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혼합치열기 어린이에서 Streptococcus mutans와 Streptococcus sobrinus의 분포도 조사

Prevalence of Streptococcus mutans and Streptococcus sobrinus in children with mixed dentition

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참고문헌

키워드

주제분류치의학

초록

본 연구는 125명의 6-11세 혼합치열기 아동을 대상으로 연령에 따라 초기 혼합치열기 A군(6-8세; 62명)과 후기 혼합치열기 B군(9-11세; 63명)으로 분류하고 유치의 dfs, 영구치의 DFS를 기록한 후 자극성 타액을 채취하여 TYCSB배지에 배양해서 S. mutans와 S. sobrinus를 구분하였으며 PCR을 시행하여 확인하였다. S. mutans와 S. sobrinus의 분포도와 치아우식증과의 상관관계를 조사하여 다음과 같은 결과를 얻었다. 1. S. mutans와 S. sobrinus의 상관계수는 A군 0.70, B군 0.50로 두 군 모두에서 높은 상관관계를 보였다. 2. S. mutans와 치아우식증과의 관계는 A군(r=0.25)과 B군(r=0.34) 모두에서 약간의 관련성이 나타났다. 3. A군에서 S. sobrinus와 치아우식증간에 상관관계가 없는 것으로 나타났으며, B군(r=0.21)에서는 미약한 상관관계가 성립되었다. 4. S. mutans와 나이의 상관관계는 A군과 B군 모두에서 관련성이 없는 것으로 나타났다. 5. S. sobrinus와 나이의 상관관계는 A군(r=0.32)에서는 약간의 관련성이 나타났고, B군에서는 관련성이 없는 것으로 나타났다.

Abstract

Mutans streptococci have been reported to be implicated in dental caries. Of these streptococcal species, Streptcoccus mutans and Streptococcus sobrinus are most commonly found in human dental caries. Prevalence of these bacterial species in dental caries is found to be varied in different races and countries. Therefore, importance of these bacteria in dental caries remains to be determined. The present study was performed to find out correlation S. mutans and S. sobrinus with dental caries in 125 Korean children with mixed dentition between 6 to 11 years of age. They were classified as group A(6-8 years) and group B(9-11 years) by age. For the study, stimulated saliva samples were collected from each subject. The vials containing saliva specimens were serially diluted (1:10) in saline and plated in duplicate on tryptone-yeast extract-cysteine with sucrose and bacitracin (TYCSB) for S. mutans and S. sobrinus. After genomic DNA was extracted from the samples, polymerase chain reaction (PCR) amplification was performed for identification using universal primers and specific primers to S. mutans and S. sobrinus. Data of microbial variables were compared to caries status of the subjects. According to this study, the result were as follows: 1. S. mutans versus S. sobrinus were moderate positive linear correlated in both group A(r=0.70) and group B(r=0.50). 2. Between S. mutans and dental caries, there were weak positive linear correlation in both group A(r=0.25) and group B(r=0.34). 3. S. sobrinus versus dental caries were not correlated in group A but slightly correlated in group B(r=0.21). 4. Between S. mutans and age, there were not correlation in both group. 5. S. sobrinus versus age were weak correlated in group A(r=0.32) but not correlated in group B.

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