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

ConditionExternal Apical Root Resorption in Maxillary Canines During Orthodontic Retraction
Trial statusNot yet recruiting
Trial phaseNot applicable
Trial typeInterventional
Biological sexAll
Age12-30
SponsorIslamabad Medical and Dental College

About this trial

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.

Eligibility criteria

This trial accepts healthy volunteers

Qualifiers

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

Disqualifiers

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

Trial design

Design model

Parallel

Treatments tested in this trial

  • Modified Corticotomy assisted frictionless canine retraction

    Procedure/Surgery

    A surgical procedure in which a buccal flap is elevated and two vertical corticotomy cuts are made in the maxillary cortical bone adjacent to the extraction site to accelerate orthodontic tooth movement.

  • Conventional Frictionless Canine retraction

    Procedure/Surgery

    Orthodontic space closure using 17×25 TMA T-loops activated to deliver approximately 200 g of force for frictionless canine retraction into maxillary first premolar extraction spaces.

Treatment groups

60 Participants
are divided into 2 treatment groups
Group A: Modified Corticotomy Assisted Canine RetractionExperimental treatment 1 intervention
Group B: Conventional T-loop Canine RetractionActive comparator 1 intervention

Trial outcomes

Primary outcomes

1

Mean Loss of Canine Root Length (mm)

External apical root resorption measured as the difference in root length (in millimeters) from canine cusp tip to root apex on calibrated pre-treatment and post-retraction OPG radiographs using ViewBox software.

Time frame
- Before retraction (baseline) - From baseline to completion of canine retraction (approximately 4-6 months)

Secondary outcomes

1

Change in Root Width at Mesial and Distal Apex (mm)

Difference in mesial and distal root width measured 1 mm short of the root apex on calibrated OPG radiographs before and after canine retraction.

Time frame
From baseline to completion of canine retraction (approximately 4-6 months)

Other outcomes

1

Degree of External Apical Root Resorption According to Sharpe Classification

SHARPE ET AL. CLASSIFICATION OF EXTERNAL ROOT RESORPTION 0 = No apical root resorption 1. Slight blunting of the root apex 2. Moderate resorption of root apex beyond blunting and up to one-third of root length. 3. Excessive (severe) resorption of the root apex beyond one-third of the root length.

Time frame
At completion of canine retraction (approximately 4-6 months)

Sponsors and contacts

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Islamabad Medical and Dental College

Lead sponsor

Source ClinicalTrials.gov

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