[The effect of different roughness of crown alloy materials on the adhesion of predominant peri-implant subgingival bacteria.]

PURPOSE: To investigate the effect of two crown metal alloys with different roughness on the adhesion of predominant subgingival bacteria. METHODS: Au- Pt alloy and Ni-Cr alloy with different roughness were attached to the Ti implant material and incubated under anaerobic condition. The adhesion of four subgingival predominant bacteria: Porphyromanus gingivalis(Pg), Actinobacillus actinomycet-emcomitans (Aa), Prevotella intermedia (Pi) and Fusobacterium nuclertum (Fn), was detected, respectively. The quantity of bacteria clones on the different surface was counted by means of clone forming unit (CFU) method, and the shape and the growth characteristics of adhered bacteria were observed under scanning electron microscopy (SEM). The date was analyzed using SPSS13.0 software package. RESULTS: The amounts of the four subgingival predominant bacteria adhered to rougher surface of same alloy samples increased significantly (P<0.01), and the amount of bacteria adhered to the surface of Au-Pt alloy samples was much more than that to alloy Au-Pb samples with the same roughness (P<0.01). CONCLUSIONS: The effect of Au-Pt alloy is significantly greater than Au-Pb alloy to the adhesion of bacteria. The amount of bacteria adhered to rougher surface of same alloy samples is more than those to smooth one.Supported by Research Fund from Bureau of Science and Technology of Hebei Province(Grant No.032761961D-46).

Feng L, Li YJ, Meng LQ.

Department of Prosthodontics, Stomatological Hospital, Hebei University of Medical Sciences. Shijiazhuang 050017,Hebei Province,China.