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Related Experiment Videos

The rhythms of human premolar eruption: a study using continuous observation

R K Risinger1, C J Trentini, R L Paterson

  • 1Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, USA.

Journal of the American Dental Association (1939)
|October 1, 1996
PubMed
Summary
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Mechanism and control of tooth eruption: overview and clinical implications.

Orthodontics & craniofacial research·2009

New research reveals human tooth eruption primarily occurs in the early evening. This discovery, using advanced optical technology, suggests optimal timing for orthodontic treatments influencing jaw growth and tooth movement.

Area of Science:

  • Dentistry and Oral Biology
  • Biomedical Optics
  • Chronobiology

Background:

  • Understanding the precise timing and mechanisms of human tooth eruption is crucial for orthodontics and developmental biology.
  • Previous research lacked the resolution to observe subtle, continuous tooth movements in vivo.

Purpose of the Study:

  • To precisely observe and characterize the dynamic process of human premolar eruption using novel optical technology.
  • To identify any diurnal patterns or previously unknown movements associated with tooth eruption.

Main Methods:

  • Utilized a video microscope system for continuous overnight tracking of erupting human premolars.
  • Employed Moiré magnification for ultra-high resolution (0.05 micrometer) observation of tooth movements.
  • Analyzed recorded data for temporal patterns and correlations with physiological rhythms.

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Main Results:

  • Tooth eruption predominantly occurs during the early evening hours.
  • Slight tooth intrusion was observed during daytime periods.
  • High-resolution imaging revealed cyclic movements (20-50 second period) synchronized with arterial pulse.

Conclusions:

  • Human tooth eruption exhibits a distinct diurnal rhythm, primarily in the early evening.
  • Tooth movement is influenced by physiological cycles, including the arterial pulse.
  • Timing of orthodontic interventions targeting jaw growth and tooth movement may significantly impact efficacy.