Section Original Articles
Evaluation of the accuracy of working length determination and automatic apical reverse function accuracy of endodontic rotary motor integrated apex locator: an in-vitro study
The outcome of a Root canal therapy depends upon complete cleaning of the root canal system without damaging periapical integrity. Accurate determination of working length determination is essential. The development of Endodontic motor integrated apex locators (EALs) for locating canal terminus has been significant innovation in the field of Endodontics.
To evaluate the accuracy of Endomotor integrated electronic apex locator in determining the working length before and after cleaning and shaping with Automatic Apical Reverse action set at the "0.5mm" mark.
Forty extracted premolars were decoronated, patency was verified. The actual length of tooth measured and teeth were embedded in alginate and file was advanced. Readings at the apex and 0.5mm short of the apex was recorded using Dentaport ZX (DZ group) and EConnect S (ES group) apex locator. Cleaning and shaping were done with rotary files with Automatic Apical Reverse action set at 0.5mm short of apex and reading recorded as Automatic Apical Reverse Length (AARL), and actual tooth length is measured. The data obtained were statistically analyzed.
Within the limitations of the study, the EALs readings of the DZ group & ES group provided an acceptable determination of working length within range ± 0.5mm, and AAR function set at 0.5mm mark of Endomotor integrated apex locator (E Connect S) provided an adequate apical limit.
Under the invitro conditions of this study, both Electronic Apex Locators showed an acceptable determination of working length within range ± 0.5mm from the actual length. The AAR function set at the 0.5mm mark of Econnect S provided an adequate apical limit.
1. Ricucci D, Langeland K. Apical limit of root canal instrumentation and obturation, part 2. A histological study. Int Endod J 1998;31:394–409.
2. Nekoofar et al., The Fundamental Operating Principles ofElectronic Root Canal Length Measuring Devices. Int Endodont J. 2006; 39: 595-609.
3. A.K. Ebrahim, R. Wadachi and H. Suda. Electronic Apex Locators – A Review. J Med Dent Sci. 2007; 54,125-136.
4. Vasconcelos BC, Frota LM, de Abreu Souza T, et al. Evaluation of the maintenance of the apical limit during instrumentation with hybrid equipment in rotary and reciprocating
modes. J Endod 2015;41:682–5.
5. Kobayashi C. Electronic canal length measurement. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 1995;79:226 31.
6. Piasecki L, Carneiro E, da Silva Neto UX, et al. The use of micro–computed tomography to determine the accuracy of 2 electronic apex locators and anatomic variations affecting their precision. J Endod 2016;42:1263–7.
7. Baldi JV, Victorino FR, Bernardes RA, de Moraes IG, Bramante CM, Garcia RB, et al.
Influence of embedding media on the assessment of electronic apex locators. J Endod 2007;33:476 9.
8. Camargo EJ, Zapata RO, Medeiros PL, et al. Influence of preflaring on the accuracy of length determination with 4 electronic apex locators. J Endod 2009;35:1300–2.
9. Wu MK, Wesselink PR, Walton RE. Apical terminus location of root canal treatment procedures. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2000;89:99–103.
10. Vasconcelos BC, Bastos LM, Oliveira AS, et al. Changes in root canal length determined during mechanical preparation stages and their relationship with the accuracy of Root ZX II. J Endodont 2016;42:1683–6.