Marginal Fit of CAD/CAM Crowns Milled From Two Different Ceramic Materials: Lithium Disilicate and Advanced Lithium DisilicatePerez Canals, Marta (2023) Marginal Fit of CAD/CAM Crowns Milled From Two Different Ceramic Materials: Lithium Disilicate and Advanced Lithium Disilicate. Master's Thesis, University of Pittsburgh. (Unpublished)
AbstractPurpose: To evaluate the marginal fit of CAD/CAM crowns milled from two different ceramic materials: Lithium disilicate and Advanced lithium disilicate (Lithium disilicate + Virgilite). Materials and Methods: A prefabricated typodont tooth #8 pre-prepared for an all-ceramic crown was imaged using CEREC Omnicam. A total of 28 crowns were milled from a single design: 14 CEREC Tessera (Dentsply Sirona), and 14 IPS e.max CAD (Ivoclar Vivadent) using CEREC MC XL milling machine. All samples were digitalized for 3D digital analysis. A single scan of the master die was obtained, and the intaglio surface of each crown was scanned. All scans were imported to Geomagic Control X software, and the master die was aligned with the intaglio surface of each sample. 3D compare was done to get an average measurement of marginal gap between the master die and the intaglio surface of each crown throughout the whole marginal area. Additionally, 8 points were selected on the margin to get measurements at specific areas: Buccal (B), MesioBuccal (MB), Mesial (M), MesioLingual (ML), Lingual (L), DistoLingual (DL), Distal (D), and DistoBuccal (DB). Data were analyzed using two-sample t-test. Results: In general, the values of CEREC Tessera were slightly lower than IPS e.max CAD. The average for Tessera was 69.4 μm, while the average for e.max CAD was 71.1 μm. Statistical analysis revealed no statistically significant difference in the average between the two groups (p=0.0075). When analyzing each of the 8 points individually, significant differences were found on DB (p=0.0033), D (p=0.00), L (p=0.00), and M (p=0.0012). Conclusions: Advanced lithium disilicate produces very good marginal integrity. Marginal gap values for both groups are all clinically acceptable (<120 μm). Within the limitations of this study, it can be concluded that advanced lithium disilicate material performs equal or slightly better than lithium disilicate in terms of marginal fit. Share
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