Impact response of periodontal tissues |
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| Authors: | H Oka T Yamamoto T Kawazoe K Saratani Y Hikida |
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| Institution: | (1) Department of Electrical & Electronic Engineering, Faculty of Engineering, Okayama University, 3-1-1 Tsushima-Naka, 700 Okayama, Japan;(2) The 2nd Department of Prosthetic Dentistry, Osaka Dental University, 1-4 Kyobashi, Higashi-ku, 540 Osaka, Japan |
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| Abstract: | A new impact response method using a fracture of a pencil-lead to produce an excitation pulse is proposed. Impact excitations
(rectangular pulse, triangular pulse and half-sine pulse) are strictly given in physical and mathematical definitions and
complete solutions to the impact excitations are provided for Noyes' model of the human tooth. When a relatively long triangular
pulse is applied to Noyes' model, which can express the physical characteristic of periodontal tissues, a sinusoidal damped
vibration of a single degree-of-freedom model is approximately obtained. The acceleration response is characterised by the
physical parameters (T, δ and Ao) and mechanical elements (m1, c1 and k) of which a single degree-of-freedom model is composed. By means of this method, the values of the parameters and elements
in the cases of healthy maxillary, healthy mandibular and pathological mandibular incisors are obtained. The single degree-of-freedom
model can express the high-frequency spectra of Noyes' model. The pathological tooth is characterised by a longer damped time
constant and a larger acceleration maximum. This impact response method can effectively be applied to clinical diagnosis in
view of the physical parameters and mechanical elements which have been derived. |
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| Keywords: | Acceleration response Impact response Mechanical impedance Periodontal tissues Single degree-of-freedom model Tooth mobility |
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