Tweed-Merrifield sequential directional force nonpremolar extraction treatment: a case report.
The treatment of a Class II, Division 1 malocclusion without the extraction of premolars is, in many situations, the best solution for the patient. Nonpremolar extraction diagnosis followed by mechanotherapy with a nontorqued, nonangulated .022 edgewise appliance and the "Twelve-Two" System of Sequential Directional Force application is described.
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D002508:Cephalometry; D002648:Child; D003799:Dental Stress Analysis; D005115:Extraoral Traction Appliances; D005260:Female; D005386:Fingersucking / Q000009:adverse effects; D006801:Humans; D008312:Malocclusion, Angle Class II / Q000209:etiology / Q000628:therapy*; D008963:Molar; D009967:Orthodontic Appliances; D009971:Orthodontics, Corrective / Q000379:methods*; D014081:Tooth Extraction