Oral Microbiology Test

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1 / 60

Which of the following statements on dentoalveolar abscess is true?

a. it is often precipitated by bacteria from the systemic route (anachoresis)

b. it often resolves without antibiotics after adequate drainage.

c. it is frequently implicated as a cause of brain abscess

d. it is a infection of sublingual and submandibular spaces

2 / 60

The main causative agent of Ludwig angina is:?

a. Treponema pallidum

b. Staphylococci

c. Fusobacteria.

d. Streptococcus pneumonia

3 / 60

Caries, all are true except:?

a. Smooth surface caries occur due to streptococcus mutans

b. Fluorides help in reducing caries incidence.

c. Pit and fisssure caries can be prevented by using pit and fissure sealants

d. Lactobacillus is the main causative organism in plaque

4 / 60

Which of the following statements on clinical sign of dental caries is INEXACTE?

a. White-spot lesion.

b. Pseudomembrane (slough)

c. Chalkywhite lesion

d. Roughened and cavitation

5 / 60

How to manage dentoalveolar abscess?

a. Probiotics replacement of cariogenic bacteria

b. Removing source of infection and prescribing antibiotics

c. Reducing cariogenic flora

d. Initial local debridement.

6 / 60

Which of the following statements on dental caries are true?

a. signs of fissure caries can be first detected in dentine

b. approximately 90% of people over 60 years in the West have root surface caries

c. recurrent caries is commonly associated with an existing restoration.

d. fissure caries is commonly seen in the lingual surface of the incisors

7 / 60

Which of the following bacteria that is predominant in chronic periodontitis?

a. Porphyromonas gingivalis

b. Actinomyces viscsus

c. Prevotella intermedia.

d. Streptococcus sanguinis

8 / 60

Which of the following statements on acute necrotizing ulcerative gingivitis is INEXACTE?

a. If untreated, ulcers enlarge and spread to involve marginal

b. The disease may be inherited (autosomal recessive).

c. Commonly associated with poor and neglected oral hygiene

d. Possibly systemic diseases

9 / 60

Main predisposing factors of acute necrotizing ulcerative gingivitis is:?

a. Host factors

b. Severe malnutrition

c. Dental caries

d. Intake of fermentable carbohydrates.

10 / 60

Which of the following statements on streptococci are not true?

a. Can be primarily differentiated by their hemolytic reactions on blood agar

b. mutans group streptococci cause caries

c. Some are Gram-positive and anaerobic

d. Can cause caries in the absence of sucrose

11 / 60

Predisposing factors for acute necrotizing ulcerative gingivitis include INEXACT:?

a. heavy smoking

b. diabetes.

c. severe malnutrition

d. immunodeficiency

12 / 60

Widely accepted theory of dental caries is 😕

a. Proteolytic theory

b. Proteolytic chelation theory

c. Acidogenic theory

d. Autoimmune theory.

13 / 60

Which of the following statements on chronic periodontitis is INEXACTE?

a. Morbidity 70–80%

b. Prevalence and severity decrease with age

c. 95% of all periodontal diseases.

d. Most prevalent disease globally

14 / 60

Which of the following is associated with dental caries?

a. Streptococcus mutans

b. Streptococcus pneumonia

c. Staphylococcus aureus.

d. Lactococcus lactis

15 / 60

Which of the following statements on dentoalveolar infections is INEXACTE?

a. Endogenous oral commensals, usually from apex of a necrotic tooth

b. Pus-producing infections associated with teeth and surrounding supporting structures

c. Clinical presentation depends on virulence of causative microorganisms.

d. Prevalence and severity increase with age

16 / 60

The main difference in true bacteria and mycoplasma is that it does not posses:?

a. A capsule.

b. ATP synthesis

c. Cell wall

d. Flagella

17 / 60

Dentoalveolar abscess is treated by:?

a. Gingivectomy

b. Periodontal flap procedure

c. Drainage through the gingival sulcus or by an external incision.

d. Gingivoplasty

18 / 60

Members of the genus Lactobacillus are normal microflora of the?

a. Hair

b. Skin

c. Nasopharynx.

d. Mouth

19 / 60

An example of a nonspecific chemical barrier to infection is…?

a. cilia in the respiratory tract

b. lysozyme in saliva

c. cytotoxic T cells.

d. unbroken skin

20 / 60

Which of the following statements on clinical sign of chronic periodontitis is INEXACTE?

a. Inflamed, red, shiny and bleeding gingivae.

b. Tooth mobility and migration

c. Irregular alveolar bone loss around teeth

d. Gross gingival inflammation, fibrosis and some shrinkage

21 / 60

True about caries, all EXCEPT:?

a. Microorganisms play the most essential role

b. Demineralization of enamel.

c. Chronic endogenous infection

d. Not due to microorganisms

22 / 60

Which of the following vaccines would you recommend to your new female dental surgery assistant starting work with you?

a. Hepatitis B immunoglobulin

b. Hepatitis C.

c. Hepatitis A

d. Measles–mumps–rubella (MMR)

23 / 60

Which of the following statements on the natural history of periodontal disease is INEXACT?

a. Gram-positive cocci predominate in healthy gingival crevice

b. facultative anaerobes predominate in gingivitis.

c. Gram-negative anaerobes predominate in chronic periodontitis

d. the proportion of Gram positive rods decreases to nearly 5% in chronic marginal gingivitis

24 / 60

The human body provides a favorable habitat for microorganisms. Which of the following does not contribute to this favorable habitat?

a. Stable temperature

b. Relatively stable pH.

c. Constant source of nourishment

d. Low levels of moisture

25 / 60

យើងប្រើ Microscope optique ពិនិត្យក្រោយដាក់ព៌ណ ៖ អាចពិនិត្យយ៉ាងច្បាស់លាស់ពីរូបរាង និង ចំណុចសំខាន់ៗ ។ អាចដឹងពីរចនាសម្ព័ន្ធ អាចដឹងពី?

a. បាក់តេរី Grams positif ឬ Grams négatif

b. បាក់តេរី Grams positif

c. បាក់តេរី Grams négatif

d. ពីចលនា (mobilité ) រូបរាង ( forme )

26 / 60

បាក់តេរី Doderlein អាចរស់នៅក្នុង milieu?

a. milieu acide + base

b. milieu alcalin

c. milieu acide

d. milieu base

27 / 60

ដើម្បីរស់ បាក់តេរីការចំណីអាហារប៉ុន្មានភាគរយ នៃ Ration totale សំរាប់ការរស់នៅក្នុងធម្មជាតិ?

a. 1/600

b. 1/500

c. 1/400

d. 1/300

28 / 60

គេប្រើl Microscope optique ពិនិត្យក្នុងសភាពរស់នៅ(á l ‘état frais) គឺសិក្សាពិនិត្យពី 😕

a. បាក់តេរី Grams négatif

b. បាក់តេរី Grams positif

c. រូបរាង ( forme )

d. រូបរាង ( forme ) និងពីចលនា (mobilité ) ។

29 / 60

គេប្រើ Microscope électronique តែក្នុងការស្រាវជ្រាវ ។ គេអាចមើលឃើញ នូវរចនាសម្ព័ន្ធ និង ចំណុចដ៏តូចៗ ។ ពិសេសគេ ពិនិត្យ 😕

a. បាក់តេរី Grams positif ឬ Grams négatif

b. បាក់តេរី Grams positif

c. ដោយការកាត់- ពុះខ្លួនបាក់តេរី

d. ពីចលនា (mobilité ) រូបរាង ( forme )

30 / 60

សេចក្តីត្រូវការពិសេស ( besoins srécifique ) របស់បាក់តេរី?

a. ATP , Glucose -6-Phosphate , glucose and Vitamine, base pyruvique , acide amine ត្រឹមត្រូវ

b. Vitamine, base pyruvique , acide amine

c. ATP , Glucose -6-Phosphate , glucose

d. Acides amines , Base pyuvique , ATP

31 / 60

បាក់តេរីប្រភេទ Mésophile អាចរស់នៅក្នុងសីតុណ្ហភាព?

a. 10-15 ˚C

b. 10-20 ˚C

c. 40-50 ˚C

d. 20-40 ˚C

32 / 60

virusមានរូបរាងមូលដ្ឋានបីបែប?

a. Helical, Icosahedral, Complex

b. Complex Helical,Bacillus(rods)

c. Icosa,hedral, Complex, Coccus (sphere)

d. Helical, Icosahedral ,Spirillum (spirals )

33 / 60

នៅក្នុង condition physico-chimique de la croissance របស់បាក់តេរីក្នុងល័ក្ខខណ្ឌ័ Perssions partielles d’oxygène គេបែងចែកបាក់តេរីជាច្រើនប្រភេទ?

a. Aérobies-anaérobie facultative

b. Aérobies strictes , Micro-aérophiles, anaérobies stricte

c. Mésophile + Micro-aérophiles,anaérobies stricte

d. Aérobies-anaérobie facultative and érobies strictes , Micro-aérophiles, anaérobies stricte

34 / 60

ក្នុងការជ្រាបចូលនៃចំណីអាហាររបស់បាក់តេរី perméase មានប៉ុន្មានប្រភេទ ?

a. 6ប្រភេទ

b. 4ប្រភេទ

c. 5ប្រភេទ

d. 3ប្រភេទ

35 / 60

សេចក្តីត្រូវការ (Les besoins nutritifs ) របស់បាក់តេរីផ្នែករូបធាតុក្នុងបរិមាណច្រើនមាន?

a. Carbon(C). Hydrogène(H) .Azote (N) .oxygène(O)

b. phosphore (P) Fer (Fe) . Ca . Mg. K

c. Carbon(C). Hydrogène(H).Azote(N) +O2 . phosphore (P) Fer (Fe)

d. Ca . Mg. K

36 / 60

អ្វីទៅដែលហៅថា Ration totale របស់បាក់តេរី?

a. Ration de croissance and បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី

b. Ration de croissance +បរិមាណចំណីអាហារសំរាប់លូតលាស់ដល់បាក់តេរី

c. Ration d’entretien and បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី

d. Ration d’entretien, បរិមាណចំណីអាហារទ្រទ្រង់បាក់តេរី and Ration de croissane

37 / 60

Paroi bactérie gram positif មានលក្ខណៈ?

a. ស្តើង មិនជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

b. ក្រាស់ អាចជ្រាបអាល់កុល bactérie ពណ៍ស្វាយ

c. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ស្វាយ

d. ក្រាស់ មិនអាចជ្រាបអាល់កុល ហើយ bactérie ពណ៍ក្រហម

38 / 60

The virulence of Porphyromonas gingivalis is partly due to?

a. Hyaluronic acid

b. Proteases, haemolysin and collagenase

c. Cytotoxins

d. Adhesins

39 / 60

Fusobacterium Nucleatum 😕

a. Produce proinflammatory cytokines and up-regulating the inflammatory response

b. Non capsulate diplococci

c. Gram-positive, strictly anaerobic

d. Isolated from monomicrobial infections

40 / 60

Several infections occur in the oral cavity that are of relevance to the dental team. Which of the following infections does virus cause?

a. Acute necrotizing ulcerative gingivitis

b. Lateral periodontal abcess

c. Pericoronitis

d. Herpetic stomatitis

41 / 60

Certain strains of Streptococcus mutans?

a. Cause dental caries by the production of lactic and other acids, from fermentation of sugars

b. Extracellular glucan production.

c. Cause of periodontal disease by the production of lactic and acids from fermentation of sugars

d. Are cause of infective meningitides

42 / 60

Toxins or enzymes which are not produced by streptococcus pyogenes?

a. Streptokinase

b. Phosphate

c. Hyaluronides

d. Hemolysin

43 / 60

Which of the following statements on Prevotella Intermedia are true:?

a. Microaerophilic

b. Implicated in dental Caries in association with Aggregatibacter actino- mycetemcomitans.

c. Implicated in periodontal disease in association with P. gingivalis

d. Black pigmented Gram-positive

44 / 60

Which of the following organisms is most likely to be implicated in dental caries?

a. Escherichia coli

b. Staphylococcus epidermidis

c. Staphylococcus aureus

d. Streptococcus sorbinus

45 / 60

Mumps virus is belonging to?

a. Orthomyxoviridae

b. Paramyxoviridae

c. None of these

d. Retroviriae

46 / 60

The organisms most commonly associated with root caries are ?

a. Actinomyces viscosus

b. Fusobacterium Nucleatum

c. Staphylococcus aureus

d. Porphyromonas gingivalis

47 / 60

Diseases are always found in oral cavity, except 😕

a. Syphilis

b. Gonococci

c. Tuberculosis

d. Typhoid fever

48 / 60

Microorganisms in oral tissue can cause 😕

a. Local infection

b. Only local infection

c. Both, local and systemic infection

d. Systemic infection

49 / 60

Biofilm infection is usually found in sites of primary and secondary infection except:?

a. Mouth

b. Artificial hip implant

c. Genital infection

d. Subvenous catheter

50 / 60

On tooth surface, bacteria that participate actively in adhesion of primary colonizers?

a. Staphylococcus stains

b. Streptococcus stains

c. Pseudomonas stains

d. Enterococcus stains

51 / 60

Antibiotic which is common use to treat anaerobic bacteria 😕

a. Colistin

b. Gentamicin

c. Metronidazole

d. Vancomycin

52 / 60

Antimicrobial against Porphyromonas gingivalis is 😕

a. Erythromycin

b. Kanamycin

c. Vancomycin

d. Metronidazole

53 / 60

A bacterium from buccal mucosa that can cause lung infection in chronic obstructive pulmonary infections in cystic fibrosis patients is:?

a. Pseudomonas aeruginosa

b. Klebsiella pneumoniae

c. Mycobacterium tuberculosis

d. Streptococcus pneumoniae

54 / 60

Principal Cocci Gram positive bacteria found in oral cavity:?

a. Peptostreptococcus

b. Veillonella

c. Neisseria

d. Moraxella

55 / 60

Strategy to control of nutrients in oral biofilm:?

a. Stimulate base production

b. Fluoride

c. Antimicrobial agents

d. Inhibition of key microbial enzyme

56 / 60

Infections of the mucosa are more usually associated with transient oral bacteria, which one is incorrect?

a. Pseudomonas

b. Helicobacter

c. Enterococcus

d. Staphylococcus

57 / 60

Steps in order for biofilm formation:?

a. Adhesion, colonization, coadhesion , maturation and detachment

b. Coadhesion , adhesion, colonization, maturation and detachment

c. Colonization , adhesion, coadhesion , maturation and detachment

d. Maturation and detachment, adhesion, colonization, coadhesion

58 / 60

Principal Rods Gram positive bacteria found in oral cavity:?

a. Actinomyces

b. Prevotella

c. Simonsiella

d. Eikenella

59 / 60

Pathway in order of pathogenesis of oral infection:?

a. Pus formation- Entry of bacteria into soft tissue wall or trauma to the orifice – Formation of infiltrate- Destruction of connective tissues- Decrease tissue resistance and increase number of bacteria with virulence

b. Decrease tissue resistance and increase number of bacteria with virulence- Entry of bacteria into soft tissue wall or trauma to the orifice – Formation of infiltrate- Destruction of connective tissues- Pus formation

c. Entry of bacteria into soft tissue wall or trauma to the orifice – Formation of infiltrate- Destruction of connective tissues- Pus formation- Decrease tissue resistance and increase number of bacteria with virulence

d. Entry of bacteria into soft tissue wall or trauma to the orifice – Pus formation- Formation of infiltrate – Destruction of connective tissues – Decrease tissue resistance and increase number of bacteria with virulence

60 / 60

A bacterium that is usually found in tongue 😕

a. Streptococcus pneumoniae

b. Streptococcus mitis

c. Clostridium difficile

d. Staphylococcus epidemidis

Your score is

The average score is 86%

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត