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Journal of Dental Research
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Streptococcus mutans Levels and Biotypes in Egyptian and Saudi Arabian Students During the First Months of Residency in the United States

M.M. Farghaly

School of Dentistry, The University of Michigan, Ann Arbor, Michigan 48109

S. Eklund

School of Dentistry, The University of Michigan, Ann Arbor, Michigan 48109

W.J. Loesche

School of Dentistry, The University of Michigan, Ann Arbor, Michigan 48109

Several studies indicated that serotype/biotype c strains are the most common on a global basis, but that regional differences may occur relative to other serotype/biotypes. Of particular interest is the observation that individuals residing in the Middle East have higher incidences of serotype e and d strains relative to their levels in American citizens. This could reflect exposure to different Streptococcus mutans serotypes during the period in which the teeth are colonized, or might reflect other factors local to the region, such as diet. The purpose of the present study was to observe Egyptian and Saudi Arabian students during the first four months after their arrival in the United States, in order to determine whether this change in habitat affected the levels and biotypes of S. mutans. The results of this study showed that biotype c strains were the most prevalent in saliva and plaque of these Egyptians and Saudi Arabian students, followed by biotype e and biotype d. There was a drop in the number of S. mutans in the saliva and the proportions of S. mutans in the plaque after two months of residence in the United States, followed by a significant increase after four months of residence. This increase was most noticeable in subjects who had a higher number of decayed surfaces. In these subjects, the percentage of S. mutans in pooled occlusal plaque increased significantly, from 6.1 to 13.2%.

Journal of Dental Research, Vol. 63, No. 1, 52-55 (1984)
DOI: 10.1177/00220345840630011201
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W.H. van Palenstein Helderman, M.I.N. Matee, J.S. van der Hoeven, and F.H.M. Mikx
Cariogenicity Depends More on Diet than the Prevailing Mutans Streptococcal Species
Journal of Dental Research, January 1, 1996; 75(1): 535 - 545.
[Abstract] [PDF]