title: Inhibitory effect of oral Lactobacillus against oral pathogens.
abstract: OBJECTIVE
  To determine the inhibitory effect of oral Lactobacillus against putative oral pathogens.
  
  
  RESULTS
  Total 357 strains comprising 10 species of oral Lactobacillus, Lactobacillus fermentum (195), Lactobacillus salivarius (53), Lactobacillus casei (20), Lactobacillus gasseri (18), Lactobacillus rhamnosus (14), Lactobacillus paracasei (12), Lactobacillus mucosae (12), Lactobacillus oris (12), Lactobacillus plantarum (11) and Lactobacillus vaginalis (10) were used as producer strains. Inhibitory effect against a panel of indicators, periodontitis- and caries-related pathogens, was assessed. Most oral Lactobacillus was able to inhibit the growth of both periodontitis- and caries-related pathogens. The strongest inhibitory activity was associated with Lact. paracasei, Lact. plantarum, Lact. rhamnosus, Lact. casei and Lact. salivarius. Lactobacillus SD1-SD6, representing the six species with the strong inhibitory effect, inhibited growth of Streptococcus mutans ATCC 25175 in the biofilm model. Also, it was demonstrated that growth of Strep. mutans was inhibited in a mixture with Lact. paracasei SD1. The inhibition was enhanced in acidic condition and 5% glucose.
  
  
  CONCLUSIONS
  The results have shown that oral Lactobacillus SD1-SD6 showed a strong inhibitory effect against Strep. mutans and Streptococcus sobrinus, as well as, Gram-negative periodontal pathogens Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans.
  
  
  CONCLUSIONS
  The results indicated that Lactobacillus may be of benefit as probiotics for the prevention of oral diseases.
authors.affiliation: Common Oral Diseases and Epidemiology Research Center, Faculty of Dentistry, Prince of Songkla University, Hat-Yai, Thailand. rawee.t@psu.ac.th
authors.forename: R
authors.initials: R
authors.lastname: Teanpaisan
authors.forename: S
authors.initials: S
authors.lastname: Piwat
authors.forename: G
authors.initials: G
authors.lastname: Dahlén
mesh_terms: D000898:Antibiosis; D018441:Biofilms / Q000254:growth & development; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007778:Lactobacillus / Q000302:isolation & purification / Q000502:physiology*; D008297:Male; D009055:Mouth / Q000382:microbiology*; D009059:Mouth Diseases / Q000517:prevention & control; D019936:Probiotics; D013295:Streptococcus mutans / Q000502:physiology