To implicate a specific bacterium in the etiology of dental caries, what criteria must it meet______________?
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Answer: A. Exist regularly in the dental plaque
Explanation
Candidate bacteria must exist regularly in dental plaque to cause dental caries. Microorganisms must be present at high proportions in active demineralization sites. Colonization of the tooth surface is the mandatory first step in pathogenesis. Dental caries is a multifactorial infectious disease driven by acidogenic bacterial biofilms. Koch's postulates and modern modifications guide microbial disease association studies. Streptococcus mutans and lactobacilli are classic examples meeting these criteria.
Understanding microbial etiology guides preventive strategies such as fluoride and sealants. Bacterial profiling helps clinicians assess individual patient caries risk levels. Targeted antimicrobial therapies aim to reduce pathogenic bacterial loads in plaque. Producing extracellular amylopectins is not a primary diagnostic criterion for caries etiology. Lethality in gnotobiotic animals demonstrates pathogenicity but is not the primary plaque criterion. Intracellular dextrans are synthesized by many plaque bacteria without proving specific causation.
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