dental caries

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Author:
shan_kameran
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98348
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dental caries
Updated:
2011-08-25 08:02:26
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dental caries
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Description:
pathology/ lec. 2
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  1. DENTLA CARIES:
    is a microbial disease of the calcified tissues of the tooth, characterized by demineralization of the inorganic portion and destruction of it's organic structures.
  2. what are the theories that explain the process of dental caries?
    • 1. acidogentic theory.
    • 2. proteolytic theory.
    • 3. proteolytic chelation theory.
  3. A) ACIDOGENTIC THEORY:
    also known as "Miller's chemicoparasitic theory".

    (acids formed due to the fermentation of diatery carbohydrates by oral bacteria leads to progressive decalcification of tooth structure with subsequent disintegration of organic matrix)
  4. what are the factors that influence the process of tooth destruction in the process of dental caries? according to miller (acidogenic theory)
    • 1. diatery carbohydrates.
    • 2. microorganisms.
    • 3. acids.
    • 4. dental plaque.
  5. WHAT IS THE ROLE OF CARBOHYDATES (MILLER'S OR ACIDOGENIC THEORY)
    • numerous epidemiological studies have shown that the fermentable fermentable dietary carbohydrates play an important role in the causation of caries.
    • especially the readily fermentable types of carbohydrates, e.g. glucose, sucrose and fructose, etc.
    • among them sucrose is implicated to be the most potent one.
    • these sugars are easily and rapidly fermented by cariogenic bacteria in the O.C. to produce acids at or near the tooth surface and cause dissolution of the hydroxyapetite crystals of the enamel followed by the dentin.
  6. WHAT IS THE ROLE OF MICROORGANISMS (MILLER THEORY)?
    • a large number of M.O play their individual role on the developement of dental caries and among them the most important one is the streptococcus mutans. beside it other streptococci which are cariogenic, include S. sanguis, S. milleri, S. mitior, S. salivarius, peptostreptococcus.
    • the actinomycotic group of organisms namely the actinomyces israelii, actinomyces viscosus and actinomyces nasulandii, etc.

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