The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Short-term and long-term treatment outcomes with Class III activator

  • Ryu, Hyo-kyung (Department of Orthodontics, College of Dentistry, Wonkwang Dental Research Institute, Wonkwang University) ;
  • Chong, Hyun-Jeong (Private Practice) ;
  • An, Ki-Yong (Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University) ;
  • Kang, Kyung-hwa (Department of Orthodontics, College of Dentistry, Wonkwang Dental Research Institute, Wonkwang University)
  • Received : 2015.01.23
  • Accepted : 2015.05.01
  • Published : 2015.09.25
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Abstract

Objective: The purpose of this retrospective study was to investigate short-term and long-term skeletodental outcomes of Class III activator treatment. Methods: A Class III activator treatment group (AG) comprised of 22 patients (9 boys, 13 girls) was compared with a Class III control group (CG) comprised of 17 patients (6 boys, 11 girls). The total treatment period was divided into three stages; the initial stage (T1), the post-activator treatment or post-mandibular growth peak stage (T2), and the long-term follow-up stage (T3). Cephalometric changes were evaluated statistically via the Mann-Whitney U-test and the Friedman test. Results: The AG exhibited significant increases in the SNA angle, ANB angle, Wits appraisal, A point-N perpendicular, Convexity of A point, and proclination of the maxillary incisors, from T1 to T2. In the long-term follow-up (T1-T3), the AG exhibited significantly greater increases in the ANB angle, Wits appraisal, and Convexity of A point than the CG. Conclusions: Favorable skeletal outcomes induced during the Class III activator treatment period were generally maintained until the long-term follow-up period of the post-mandibular growth peak stage.

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References

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