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. 2022 Jul 11;26(11):6593–6605. doi: 10.1007/s00784-022-04611-w

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Scanning electron micrograph images at magnifications 15 × , 500 × , and 1000 × showing the worn surfaces of the ceramic specimens after 200,000 wear cycles against the buccal cusps of natural premolars. PLD; partially crystallized lithium disilicate, FLD; fully crystallized lithium disilicate, ZLS; zirconia-reinforced lithium disilicate, SMZ; super-translucent monolithic zirconia, UMZ; ultra-translucent monolithic zirconia. b and c show severe debris retained on the worn surface of PLD (black arrows). Crack lines are present on surfaces of PLD and ZLS (white arrows)