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Communication Dans Un Congrès Année : 2019

Performance indicators for prosthesis surface integrity after dental CAD/CAM milling

Résumé

Various dental diseases lead to prosthetic rehabilitation. Today, prostheses can be manufactured from refabricated biomaterial raw blocks, which are milled with a CAD/CAM process. The quality of these prostheses can be assessed using roughness, a major surface integrity (SI) component in dentistry [1]. SI is the characteristic signature of the milling process on the generated prosthesis shape [2]. The major challenge in restorative dentistry is to manufacture prostheses, which are able to rehabilitate the teeth in order to fulfil functional performance and aesthetic requirements. For each requirement, a specific SI might be manufactured in different anatomical area of the prosthesis. Aesthetics, biological response and restoration lifetime require a low surface roughness. On the contrary, the surface to be bonded on the remaining dental tissues needs to be sufficiently rough. The main difficulty for prosthesis manufacturers is to integrate the different expected SI during CAM process and to choose the milling process parameters in accordance with the expected prosthesis functionalities. This paper aims to evaluate and quantify the influence on SI of milling tools characteristics, biomaterials properties, and milling process parameters. A comparison to the clinically desired SI is conducted with two performance indicators (PI). a) a weighted relative mean PI named MSI. b) a weighted relative standard deviation PI named SISD. Based on milling experimental results capitalization and the clinically desired SI, the PI are locally computed among the prosthetic shape and displayed on a 3D mapping of the prosthesis shape (figure 1). The mapping results, applied on a crown prosthesis study case, show a limited influence of the tool feedrate parameter, whereas the tool diamond grit size, the tool/prosthesis inclination, and the biomaterials are more significant factors. The use of the PI during the CAM step emphasizes that a topological decomposition of the crown shape is necessary to associate reliable local milling process parameters. The PI provide a valuable assistance to the prosthesis manufacturers to choose efficiently milling parameters according to the prosthesis roughness requirements or to anticipate the post-processing polishing process. These PI can be enriched by new milling experimental results and new relevant SI components.
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hal-04192735 , version 1 (31-08-2023)

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  • HAL Id : hal-04192735 , version 1

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Lebon Nicolas, Laurent Tapie, Elsa Vennat. Performance indicators for prosthesis surface integrity after dental CAD/CAM milling. CMBBE 2019, Columbia University, Aug 2019, New York (USA), United States. ⟨hal-04192735⟩
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