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High-resolution observations of human premolar eruption
1Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, NC 27599-7450, USA.
Archives of Oral Biology
|January 1, 1996
Summary
Tooth eruption is a pulsatile, discontinuous process, not a continuous one. This study observed maxillary second premolar eruption in children, revealing short-term variations and cyclic movements synchronized with the arterial pulse.
Area of Science:
- Dentistry
- Developmental Biology
- Biophysics
Background:
- Tooth eruption is a complex biological process critical for oral function.
- Previous research has primarily focused on longer-term eruption patterns, with limited understanding of short-term dynamics.
Purpose of the Study:
- To investigate the short-term dynamics and patterns of tooth eruption during the prefunctional phase.
- To observe the eruption of maxillary second premolars in children with high-resolution imaging.
Main Methods:
- Utilized an optical instrument employing Moire magnification for sub-micrometer resolution (<0.1 μm).
- Observed eruption in 10 children over four sessions, monitoring maxillary second premolars.
- Recorded tooth movement in 30-minute intervals, correlating with the arterial pulse.
Main Results:
- A pulsatile tooth movement, synchronized with the arterial pulse, was observed in all participants.
- Significant short-term variations in eruption rates were noted, ranging from -0.91 to 2.29 μm/min.
- An unexplained cyclic phenomenon with a period of 20-50 seconds and magnitudes of 0.12-2.22 μm was consistently observed.
Conclusions:
- Tooth eruption is a discontinuous process, exhibiting significant short-term variability and cyclic movements.
- The findings suggest a dynamic, pulsatile mechanism underlying tooth eruption, influenced by physiological rhythms.
- Further research is needed to elucidate the mechanisms behind the observed cyclic phenomenon in tooth eruption.