Class II Malocclusion, Division 1
Conditions
Keywords
Class II malocclusion., prepubertal patients., postpubertal patients., Herbst appliance.
Brief summary
The study was directed to compare the treatment outcomes of subjects with Class II malocclusion who were treated with Herbst appliance before and after puberty.
Detailed description
Thirty-six Class II patients were randomly selected and divided into two groups based on their stage of skeletal maturation: pre-pubertal group (18 patients, mean age 9.15± 1.5 years) and post-pubertal group (18 patients, mean age 16.3 ± 1.0 years). All patients were treated with metallic splint supported Herbst IV appliance. Pretreatment and post-Herbst IV treatment cone beam CT(CBCT) scans were obtained for both groups. Dentoskeletal and TMJ measurements made on the CBCT scans were analysed.
Interventions
DEVICEHerbst appliance
The bottom line of the study is to investigate the changes after Herbst appliance treatment and relate it to the pubertal status of the skeletal class II patients using CBCT.
Sponsors
Al-Azhar University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
8 Years to 17 Years
Healthy volunteers
Yes
Inclusion criteria
1. Skeletal Class II malocclusion with retrognathic mandible (ANB \>5°, SNB\<76°) 2. Normal growth pattern (SN/MP angle was in 25°- 35° range) 3. Unilateral or bilateral Class II molar relationship greater than or equal to one-half a cusp width. 4. Minimal or no crowding in the mandibular arch (0-5mm). 5. Average inclination or slight retroclination of the lower incisor. 6. An overjet greater than 5 mm.
Exclusion criteria
1. Skletal Class I 2. Craniofacial syndrome.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Skeletal and dental changes | 8 months | The DICOM (Digital Imaging and Communications in Medicine) files from the pre and post CBCT scans were imported to Mimics software (Version 10.1, Materialise NV, Leuven, Belgium); and the cephalometric landmarks and planes were defined . Linear sagittal measurements of point A, point B, glenoid fossa, upper incisor, lower incisor, upper molars, and lower molars were recorded in relation to orbital perpendicular plane. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Condylar head position | 8 months | The Most middle-superior point of the mandibular condyle was determined in sagittal, axial and coronal views. In the sagittal slice of the middle condylar head, a line was drowned through the widest measurement of the condylar heads visible on the slice, from this line, three lines were raised crossing the glenoid fossa at 45°, 90°, and 135° . Four linear measurements representing the anterosuperior, superior, posterosuperior, and posterior distance were taken from the glenoid fossa wall to the surface of the condyle |
Countries
Egypt
Outcome results
None listed