Facial profile changes in early Class II correction with cervical headgear.
Angle Orthod
; 77(6): 960-7, 2007 Nov.
Article
en En
| MEDLINE
| ID: mdl-18004917
ABSTRACT
OBJECTIVE:
To characterize the effects of early cervical headgear treatment on the facial profile of children in Class II division 1 malocclusion. MATERIALS ANDMETHODS:
Forty children aged 9.1 (7.2-11.5) years with Class II division 1 malocclusion were treated using a cervical headgear appliance. The headgear consisted of a long outer bow bent upward 15 degrees and a large expanded inner bow. Lateral cephalograms were taken before and after treatment, and the facial profile was estimated from the cephalograms. The results were compared to an age- and sex-matched normal cohort of 644 Finnish children.RESULTS:
Class I molar relationship was achieved in all treated children. The treatment time was 1.6 (0.3-3.1) years on average. Compared to the controls, the treatment restricted the forward growth of maxillary A-point, and the SNA angle decreased 1.4 degrees +/- 1.2 degrees per year (P < .00001). Decreased maxillary prognathism was associated with decreased facial convexity, g-sn-pg (P = .02), and the ANB (P < .00001) angles decreased compared to the controls. Upper lip protrusion (distance ls to sn-pg; P < .00001) was decreased, and the nasolabial angle (cm-sn-ls) widened despite the increased facial inclination of the upper incisors (P = .0005). The treatment significantly decreased the gap between the lips (P = .0009) in their relaxed position.CONCLUSION:
Cervical headgear treatment in Class II correction is associated with a decreased facial convexity caused by the restriction of forward growth of the maxillary A-point, while the rest of the facial profile, including the mandible, continue to grow forward at a normal rate.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Ortodoncia Correctiva
/
Aparatos de Tracción Extraoral
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Cara
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Huesos Faciales
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Maloclusión Clase II de Angle
Tipo de estudio:
Diagnostic_studies
Límite:
Child
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Female
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Humans
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Male
Idioma:
En
Revista:
Angle Orthod
Año:
2007
Tipo del documento:
Article
País de afiliación:
Finlandia
Pais de publicación:
EEUU
/
ESTADOS UNIDOS
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ESTADOS UNIDOS DA AMERICA
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EUA
/
UNITED STATES
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UNITED STATES OF AMERICA
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US
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USA