Evaluation of Incisors' Position Following Anterior Segment Retraction

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

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.

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