Infections of the Mouth

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Questions and Answers

What is the primary consequence of dental plaque accumulation on the teeth?

  • Infection of soft tissues and bones (correct)
  • Enhancement of tooth enamel strength
  • Reduction of oral flora diversity
  • Increased tooth sensitivity

How does sugar contribute to tooth decay?

  • It gets converted into acids by bacteria (correct)
  • It eliminates oral bacteria
  • It increases saliva production
  • It strengthens tooth enamel

What role does saliva play in the health of teeth?

  • It increases bacterial growth
  • It has no significant effect on tooth health
  • It neutralizes acids immediately after meals
  • It provides essential minerals to replace those lost (correct)

Which of the following bacteria is NOT mentioned as part of the normal oral flora?

<p>Escherichia coli (C)</p> Signup and view all the answers

What can happen if more minerals are lost than replaced in tooth enamel?

<p>A cavity may form (B)</p> Signup and view all the answers

What is dental caries commonly known as?

<p>Tooth decay (B)</p> Signup and view all the answers

What is considered the most common infectious disease among humans?

<p>Dental caries (A)</p> Signup and view all the answers

Which component of plaque primarily contributes to the damage of teeth?

<p>Anaerobic bacteria (B)</p> Signup and view all the answers

What happens to tooth enamel when it is exposed to acid from plaque?

<p>It becomes more susceptible to decay (A)</p> Signup and view all the answers

Which practice helps in reducing the risk of tooth decay?

<p>Regularly brushing and flossing (A)</p> Signup and view all the answers

What leads to a toothache?

<p>Infection in the pulp of the tooth (B)</p> Signup and view all the answers

Which species is primarily responsible for dental caries?

<p>Streptococcus mutans (C)</p> Signup and view all the answers

What is the initial stage of periodontal disease?

<p>Gingivitis (A)</p> Signup and view all the answers

Which bacteria are known to cause bad breath due to their metabolic byproducts?

<p>Fusobacterium and Porphyromonas gingivalis (B)</p> Signup and view all the answers

What substance do oral alpha-hemolytic viridans streptococci produce in the presence of sugars?

<p>Fructans and glucans (A)</p> Signup and view all the answers

How is periodontal disease best prevented?

<p>Daily brushing and flossing (D)</p> Signup and view all the answers

What is the best way to remove calculus from teeth?

<p>Mechanical procedures by a dentist (D)</p> Signup and view all the answers

What condition can result from mumps infection?

<p>Meningitis (A)</p> Signup and view all the answers

What agent is commonly used in the United States to help prevent tooth demineralization?

<p>Fluoride (B)</p> Signup and view all the answers

What type of virus is responsible for mumps?

<p>Paramyxovirus (C)</p> Signup and view all the answers

The pulp of the tooth contains nerve endings and blood vessels.

<p>True (A)</p> Signup and view all the answers

Sucrose is responsible for the formation of bacteria-favorable plaque biofilm.

<p>True (A)</p> Signup and view all the answers

Streptococcus sobrinus is a prominent agent in the development of periodontal disease.

<p>False (B)</p> Signup and view all the answers

Bad breath can result from metabolic byproducts of anaerobic bacteria.

<p>True (A)</p> Signup and view all the answers

Fluoride is added to water to decrease the hardness of tooth enamel.

<p>False (B)</p> Signup and view all the answers

Periodontal disease is reversible in its initial stages with the right dental hygiene.

<p>True (A)</p> Signup and view all the answers

Mumps is a viral infection that can lead to neurological damage.

<p>True (A)</p> Signup and view all the answers

Probiotics have no effect on the levels of S.mutans in the mouth.

<p>False (B)</p> Signup and view all the answers

Plaque can be removed by brushing when it becomes calcified to form calculus.

<p>False (B)</p> Signup and view all the answers

The MMR vaccine is effective in preventing mumps infection.

<p>True (A)</p> Signup and view all the answers

The human mouth is home to more than 500 known species of microorganisms.

<p>True (A)</p> Signup and view all the answers

Dental plaque is a beneficial biofilm that prevents tooth decay.

<p>False (B)</p> Signup and view all the answers

Tooth decay is the result of bacteria converting sugars into acids.

<p>True (A)</p> Signup and view all the answers

Saliva contains minerals that help to restore tooth enamel after it has been damaged.

<p>True (A)</p> Signup and view all the answers

A cavity forms only when enamel is fully preserved.

<p>False (B)</p> Signup and view all the answers

Cutting out between-meal snacks can help in the fight against tooth decay.

<p>True (A)</p> Signup and view all the answers

The dentine layer become vulnerable to bacteria only when tooth enamel is healthy.

<p>False (B)</p> Signup and view all the answers

Toothaches can occur when decay reaches the sensitive pulp area of the tooth.

<p>True (A)</p> Signup and view all the answers

Regular brushing and flossing can help manage the bacterial load in the mouth.

<p>True (A)</p> Signup and view all the answers

Dental caries is considered the second most common infectious disease of humans.

<p>False (B)</p> Signup and view all the answers

Flashcards

Oral Microbes

A large variety of microorganisms, including bacteria (Streptococcus, Neisseria, etc.), fungi (Candida albicans), and protozoa (Trichomonas tenax), found in the mouth.

Dental Plaque

A biofilm of bacteria that forms on teeth, providing a habitat for microbes.

Anaerobic Bacteria

Bacteria that thrive in environments with no oxygen.

Dental Caries

Tooth decay caused by bacteria turning sugars into acids that erode tooth enamel.

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Tooth Enamel

The hard, outer layer of a tooth that protects it.

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Cavity

A hole in a tooth caused by the breakdown of tooth enamel and dentin by bacteria.

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Saliva

Fluid in the mouth containing minerals that can help repair tooth enamel.

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Dental Plaque Formation

Bacteria accumulate on teeth, forming a biofilm.

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Microbes and Teeth

Bacteria in the mouth can harm the teeth through plaque formation, leading to dental caries.

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Common Infectious Disease

Dental caries is the most common infectious disease affecting humans.

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Dental Caries Cause

Oral alpha-hemolytic viridans streptococci, like Streptococcus mutans, are the main cause of tooth decay.

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Plaque Biofilm Formation

Sugary substances like sucrose allow bacteria to create sticky layers (biofilms) on teeth.

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Periodontal Disease Cause

A combination of bacteria, especially anaerobes like Fusobacterium and Porphyromonas gingivalis, cause periodontal disease.

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Gingivitis

Inflammation of the gums (gingiva), often due to plaque buildup.

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Toothache

Pain in teeth, often resulting from infection in the tooth's pulp.

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Periodontal Pockets

Spaces between the gums and teeth that deepen with inflammation, increasing risk of loosening or loss of teeth.

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Calculus

Hardened plaque that forms on teeth.

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Mumps Virus Type

Paramyxovirus, an RNA virus that infects the salivary glands.

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Mumps Infection Symptoms

Fever, malaise, and inflammation of the salivary glands (especially parotid glands),.

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Mumps Prevention

The MMR vaccine is the best way to prevent mumps.

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Mouth Microbes

The human mouth contains many microorganisms like bacteria, fungi, and protozoa, collectively known as normal flora.

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Saliva's Role

Saliva contains minerals that help repair tooth enamel, counteracting the effects of acid.

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Fight Against Plaque

Limiting sugary snacks and regularly brushing/flossing helps reduce plaque buildup.

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Dentine

The layer under the enamel, sensitive to decay.

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What causes toothache?

Toothache is pain caused by infection in the pulp, the inner part of a tooth containing blood vessels and nerves.

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What is the main culprit in tooth decay?

Streptococcus mutans, a type of bacteria found in the mouth, is the main cause of dental caries (tooth decay).

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What are fructans and glucans?

Fructans and glucans are sticky polymers made by bacteria from sugar, which form plaque on teeth.

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How does plaque lead to tooth decay?

The bacteria in plaque ferment sugar, producing acid that erodes tooth enamel, leading to cavities.

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What is periodontal disease?

Periodontal disease is an infection of the gums and bone surrounding the teeth, caused by a community of bacteria.

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What happens in the initial stage of periodontal disease?

Gingivitis, inflammation of the gums, is the first stage of periodontal disease, causing swelling, redness, and bleeding.

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What are obligate anaerobes?

Obligate anaerobes are bacteria that need an environment without oxygen to survive, like some bacteria in periodontal disease.

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How can periodontal disease be prevented?

Regular brushing and flossing are the best ways to prevent periodontal disease by removing plaque buildup.

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What is the Mumps virus?

The Mumps virus is an RNA virus that causes swelling of the salivary glands, especially the parotid glands.

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What is the best way to prevent mumps?

The MMR vaccine, which includes measles, mumps, and rubella, is the best way to prevent mumps.

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Study Notes

Oral Microbes and Infections

  • Human mouth harbors a vast array of microbes, exceeding 500 known species, including bacteria (Streptococcus, Neisseria, Fusobacterium, Corynebacterium), fungi (Candida albicans), and protozoa (Trichomonas tenax, Entamoeba gingivalis).
  • Bacteria form dental plaque, a biofilm on teeth. Anaerobic bacteria in plaque can damage surrounding tissues and bones.
  • Sugary substances in the mouth lead to acid production by some oral streptococci, and this can erode teeth.

Dental Caries (Tooth Decay)

  • Dental caries is the most prevalent human infectious disease.
  • Bacteria in plaque (biofilm) thrive on sugars in food and drink.
  • Bacteria convert sugars into acids, which erode tooth enamel.
  • Saliva contains minerals that remineralize teeth, but if acid erosion exceeds remineralization, cavities form.
  • Bacteria can penetrate into the deeper layers of teeth (pulp), causing toothaches.
  • Prevention includes reducing sugary foods/drinks, regular brushing, and flossing.
  • Fluoride in drinking water strengthens enamel and helps remineralize.
  • Probiotics and vaccines are being developed as additional preventive strategies.
  • The main cause of dental caries is alpha-hemolytic viridans streptococci, such as Streptococcus mutans. These bacteria form plaque biofilms, and produce acids that damage teeth.

Periodontal Disease

  • Periodontal disease is a common infection, affecting nearly everyone by age 45.
  • It's a complex condition caused by specific microbial communities in dental plaque biofilms, including anaerobic bacteria like Fusobacterium, and Porphyromonas gingivalis.
  • These anaerobic, gram-negative bacteria cause bad breath.
  • The disease starts with gingivitis (inflammation of the gums).
  • Untreated gingivitis can progress to periodontitis, affecting deeper tissues and bones.
  • Deepening pockets around teeth are common in periodontitis, and teeth can become loose and fall out.
  • Calculus (hardened plaque) contributes to inflammation and disease progression.
  • The best prevention is regular and thorough plaque removal via brushing and flossing.
  • Treatment involves cleaning calculus and maintaining good oral hygiene.
  • Surgical intervention may be necessary to reduce pocket depths.

Infection of Salivary Glands: Mumps

  • The mumps virus (paramyxovirus) infects salivary glands, especially the parotid glands, causing inflammation (Parotitis), fever, and malaise.
  • The virus is spread through salivary and respiratory secretions.
  • Humans are the only reservoir for this RNA, enveloped virus.
  • Prevention: MMR vaccine (live, attenuated).
  • Complications can include meningitis and neurological damage.

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