En-masse Retraction , Class I Bimaxillary Protrusion Clinical Trial
Official title:
Friction Versus Frictionless Mechanics During Maxillary En-masse Retraction in Adult Patients With Class I Bimaxillary Dentoalveolar Protrusion: A Randomized Clinical Trial
This study is a Randomized clinical trial comparing the effectiveness of two different mechanics during maxillary en-masse retraction in adult patients. Patients will be randomly divided into two groups:Friction and frictionless mechanics. Mini screws will be used in both group to ensure maximum anchorage during retraction. Lateral cephalometric radiographs and dental models will be taken for each patients pre and post -retraction. Following complete anterior segment retraction, the rate and duration of retraction will be evaluated for both groups as well as patient satisfaction with treatment. Changes in incisors inclination and soft tissue as well as anchorage loss will be also assessed.
Adult patients with Class I bimaxillary dentoalveolar protrusion will be recruited. All the
patients need extraction of upper first premolars followed by anterior segment retraction and
maximum anchorage.
The patients will be randomly allocated to one of two groups; either Friction or Frictionless
group. In friction group, Nickel Titanium coil spring will be used for retraction of anterior
segment while in frictionless group, T-loops will be used for retraction. All the patients
will receive two miniscrews , one on each side to achieve maximum anchorage during
retraction.
The patients will be seen on a monthly basis for follow up visit for activation of the
appliance to maintain constant force during the study. An impression will be taken for the
patients every visit, poured into stone for fabrication of dental models. The models will be
used to monitor the rate of retraction of anterior teeth.
Every patient will be asked for lateral cephalometric radiograph before and after complete
retraction. After data collection, two assessors will carry on the measurements blindly and
independently. Statistical analysis of the data will be done and the results will be compared
to evaluate the effectiveness of both techniques for en-masse retraction.
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