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3D Comparison of Anterior Teeth Retraction and Anchorage Control Between En-masse and Two-step Mechanics

NCT03903575 · Status: UNKNOWN · Phase: NA · Type: INTERVENTIONAL · Enrollment: 32

Last updated 2019-04-05

No results posted yet for this study

Summary

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.

Conditions

  • Malocclusion, Angle Class I
  • Bimaxillary Protrusion
  • Orthodontic Space Closure

Interventions

PROCEDURE

En masse anterior teeth retraction

After extraction of the four premolars the posterior teeth will be tied-together and the six anterior teeth will be retracted by sliding mechanics.

PROCEDURE

Two-Step Retraction

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.

Sponsors & Collaborators

  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior.

    collaborator OTHER_GOV

  • Rio de Janeiro State University

    lead OTHER

Principal Investigators

  • Sergio Caetano, MSc · Rio de Janeiro State University

  • Flavia Artese, PhD · Rio de Janeiro State University

  • Jose Augusto M Miguel, PhD · Rio de Janeiro State University

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
40 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2019-04-03
Primary Completion
2020-04-30
Completion
2020-12-31

Countries

  • Brazil

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03903575 on ClinicalTrials.gov