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Representative QCM-D plots of ΔF (red curve) and ΔD (blue curve) vs time for sensors coated with (a) gold, (b) stainless steel, (c) alumina and (d) zirconia, sequentially exposed to water for system stabilization, FS for formation of salivary pellicle and water for rising attached pellicle (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article).
