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. 2022 May 19;12:8498. doi: 10.1038/s41598-022-12498-6

Figure 1.

Figure 1

Standard image and QLF image of a representative sample in group I (SDF, sample #05) at different investigation times. The dashed line indicates the ground surface where the QLF measurements were performed. (a) Prior to demineralization. (b) Corresponding QLF-image: ΔF = 0.0%; ΔFmax = 0.0%. (c) After demineralisation (T-demin). (d) Corresponding QLF-image (T-demin): ΔF = − 17.0%; ΔFmax = − 34.1%. (e) QLF image T07: ΔF = − 12.2%; ΔFmax = − 28.6%. (f) QLF image T14: ΔF = − 12.8%; ΔFmax = − 30.2%. (g) QLF image T21: ΔF = − 11.5%; ΔFmax = − 33.3%. (h) 28 days after demineralisation (T28). (i) Corresponding QLF-image (T28): ΔF = − 14.5%; ΔFmax = − 30.2%.