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Failure statistics for (a) S. mutans biofilms on smooth titanium (solid red circles) and on rough titanium (open red circles) and (b) MG 63 cells on smooth titanium (solid blue circles) and on rough titanium (open blue circles) at increasing interface stress. Weibull models (smooth and dashed lines) are applied to interpolate the adhesion strength at a half-life of 50% failure. Error bars are the standard deviation of the calibrated interface stress at each point.
