3D Comparison of Anterior Teeth Retraction and Anchorage Control Between En-masse and Two-step Mechanics: A Randomized Prospective Clinical Trial
Overview
- Phase
- Not Applicable
- Intervention
- Not specified
- Conditions
- Malocclusion, Angle Class I
- Sponsor
- Rio de Janeiro State University
- Enrollment
- 32
- Locations
- 1
- Primary Endpoint
- Anchorage loss
- Last Updated
- 7 years ago
Overview
Brief 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.
Investigators
Sergio Roberto de Oliveira Caetano
Masters in Orthodontics, PhD Student
Rio de Janeiro State University
Eligibility Criteria
Inclusion Criteria
- •Angle Class I malocclusion;
- •Bimaxillary protrusion;
- •Convex profile;
- •All natural teeth present in the mouth;
- •Absence of crowding or with negative discrepancy up to 4mm;
- •Absence of vertical and transverse occlusal problems;
- •Good oral health;
- •Good general health.
Exclusion Criteria
- •Lack of time to attend consultations;
- •Patients with severe systemic and psychological illness;
- •Patients with parafunction (bruxism), reflux or eating disorders;
- •Presence of periodontal disease;
Outcomes
Primary Outcomes
Anchorage loss
Time Frame: 12 months
Quantitative assessment of posterior anchorage loss between the two groups as measured by tomographic superimposition at the end of space closure.
Anterior teeth retraction
Time Frame: 12 months
Quantitative assessment of anterior teeth retraction between the two groups as measured by tomographic superimposition at the end of space closure.
Secondary Outcomes
- Molar inclination(12 months)
- Canine inclination(12 months)
- Incisors inclination(12 months)