비우식아동과 고도우식아동의 Streptococcus mutans 특성 비교
The comparison of the characteristics of Streptococcus mutans isolated from caries free and high caries children
김지혜, 정은경, 최연희, 송근배,
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김지혜 ( Kim Ji-Hye ) - 경북대학교 치의학전문대학원 예방치과학교실
정은경 ( Jung Eun-Kyung ) - 울산과학대학 치위생과
최연희 ( Choi Youn-Hee ) - 경북대학교 치의학전문대학원 예방치과학교실
송근배 ( Song Keun-Bae ) - 경북대학교 치의학전문대학원 예방치과학교실
KMID : 0355420120360010001
Abstract
Objectives: Streptococcus mutans (S. mutans) is the major causative bacteria in human dental decay. Most findings have shown that S. mutans are widely distributed in populations with moderate to high caries prevalence. However, observations have shown that S. mutans are also frequent in populations with low caries prevalence, as well. This study evaluated the relationship between the dental caries experience and the virulence factors of S. mutans, which are isolated from caries-free and high-caries individuals.
Methods: The dental caries experience states with the WHO diagnostic criteria, which were examined for children (aged 8 to 9 years) from two schools that are located in Daegu, Korea. A total of 22 cariesfree (dfs+DFS=0) and 12 high-caries (dfs+DFS≥14, ds+DS≥9) were selected for this study. Dental plaque samples were obtained and incubated in MSB plate to culture S. mutans . After isolation and identification, the level of S. mutans, attachment ability, and streomicroscopy were analyzed.
Results: The S. mutans counts and attachment ability were higher in the high-caries group than in the caries-free group (P<0.05). In addition, the colonies isolated from the caries-free group adhered less strongly to the Mitis Salivarius Bacitracin agar. There were less of the sticky substances from the surface of the S. mutans colonies in the caries-free group.
Conclusion: These results indicate that caries activity affected by the virulence not only the number of S. mutans.
키워드
독력; 우식활성; Streptococcus mutans
Dental caries; Streptococcus mutans; Virulence
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