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There's scarcity in literature concerning the issue of anterior segment retraction technique and its effect on anterior teeth position. Therefore, a randomized clinical trial has been chosen to investigate this issue, aiming to support clinicians with the best guidelines for anterior segment retraction.
Thirty females with bimaxillary protrusion were randomly allocated into two groups. In one group, anterior segment retraction was commenced using an elastomeric chain rendering 160 g/side extending between mini-screw implant and a hook crimped on 0.017- by 0.025-inch stainless steel wire distal to the lateral incisor. In the other group, anterior segment retraction was done using closing T-loops fabricated from 0.017- by 0.025-inch titanium molybdenum alloy (TMA) wire rendering comparable retraction force. Three-dimensional analysis of incisors' buccolingual (BL)- torque, mesiodistal (MD)- tip, vertical position changes and root resorption were assessed using cone beam computed tomography scans.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Anterior segment retraction using sliding mechanics (friction) | Experimental | Power chain |
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| Anterior segment retraction using segmental mechanics (frictionless) | Experimental | T-loop |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Power chain used for anterior segment retraction | Other | Elastomeric chain rendering 160 g/side extending between mini-screw implant and a hook crimped on 0.017- by 0.025-inch stainless steel wire distal to the lateral incisor. |
| Measure | Description | Time Frame |
|---|---|---|
| Torque of the incisors | The change of the outer angle between long axis of each upper anterior tooth and palatal plane on CBCT pre and post retracation and the change in the outer angle between long axis of each lower anterior tooth and horizontal plane on CBCT pre and post retracation | through study completion (Pre/post retraction), an average of 6 months |
| Tip of the incisors | The change of the angle between the long axis of the incisors and mid-sagittal plane on CBCT pre and post retracation | through study completion (Pre/post retraction), an average of 6 months |
| Vertical changes of the incisors | The change of the linear distance between the centroid of each maxillary anterior tooth and palatal Plane on CBCT pre and post retracation and The change of the linear distance between centroid of each mandibular anterior tooth and horizontal Plane on CBCT pre and post retracation | through study completion (Pre/post retraction) , an average of 6 months |
| Measure | Description | Time Frame |
|---|---|---|
| Root resorption of the anterior teeth | measuring the amount of resorption using CBCT in mm pre and post retraction | through study completion (Pre/post retraction), an average of 6 months |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Yehia Mostafa, Professor and Chairman | Future University in Egypt | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Future University in Egypt | Cairo | Egypt |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 39049618 | Derived | Bakhit DMI, Tawfik MGY, Dehis HM, Mostafa YA, El Sharaby FA. Position and root resorption of the incisors following anterior segment retraction using friction versus frictionless mechanics: A randomised controlled trial. J Orthod. 2025 Mar;52(1):12-21. doi: 10.1177/14653125241261402. Epub 2024 Jul 25. |
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All collected IPD
Data will be ready to share after publication
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| Type | Includes Protocol | Includes SAP | Includes ICF | Document Label | Document Date | Document Uploaded Date | Document File Name |
|---|---|---|---|---|---|---|---|
| Prot_SAP | Yes | Yes | No | Study Protocol and Statistical Analysis Plan | Jan 1, 2019 | May 5, 2021 | Prot_SAP_000.pdf |
| ICF | No | No | Yes | Informed Consent Form | Jan 1, 2019 | May 5, 2021 | ICF_001.pdf |
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Blinding of the main investigator to the interventions was difficult, yet the outcome assessor was masked to the intervention and assessed unidentified CBCTs
| T-loop fabricated to perform anterior segment retraction | Other | In the frictionless group, anterior segment retraction was done using closing T-loops fabricated from 0.017- by 0.025-inch titanium molybdenum alloy (TMA) wire rendering comparable retraction force. |
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