Ultrasonic propagation in a dental implant

International audienc

Measurement of the propagation of a guided wave in a dental implant

International audienceUltrasound techniques can be used to characterize and stimulate dental implant osseointegration. The acoustical energy transmitted to the bone-implant interface is an important parameter for both applications since it should be sufficiently low to avoid damaging the surrounding tissues, but sufficiently high for stimulation purposes to enhance bone growth. However, the interaction between an ultrasonic wave and a dental implant remains unclear. The objective of this study combining experimental, analytical and numerical approaches is to investigate the propagation of an ultrasonic wave in a dental implant by assessing the amplitude of the displacements along the implant axis. An ultrasonic transducer was excited in transient regime at 10MHz. Laser interferometric techniques were employed to measure the amplitude of the displacements, which varied between 5 to 12 nm according to the position. The results show the propagation of a guided wave mode along the implant axis with a first arriving signal velocity equal to 2110 m.s-1 and frequency components lower than 1 MHz, which was confirmed by the analytical and numerical results. This work paves the way to improve techniques for the characterization and stimulation of the bone-implant interface

Characterization of viscoelastic moduli and thickness of isotropic, viscoelastic plates using multi-modal Lamb waves

This paper presents an approach exploiting the sensitivity of Lamb waves for characterizing the viscoelastic moduli and thickness of plates. The analytical sensitivity functions are first derived in the case of an isotropic plate and are integrated into an iterative inverse problem to optimize its viscoelastic moduli and thickness based on a zero-finding approach (Gauss–Newton algorithm for a multivariable problem). This method is validated numerically for a viscoelastic plate and shows high accuracy and low computational cost when compared to existing methods. Experimental validation demonstrates the ability of the algorithm to assess simultaneously the viscoelastic moduli and the thickness of isotropic plate-like structures

Thermal characterization of viscoelastic materials using sonothermography

International audienc

Ultrasonic propagation in a dental implant

International audienc

Thermal characterisation of homogeneous materials using a weak formulation technique

International audienc

Sonothermography in composite materials: Finite Element modeling and experimental validation

International audienc