Class II malocclusion
Conditions
Interventions
Group A:First, wear the Rapid Maxillary Expander (RME). The expander should be activated by a doctor or a guiding parent using a special key at a set rate (usually 1/4 turn per day) for about 2 to 3 w
Group B:Wear a standard Twinblock function orthodontic appliance. This orthodontic appliance consists of two independent bases for the upper and lower jaws and guiding inclined surfaces. Through the i
Sponsors
Shanghai General Hospital
Eligibility
Sex/Gender
All
Age
10 Years to 13 Years
Inclusion criteria
Inclusion criteria: 1.The patient's age is 10 to 13 years old, with no gender restrictions. The cervical spine X-ray shows that before treatment, it was CV1 to CV3 (Figure 1), that is, before or during the peak period of growth and development. 2. It is classified as AngleII Class 1 malocclusion. Patients present with mandibular retraction, normal or slightly protruding maxilla, and narrowed maxillary dental arch. 3.ANB>=4 °; 4. Distal molar relationship, distal molar relationship, with the mandible receding by at least half a distance of the premolars, and anterior tooth coverage >=4mm; 5. Good oral condition (healthy periodontal tissues, no periapical infection or unfilled caries).
Exclusion criteria
Exclusion criteria: 1. Exclude those with a history of temporomandibular joint diseases, systemic diseases, systemic metabolic diseases, and medication history. Also, exclude those engaged in laser or radiation work. 2. Rule out conditions such as bone islands, bone tumors, apical cysts, root resorption, and root exposure in the area of tooth movement; 3. Exclude periodontitis patients with periodontal attachment loss and alveolar bone resorption greater than 10%; 4. Exclude those with a 2mm gum recession; 5. Exclude those with mental disorders or movement disorders; 6. Exclude those with abnormal bone metabolism (including those taking bone resorption drugs, hormone drugs, and immunosuppressants).
Design outcomes
Primary
| Measure | Time frame |
|---|---|
| The changes in the ANB Angle measured at the head shadow before and after treatment; | — |
Countries
China
Contacts
Public ContactLi Wang
Shanghai General Hospital
Outcome results
None listed