Three-dimensional evaluation and comparative analysis of dynamic facial soft tissue changes following treatment with the van Beek Headgear-Activator and Twin-Block appliances in growing patients with skeletal Class II malocclusion, aimed at correcting mandibular underdevelopment during growth and development. Functional orthodontic appliances, dynamic facial soft tissue, van Beek Headgear-Activator, Twin-block, Class II div 1 malocclusion, Three-dimensional dynamic facial imaging system (3dMD).
Conditions
Interventions
The Van Beek headgear activator design, consisted of a modified activator fitted with the extraoral arch and high pull headgear tubes incorporated into the maxillary acrylic. The intraoral activator p
Active Comparator Device,Active Comparator Device
van Beek Headgear-Activator (vBHGA) appliance,Twin-block (TB) appliance
Sponsors
Xi'an jiaotong university
Eligibility
Sex/Gender
All
Age
8 Years to 12 Years
Inclusion criteria
Inclusion criteria: 1 Healthy Chinese children aged between 8 and 12 years, Prepubertal skeletal maturation CVM stages between cervical Stage 2 and cervical Stage 3 2 Skeletal Class II division 1 malocclusion (ANB more than 4) and retrognathic mandible (SNB smaller than 78) with convex profile 3 an overjet greater than 5 mm 4 normal or protruded maxilla 5 an improvement in facial profile when the lower jaw was postured in a forward position 6 No previous history of orthodontic therapy 7 No history or clinically diagnosed TMJ disorders
Exclusion criteria
Exclusion criteria: 1 history of craniofacial anomalies and temporomandibular joint diseases. 2 post-pubertal growth period. 3 history of orthognathic treatment, orthodontic treatment, or surgery of the temporomandibular joint. 4 psychosocial impairment. 5 presence of severe systemic diseases or tumors. 6 Congenitally missing or extracted permanent teeth.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| 3D landmark movements will be evaluated and compared before and after therapy in four facial expression sequences (smile lips closed, smile lips open, lip purse, and cheek puff ) For the both groups 3D landmark movements will be recorded at the beginning (T0) , after 3 month of treatment (T1), and at the end of the functional appliance therapy(T2). A sequence frame for four facial expressions will be used; the RMS values for the rest state will be defined as the initial frame, the maximum motion state frame, and the end of motion frame | — |
Secondary
| Measure | Time frame |
|---|---|
| Comparison of 3D landmark movements between the two study groups in four facial expression sequences (smile lips closed, smile lips open, lip purse, and cheek puff ) Only 2 time points (T0 and T2): before treatment (T0) and at the end of the functional appliance therapy (T2) A sequence frame for four facial expressions will be used; the RMS values for the rest frame, the maximum motion frame, and end of motion frame between the two study groups | — |
Countries
China
Contacts
Public ContactLINA ALSHOAIBI
Xian jiaotong University
Outcome results
None listed