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Changes in occlusion between 23 and 34 years

O Bondevik1

  • 1Department of Orthodontics, School of Dentistry, University of Oslo, Norway.

The Angle Orthodontist
|March 21, 1998
PubMed
Summary
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Adult dental models revealed minor occlusal changes over time, with males experiencing larger shifts than females. The mandibular arch perimeter notably decreased, impacting dental alignment in adults without orthodontic intervention.

Area of Science:

  • Dentistry
  • Orthodontics
  • Human Biology

Background:

  • Occlusal changes can occur throughout adulthood.
  • Understanding these changes is crucial for dental health and treatment planning.
  • Longitudinal studies on adult dentition are essential.

Purpose of the Study:

  • To investigate longitudinal occlusal changes in adult dentition.
  • To quantify shifts in dental arch dimensions and tooth relationships.
  • To compare changes between males and females over time.

Main Methods:

  • Analysis of dental study models from 144 individuals (64 females, 80 males) of Norwegian descent.
  • Measurements taken at average ages of 23 and 34 years.
  • Subjects had no orthodontic treatment or surgery during the observation period.

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Main Results:

  • Mean occlusal changes were small (<0.55 mm) and generally larger in males.
  • A significant decrease in mandibular anterior perimeter (up to 2.5 mm) was observed in both sexes.
  • Mandibular intercanine width and intermolar distance showed significant changes.
  • Maxillary arch perimeter decreased significantly in females; overjet and overbite decreased significantly in males.

Conclusions:

  • Adult dentition undergoes subtle but measurable changes, particularly in the mandibular arch.
  • Individual prediction of occlusal changes is challenging due to variable responses.
  • These findings have implications for understanding natural dental drift and stability in adults.