Question 1

Members of the normal oral flora can cause:

Accepted Answer

A) tetanus. 
B) measles. 
C) actinomycosis. 
D) mumps. 
A) tetanus. 
B) measles. 
C) actinomycosis. 
D) mumps. C

Question 2

How soon do bacteria begin to reattach to the tooth surface and start forming plaque again after a prophy?

Accepted Answer

A) Within seconds 
B) 12 hours 
C) One day 
D) One week 
A) Within seconds 
B) 12 hours 
C) One day 
D) One week A

Question 3

What causes the critical pH to be reached during formation of dental caries?

Accepted Answer

A) The saliva stagnates and putrefies, producing a large amount of acid. 
B) The bacteria in saliva cause an immune response to occur, lowering the pH in the mouth. 
C) Lysozyme in saliva lyses bacteria, causing the release of internal chemicals from the dead bacterial cells, which lower the pH in the mouth. 
D) Plaque bacteria convert dietary sugar into acids. 
A) The saliva stagnates and putrefies, producing a large amount of acid. 
B) The bacteria in saliva cause an immune response to occur, lowering the pH in the mouth. 
C) Lysozyme in saliva lyses bacteria, causing the release of internal chemicals from the dead bacterial cells, which lower the pH in the mouth. 
D) Plaque bacteria convert dietary sugar into acids. D

Question 4

The same bacteria that cause dental caries also cause periodontal diseases.

Accepted Answer

A) True 
 B)False

Question 5

What actually destroys the tooth enamel in dental caries?

Accepted Answer

A) Amino acids in the diet 
B) Acids made by bacteria 
C) Fats in saliva 
D) Nucleic acids 
A) Amino acids in the diet 
B) Acids made by bacteria 
C) Fats in saliva 
D) Nucleic acids

Question 6

Which of the following bacteria is the most important in causing the progression of a carious lesion after the lesion has been initiated?

Accepted Answer

A) Streptococcus sanguis 
B) Lactobacillus acidophilus 
C) Porphyromonas gingivalis 
D) Prevotella intermedia 
A) Streptococcus sanguis 
B) Lactobacillus acidophilus 
C) Porphyromonas gingivalis 
D) Prevotella intermedia

Question 7

Most of the bacteria important in causing periodontal diseases are:

Accepted Answer

A) in the group called Mutans streptococci. 
B) gram-positive. 
C) gram-negative. 
D) also important causes of strep throat. 
A) in the group called Mutans streptococci. 
B) gram-positive. 
C) gram-negative. 
D) also important causes of strep throat.

Question 8

Plaque causes periodontal diseases.

Accepted Answer

A) True 
 B)False

Question 9

Dental plaque is best defined as:

Accepted Answer

A) a microbial mass. 
B) composed of pieces of food that have stuck to the teeth. 
C) mineralized proteins. 
D) dried saliva. 
A) a microbial mass. 
B) composed of pieces of food that have stuck to the teeth. 
C) mineralized proteins. 
D) dried saliva.

Question 10

Which of the following periodontal diseases occurs in persons with normal body defense mechanisms?

Accepted Answer

A) Chronic 
B) Rapidly progressive 
C) Prepubertal 
D) Juvenile 
A) Chronic 
B) Rapidly progressive 
C) Prepubertal 
D) Juvenile

Question 11

Simple or acute gingivitis involves the bone in which the teeth are set.

Accepted Answer

A) True 
 B)False

Question 12

Further progression of a periapical infection may cause:

Accepted Answer

A) strep throat. 
B) cellulitis. 
C) pulpitis. 
D) enamel caries. 
A) strep throat. 
B) cellulitis. 
C) pulpitis. 
D) enamel caries.

Question 13

The slightest trauma to the mouth that results in bleeding can lead to:

Accepted Answer

A) dental caries. 
B) transient bacteremia. 
C) chronic periodontitis. 
D) necrotizing ulcerative gingivitis. 
A) dental caries. 
B) transient bacteremia. 
C) chronic periodontitis. 
D) necrotizing ulcerative gingivitis.

Question 14

How many different genera of bacteria may be isolated from human mouths?

Accepted Answer

A) At least 42 
B) 100 
C) 100 million 
D) 200 billion 
A) At least 42 
B) 100 
C) 100 million 
D) 200 billion

Question 15

Removing dental plaque and instituting good oral hygiene will reverse which of the following diseases?

Accepted Answer

A) Gingivitis 
B) Periodontitis 
C) Dental caries in dentin 
D) Strep throat 
A) Gingivitis 
B) Periodontitis 
C) Dental caries in dentin 
D) Strep throat

Question 16

What is the most caries-conductive component of our diet?

Accepted Answer

A) Protein 
B) Sucrose 
C) Fatty acid 
D) Cellulose 
A) Protein 
B) Sucrose 
C) Fatty acid 
D) Cellulose

Question 17

Oral biofilm (dental plaque) is:

Accepted Answer

A) accumulated food debris that occurs in the absence of oral hygiene. 
B) an accumulation of glycoproteins from saliva. 
C) a microbial mass that accumulates in the absence of oral hygiene. 
D) an aggregation of white blood cells that come from the gingival sulcus. 
A) accumulated food debris that occurs in the absence of oral hygiene. 
B) an accumulation of glycoproteins from saliva. 
C) a microbial mass that accumulates in the absence of oral hygiene. 
D) an aggregation of white blood cells that come from the gingival sulcus.

Question 18

The pellicle is best defined as:

Accepted Answer

A) part of the outer membrane of gram-negative bacterial cells. 
B) a proteinaceous layer that coats the teeth exposed to saliva. 
C) that part of the bacterial gene that codes for acid production. 
D) the protein coat of viruses. 
A) part of the outer membrane of gram-negative bacterial cells. 
B) a proteinaceous layer that coats the teeth exposed to saliva. 
C) that part of the bacterial gene that codes for acid production. 
D) the protein coat of viruses.

Question 19

The best approach to preventing periodontal disease is to ________ and _________.

Accepted Answer

brush, flo

Question 20

The three mechanisms of action of topical fluoride are (1) inhibiting bacterial metabolism after diffusing into the bacteria as hydrogen fluoride, (2) inhibiting demineralization when present at the crystal surfaces of teeth during an acid challenge, and (3):

Accepted Answer

A) enhancing remineralization. 
B) stopping plaque formation. 
C) killing all oral bacteria. 
D) enhancing saliva flow. 
A) enhancing remineralization. 
B) stopping plaque formation. 
C) killing all oral bacteria. 
D) enhancing saliva flow.

Exam 5: Oral Microbiology and Plaque-Associated Diseases

Members of the normal oral flora can cause:

How soon do bacteria begin to reattach to the tooth surface and start forming plaque again after a prophy?

What causes the critical pH to be reached during formation of dental caries?

The same bacteria that cause dental caries also cause periodontal diseases.

What actually destroys the tooth enamel in dental caries?

Which of the following bacteria is the most important in causing the progression of a carious lesion after the lesion has been initiated?

Most of the bacteria important in causing periodontal diseases are:

Plaque causes periodontal diseases.

Dental plaque is best defined as:

Which of the following periodontal diseases occurs in persons with normal body defense mechanisms?

Simple or acute gingivitis involves the bone in which the teeth are set.

Further progression of a periapical infection may cause:

The slightest trauma to the mouth that results in bleeding can lead to:

How many different genera of bacteria may be isolated from human mouths?

Removing dental plaque and instituting good oral hygiene will reverse which of the following diseases?

What is the most caries-conductive component of our diet?

Oral biofilm (dental plaque) is:

The pellicle is best defined as:

The best approach to preventing periodontal disease is to ________ and _________.

The three mechanisms of action of topical fluoride are (1) inhibiting bacterial metabolism after diffusing into the bacteria as hydrogen fluoride, (2) inhibiting demineralization when present at the crystal surfaces of teeth during an acid challenge, and (3):

Scope of Microbiology and Infection Control

Characteristics of Microorganisms

Development of Infectious Diseases

Emerging Diseases

Bloodborne Pathogens

Oral and Respiratory Diseases

Infection Control Rationale and Regulations

Immunization

Hand Hygiene

Personal Protective Equipment

Instrument Processing

Surface and Equipment Asepsis

Dental Unit Water Asepsis and Air Quality

Aseptic Techniques

Laboratory and Radiographic Asepsis

Waste Management

Preventing Sharps Injuries

A Clinical Asepsis Protocol

General Office Safety and Asepsis

Greener Infection Control

Cross-Contamination Between Work and Home

About the Occupational Safety and Health Administration

Osha Inspections

Management of the Office Safety Program

Managing Chemicals Safely

Employee Fire Prevention and Emergency Action Plans

Infection Control Concerns During Remodeling or Construction

Filters

The best approach to preventing periodontal disease is to and _.