[Effects of surface roughness of two restorative materials on early Streptococcus sanguis adhesion in vitro]

This was an in vitro study aimed at the surface roughness of two kinds of commonly used restorative materials resin and alloy necessary to affect the adhesive behavior of Streptococcus sanguis(S. s) on them after 24 h. The surface roughness(SR) of each tested sample was evaluated with a profilometer quantitatively and observed with scanning electron microscope (SEM) morphologically. Then the adhesive microbial amount was determined by the clone forming unit counting method, and adhesion morphology was analyzed with SEM. The result showed a positive linear relation between the adhesion amount of S. s and the SR. The relative coefficients were rresin = 0.46(P < 0.01) and ralloy = 0.25(P < 0.01) respectively. These suggest the SR of the restorative material is important for the early adhesion of oral microbes in vitro. Therefore, before the prothesis is inserted in the patient's oral cavity, its surface should be polished as smoothly as possible so that the bacterial adhesive amount on its surface can be decreased, and hence the patient may keep in good oral health and have a prolonged use of the prothesis.