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. 2019 Jun 6;13(1):75–81. doi: 10.1055/s-0039-1688535

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This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 1 — The scanning electron microscope images of the porcelain with different surface treatments at ×500: (a) Control, (b) hydrofluoric, (c) hydrofluoric and calcium hydroxide, (d) hydrofluoric and calcium carbonate, (e) hydrofluoric and calcium gluconate, and (f) hydrofluoric and ultrasonic cleaning.