An interventional study of Power chain and Crimpable hook for En-Masse Retraction and T- Loop in Bimaxillary Protrusion, sponsored by Future University in Egypt. Completed at 1 site in Egypt. Open to participants aged 14 Years to 24 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2022-12-07.
Sponsored by Future University in Egypt · Not applicable, Interventional, and Treatment
There's a scarcity in literature concerning en-masse retraction and its effect on the rate of tooth movement. The purpose of this study is to determine, In orthodontic patients with maxillary protrusion, which form of mechanics in en-masse retraction offers a faster rate of retraction; Friction or Frictionless Mechanics.
The en-masse technique can be done in one of two ways: through friction or frictionless mechanics. Both are viable options, but, ideally, we want to retract and complete the orthodontic treatment as quickly as possible, in order to decrease the negative effects that may occur during treatment. Which of these mechanics results in a decreased treatment time is still up for debate.
Future University in Egypt is the lead sponsor of 97 studies on the registry; 26 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
6 anterior teeth (en-Masse) retracted using a crimpable hook distal to the upper lateral incisor and a power chain
Procedure: Power chain and Crimpable hook for En-Masse Retraction
6 anterior teeth (en-Masse) retracted using a T- loop
Procedure: T- Loop
Retraction will start on a 0.017"x0.025" Stainless steel wire using elastomeric chain (force applied will be 212 g per side) extending between the crimpable hooks and the miniscrew
Closing retraction T-loops will be fabricated using 0.017 x 0.025 TMA wire. The loop will be positioned halfway the extraction space and the canine
Retraction Rate
The antero-posterior movement of anterior teeth and first molars will be assessed by measuring the digitilized study models taken of the patients monthly (measured in mm)
Time frame: From pre to post retraction (an average of 6 - 8 months)
Anchorage Loss
Digitilized dental models taken before and after the completion of retraction will be measured by identifying landmarks and reference lines and planes (measured in mm)
Time frame: From pre to post retraction (an average of 6 - 8 months)
Molar Rotation
Study models that are taken pre and post retraction (then digitilized) will be used to assess the rotation of the maxillary first molars in relation to a reference line (measurement of the angles in degrees)
Time frame: From pre to post retraction (an average of 6 - 8 months)
Pain of intervention
Each patient will fill a questionnaire regarding his treatment experience in a VAS scoring from 1-10
Time frame: From pre to post retraction/intervention (an average of 6 - 8 months)
Anterior teeth torque, extrusion/intrusion
The principle investigator will examine pre and post lateral cephalometric radiographs in relation to lines and reference planes (measurements in degrees and mm)
Time frame: From pre to post retraction (an average of 6 - 8 months)
Documents are hosted by the registry — open the source record to download them.
Plan to share: Yes — All collected IPD
Supporting information: Study protocol, Sap, Icf
This study is completed, as verified in Dec 2022. You cannot join it, but the record below documents what was studied.
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Future University in Egypt