Accuracy of electronic apical functions of a new integrated motor compared to the visual control of the working length—an ex vivo study
- 30 May 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Clinical Oral Investigations
- Vol. 25 (1), 231-236
- https://doi.org/10.1007/s00784-020-03357-7
Abstract
Objectives To evaluate ex vivo the efficacy of the integrated motor Tri Auto ZX2 in controlling the apical extent of preparation compared to conventional visual control (CVC) of the working length (WL). Materials and methods Eighty standardized mandibular premolars were divided into five groups (n = 16). In the CVC group, instruments were used in continuous rotation (CR) and visual control performed by means of rubber stoppers. For each of the remaining groups, it was assigned a combination of a motion (CR or optimal torque reverse (OTR)), and an apical function (Auto Apical Reverse (AAR) or Optimum Apical Stop (OAS)). Root canals were prepared using the apical functions at 0.5 mark using an alginate model. Difference between the final WL and the actual length post-instrumentation was calculated. Data were analyzed statistically with the significance set at 5% (ANOVA, Tukey HSD). Results There was no difference in the mean WL among the groups, except between the CR combined to OAS compared to CVC (P > 0.05). Although CVC resulted in two cases beyond the foramen, no significant difference was found among the groups when comparing the distributions of measurements (P > 0.05). Conclusions All combinations of motion and apical control functions of Tri Auto ZX2 provided an adequate apical limit ex vivo, similar to the visual control using rubber stoppers. Clinical relevance TriAuto ZX2 was efficient to control the apical extent of preparation dispensing the need for calibrating the files, regardless of the different settings. This motor might potentially prevent over-instrumentation by continuously monitoring the apical limit.Keywords
This publication has 34 references indexed in Scilit:
- Changes in Root Canal Length Determined during Mechanical Preparation Stages and Their Relationship with the Accuracy of Root ZX IIJournal of Endodontics, 2016
- Clinical Efficacy of Electronic Apex Locators: Systematic ReviewJournal of Endodontics, 2014
- Influence of Preflaring on the Accuracy of Length Determination With Four Electronic Apex LocatorsJournal of Endodontics, 2009
- Combination of apex locator and endodontic motor for continuous length control during root canal treatmentInternational Endodontic Journal, 2009
- Consistency of Apex Locator Function: A Clinical StudyJournal of Endodontics, 2009
- The fundamental operating principles of electronic root canal length measurement devicesInternational Endodontic Journal, 2006
- A simple mounting model for consistent determination of the accuracy and repeatability of apex locatorsInternational Endodontic Journal, 2006
- Accuracy of Root Length Determination Using Tri Auto ZX and ProTaper Instruments: An In Vitro StudyJournal of Endodontics, 2006
- Effect of preflaring on Root ZX apex locatorsJournal of Endodontics, 1999
- Apical extent of rotary canal instrumentation with an apexlocating handpiece in vitroOral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 1998