The aim of this study is to compare to different protocols to treat Class II malocclusion in growing subjects using the twin block appliance
* Patients will be clinically and radio-graphically examined for eligibility * Eligible patients will be randomly assigned to one of two groups: * Control Group: Twin Block Appliance fabricated to Maximum Bite Advancement group * Intervention Group: Twin Block Appliance fabricated for Incremental Bite Advancement group * Records will be taken and impressions will be made and poured. In the control group, bite registration will be made with maximum mandibular advancement. In the intervention group, bite registration is made to habitual bite to make a modified twin block. * Patients will be recalled every 6 weeks for 8 months for monitoring and reactivation of the appliance.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
24
a modified twin block design including jack screws to facilitate incemental advancement
a traditional twin block set to maximum bite advancement at start of treatment
Faculty of Dentistry, Cairo University
Cairo, Egypt
To asses Skeletal and dentoalveolar changes in Mandible
Cone Beam CT will be taken before and after active treatment, 3D Cephalometric analysis will be conducted on the Cone Beam to asses Skeletal and Dentoalvoelar changes in mandible. \- changes that will be assesed include ( mandibular base length / mandibular antero posterior position in relation to cranial base/ Condylar position / lower incisor inclination to mandibular plane)
Time frame: 8 Months
To asses patient compliance
patient will answer a questionnaire at end of treatment
Time frame: 8 months
To asses Skeletal and dentoalveolar changes in Maxilla
* Cone Beam CT will be taken before and after active treatment, 3D Cephalometric analysis will be conducted on the Cone Beam to asses Skeletal and Dentoalvoelar changes in maxilla * Changes that will be assesed include ( maxillary base length / maxillary base antero posterior position in relation to cranial base / incisor inclination to palatial plane)
Time frame: 8 months
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