Timing for Functional Treatment of Class II Division 1 Malocclusion

Kurt G., Guney V., Akcam O.

TURKISH JOURNAL OF ORTHODONTICS, vol.21, no.2, pp.99-107, 2008 (ESCI) identifier

  • Publication Type: Article / Article
  • Volume: 21 Issue: 2
  • Publication Date: 2008
  • Doi Number: 10.13076/1300-3550-21-2-99
  • Journal Indexes: Emerging Sources Citation Index (ESCI)
  • Page Numbers: pp.99-107
  • Keywords: Class II malocclusion, functional treatment, treatment timing, DENTOFACIAL ORTHOPEDICS, SKELETAL, GROWTH, MATURATION, OBJECTIVES
  • Bezmialem Vakıf University Affiliated: No


In the present study, the effects of Class II activator on dentofacial structures were evaluated considering three pubertal growth periods, to ascertain the most favorable treatment timing. Pre and posttreatment lateral cephalometric and hand wrist films, which were obtained from 36 individuals (1 st group: 12 pre-pubertal, 2 nd group: 12 pubertal and 3 rd group: 12 post-pubertal) having Class II, division 1 malocclusion were selected from the orthodontic department archive. Grouping was done considering growth periods ac cording to hand wrist maturation criteria. All the treatments were managed by using conventional type Class II activator. Comparison of skeletal and dentoalveolar responses achieved with treatment between the groups were evaluated by analysis of variance (ANOVA) and Tukey tests. Similar reduction was observed in the ANB angle among the groups. Increases in GoGn/SN angle (p< 0.05) and in posterior lower alveolar height (mean 2.3 mm) were found in the pubertal group. The largest overjet (mean, D 7.2 mm) and upper incisor tip (UIT) (mean, D 12.1 degrees) reductions were obtained in the pubertal group which was significantly different from the other groups (p<0.01and p<0.5, respectively). An increase in mandibular length (Co-Pg) was observed in each gro up and pubertal group showed the highest increase in the mandibular length (mean, 4.8 mm). As a result, it can be suggested that considering differential effects of functional treatment on dentofacial structures, the most appropriate treatment time for functional treatment is the maximum pubertal growth period.