bacterial adhesion of porphyromonas gingivalis on provisional fixed prosthetic materials

background: when provisional restorations are worn for long term period, the adhesion of bacteria becomes a primary factor in the development of periodontal diseases. the aims of this study were to evaluate the surface roughness and bacterial adhesion of four different provisional fixed prosthodontic materials. methods: ten cylindrical specimens were prepared from bis-acrylic composites (prevision cb and protemp 3 garant), a light-polymerized composite (revotek lc), and a polymethyl methacrylate-based (dentalon) provisional fixed prosthodontic materials. surface roughness was assessed by profilometry. the bacterial adhesion test was applied using porphyromonas gingivalis ( p. gingivalis ) and spectrofluorometric method. statistical analysis was performed using anova and dunnett t-tests. results: all tested materials were significantly rougher than glass (p < 0.05). revotek lc had the greatest fluorescence intensity, prevision and protemp 3 garant had moderate values and all of them had significantly more bacterial adhesion compared to glass (p < 0.05). dentalon had the lowest fluorescence intensity among the provisional fixed prosthodontic materials. conclusion: the quantity of bacterial adhesion and surface roughness differed among the assessed provisional fixed prosthodontic materials. the light-polymerized provisional material revotek lc had rougher surface and more bacterial adhesion compared with the others.