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. 2021 Aug 17;26(1):939–955. doi: 10.1007/s00784-021-04077-2

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© The Author(s) 2021, corrected publication 2022

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Fig. 1 — Flow chart of the pilot (a) and the main study (b). An overview of number of dental zirconia bars, types of surface treatments and description of the analyses performed (flexural strength, surface analysis and XRD phase characterization) in both studies is shown