No abstract available.

No abstract available.
Porphyromonas gingivalis* ; Porphyromonas* ; Virulence*

No abstract available.
Porphyromonas gingivalis* ; Porphyromonas* ; Virulence*

No abstract available.
Adult* ; Chronic Periodontitis* ; Humans

No abstract available.
Adult* ; Chronic Periodontitis* ; Humans

To investigate the pathogenicity, genomic pattern, and o-like hemolysin of Staphylococcus lugdunensis (S. lugdunensis) in acute oral infection, S. lugdunensis was isolated from patients with an acute oral infection and from healthy persons. Antibiotic susceptibility, in vitro cellular toxicity, in vivo virulence, and hemolytic activity were tested, and plasmid DNA and restriction pattern of whole genomic DNA were analyzed to characterize the staphylococci. The dot blot and Southern blot hybridization analysis of staphylococcal DNA were performed with o-hemolysin gene probe. The isolation ratio of S. lugdunensis in the patients was higher than that in the healthy persons. S. lugdunensis from the patients with an acute oral infection showed resistance to penicillin, ampicillin, methicillin, cephalothin, and clindamycin. In the analysis of plasmid, there was a clear band about 6.5 kb in three strains of S. lugdunensis isolated from the patients with infection. S. lugdunensis in the patients had cellular toxicity in vitro and virulence in vivo. All strains of S. lugdunensis had o-like hemolysin activity against rabbit erythrocytes. Four of the six strains of S. lugdunensis gave synergistic hemolysis with Staphylococcus aureus (S. aureus) on sheep blood agar plates. In the analysis of genomic pattern, four strains of S. lugdunensis that gave synergistic hemolysis with S. aureus showed a similar genetic pattern with HindIII enzyme digests. In dot blot analysis, all strains of S. lugdunensis showed a positive reaction with the probe of 5-hemolysin gene in S. aureus. In Southern blot analysis, a 7.3 kb HindIII fragment was observed in DNA of S. lugdunensis that gave synergistic hemolysis with S. aureus, and a 2.5 kb band was observed in HindIII digests of S. aureus in the patients. These results suggest that S. lugdunensis may be an important pathogen in an acute oral infection and the 7.3 kb HindIII fragment from S. lugdunensis DNA may contain o-like hemolysin gene.
Agar ; Ampicillin ; Blotting, Southern ; Cephalothin ; Clindamycin ; DNA ; Erythrocytes ; Hemolysis ; Humans ; Methicillin ; Penicillins ; Plasmids ; Sheep ; Staphylococcus aureus ; Staphylococcus lugdunensis* ; Staphylococcus* ; Virulence

No abstract available.
Adult* ; Chronic Periodontitis* ; Doxycycline* ; Humans

It has been reported that Magnoliae cortex extract has antibacterial and antimicrobial activity against pathogenic microbes and Zea Mays L. extract is effective for improving gingival tissue health. The purpose of this study was to examine the anti-inflammatory and antimicrobial effects of Zea Mays L. and Magnoliae cortex extract mixtures through experimental periodontitis induced beagle dog model. Nine beagle dogs with experimentally induced periodontitis were selected. Baseline clinical indices which includes plaque index, gingival index, probing pocket depth, clinical attachment level, gingival fluid flow rate were recorded and microbial assays were done. Magnoliae cortex and Zea Mays L., mixed at 2:1 ratio in 105mg capsular dosage, were taken by 3 capsule (Group I) or 6 capsule dosages (Group II) three times a day. After 4,8,12 weeks, clinical indices were recorded. All data of clinical indices were compared through one-way ANOVA with 95% confidence level. Clinical indices of group I and II showed significantly better results than those of control group. There were no significant differences between group I and II. In conclusion, it was confirmed that mixture of Magnoliae cortex and Zea Mays L. (mix ratio 2:1) possessed clinical improving effects to periodontitis.
Animals ; Dogs* ; Magnolia* ; Periodontal Index ; Periodontitis* ; Zea mays*

No abstract available.
Gingival Crevicular Fluid* ; Periodontal Diseases*

The purpose of this study was to perform on the biological activity of Magnolia and Zizyphi fructus extract mixtures on the wound healing of defected rat calvaria. For the determination of the mixture ratio of two extracts for oral administration, preliminary experiments were performed with the mixture combination of 2000 and 3000microgram/ml of Magnolia extract, and also 20, 30, 200, 300, 2000 and 3000microgram/ml of Zizyphi fructus extract, respectively and divided into 6 groups. The combination of extracts mixture were tested on the enhancing effect of cellular activity. The effect of the extracts mixture on the cellular activity was evaluated using MTT method and measured on the results with optical density by ELISA reader. The ability to tissue regeneration of the extracts mixture was performed by measuring new bone and new connective tissue regeneration on the 5mm defected rat calvaria for 1, 2 and 3 weeks after oral administration of 2 different dosages groups : 10:1(0.1g/kg) and 10:1(0.5g/kg). It was employed the same dosages of unsaponifiable fraction of Zea Mays L as positive controls. Each group of rat was sacrificed and en bloc section for histological examination. The effect on the cellular activity of each mixture ratio showed significantly higher in 2000microgram/ml of Magnolia extract and 200microgram/ml of Zizyphi fructus extract group to compare with other groups. These preliminary results showed that appropriate mixture ratio of two extracts was 10:1 of Magnolia and Zizyphi fructus extract. Histological examination on the activity of tissue regeneration of each group showed that 2weeks and 3weeks specimens of 0.5g/kg of 10:1 extract mixture of Magnolia and Ziziphi fructus administrated rat calvaria revealed significantly more osteoid and new bone formation of defected calvaria with unification of defected area than the specimens of any other negative and positive controls. Even though the specimen administrated the same dosages of unsaponifiable fraction of Zea Mays L, positive controls, showed the trend that they promote significantly the repair of calvarial defect, their bone reparative activities were less inductive than the same dosages of Magnolia and Ziziphi fructus extract mixture. These results implicated that the mixture of Magnolia and Zizyphi fructus extracts should be highly effective on the wound healing of bony defected site and might have potential possibilities as an useful drug to promote periodontal tissue regeneration.
Administration, Oral ; Animals ; Connective Tissue ; Enzyme-Linked Immunosorbent Assay ; Magnolia* ; Osteogenesis ; Rats ; Regeneration ; Skull ; Wound Healing ; Zea mays