Malocclusion, Angle Class II
Conditions
Keywords
Carriere motion appliance, Distalization, Skeletal anchorage, Infrazygomatic miniscrews
Brief summary
Carriere Motion appliance (CMA) was designed to change a Class II molar relationship into a Class I relationship by distalizing the whole posterior maxillary segment by means of class II elastics and mandibular anchorage. To eliminate the adverse effects of CMA with class II elastics, we can use the CMA to distalize the maxillary posterior segment with intra-arch anchorage using infrazygomatic miniscrews. The aim of this study is to evaluate skeletaly anchored CMA for distalization of the maxillary buccal segment vs. conventionally anchored CMA by comparing skeletal and dental measurements obtained from lateral cephalometric radiographs obtained prior to treatment (T0) and immediately after correction of class II and remval of the appliance (T1).
Detailed description
Thirty-two class II malocclusion patients with age (11-16) years will be randomly allocated in the two groups: 1. Conventional anchorage CMA group (CAG): conventional mandibular anchorage using Essix retainer. 2. Skeletal anchorage CMA group (SAG): anchorage by infra-zygomatic miniscrews. In the CAG, Class II elastics will be attached from the maxillary canine to the mandibular first molar bilaterally with Essix retainer in the lower arch as anchorage means. In the SAG, closing coil spring will be attached from the maxillary canine to the infrazygomatic miniscrews bilaterally. For each patient, two lateral cephalograms will be obtained: one preoperatively and another after completion of distalization. Model measurements will be made using the attached 3Shape computer software.
Interventions
The CMA will be bonded on the permanent maxillary canine and first molar, and the correct size is chosen according to the manufacturer's instructions.
Sponsors
Mansoura University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)
Masking description
data will be sent blinded for statistical analysis
Intervention model description
Subjects will be randomly allocated into two groups: 1. Conventional anchorage CMA group (CAG): conventional mandibular anchorage using Essix retainer. 2. Skeletal anchorage CMA group (SAG): anchorage by infra-zygomatic mini-screws. In the CAG, Class II elastics will be attached from the maxillary canine to the mandibular first molar bilaterally with Essix retainer in the lower arch as anchorage means. In the SAG, the closing coil spring will be attached from the maxillary canine to the infra zygomatic miniscrews bilaterally. For each patient, two lateral cephalograms will be obtained: one preoperatively and another after completion of distalization. Model measurements will be made using the attached 3Shape computer software.
Eligibility
Sex/Gender
ALL
Age
11 Years to 16 Years
Healthy volunteers
Yes
Inclusion criteria
1. Patients age (11-16) years. 2. Full permanent dentition. 3. Class II malocclusion with at least an end-on Class II molar relationship bilaterally.
Exclusion criteria
1. Systemic conditions that may interfere with the treatment. 2. Bad habits that might jeopardize the appliance. 3. Transverse discrepancy. 4. Previous orthodontic treatment.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Treatment duration | from date of appliance delivery to date of removal after reaching class I molar relationship (about 4-6 months) | months |
| Skeletal changes | from date of appliance delivery to date of removal after reaching class I molar relationship (about 4-6 months) | degrees |
| Dental changes | from date of appliance delivery to date of removal after reaching class I molar relationship (about 4-6 months) | degrees |
Countries
Egypt
Outcome results
None listed