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Longitudinal growth changes in subjects with open-bite tendency: a retrospective study.

Angie Phelan1, Lorenzo Franchi2, Tiziano Baccetti3

  • 1Orthodontist, Discipline of Orthodontics, Faculty of Dentistry, University of Sydney, Surry Hills, New South Wales, Australia.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|December 31, 2013
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Summary
This summary is machine-generated.

Untreated subjects with an open-bite tendency showed overbite improvement during the prepubertal stage. No significant changes occurred post-puberty, indicating optimal timing for orthodontic intervention.

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Area of Science:

  • Orthodontics
  • Craniofacial Growth
  • Dental Development

Background:

  • Cephalometric evaluation of growth changes in untreated subjects with minimal overbite.
  • Study covers developmental stages from early mixed dentition to permanent dentition and prepubertal phase to young adulthood.

Purpose of the Study:

  • To evaluate longitudinal growth changes in overbite in untreated individuals.
  • To determine the self-correction potential of open-bite tendencies during different developmental stages.
  • To provide insights into optimal orthodontic treatment timing for open-bite tendencies.

Main Methods:

  • Retrospective analysis of 24 untreated subjects with minimal overbite (<1.5 mm).
  • Longitudinal follow-up from approximately 9 to 17 years of age.
  • Lateral cephalograms analyzed at four time points (T1-T4) using the cervical vertebral maturation method; nonparametric statistical analysis employed.

Main Results:

  • Average overbite increased by 2.3 mm over the observation period.
  • Significant overbite improvement (2.4 mm) occurred during the prepubertal interval (T1-T2).
  • No significant changes in overbite were observed during pubertal and postpubertal stages; 91% of subjects showed improvement in open-bite tendency, with 75% self-correction.

Conclusions:

  • Open-bite tendency improves during the prepubertal stage in untreated individuals.
  • No significant occlusal improvement occurs after the prepubertal stage.
  • Findings offer guidance for timing orthodontic interventions for patients with open-bite tendencies.