Oral Microbiology Test

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1 / 60

Turbid dentin in carious tooth is all EXCEPT:?

a. Zone that need not be removed before restoration.

b. Zone which cannot be remineralised

c. Zone in which collagen is irreversibly denatured

d. Zone of bacterial invasion

2 / 60

How to manage acute necrotizing ulcerative gingivitis?

a. Initial local debridement by ultrasonic scaling

b. Institute surgical drainage.

c. Reducing cariogenic flora

d. Tetracycline 250 mg 3 times/day for 4 weeks

3 / 60

Which of the following statements on dental caries are true?

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

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

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

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

4 / 60

How to manage dentoalveolar abscess?

a. Removing source of infection and prescribing antibiotics

b. Reducing cariogenic flora

c. Initial local debridement.

d. Probiotics replacement of cariogenic bacteria

5 / 60

Which of the following statements on prevention of dental caries is INEXACTE?

a. Stopping or reducing between-meal consumption of carbohydrates

b. Plaque-free by routine oral hygiene measures.

c. Increasing cariogenic flora

d. Probiotics replacement of cariogenic bacteria

6 / 60

Probiotics exhibit all BUT the following characteristics:?

a. Remain viable for a long time

b. Nontoxic and nonpathogenic to host

c. Have beneficial effect on host.

d. Mimic antibiotics

7 / 60

Which of the following statements on streptococci are not true?

a. mutans group streptococci cause caries

b. Can cause caries in the absence of sucrose

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

d. Some are Gram-positive and anaerobic

8 / 60

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

a. Measles–mumps–rubella (MMR)

b. Hepatitis A

c. Hepatitis B immunoglobulin

d. Hepatitis C.

9 / 60

Which of the following statements on aggressive periodontitis is EXACTE?

a. 95% of all periodontal diseases.

b. Prevalence and severity decrease with age

c. Most prevalent disease globally

d. Initiation is onset of puberty

10 / 60

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

a. A capsule.

b. Cell wall

c. Flagella

d. ATP synthesis

11 / 60

Which of the following statements on complication of Ludwig’s angina is INEXACTE?

a. Respiratory tract infections.

b. Death due to asphyxiation

c. pread of infection to masticator

d. Airway obstruction due to edema of glottis

12 / 60

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

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

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

c. Possibly systemic diseases

d. Commonly associated with poor and neglected oral hygiene

13 / 60

Virus replicate by which of the following?

a. Reproduction.

b. Within a host cell

c. Cell division

d. Extracellular

14 / 60

The primary cause of periodontal diseases is?

a. Restoration.

b. Dental Plaque

c. Malocclusion

d. Calculus

15 / 60

Which is not true about Ludwig angina?

a. May need emergency tracheostomy

b. Caused by an acute or chronic destructive process in periodontium

c. Involves submandibular space

d. Maintain fluid balance.

16 / 60

How to manage dental caries?

a. Institute surgical drainage.

b. Eliminate primary source of infection

c. Initial local debridement with ultrasonic scaling

d. Minimal cavity preparation techniques

17 / 60

Bacterial pathogens attach most often by all except which of the following mechanisms?

a. Spikes

b. Glycocalyx.

c. Fimbriae (pili)

d. Adhesins

18 / 60

Which of the following statements on dentoalveolar infections is INEXACTE?

a. Prevalence and severity increase with age

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

c. Clinical presentation depends on virulence of causative microorganisms.

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

19 / 60

True about caries, all EXCEPT:?

a. Not due to microorganisms

b. Microorganisms play the most essential role

c. Chronic endogenous infection

d. Demineralization of enamel.

20 / 60

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

a. Low levels of moisture

b. Constant source of nourishment

c. Relatively stable pH.

d. Stable temperature

21 / 60

Which of the following bacteria that is predominant in healthy condition?

a. Actinomyces israelii.

b. Streptococcus milleri

c. Streptococcus sanguinis

d. Actinomyces viscsus

22 / 60

Which of the following statements on chronic periodontitis is INEXACTE?

a. 95% of all periodontal diseases.

b. Morbidity 70–80%

c. Prevalence and severity decrease with age

d. Most prevalent disease globally

23 / 60

The most common protozoa in the oral cavity of people ?

a. Entamoeba histolytica

b. Giardia lamblia.

c. Giardia muris

d. Trichomonas tenax

24 / 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. Herpetic stomatitis

d. Pericoronitis

25 / 60

Various viral infections are of relevance to the dental team, including those that cause disease affecting the head neck region. Which one of the following viruses causes cold sores?

a. Herpes simplex

b. Epstein-Barr

c. Paramyxovirus

d. Herpes zoster

26 / 60

Coxsakievirus have been found to replicate in the?

a. Sensory nerve

b. Small bowel

c. Submucosal lymph tissue

d. Reticuloendothelial system

27 / 60

Actinobacillus actinomycetemcomitans possesses certain virulence factors that enable it to invade tissues, such as ?

a. Streptodornas

b. leukotoxin A

c. Hyaluronidase

d. hemolysine

28 / 60

Main causative organism of chicken pox is?

a. Varicella Zoster virus

b. Measles virus

c. Mumps virus

d. Fox virus

29 / 60

Porphyromonas gingivalis:?

a. Are aggressive periodontal pathogens

b. Are isolated from many extra oral sites

c. Are Gram-positive pleomorphic rods

d. Are non-capsulated

30 / 60

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

a. Escherichia coli

b. Staphylococcus epidermidis

c. Streptococcus sorbinus

d. Staphylococcus aureus

31 / 60

Primary herpesvirus infections may cause:?

a. Herpes zoster

b. Herpes labialis

c. Herpetic gingivostomatitis

d. Meningititis

32 / 60

Bacteria usually cause Pericoronitis?

a. Alpha-hemolytic Streptococci, Provetella, Bacterioides and Capnocytophaga

b. Borrelia vincentii, Bacterioides, Provetella and Eikenella corrodens

c. Fusiform bacillus , Provetella, Eikenella corrodens and Capnocytophaga sputigen

d. Fusiform bacillus, Eikenella corrodens, Alpha-hemolytic Streptococci and Capnocytophaga sputigena

33 / 60

A bacterium that never found in tooth surface:?

a. Streptococcus mutans

b. Streptococcus mitis

c. Streptococcus pneumoniae

d. Streptococcus anginosus

34 / 60

Strategy to control of rendox potential in oral biofilm:?

a. Stimulate base production

b. Oxygenating agents

c. Inhibition of key microbial enzyme

d. Fluoride

35 / 60

Major bacteria usually cause dental caries:?

a. Mutans Streptococci, Lactobacilli, Actinomyces vicosus

b. Mutans Streptococci, Lactobacilli, Clostridium

c. Mutans Streptococci, Staphylococcus aureus, Actinomyces vicosus

d. Streptococcus pneumoniae, Lactobacilli, Actinomyces vicosus

36 / 60

Infection in oral cavity by oral flora, which proposition is inexact?

a. Changes in the immune system

b. Changes in exposure to antiseptic

c. Changes in salivary flow

d. Administration of antibiotics

37 / 60

Microorganisms in oral tissue can cause 😕

a. Systemic infection

b. Local infection

c. Only local infection

d. Both, local and systemic infection

38 / 60

Antibiotic which is common use to treat anaerobic bacteria 😕

a. Vancomycin

b. Metronidazole

c. Colistin

d. Gentamicin

39 / 60

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

a. Artificial hip implant

b. Genital infection

c. Mouth

d. Subvenous catheter

40 / 60

Analytical techniques for monitoring biofilms by “Direct detection” 😕

a. High Pressure Liquid Chromatography (HPLC)

b. Gas Chromatography – Mass Spectrometry (GC-MS)

c. Inductively Coupled Plasma Mass Spectrometry (ICP-MS)

d. Microscopy techniques

41 / 60

Strategy to control of nutrients in oral biofilm:?

a. Inhibition of key microbial enzyme

b. Fluoride

c. Stimulate base production

d. Antimicrobial agents

42 / 60

Among 4 phases of biofilm formation, the phase that is done the longest, about 7-14 days is:?

a. Phase 3

b. Phase 2

c. Phase 1

d. Phase 4

43 / 60

ពពួកបាក់តេរីណាដែលអាចរស់នៅ បានដោយខ្យល់ O2 រី អត់សោះក៏បាន?

a. gonocoque

b. Eschérichia-coli

c. Salmonella

d. Entérobactérie

44 / 60

Bactérie ដែលមិនអាចបង្កើត Spore មាន?

a. coli bacille

b. pneumocoque

c. All are corrects

d. Staphylocoque

e. streptocoque

45 / 60

Micro-aérophile គឺជាពពួកបាក់តេរីដែលត្រូវការ?

a. មានខ្យល់ O2 ច្រើន

b. ខ្យល់ O2 តិចក៏បាន ច្រើើនក៏បាន

c. មិនត្រូវខ្យល់ O2

d. មានខ្យល់ O2 តិច

46 / 60

បាក់តេរី Aérobies strictes គឺពពួកបាក់តេរីដែលត្រូវរស់ និង លូតលាស់បានដោយ?

a. ត្រូវការតែខ្យល់ O2

b. ត្រូវការខ្យល់O2 និងមិនចាំបាច់ខ្យល់O2 ក៏បាន

c. ត្រូវឧស្ម័នការបូនិក + ខ្យល់ O2

d. មិនត្រូវការខ្យល់

47 / 60

virus មានចរិកលក្ខណៈ នៃភាវរស់នៅរបស់វាទាំងអស់ចំនួន?

a. ប្រាំមួយ

b. បី

c. ប្រាំ

d. បួន

48 / 60

បាក់តេរីប្រភេទ cryophile អាចរស់នៅក្នុងរង្វង់សីតុណ្ហភាព?

a. 4 ˚C

b. 10 ˚C

c. 8 ˚C

d. 6 ˚C

49 / 60

បាក់តេរីខ្លះមិនបង្កអោយមានជំងឺ ( non pathogéne ) អាចរស់នៅក្នុងmilieu?

a. milieu acide + base

b. milieu base

c. milieu acide

d. milieu base ក៏បាន acide ក៏បាន

50 / 60

Protoplaste គឺជាបាក់តេរីដែល?

a. គ្មានស្រោម + paroi, peptido-glycane et envelope extene ព័ទ្ធជុំវិញដោយ menbrame cytoplasmique តែមួយគត់ ។

b. មានស្រោម + paroi + enveloppe អត់មាន cytoplasme

c. គ្មាន ស្រោម + paroi peptido-glycane et envelope extemne cytoplasmique ជាច្រើន។

d. មានស្រោម + paroi peptide-glycane et enveloppe externe ព័ទ្ធជុំវិញដោយ menbrame cytoplasmique តែពីរគត់ ។

51 / 60

វិធីសាស្រ្តក្នុងការរំងាប់មេរោគក្នុងមន្ទីរពិសោធន៍មាន?

a. Flambage, acide chlorhydrique

b. Flambage

c. acide chlorhydrique

d. Acide sulfurique ( H2SO4)

52 / 60

បាក់តេរីណាខ្លះដែល sensible និងកាំរស្មី ultra violet , កាំរស្មី X និងពន្លឺ?

a. ពពួក Entérobactérie

b. ពពួកបាក់តេរី gram (+)

c. ពពួកបាក់តេរី gram(-)

d. ពពួកបាក់តេរី gram (+), gram(-) and ពពួក Entérobactérie

53 / 60

ការជ្រាបចូលនៃសារធាតុនិង ចំណីអាហាររបស់បាក់តេរី កាលណាវាជា forme simple អាចជ្រាប ចូលដោយត្រង់ៗដូចជាសារធាតុ?

a. Acetyl-CoA

b. Acide amine , ជាតិស្ករ

c. glucose, ATP ,Acide amine

d. ATP , glucose

54 / 60

មធ្យោបាយសិក្សា bacteria , virus and fungi 😕

a. Transmission Electron Microscope

b. All are corrects

c. Electron Microscope

d. Optical microscope

55 / 60

ពួកបាក់តេរី pseudomonas អាចរស់នៅក្នុង milieu ?

a. milieu acide + base

b. milieu acide

c. milieu base

d. All are corrects

56 / 60

ដើម្បីរស់ បាក់តេរីការចំណីអាហារប៉ុន្មានភាគរយ នៃ Ration totale សំរាប់ការរស់នៅក្នុងធម្មជាតិ?

a. 1/400

b. 1/600

c. 1/300

d. 1/500

57 / 60

បាក់តេរីដែលជាសត្រូវរបស់មនុស្សគឺ?

a. psychophile

b. Thermophile

c. cryophile

d. Mésophile

58 / 60

បាក់តេរីប្រភេទ themophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យមលើសពី?

a. 37 ˚C

b. 40 ˚C

c. 30 ˚C

d. 20 ˚C

59 / 60

សេចក្តីត្រូវការផ្នែកថាមពល ( besoins énergétique )សំរាប់ធ្វើសំយោគម៉ូលេគុលដែលជា សារធាតុសំខាន់ក្នុងការបង្កើតថាមពលរបស់បាក់តេរី?

a. carbone , Phosphore , Calcium

b. carbone , Phosphore , Calcium, ជាតិស្ករ

c. ជាតិស្ករ ,ATP , A cétyl co-A , Glucose-6 Phosphate

d. ATP , ជាតិស្ករ , Calcium , O2

60 / 60

បាក់តេរីប្រភេទ psychrophile អាចរស់នៅក្នុងសីតុណ្ហភាពជាមធ្យម?

a. ក្រោម 20 ˚C

b. ក្រោម 40 ˚C

c. លើសពី 30 ˚C

d. លើសពី 20 ˚C

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និស្សិតអាចប្រាប់មកកាន់ពួកយើងបានដើម្បីកែកំហុស ឬអំពីបញ្ហាដោយអចេតនាណាមួយដែលកើតមានកំឡុងពេលធ្វើតេស្ត