Abstract
How functional occlusal pressure on teeth is relieved is unclear. Consequently this paper uses frequency analysis in an attempt to evaluate and compare the difference in dynamics between the tooth crown and root. Comparing these results with those obtained by linear level method as described in the previous paper leads to the following conclusions:
1. In both the crown and root the highest measured levels were 2-4 kHz vertically and 500 Hz-2 kHz horizontally.
2. A resonant tendency was observed at the crown rather than the root vertically and the root rather than the crown horizontally in the highest measured levels.
3. The difference in dynamics between the tooth crown and root can be determined by either the frequency analysis method or the linear level method.
4. In multirooted teeth, the peak spectrum moved to the lower frequency band after the root separation.
