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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
SINGLE
Enrollment
30
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 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.
Future University in Egypt
Cairo, Egypt
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
Time frame: 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
Time frame: 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
Time frame: through study completion (Pre/post retraction) , an average of 6 months
Root resorption of the anterior teeth
measuring the amount of resorption using CBCT in mm pre and post retraction
Time frame: through study completion (Pre/post retraction), an average of 6 months
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