Assessment of asymmetry in a normal occlusion sample and asymmetric patients with three-dimensional cone beam computed tomography: a study for a transverse reference plane.
Angle Orthod
; 82(5): 860-7, 2012 Sep.
Article
en En
| MEDLINE
| ID: mdl-22356706
ABSTRACT
OBJECTIVE:
To characterize symmetrical features of patients with facial asymmetry and thus to find the most reliable horizontal reference lines easily used in three-dimensional images. The hypothesis was that there is a difference in the location of bilateral landmarks of the upper skull between the normal occlusion sample and skeletal Class III patients with asymmetry. MATERIALS ANDMETHODS:
Group 1 (normal occlusion sample) was composed of 20 Korean adults with normal occlusion and no noticeable asymmetry. Groups 2 through 4 were selected from patients who were diagnosed as skeletal Class III malocclusion and grouped according to the extent of asymmetry (group 2 symmetric mandible, no maxillary cant; group 3 asymmetric mandible, no maxillary cant; group 4 asymmetric mandible, more than 4 mm maxillary cant measured at maxillary first molars). Three-dimensional cone beam computed tomography images were taken before treatment, and bilateral landmarks of the skull were located and their vertical and horizontal differences compared.RESULTS:
No statistically significant difference was noted in the position of bilateral landmarks between groups, except for AG (P < .05). AG showed significant differences in vertical dimension (P < .001) and in horizontal dimension (P < .0001) between groups. The mean of the difference was clearly greatest at FM.CONCLUSIONS:
The hypothesis is rejected. All groups had a similar pattern of asymmetry in the upper third of the face. Therefore, the transverse reference line of the bilateral Z or orbitale may be used even in patients with severe asymmetry of the maxilla with reference to the clinical photos.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Oclusión Dental
/
Asimetría Facial
/
Huesos Faciales
/
Tomografía Computarizada de Haz Cónico
/
Maloclusión de Angle Clase III
Límite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Angle Orthod
Año:
2012
Tipo del documento:
Article
País de afiliación:
Corea del Sur