Comparison of Root Resorption in Modified Corticotomy-Assisted and Conventional Canine Retraction

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Conditions studied: External Apical Root Resorption in Maxillary Canines During Orthodontic Retraction

In brief

This randomized controlled clinical trial will compare external apical root resorption in patients undergoing maxillary canine retraction using modified corticotomy-assisted frictionless T-loop mechanics versus conventional frictionless T-loop mechanics. Sixty orthodontic patients requiring extraction of maxillary first premolars will be randomly assigned to two groups. Changes in canine root length will be measured on panoramic radiographs taken before and after retraction to determine the extent of external apical root resorption. The study will evaluate whether modified corticotomy-assisted retraction results in different root resorption outcomes compared to conventional retraction.

Key facts

Study ID: NCT07458139
Run by: Islamabad Medical and Dental College
People needed: 60
Starts: 2026-03-01
Expected to finish: 2026-07-01
Last updated by the study team: 2026-03-09

Who can join

Age: 12 and older, up to 30. Sex: any. Healthy volunteers: accepted.

You may qualify if…

Patients aged 12-30 years requiring canine retraction into maxillary first premolar extraction spaces
Patients with normal vertical skeletal pattern (mandibular plane angle 32° ± 5°)
Patients with healthy periodontium

You may not qualify if…

Syndromic patients
Patients with systemic conditions requiring long-term medication affecting orthodontic tooth movement (e.g., NSAIDs, bisphosphonates, anticonvulsants)
Mixed dentition cases
Patients with pre-existing root resorption
Patients who fail to attend scheduled appointments

Where it is running

Islamabad Dental Hospital — Islamabad, Federal, Pakistan

Full record on ClinicalTrials.gov

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