Évaluation de l'adaptation marginale de couronnes céramo-céramiques par microtomographie à rayon x

Abstract : Introduction: The growing use of intra-oral scanner in everyday dental work has enabled dentists to develop their practice. Based on the digital impression it is possible to produce prothetics chairside with the CAD/CAM technologie (computer-aided design/computer-aided manufacturing). There is a large choice of ceramics on the market which can be used to produce crowns. This study aims to compare two of them by measuring their marginal adaptation: lithium disilicates (IPS e.max CAD, Ivoclar Vivadent) and zirconia reinforced lithium silicate glass-ceramic (Suprinity, Vita-Zahnfabrik). Material and methods: 10 digital impressions are made with the intra-oral scanner CondorScan, and 10 crowns are fabricated, 5 are in IPS e.max CAD, 5 in Suprinity (n=5). Then, 20 measurements of the marginal gap and the absolute marginal discrepancy are made on each sample with micro-CT. Results: There is a significance difference between the two groups of crowns. The mean results for the IPS e.max group of crowns are 51.5930.04µm for marginal gap and 118.1846.75µm for absolute marginal discrepancy, while those of the Suprinity group are 67.0138.42µm and 138.8547.31µm. Results are, however, clinically acceptable. Conclusion: Crowns made with IPS e.max ceramic have a smaller marginal gap.
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Lydie Tellier. Évaluation de l'adaptation marginale de couronnes céramo-céramiques par microtomographie à rayon x. Sciences du Vivant [q-bio]. 2019. ⟨dumas-02089964⟩

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