skeletal class ? mandibular retraction
Conditions
Interventions
TB group:Twin-Block appliance
S8-0 group:S8-SGTB appliance
S8-1 group:S8-SGTB appliance
Sponsors
Affiliated stomatology hospital of Guangxi Medical University
Eligibility
Sex/Gender
All
Inclusion criteria
Inclusion criteria: 1. The cervical spine maturity (CVM) was evaluated by lateral cephalometric radiographs to confirm the CS2-CS3 stage; 2. The overjet is 6 to 7 mm with an Angle Class II molar relationship; 3. SNB angle < 75°, and ANB angle < 4°; 4. Mandibular plane angle < 28°; 5. The crowding of the lower anterior arches are < 4 mm; 6. No orthodontic treatment, no orthognathic treatment, no maxillofacial trauma, no cleft lip and palate and other facial congenital malformation, no Supernumerary teeth, no congenital absence of teeth.
Exclusion criteria
Exclusion criteria: 1. Someone who can not cooperate the orthodontic treatment; 2. Periodontal disease, the obvious tooth root absorption; 3. Temporomandibular joint disease; 4. System disease such as diabetes, hyperthyroidism, the blood disease and so on.
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| Treatment time;Labial alveolar bone height(LABH);Lingual alveolar bone height(LIABH);Labial alveolar bone thickness(LABT);Lingual alveolar bone thickness(LIABT);Total alveolar bone thickness(TABT); Labial surrounding alveolar bone volume(LV);Lingual surrounding alveolar bone volume(LIV);Total surrounding alveolar bone volume;Distance of crown movement;Distance of root movement;Angle of Long axis;Length of mandibular ramus(Co-Go);Length of mandibular body(Go-Pog);The total length of the mandible(Co-Pog); | — |
Secondary
| Measure | Time frame |
|---|---|
| Tooth length; | — |
Countries
China
Contacts
Public ContactZheng Yi
Affiliated stomatology hospital of Guangxi Medical University
Outcome results
None listed