TABLE 1.

Water contact angles on the different bacterial strains and substratum surfaces involved in this study, together with their zeta potentials in adhesion buffer^a

Bacterial strain or substratum surface	θw (°)	ζ (mV)
Bacterial strain
S. sobrinus HG1025	29	−14
S. oralis J22	24	−16
A. naeslundii T14V-J1	64	−12
B. fragilis 793E	35	−17
P. aeruginosa 974K	43	−26
Substratum surface
Glass	33	−17
DDS-coated glass	97	−11

^aAdhesion buffer contained 1 mM calcium chloride, 2 mM potassium phosphate, and 50 mM potassium chloride (pH 6.8). All data are the mean results of three experiments with separately grown bacterial strains and substratum surfaces, yielding an average standard deviation of around 5 degrees for the contact angles (θ_w) and 3 mV for the zeta potentials (ζ).