Evaluation of the accuracy of a root canal treatment motor in determining root canal length

In vivo evaluation of the auto-apical reverse function with OTR instrumentation on the Tri Auto ZX2 motor

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

REBEC

Registry ID

RBR-7cgxzzb

Enrollment

Registered

2026-07-21

Start date

2025-05-06

Completion date

Unknown

Last updated

2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Traitement de canal radiculaire Endodontics

Interventions

This is a two-arm randomized controlled clinical trial without blinding. Experimental group 1: fifteen mandibular premolars from patients scheduled for extraction for periodontal or orthodontic reason

Eligibility

Age

18 Years to No maximum

Inclusion criteria

Inclusion criteria: Adult patients (over 18 years of age) indicated for extraction of mandibular premolars for orthodontic or periodontal reasons; Permanent single-rooted teeth with complete root formation; Presence of vital pulp; Absence of periapical lesions on clinical and radiographic examination; A single, patent root canal; Teeth indicated for endodontic treatment prior to extraction; Signed Informed Consent Form (ICF)

Exclusion criteria

Exclusion criteria: Teeth with previous endodontic treatment; Teeth with incomplete root formation; Presence of radiographically visible periapical lesions; Internal or external root resorption; Calcification or obliteration of the root canal preventing instrumentation; Crown or root fractures; Presence of more than one root canal or root canal anatomy incompatible with the study criteria; Inability to establish an adequate working length; Patients who declined to participate in the study or withdrew their informed consent during the study

Design outcomes

Primary

Measure	Time frame
Expected outcome 1: To evaluate the accuracy of working length control with the Tri Auto ZX2 endodontic motor using Optimum Torque Reverse (OTR) motion with the Automatic Apical Reverse (AAR) function programmed to the 0.5 and Zero positions, based on the difference between the working length (WL) and the actual tooth length after preparation (ATL2).;Outcome: A statistically significant difference was observed in the accuracy of working length control between the AAR 0.5 and AAR Zero settings (P = 0.005). The AAR Zero group showed a smaller mean difference between the working length and the actual tooth length after preparation (WL-ATL2), indicating greater accuracy compared to the AAR 0.5 group.	—

Measure

Time frame

Expected outcome 1: To evaluate the accuracy of working length control with the Tri Auto ZX2 endodontic motor using Optimum Torque Reverse (OTR) motion with the Automatic Apical Reverse (AAR) function programmed to the 0.5 and Zero positions, based on the difference between the working length (WL) and the actual tooth length after preparation (ATL2).;Outcome: A statistically significant difference was observed in the accuracy of working length control between the AAR 0.5 and AAR Zero settings (P = 0.005). The AAR Zero group showed a smaller mean difference between the working length and the actual tooth length after preparation (WL-ATL2), indicating greater accuracy compared to the AAR 0.5 group.

—

Secondary

Measure	Time frame
No secondary outcomes are expected.	—

Countries

Contacts

Public ContactKarine Pereira

Pontifícia Universidade católica do Paraná

odonto@pucpr.br+55 (41) 3271-1515

Outcome results

None listed

Source: REBEC (via WHO ICTRP) · Data processed: Aug 10, 2026