Improved SDS-Page method for protein profiles analysis of actinomyces species

A simple, rapid SDS-Page method for protein profiles analysis of Actinomyces species was developed. Eighteen strains (12 reference strains and 6 fresh isolates) representing four species were used in this study. Eight detergents were tested for protein extraction. Cell extracts were obtained by shaking the bacteria suspended in a solution containing a detergent and glass beads. After electrophoresis, according to the Laemmli's technique, two protein stain procedure were tested (Coomassie blue and silver stain). Best results were obtained with 0.5% Triton X-100 for 4 h and the silver stain procedure of Oakley. Protein profiles analysis showed that the method is reproducible and distinguishes not only species but sometimes also subspecies.

[Evaluation of an immediate cleaning and decontamination device]

A new technical approach for immediate cleansing and decontamination was studied. Control of cleansing was observed using macroscopic and microscopic (S.E.M.) examinations on different instruments currently used in dentistry. Antiseptic solution was tested regarding four bacterial strains representative of the normal oral flora. The synergistic action of the combined solution plus pressure was effective for removal of debris before they dry. Antiseptic solution was bacteriostatic and at concentration level recommended by the manufacturer, viable colonies were not detected.

Antibacterial action of dental cements: an in vitro study

The antibacterial activity of seven commercially available dental cements (Eugespad, Dentical, Dycal, Expaliner, PR. Scell, PR. Base Cement, PR. Lining Cement) against 1) bacterial species implicated in carious lesions or in dental plaque (Actinomyces israelii ATCC 10048, Actinomyces viscosus ATCC 19246, Streptococcus mutans ATCC 25175, Streptococcus sanguis ATCC 10557) and 2) bacterial samples of stimulated saliva was studied, in vitro, using a modification of the method of McComb and Ericson (1987). Dycal and Expaliner did not affect bacteria whereas the other dental cements displayed some antibacterial properties. Eugespad was the most active followed by PR. Base Cement + PR. Scell + Dentical and by PR. Lining Cement. Associated with mechanical and biocompatibility properties, these differences could be taken into account when choosing a dental cement for clinical use.