Which pair of microorganisms is commonly found in early dental plaque?

Which pair of microorganisms is commonly found in early dental plaque?

• A. Streptococcus mutans and Lactobacillus casei
• B. Streptococcus sanguinis and Actinomyces naeslundii
• C. Porphyromonas gingivalis and Fusobacterium nucleatum
• D. Veillonella parvula and Actinomyces israelii

Answer: (B)

Early dental plaque is built by pioneer colonizers that quickly attach to the tooth surface and to each other, creating the foundation for the biofilm. Streptococcus sanguinis is a classic primary colonizer that readily adheres to the acquired enamel pellicle and forms initial microcolonies. Actinomyces naeslundii also colonizes early, attaching to the tooth surface and integrating into the developing biofilm. Together, they establish the first layer of plaque and set the stage for later colonizers. The other options describe bacteria more typically associated with later stages of plaque development or with disease-associated niches. For example, Streptococcus mutans and Lactobacillus species are strongly linked to caries progression after the biofilm has formed; Porphyromonas gingivalis is a periodontal pathogen associated with disease and tends to appear later in the biofilm, often with Fusobacterium nucleatum acting as a bridge; Veillonella parvula and Actinomyces israelii are not the classic early colonizers of typical dental plaque.

Early dental plaque is built by pioneer colonizers that quickly attach to the tooth surface and to each other, creating the foundation for the biofilm. Streptococcus sanguinis is a classic primary colonizer that readily adheres to the acquired enamel pellicle and forms initial microcolonies. Actinomyces naeslundii also colonizes early, attaching to the tooth surface and integrating into the developing biofilm. Together, they establish the first layer of plaque and set the stage for later colonizers.

The other options describe bacteria more typically associated with later stages of plaque development or with disease-associated niches. For example, Streptococcus mutans and Lactobacillus species are strongly linked to caries progression after the biofilm has formed; Porphyromonas gingivalis is a periodontal pathogen associated with disease and tends to appear later in the biofilm, often with Fusobacterium nucleatum acting as a bridge; Veillonella parvula and Actinomyces israelii are not the classic early colonizers of typical dental plaque.