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Résumé

Le cas exposé décrit le traitement d'une jeune femme de 29 ans présentant une protrusion bimaxillaire importante chez qui lors d'un premier avis orthodontique les quatre prémolaires avaient été extraites. Cette patiente présentait une face convexe, un angle naso-labial fermé, une prochéilie avec éversion de la lèvre inférieure, une contracture des muscles mentonniers, le tout dans une occlusion de classe I d'Angle.
Après rétraction des dents antérieures en ancrage maximal par le biais de forces directionnelles, les modifications faciales étaient impressionnantes, avec une amélioration significative de la protrusion dento-alvéolaire. La rétraction des incisives avait corrigé la prochéilie, l'éversion de la lèvre inférieure et avait amélioré la projection du menton.

Abstract
Class I malocclusion with severe bimaxillary protrusion: a successful result

This case report describes the successful treatment of a 29-year-old young woman who had severe bimaxillary dento-alveolar protrusion, with the four premolars already extracted. Her face was convex, with a closed naso-labial angle, protruding and everted lower lip, associated with mentalis strain and a class I canine and molar relationships.
After retraction of anterior teeth by using maximum anchorage mechanics through directional forces, facial changes were impressive, with a significant improvement of the dento-alveolar protrusion. Retraction of the incisors had corrected proquelia, reduced lips eversion and had improved the chin projection. As the lips were retracted, mentalis strain was reduced; this improved chin projection.