioMed Central
Published in: BMC Oral Health / Issue 1/2017
Electronic ISSN: 1472-6831
DOI: https://doi.org/10.1186/s12903-017-0425-y

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

The accuracy of the auto-stop function of different endodontic devices in detecting the apical constriction

Abstract

Background

Methods

Results

Conclusions

At a glance: The ONWARDS insulin icodec trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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