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      Age effects on orthodontic treatment: skeletodental assessments from the Johnston analysis.

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          Abstract

          We have compared differences in treatment outcomes dependent on patient age, either adolescent (means = 12.5 years at start) or adult (means = 27.6). Subjects were female patients whose Class II, Division 1 malocclusions were treated with Tweed edgewise mechanics and four-premolar extractions. Cephalometric records were assessed according to the Johnston analysis. The functional occlusal plane remained stable during mechanotherapy in the adolescents, whereas it steepened considerably in the adults. Differential mandibular growth in adolescents contributed 70% of the total molar correction, with orthodontic tooth movement accounting for the other 30%. Maxillary growth in the adults detracted from the Class II molar correction; tooth movement accounted for virtually all of the correction.

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          Author and article information

          Journal
          Am J Orthod Dentofacial Orthop
          American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics
          Elsevier BV
          0889-5406
          0889-5406
          Dec 1991
          : 100
          : 6
          Affiliations
          [1 ] Department of Orthodontics, College of Dentistry, University of Tennessee.
          Article
          0889-5406(91)70093-C
          10.1016/0889-5406(91)70093-C
          1962606
          34174917-e08d-45fa-90f2-173d43d46f30
          History

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