Dr. Michel Fages Profile

Dr. Michel Fages

at Univ Montpellier

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Author

Publications (4)

Proceedings Article | 21 June 2019 Presentation + Paper

A review on optical methods to assess dental behavior under stress

Pascal Picart, Michel Fages, Pierre Slangen, Haiting Xia, Silvio Montresor, Rongxin Guo, Junchang Li, O. Yusuf Solieman, Jean-Cédric Durand

Proceedings Volume 11060, 110600B (2019) https://doi.org/10.1117/12.2531773

KEYWORDS: Teeth, Digital holography, Ceramics, 3D metrology, Holography, Fringe analysis, Deflectometry, Speckle interferometry, Interferometry, Digital photography

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Proceedings Article | 28 February 2019 Presentation + Paper

Method to approximate intra oral scanner noise and resolution

A. Desoutter, O. Yusuf Solieman, G. Subsol, M. Fages, F. Cuisinier

Proceedings Volume 10857, 1085707 (2019) https://doi.org/10.1117/12.2509460

KEYWORDS: Information operations, Scanners, Ceramics, Atomic force microscopy, Dentistry, Distance measurement, Computed tomography, Excel, 3D scanning

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Proceedings Article | 7 September 2018 Paper

Analysis of computerized aided designed and manufactured dental occlusal ceramics with multi-wavelength digital holography

H. Xia, P. Picart, S. Montresor, R. Guo, J. C. Li, O. Solieman, J. C. Durand, M. Fages

Proceedings Volume 10834, 108341H (2018) https://doi.org/10.1117/12.2319231

KEYWORDS: Teeth, Digital holography, Ceramics, Holograms, Holography, Sensors, Manufacturing, Doppler effect, Computer aided design, 3D metrology

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Proceedings Article | 14 September 2010 Paper

Prosthetic clone and natural human tooth comparison by speckle interferometry

Pierre Slangen, Stephane Corn, Michel Fages, Jacques Raynal, Frederic J. Cuisinier

Proceedings Volume 7387, 73870D (2010) https://doi.org/10.1117/12.870748

KEYWORDS: Teeth, Speckle interferometry, Optical fibers, Ceramics, Transducers, Interferometers, Phase shifting, Optical testing, Optics manufacturing, Phase shifts

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New trends in dental prosthodontic interventions tend to preserve the maximum of "body" structure. With the evolution of CAD-CAM techniques, it is now possible to measure "in mouth" the remaining dental tissues. The prosthetic crown is then designed using this shape on which it will be glued on, and also by taking into account the contact surface of the opposite jaw tooth. Several theories discuss on the glue thickness and formulation, but also on the way to evolve to a more biocompatible crown and also new biomechanical concepts. In order to validate these new concepts and materials, and to study the mechanical properties and mechanical integrity of the prosthesis, high resolution optical measurements of the deformations of the glue and the crown are needed. Samples are two intact premolars extracted for orthodontics reasons. The reference sample has no modifications on the tooth while the second sample tooth is shaped to receive a feldspathic ceramic monoblock crown which will be glued. This crown was manufactured with a chairside CAD-CAM system from an intra-oral optical print. The software allows to realize a nearly perfect clone of the reference sample. The necessary space for the glue is also entered with ideal values. This duplication process yields to obtain two samples with identical anatomy for further processing. The glue joint thickness can also be modified if required. The purpose is to compare the behaviour of a natural tooth and its prosthetic clone manufactured with "biomechanical" concepts. Vertical cut samples have been used to deal with planar object observation, and also to look "inside" the tooth. We have developed a complete apparatus enabling the study of the compressive mechanical behaviour of the concerned tooth by speckle interferometry. Because in plane displacements are of great interest for orthodontic measurements¹, an optical fiber in-plane sensitive interferometer has been designed. The fibers are wrapped around piezoelectric transducers to perform "4-buckets" phase shifting leading to phase variations during the compression test. In-plane displacement fields from speckle interferometry already showed very interesting data concerning the mechanical behaviour of teeth: the dentine-enamel junction (DEJ) and the glue junction have been shown including their interfacing function. Mechanical action of the tooth surrounding medium will also be discussed.

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