The aim of this study is to compare en masse (EM) and two-step anterior teeth retraction (TSR) evaluated by means of three-dimensional images superimposition. Thirty-two adult patients with bimaxillary protrusion planed for treatment with four first premolar extractions will be enrolled. All patients will be randomly allocated in a 1:1 ratio to either EM (n=16) group or the TSR (n=16) group. Cone bean computed tomography will be taken before and after anterior retraction. A blind observer will construct separate 3D models for maxillary and mandibular surfaces using the anterior cranial fossa to register models of before and after space closing. Quantitative assessment of posterior anchorage loss and amount of anterior teeth retraction are the main outcomes. The secondary outcomes are the inclination of the molars, canines and incisors.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
32
After extraction of the four premolars the posterior teeth will be tied-together and the six anterior teeth will be retracted by sliding mechanics.
After extraction of the four premolars the posterior teeth will be tied-together and the canines will be retracted by sliding mechanics. After the distalization of the canines they will be tied to the posterior teeth and the incisors will be retracted by sliding mechanics.
Faculdade de Odontologia - UERJ
Rio de Janeiro, Brazil
RECRUITINGAnchorage loss
Quantitative assessment of posterior anchorage loss between the two groups as measured by tomographic superimposition at the end of space closure.
Time frame: 12 months
Anterior teeth retraction
Quantitative assessment of anterior teeth retraction between the two groups as measured by tomographic superimposition at the end of space closure.
Time frame: 12 months
Molar inclination
Quantitative assessment of molars inclination between the two groups as measured by tomographic superimposition at the end of space closure.
Time frame: 12 months
Canine inclination
Quantitative assessment of canines inclination between the two groups as measured by tomographic superimposition at the end of space closure.
Time frame: 12 months
Incisors inclination
Quantitative assessment of incisors inclination between the two groups as measured by tomographic superimposition at the end of space closure.
Time frame: 12 months
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