Evaluation of Incisors' Position Following Anterior Segment Retraction

Not Applicable

Completed

• Conditions: Bimaxillary Protrusion
• Interventions: Other: Power chain used for anterior segment retraction; Other: T-loop fabricated to perform anterior segment retraction

• Registration Number: NCT04878939
• Lead Sponsor: Future University in Egypt

Brief Summary

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

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.

Study Timeline

• Study Start: 2019-02-04
• Primary Completion: 2020-09-01
• Study Completion: 2020-12-13
• Study First Submitted: 2021-04-25
• Status Verified: 2021-05
• Study First Submitted QC: 2021-05-05
• Last Update Submitted: 2021-05-05
• Study First Posted: 2021-05-10
• Last Update Posted: 2021-05-10

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Female
• Target Recruitment: 30

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

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Anterior segment retraction using sliding mechanics (friction)	Power chain used for anterior segment retraction	Power chain
Anterior segment retraction using segmental mechanics (frictionless)	T-loop fabricated to perform anterior segment retraction	T-loop

Primary Outcome Measures

Name	Time	Method
Torque of the incisors	through study completion (Pre/post retraction), an average of 6 months	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
Tip of the incisors	through study completion (Pre/post retraction), an average of 6 months	The change of the angle between the long axis of the incisors and mid-sagittal plane on CBCT pre and post retracation
Vertical changes of the incisors	through study completion (Pre/post retraction) , an average of 6 months	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

Secondary Outcome Measures

Name	Time	Method
Root resorption of the anterior teeth	through study completion (Pre/post retraction), an average of 6 months	measuring the amount of resorption using CBCT in mm pre and post retraction

Trial Locations

Locations (1)

Future University in Egypt; 🇪🇬 Cairo, Egypt