Evaluation of Incisors' Position Following Anterior Segment Retraction

Study Overview
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Brief Summary
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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.

Detailed Description
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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.

Official Title
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Evaluation of Incisors' Position Following Anterior Segment Retraction Using Friction Versus Frictionless Mechanics: A Randomized Clinical Trial

Conditions
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Bimaxillary Protrusion

Intervention / Treatment
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* Other: Power chain used for anterior segment retraction
* Other: T-loop fabricated to perform anterior segment retraction


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Female patients (Age 13- 25 y) Class I molar relation (Angle's classification) Bimaxillary protrusion requiring extraction of four first premolars and maximum anchorage. full permanent dentition (except 3rd molars) Good general and oral health Exclusion Criteria: Systemic disease or syndromes or on anti-inflammatory medication. Extracted or missing permanent teeth (other than 3rd molars) Badly decayed teeth (other than 1st premolars) Parafunctional habits History of previous orthodontics treatment

Ages Eligible for Study
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Minimum Age: 13 Years
Maximum Age: 25 Years

Sexes Eligible for Study
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Female

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Other
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Anterior segment retraction using sliding mechanics (friction)<br>Power chain | Other: Power chain used for anterior segment retraction<br>* 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.<br>|
| Experimental: Anterior segment retraction using segmental mechanics (frictionless)<br>T-loop | Other: T-loop fabricated to perform anterior segment retraction<br>* 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.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | 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 | 

Secondary Outcome Measures

| Outcome Measure | 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 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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friction, frictionless, CBCT, anterior segment retraction, T loop