title: Predominant cultivable microflora of supragingival dental plaque in Chinese individuals.
abstract: The aim of this study was to determine the predominant supragingival cultivable bacterial flora in Chinese individuals, using the experimental gingivitis model. A total of 11 healthy dental students, mean age 22.5 years (range 20-25) were recruited. All were provided with once-a-week dental prophylaxis and oral hygiene reinforcement for 3 weeks to ensure gingival health. In the fourth week, after prophylaxis, the participants entered a 14-day period without any plaque control. A plaque sample was collected at days 1, 3, 7 and 14 from the buccal surface of the upper right canine, second premolar, first premolar and first molar, respectively. Each sample was then dispensed in tryptic soy-broth transport medium and grown anaerobically to obtain pure cultures, which were subsequently identified. Results showed that Gram-positive cocci and rods were the predominant cultivatable species (51-61%) in the samples throughout the 14-day period; with time there was a decreasing percentage of cocci and an increasing percentage of rods. Gram-negative cocci and rods increased in proportion with the plaque age (11-37%). Streptococcus spp. were the predominant Gram-positive cocci while Actinomyces were the predominant Gram-positive rods isolated. Fusobacterium and Capnocytophaga spp. were the two most frequent Gram-negative anaerobic rods cultured. The results compared with those from other analogous studies from the West suggest the possibility of interracial differences in supragingival plaque flora.
authors.affiliation: Department of Periodontology, Faculty of Dentistry, University of Hong Kong, Hong Kong.
authors.forename: K Y
authors.initials: KY
authors.lastname: Zee
authors.forename: L P
authors.initials: LP
authors.lastname: Samaranayake
authors.forename: R
authors.initials: R
authors.lastname: Attström
authors.forename: W I
authors.initials: WI
authors.lastname: Davies
mesh_terms: D000328:Adult; D044466:Asian People; D001421:Bacteria, Anaerobic / Q000302:isolation & purification; D003773:Dental Plaque / Q000208:ethnology* / Q000382:microbiology*; D004032:Diet; D006090:Gram-Negative Bacteria / Q000302:isolation & purification; D006094:Gram-Positive Bacteria / Q000302:isolation & purification; D006723:Hong Kong; D006801:Humans; D044465:White People