sodium-hypochlorite and bis(trichloromethyl)sulfone

This study demonstrated that bacteria penetrate three kinds of dental acrylic resin after a short time period. Samples of acrylic resin were contaminated with a variety of bacteria and were then placed in three different disinfecting solutions as directed by the manufacturers. After the specific dilution and immersion time, cultures were made from the resin samples. The only effective disinfectant was a 0.525% solution of sodium hypochlorite at a 10-minute immersion. It disinfected not only the surfaces but also the bacteria that penetrated the surfaces to a depth of 3 mm.

Topics: Acrylic Resins; Biofilms; Chlorine; Chlorine Compounds; Colony Count, Microbial; Dental Prosthesis; Disinfectants; Escherichia coli; Oxides; Pseudomonas aeruginosa; Sodium Hypochlorite; Staphylococcus aureus; Streptococcus pneumoniae; Sulfones

Representative samples of hard surface disinfectants were tested against Pseudomonas aeruginosa (ATCC 27853) on frosted glass rods. The same protocol was followed by two investigators on 100 rods for each product tested. Results showed Sporicidin surface disinfectant (Ash Dentsply, York, Pa.) and household bleach 1:10 to be most effective against P. aeruginosa. Lysol disinfectant spray (Lehn & Fink Products, Montvale, N.J.), performed similarly whereas Biocide (Biotrol International, Woods Cross, Utah) failed to inhibit growth on more than half of the rods treated. Failure of the iodophor may be attributed to the use of cotton-filled gauze, because cellulose is believed to react with nascent iodine.

Topics: Cresols; Disinfectants; Equipment Contamination; Evaluation Studies as Topic; Glass; Glutaral; Iodophors; Microbial Sensitivity Tests; Pseudomonas aeruginosa; Sodium Hypochlorite; Sulfones; Surface Properties