Temporomandibular joint changes after activator appliance therapy: a prospective magnetic resonance imaging study.
J Craniofac Surg
; 24(4): 1184-9, 2013 Jul.
Article
en En
| MEDLINE
| ID: mdl-23851766
ABSTRACT
The aim of this prospective clinical and magnetic resonance imaging study was to analyze the effect of 1-year Activator (Yi-fan Dental Co., Shanghai, China) treatment in internal anatomical relationships of the temporomandibular joint (TMJ) complex, including the condyle-disc relationship, condyle-fossa relationship, condylar height change, disc length change, and morphologic change of the glenoid fossa. The study was composed of patients with class II division 1 malocclusion (11 girls and 13 boys) who underwent 1-year Activator treatment. All the patients were in the acceleration or peak phase of the pubertal growth spurt. Magnetic resonance imaging in closed-mouth position and lateral cephalometric radiographs before and after 1 year of Activator treatment were analyzed metrically. Overall, condylar height showed a significant increase (P < 0.001), and the eminence angle decreased (P = 0.037). TMJ disc length has no statistically significant change before and after treatment. A slight advancement (P = 0.041) was found in the sagittal condylar position. A significant backward movement (P = 0.04) was shown in the sagittal disc position. Our results showed that the disc is not impaired by Activator therapy; it seems possible that adaptive remodeling, including a shallower glenoid fossa and increased condylar height, was seen after treatment.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Articulación Temporomandibular
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Aparatos Activadores
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Maloclusión Clase II de Angle
Tipo de estudio:
Observational_studies
Límite:
Adolescent
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Child
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Female
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Humans
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Male
Idioma:
En
Revista:
J Craniofac Surg
Asunto de la revista:
ODONTOLOGIA
Año:
2013
Tipo del documento:
Article