In vitro plaque formation on some dental filling materials

The purpose of this study was to investigate the effects of filling and lining materials in various compositions on Streptococcus mutans. Five glass-ionomer cements (Vitrebond, XR Ionomer, Ketac-Bond, Shofu Base Cement, Shofu Lining Cement) and two composite materials (Heliomolar-RO, Concise) were used in this study. Samples from these materials were prepared in sterilized conditions and hung in tryptic soy broth medium containing 5% sucrose. The media were inoculated with Streptococcus mutans ATCC 13419. After 5 days, the plaque that had accumulated on the surfaces was scraped off and weighed in wet and dry conditions, Then the colonies were counted and evaluated in comparison with each other. The least amount of plaque and colony numbers were found on Vitrebond material disks, in conclusion, there were no differences among XR Ionomer, Heliomolar-RO and Ketac Bond. Concise gave better results than some materials containing fluoride; whereas the most abundant amounts of plaque were found on Shofu Lining Cement and Shofu Base Cement

The effect of different dental porcelain surface treatments on plaque formation

The purpose of this study was to investigate the effects of porcelain finishing techniques on the adherence of Streptococcus sobrinus. The finishing. lures (Unglazed, self-glazing, mechanical polishing, mechanical polishing + glazing, and glazing) were tested using an in vitro assay. The results exhibited that greatest amount of dry weight and the colony count of plaque occurred on the mechanical polished surfaces. However, the smallest amount of plaque occurred on the glazed porcelain surfaces

Bacteriology of dentoalveolar abscesses in patients who have received empirical antibiotic therapy

We investigated aspirates of pus from dentoalveolar abscesses in 13 patients who had received empirical antibiotic therapy within 1 month before presentation at our facility. The antibiotics administered were lincomycin, amoxicillin, ampicillin, or a cephalosporin. Information on antibiotic therapy was obtained from the patients' medical histories. Cultures of all dentoalveolar abscesses yielded organisms. A total of 70 isolates (42 anaerobes and 28 facultative organisms) were recovered, representing 5.3 isolates (3.2 anaerobes and 2.1 facultative organisms) per specimen. The counts of bacteria ranged from 5x10(7) cfu/ml to 8x10(11) cfu/mL (mean count, 1.4x10(11) cfu/mL; median count, 2.3x10(10) cfu/mL). The predominant isolates were Prevotella species (25.7% of isolates), Peptostreptococcus species (17.1%), and Streptococcus species (14.2%). This study illustrates the polymicrobial nature of dentoalveolar abscesses as well as the predominant role played by anaerobic bacteria