Ahmady K, Marsh P D, Newman H N, Bulman J S
Department of Periodontology, University of London, UK.
Caries Res. 1993;27(2):135-9. doi: 10.1159/000261531.
The distribution and prevalence of Streptococcus mutans and Streptococcus sobrinus were determined at three sub-sites in human approximal plaque: away from (A), to the side of (S) and below (B) the contact area. Small plaque samples were taken from all three sub-sites on clinically sound approximal surfaces of a single premolar from each of 21 schoolchildren. S. mutans was detected significantly more often and in higher proportions than S. sobrinus from sub-sites A (p = 0.019), S (p = 0.034) and B (p = 0.004). S. mutans was detected in highest proportions from the B site compared to the A site (p = 0.025); there were no significant differences in the isolation frequency or prevalence of S. sobrinus from any of the sub-sites. S. mutans and S. sobrinus were never isolated together from the A sub-sites and were recovered together most commonly from the B sub-sites (p < 0.01). It is concluded that S. mutans and S. sobrinus preferentially colonise the most caries-prone site apical to the contact area.
远离接触区（A）、接触区侧面（S）和接触区下方（B）。从21名学童每人一颗单尖牙临床健康的邻面表面的所有三个亚部位采集小菌斑样本。在亚部位A（p = 0.019）、S（p = 0.034）和B（p = 0.004）中，变形链球菌的检出频率和比例显著高于远缘链球菌。与A部位相比，B部位变形链球菌的检出比例最高（p = 0.025）；远缘链球菌在任何亚部位的分离频率或流行率均无显著差异。变形链球菌和远缘链球菌从未在A亚部位同时分离到，而在B亚部位最常同时分离到（p < 0.01）。得出的结论是，变形链球菌和远缘链球菌优先定殖于接触区根尖最易患龋的部位。
