6 April 2017 Holographic interferometric and correlation-based laser speckle metrology for 3D deformations in dentistry
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The mechanical loading of dental restorations and hard tissue is often investigated numerically. For validation and optimization of such simulations, comparisons with measured deformations are essential. We combine digital holographic interferometry and digital speckle photography for the determination of microscopic deformations with a photogrammetric method that is based on digital image correlation of a projected laser speckle pattern. This multimodal workstation allows the simultaneous acquisition of the specimen’s macroscopic 3D shape and thus a quantitative comparison of measured deformations with simulation data. In order to demonstrate the feasibility of our system, two applications are presented: the quantitative determination of (1) the deformation of a mandible model due to mechanical loading of an inserted dental implant and of (2) the deformation of a (dental) bridge model under mechanical loading. The results were compared with data from finite element analyses of the investigated applications. The experimental results showed close agreement with those of the simulations.
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Markus Dekiff, Markus Dekiff, Björn Kemper, Björn Kemper, Elke Kröger, Elke Kröger, Cornelia Denz, Cornelia Denz, Dieter Dirksen, Dieter Dirksen, } "Holographic interferometric and correlation-based laser speckle metrology for 3D deformations in dentistry", Proc. SPIE 10127, Practical Holography XXXI: Materials and Applications, 101270B (6 April 2017); doi: 10.1117/12.2252307; https://doi.org/10.1117/12.2252307

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