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Video microscope observations of human premolar eruption.
W R Proffit1, J R Prewitt, H S Baik
1Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill 27599-7450.
Journal of Dental Research
|January 1, 1991
Summary
Human premolar eruption occurs mainly at night, with movements averaging 25-75 microns daily. Masticatory activity during the day can slow or halt this tooth eruption process.
Area of Science:
- Dentistry
- Biomechanical Engineering
- Human Physiology
Background:
- Tooth eruption is a complex biological process critical for oral function.
- Understanding the precise mechanics and timing of eruption is essential for orthodontics and pediatric dentistry.
Purpose of the Study:
- To quantitatively measure the eruptive movements of human premolars with high accuracy.
- To investigate the diurnal patterns and influencing factors of tooth eruption.
Main Methods:
- Utilized a video microscope for micron-level tracking of tooth position.
- Employed optical rulings on erupting teeth and adjacent reference teeth to monitor movement.
- Recorded eruptive patterns from gingival emergence to the occlusal plane.
Main Results:
- Observed net daily eruptive movements of 25-75 microns in human premolars.
- Eruption primarily occurred during nighttime hours.
- Daytime activity, particularly mastication, was associated with slowed eruption or even tooth intrusion.
Conclusions:
- Human premolar eruption exhibits a distinct diurnal pattern, predominantly occurring at night.
- Masticatory activity significantly influences the rate and direction of tooth eruption.
- High-resolution microscopy enables detailed analysis of tooth biomechanics during eruption.