Abstract: Objective To compare the adhesion ability of microorganisms to three different metal materials.Streptococcus mutans and Candida albicans were used in adhesion experiment in order to provide theoretical guidance for choosing the suitable clinical materials. Methods Three types of removable partial denture metal materials were selected, including Co-Cr alloy, Vitallium 2000 and pure titanium. 20 mm×10 mm×2.0 mm specimens of these dental materials were prepared, six test pieces in each material. Polishing was made to ensure that there was no obvious difference. Streptococcus mutans and Candida albicans, as experimental strains, were placed on suspension over plate and taken in culture for 48 hours, the amount of bacteria adhering to the specimen surface was assayed by means of clone forming unit(CFU) method after being eluted, shaked, and cultured. Results After 48 hours, the sequence of the adhesive capacity of the oral microorganisms on the surface of specimens was: Co-Cr alloy＞pure titanium＞Vitallium 2000(P＜0.05). Conclusion Compared with Co-Cr alloy and pure titanium, Vitallium 2000 candecrease the adhesion of microorganisms, and it is worth promoting and applying.

Key words: [Key words] microorganisms adhesion, Vitallium 2000, removable denture, materials