Teeth have different degrees of mobility, which can be influenced by several factors such as width periodontal space, physical properties of the periodontal membrane of the alveolar bone, shape, length and number of the roots, position of the tooth in the dental arch, amplitude and direction of applied forces. In the diagnostic phase it is important to objectively determine the degree of teeth mobility before it becomes assessable through manual inspection. Up to now, measurements of the mobility degree have been made by the application of static loads and measurement of the consequent displacement. This work presents a new technique based on the assessment of the mobility degree through the application of dynamic loads. An impulsive excitation is applied on the tooth by means of an impact hammer and the displacement is measured by a laser Doppler vibrometer that allows versatile non-contact measurements with high accuracy. The ratio between the maximum of the tooth displacement and the input force peak has been considered as a mobility degree index. An introductory in-vitro study has been carried out on real extracted teeth mounted on structures characterised by different stiffness levels. Subsequently, an in-vivo study has been carried out on the teeth of a healthy patient. The present work aims to describe the proposed techniques and to show some of the results thus obtained.

Teeth mobility measurement: a laser vibrometry approach / Castellini, Paolo; Scalise, Lorenzo; Tomasini, Enrico Primo. - In: JOURNAL OF CLINICAL LASER MEDICINE & SURGERY. - ISSN 1044-5471. - STAMPA. - 16(5):(1998), pp. 269-272. [10.1089/clm.1998.16.269]

Teeth mobility measurement: a laser vibrometry approach

CASTELLINI, Paolo;SCALISE, Lorenzo;TOMASINI, Enrico Primo
1998-01-01

Abstract

Teeth have different degrees of mobility, which can be influenced by several factors such as width periodontal space, physical properties of the periodontal membrane of the alveolar bone, shape, length and number of the roots, position of the tooth in the dental arch, amplitude and direction of applied forces. In the diagnostic phase it is important to objectively determine the degree of teeth mobility before it becomes assessable through manual inspection. Up to now, measurements of the mobility degree have been made by the application of static loads and measurement of the consequent displacement. This work presents a new technique based on the assessment of the mobility degree through the application of dynamic loads. An impulsive excitation is applied on the tooth by means of an impact hammer and the displacement is measured by a laser Doppler vibrometer that allows versatile non-contact measurements with high accuracy. The ratio between the maximum of the tooth displacement and the input force peak has been considered as a mobility degree index. An introductory in-vitro study has been carried out on real extracted teeth mounted on structures characterised by different stiffness levels. Subsequently, an in-vivo study has been carried out on the teeth of a healthy patient. The present work aims to describe the proposed techniques and to show some of the results thus obtained.
1998
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11566/72262
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