Regarding Saos-2 viability at 24 h, this showed a trend similar to Mg-63 ( Figure 3(b) ); when the acoustic intensity was 38.9 W/cm 2 or higher, Saos-2 cell viability decreased compared to the untreated group, with the lowest value at 49 W/cm 2 ( p < 0.0005) in comparison to 23.3 W/cm 2 .
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