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Effets dentaires et squelettiques du disjoncteur et du Quad hélix® : étude comparative d'un échantillon de 41 patients Volume 79, issue 3, Septembre 2008

Author
1 Azalea 1, Edificio F, 28 109 Madrid, Espagne
* jgirondev@ziving.com
Traduction de l’article original intitulé « Cambiosó seos y dentarios con disyunción y Quad hélix : estudio comparativo de una mustra de 41 pacientes », paru dans Ortodoncia Espagnola 2005;45(2) :64–73. Avec l’autorisation de la Sociedad Española de Ortodoncia et nos remerciements.

The aim of this study is to analyze the differences between three common ways of maxillary expansion. For that purpose, 41 patients between 7 and 10 years old, have been studied in a randomized way with different expansion techniques. They were assigned into one of the three following groups: (1) expansion with a Quad helix® appliance; (2) rapid palatal expansion with an acrylic bonded appliance; (3) rapid palatal expansion after uprighting the upper molars with a Quad helix appliance. The following changes were compared: skeletal expansion, dental expansion, axial inclination of the upper first molars and the influence in the vertical and sagital position of the mandible. Results concluded that there is more dental expansion and more molar extrusion in the Quad helix appliance group; that is more axial inclination of the upper molars in the rapid palatal expansion group; and that there is more skeletal expansion, more molar intrusion and negative molar torque in the rapid palatal expansion after uprighting the upper molars group.