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치근단질환에서 형질전환성장인자-β와 기질금속함유단백분해효소 발현에 관한 연구
지정호,진태호 원광대학교 치의학연구소 1999 圓光齒醫學 Vol.9 No.1
The periapical response to injury is a complex interaction of inflammatory, immune, neural, vascular and synthetic activity. TGF-β is a potent modulator of proliferation and differentiation in various tissue, seems to lead to an increase in extracellular matrix. MMP are a family of proteolytic enzyme that mediate the degradation of extracellular matric macromolecules, but little is known about theirs possible role in periapical tissue. The purpose of this study is to investigate the differential expression of TGF-β and MMP-1 in tooth follicle, periapical abscess, granuloma and cyst. The expression of TGF-β and MMP-1 in Periapical tissue was evaluated by immunohistochemical staining and Western blot analysis. Correlationship among the periapical lesions were stastically analyzed. The degree of MMP-1 expression in periapical abscess was higher than in any other periapical lesion, and stastically significant. TGF-β expression is the prominent in granuloma than other periapical lesion, which was stastically significant. The increased expression of MMP and TGF-β was not co-related with inflammatory cell infiltration degree of the periapical cyst. The expression degree of MMP and TGF-β was not co-related with periapical abscess and cyst, but expression of MMP and TGF-β showed strong positive co-relationship with periapical granuloma, which was stastically significant. TGF-β expression by Western blot analysis was prominent in granuloma and cyst, and similar to the results by imunohistochemistry. MMP-1 expression is less than TGF-β , but there is not extreme difference between periapical lesion. These results suggest that TGF-β and MMP may be involved in tissue remodeling and has an important role in progress or mediation of periapical lesions.
감염근관에서 분리한 세균의 동정 및 항생제 감수성 검사
지정호,임미경 원광대학교 치의학연구소 1994 圓光齒醫學 Vol.4 No.2
Bacteria have been regarded as major etiologic factors in root canal infections. Infected root canal flora from thirteen patients who had visited to conservative department of Wonkwang dental hospital were cultured on blood agar plates. Cultured microorganisms were isolated and identified with Gram stain and biochemical tests using Vitek Systems (BioMeriux, MO, USA). Antibiotic susceptibility was performed with disk diffusion and broth microdilution using Vitek Systems. Gram positive cocci (65%) were predominant, which were composed of 6 Streptococcus viridans group. 5 Staph. spp., and 4 Enterococcus faecium, in the isolated 23 strains. Gram negative rods (26%) were the next common bacteria, which were composed of 5 nonfermentative Gram negative rods, and 1 Enterobacter cloacae. Most strains of S, viridans group and E. faecium were susceptible to antibiotics including penicillin. But strains of Staphylococcus spp. and non-fermentative Gram negative rods showed marked resistance to antibiotics except tetracyclin and cefotaxime. Most results between disk diffusion and microdilution were all agreed, but the results of non -fermentative Gram negative rods were susceptible to cefotaxime in disk diffusion method but resistant in microdilution.