钴铬合金表面粗糙度与细菌黏附

目的：了解临床用软质钴铬合金表面粗糙度与细菌黏附的关系。方法：用Talysurf/S5-CD型表面形貌仪测定六组软质钴铬合金试片表面粗糙度。采用体外黏附试验，了解变形链球菌在软质钴铬合金表面的黏附量受表面粗糙度影响的状况。结果：随着研磨和抛光程序的进行，钴铬合金表面粗糙度逐渐减低，其表面的细菌黏附量也不断减少。其中橡皮轮组和抛光膏组之间的表面粗糙度均值和细菌黏附量无显性差异，其余各组间表面粗糙度均值和细菌黏附量均有显性差异。结论：为减少菌斑附着，制作钴铬合金冠修复体后要重视磨光。

Influence of surface ronghness of chromium-cobalt on adhesion of bacterium

Objective: To investigate the correlation between surface roughness of chromium-cobalt and bacteria adhesion. Methods: Six kinds of chromium-cobalt pieces with different surface were determined by Talysurf/S5-CD topographer. Ra value were gathered. S. mutans were used in adhesion experiment. Results: The surface roughness value and the amount of plaque adhesion decreased with the increase in polishing level. Statistical difference was observed between groups of bacteria adhesion and the same in groups of surface roughness besides the rubber wheel and polishing group. Conclusions: To minimize the amount of plaque adhesion, the surface of Co-Cr crowns should be polished as smooth as possible.