Types of Caries and their Causative Organisms

Dental Caries as described earlier is an irreversible microbial disease of the calcified tissues of the teeth, characterized by de-mineralization of the inorganic portion and destruction of the organic substance of the tooth.

As you have seen in the Post about Dental Caries there are 4 Types of Caries in particular based on the location where they are seen on the tooth and the causative organisms for each type also differ which is given below categorized under each type.

Micro organisms responsible for caries

Types of Bacteria causing Dental Caries: 

1) Pit & fissure Caries

  • S mutans
  • S sanguis
  • Other streptococci
  • Lactobacillus sp
  • Actinomyces sp

2) Smooth surface Caries

  • S mutans
  • S salivarius

3) Root surface

  • A viscosus
  • A naeslundi
  • Othr filamentous rods
  • S mutans
  • S sanguis
  • S salivarius

4) Deep dentinal caries

  • Lactobacillus sp
  • A naeslundi
  • A viscosus
  • Other filamentous rods
  • S mutans

Most of these bacteria are present in the oral cavity even when there is not dental caries, in case of improper brushing and poor oral hygiene maintainanxe these bacteria settle down in the damaged surface of the tooth. The bacteria causing different types of caries differs as the location is different and the conditions as well, 

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