The Effectiveness of Double-slot Brackets Versus Single-slot Brackets on the Rate of Canine Retraction

The Effectiveness of Double-slot Brackets Versus Single-slot Brackets on the Rate of Canine Retraction: A Randomized Clinical Trial

The aim of this Randomized clinical trial is to compare the efficacy of the double slot brackets compared to single slot-brackets in producing a controlled rate of upper canine retraction into premolar extraction space.

patients will be randomly divided into one of the two groups, CBCT (cone beam computed tomography) and dental models will be taken for each patient Pre-retraction and following the study completion.

The rate of retraction will be evaluated for both groups as well as Amount of canine root movement and molar anchorage loss will be also assessed.

Study Overview

• Status: Completed
• Conditions: Rate of Canine Retraction
• Intervention / Treatment: Device: Single-slot brackets; Device: Double-slot brackets

Detailed Description

Eligible patients will be examined for fulfilling the inclusion criteria. All the recruited patients need extraction of upper first premolars followed by canine retraction with maximum anchorage.

The patients will be randomly allocated to one of the two groups; either Double slot brackets or single slot-brackets group.

In Double slot bracket group, Canine retraction will be made on two 0.016'' StSt (stainless steel) round wires, each in one of the slots of the double slot brackets. while in single slot-bracket group, Retraction will be made on one 0.017''×0.025'' rectangular StSt arch wire .

The patients will be seen on a monthly basis for follow up visit for reactivation of retraction to maintain constant force during the study. An impression will be taken for the patients every visit, fabricated dental models will be digitally scanned. The scanned models will be used to monitor the rate of canine retraction.

Every patient will be asked to take a CBCT image of the upper arch pre Retraction and after the completion of study duration (3 months). After data collection, assessors will carry on the measurements blindly. Statistical analysis of the data will be done and the results will be compared to evaluate the effectiveness of both techniques for canine retraction.

• Study Type: Interventional
• Enrollment (Actual): 30
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Egypt
  • Giza, Egypt, 12613
    • Cairo University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child; Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Good oral hygiene.
• Adult Male or Female patients with an age range of 16-26 years old.
• Full set of permanent dentition(excluding third molar).
• Any kind of malocclusion requiring first premolar extraction and canine retraction.
• Patients with type/pattern of crowding that allows leveling and alignment before premolar extraction

Exclusion Criteria:

• History of previous orthodontic treatment.
• Craniofacial deformity.
• Systematic disease or administrating drugs affecting tooth movement.
• Poor oral health.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Single

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Single-slot brackets; Bonding of the upper arch up to second molars with Roth prescription 0.022x.028" single slot brackets (MINI MS-American orthodontics)	Device: Single-slot brackets; Miniscrews will be inserted in the buccal alveolar bone between first and second molars bilaterally and ligated to second premolar. Canine Retraction using Nickel titanium closed-coil springs delivering a force of 150 gram, extending the spring between the canine and first molar hooks. retraction on single 0.017x0.022'' Stainless steel wire. Re-activation of the coil spring will be done in the follow up visits to maintain a constant force through the study.
Experimental: Double-slot brackets; Double slot brackets (SORTECH-South Orthodontic Technology) will be Bonded on the upper arch up to the second molars. The brackets are of Roth prescription & have two slots, cervical 0.018x.025" slot and incisal/occlusal 0.022x.028" slot	Device: Double-slot brackets; Miniscrews will be inserted in the buccal alveolar bone between first and second molars bilaterally and ligated to second premolar. Canine Retraction using Nickel titanium closed-coil springs delivering a force of 150 gram, extending the spring between the canine and first molar hooks. retraction on double 0.016'' Stainless steel round wires in both slots of the double slot brackets. Re-activation of the coil spring will be done in the follow up visits to maintain a constant force through the study.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
rate of canine retraction	millimeters through superimposed digital models taken for each patient monthly at the follow up visits.	3 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Molar cusp anchorage loss	millimeters through superimposed digital models taken for each patient monthly at the follow up visits. and pre and post retraction CBCT images	3 months
Amount of canine root movement	millimeters through pre and post retraction CBCT (cone beam computed tomography) images of the upper arch	3 months
Total distance moved by the maxillary canine tip	movement in millimeters through superimposed pre- and post-retraction digital models.	3 months
the change in Maxillary canine Torque	angular change through comparing pre- and post-retraction CBCT	3 months
change in maxillary canine tipping	angular change through comparing pre- and post-retraction CBCT	3 months
The changes in maxillary canine rotation	angular change through superimposed pre- and post-retraction digital models.	3 months
Amount of maxillary canine root resorption	millimeters through pre and post retraction CBCT (cone beam computed tomography) images of the upper arch	3 months

Collaborators and Investigators

• Sponsor: Cairo University
• Investigators: Study Chair: Amr R El Beialy, Assoc.Prof, Orthodontic department, Faculty of Dentistry, Cairo University; Study Director: Nada O El Zawahry, lecturer, Orthodontic department, Faculty of Dentistry, Cairo University; Study Director: Noha A El Ashmawi, lecturer, Orthodontic department, Faculty of Dentistry, Cairo University

Study record dates

Study Major Dates

• Study Start (Actual): October 19, 2024
• Primary Completion (Actual): January 26, 2025
• Study Completion (Actual): January 26, 2025

Study Registration Dates

• First Submitted: June 24, 2024
• First Submitted That Met QC Criteria: June 24, 2024
• First Posted (Actual): July 1, 2024

Study Record Updates

• Last Update Posted (Actual): June 26, 2026
• Last Update Submitted That Met QC Criteria: June 24, 2026
• Last Verified: June 1, 2026

More Information

Terms related to this study

• Keywords: Orthodontic tooth movement; canine retraction; double slot brackets
• Other Study ID Numbers: Orth3-3-2

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No