Therories of caries 1/12/17 Flashcards

1
Q

What is the proper definition for Dental caries lesions?

A

-A multifactorial process of demineralization and concurrent remineralization, and are often reversible

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2
Q

Where can dental caries occur?

A
  • Enamel
  • Dentin
  • Cementum (Root caries)
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3
Q

What can occur if the biofilm (plaque) is left undisturbed for a period of time on any tooth surface?

A

-Caries lesion

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4
Q

What pH does enamel begin to demineralize?

A

-5.5

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5
Q

T/F

Dental plaque is considered a biofilm

A

True

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6
Q

What was the surgical model of fixing dental caries?

A

-Drill and Fill

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7
Q

What is the medical model of dental caries?

A

Caries lesions are treated by elimination or reduction of risk factors

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8
Q

What are the two most common bacteria in causing bacteria?

A
  • Streptococcus mutans
  • Lactobacilli
  • S. sobrinus
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9
Q

What three things does the multifactorial model of the caries process need?

A
  • Agent
  • Environment
  • Host
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10
Q

What is the agents in the multifactorial model?

A

-S. Mutans, S. sobtinus, Lactobacilii and other pathogens cause plaque biofilm

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11
Q

What are the host factors in the multifactorial model of the caries process?

A
  • Tooth anatomy
  • Saliva quantity
  • Saliva quality and buffering capacity
  • Immune responses (systemic disease)
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12
Q

What is in the environment of the multifactorial model of the caries process?

A

-Dietary fermentable carbohydrates

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13
Q

T/F

Class I caries can occur on the side of the tooth as long as it is part of the pit or fissures.

A

True

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14
Q

T/F

Other non-cariogenic bacteria can become cariogenic for short periods of time under certain conditions.

A

True

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15
Q

Strep Mutans is a gram + or a gram - bacteria.

A

Gram +

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16
Q

What does strep mutans do to cause caries?

A

-Metabolizes sucrose to lactic acid

17
Q

What is the mineral and water component of enamel?

A
  • 95% mineral

- 5% water

18
Q

How are the enamel crystals arranged?

A

-Rod and inter-rod enamel

19
Q

What makes enamel dynamic?

A

-It remineralizes and demineralizes

20
Q

What is the origin of enamel?

A

-Ectoderm

21
Q

What is the origin of dentin?

A

-Mesoderm

22
Q

What is the percentages of inorganic, organic, and water in dentin?

A
  • 75% inorganic
  • 20% organic
  • 5% water
23
Q

When does primary dentin form?

A

Before eruption

24
Q

When does secondary dentin form?

A

-Forms through root formation

25
Q

When does tertiary dentin form?

A

-In response to stimuli from the bi-products of bacterial invasion in advance of the bacteria