Bimaxillary Protrusion
Conditions
Keywords
friction, frictionless, CBCT, anterior segment retraction, T loop
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.
Interventions
OTHERPower chain used for anterior segment retraction
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.
OTHERT-loop fabricated to perform anterior segment retraction
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.
Sponsors
Future University in Egypt
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
SINGLE (Outcomes Assessor)
Masking description
Blinding of the main investigator to the interventions was difficult, yet the outcome assessor was masked to the intervention and assessed unidentified CBCTs
Eligibility
Sex/Gender
FEMALE
Age
13 Years to 25 Years
Healthy volunteers
Yes
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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| 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
| Measure | Time frame | Description |
|---|---|---|
| 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 |
Countries
Egypt
Outcome results
None listed