MCQs
1. "Double inverted cone" type of penetration of dental caries
is seen in:
A. Smooth surface caries
B. Pit and fissure caries
C. Both of the above
D. None of the above
2. Pit and fissure lesions are represented by:
A. Apex of cone facing each other
B, Base of cone facing each other
C. Double inverted cone
D. None of the above
3. Proximal carious lesion occurs mostly:
A. Just occlusal to contact area
B. Just cervical to contact area
C. Irrespective of contact area
D. None of the above
4. Development of smooth surface dental caries is due to all of
the following, except:
A. Low salivary flow
B. Frequent sucrose consumption
C. Radiation therapy
D. Anl0unt of sucrose consumption
5. Smooth surface caries is mainly caused by:
A. Lactobacilli
B. Streptococcus mutans
C. Actinomyces
D. All of the above
6. Patients with which of the following salivary levels of
Streptococcus mutans are considered as high-risk for dental
caries?
A. Above 104 CFU / ml
B. Above 106 CFU / ml
C. Above 108CFU/ml
D. Below 104CFU/ml
7. A patient with less than 104 CFU of lactobacilli per ml of
saliva is associated with:
A. High caries risk group
B. Medium caries risk group
C. Low caries risk group
D. None of the above
8. According to Klock and Krasse, the high caries risk group
comprised of:
A. 25% of population
B. 23% of population
C. 28% of population
D. 32% of population
9. The first anti-gingivitis oral rinse approved by FDA and ADA
Council is:
A. 2% chlorhexidine gluconate
B. 0.2% chlorhexidine gluconate
C. 0.12% chlorhexidine gluconate
D. 1% chlorhexidine gluconate
10. The method of choice for removal of interproximal plaque
is:
A. Unitufted waxed floss
B. Multitufted unwaxed floss
C. Multitufted waxed floss
D. Unitufted unwaxed floss
11. Sealants are not recommended routinely on:
A. Primary molars
B. Over another restorative material
C. Interproximal lesions
D. All of the above
12. Percentage of pit and fissure caries in children is:
A. 60 to 70%
B. 50 to 60%
C. 80 to 90%
D. 40 to 60%
13. Incidence of dental caries in young children is most
effectively reduced by:
A. Sealants
B. Oral prophylaxis
C. Flossing
D. None of the above
14. Remineralization of the cariously damaged tooth structure
occurs as local pH:
A. Rises above 7
B. Rises above 5.5
C. Decreases below 5
D. None of the above
15. The term 'odontopathic' refers to:
A. Causing disease to odontoblasts
B. Causing disease to teeth
C. Causing disease to enamel only
D. None of the above
16. Streptococcus mutans and lactobacilli are the primary
cariogenic organisms and are said to be:
A. Acidogenic only
B. Aciduric only
C. Both acidogenic and cariogenic
D. None of the above
17. The term "aciduric" refers to:
A. Bacteria producing great amount of acids
B. Bacteria capable of tolerating acidic environment
C. Bacteria unable to tolerate acidic environment
D. None of the above
18. The microorganisms most strongly associated with " onset
of caries" and active progression of cavitated lesions are:
A. Staphylococcus aureus and Streptococcus mutans
B. Staphylococcus aureus and lactobacilli
C. Streptococcus mutans and lactobacilli
D. Viridans and Actinobacillus group
19. Nonspecific plaque hypothesis assumes that:
A. All plaque are pathogenic
B. Plaque is pa tho genic only when signs of disease are present
C. Both A and B
D. None of the above
20. The single most important factor in producing cariogenic
plaque is:
A. High amount of glucose exposure
B. High frequency of glucose exposure
C. High amount of sucrose exposure
D, High frequency of sucrose exposure
21. The teeth normally have a plaque community dominated by:
A. Streptococcus sanguis and Streptococcus mutans
B. Streptococcus sanguis and Streptococcus mitis
C. Lactobacilli and Streptococcus mutans
D Streptococcus salivarius and lactobacilli
22. The process of plaque regrowth after the tooth surface is
cleaned is termed as:
A Primary succession of plaque growth
B. Secondary succession of plaque growth
C. Tertiary succession of plaque growth
D None of the above
23. Going from higher to lower demineralization of enamel starts
at the pH range from:
A . 3 to 4
B. 5 to 5.5
c . 6 to 7
D. None of the above
24. The second most susceptible area of tooth to caries are:
A Buccal and lingual pits of molars
B. Pit and fissures
C. Proximal surface gingival to contact area
D. Facial and lingual smooth surface
25. Root caries is initiated by:
A. Streptococcus mutans
B. Lactobacilli
C. A.viscosus
0, Anaerobes
26. The time for progression from incipient caries to clinical
caries, i.e. cavitation on smooth surfaces is estimated to be:
A 15 months ± 6 months
B. 15 months ± 8 months
C. 18 months ± 6 months
O. 18 months ± 3 months
27. What is the difference between white spot of
hypocalcification and white spot of incipient caries?
A. No difference, both are same
B. Hypocalcified spot disappears on wetting and reappears
on drying while incipient caries spot is not changed
C. Incipient caries spot partially or totally disappears visually
when hydrated while hypocalcified spot is unaffected on
hydration
D. None of the above
28. Arrested carious lesion is:
A. Discolored and remineralized area
B. Intact and more resistant to caries attack than adjacent
unaffected enamel
C. Not restored unless esthetically required
D. All of the above
29. The deepest and advancing front of enamel carious lesion
is:
A. The dark zone
B. The body of the lesion
C. The translucent zone
D. The surface zone
30. The zone of enamel caries, which is relatively
unaffected by caries attack is:
A. The dark zone
B. The surface zone
C. The translucent zone
D. The body of the lesion
31. Which part of tooth is least resistant to caries?
A. Surface enamel
B. Dentin
C. Dentinoenamel junction
D. Cementum
32. A reliable test to detect caries is:
A. Only visual
B. Only by use of explorer
C. Only radiograph
D. None of the above
33. Must effective treatment in preventing pit and fissure caries
is:
A. Local fluoride application
B. Systemic water fluoridation
C. Pit and fissure sealants
D. Enameloplasty
34. Occlusal surfaces account for only of all tooth surfaces:
A. 10.5%
B. 12.5%
C. 14.5°/.,
D. 16.5%
35. The levels of which bacteria can be used to assess the effectiveness of caries control procedures?
A. Streptococcus mutans
B. Staphylococcus aureus
C. Lactobacilli
D. A.viscosus
36. Caries control refers to:
A. removal of infected tooth structure
B. Medicating the teeth
C. Restoring defects with temporary material
D. All of the above
37. Senile caries is:
A. Recurrent caries
B. Residual caries
C. Root surface caries
D. Forward caries
38. Dental caries is said to be 'extensive' when:
A. It involves more than one tooth
B. Distance between infected dentin and pulp is less than
2mm
C. Distance between infected dentin and pulp is less than
lmm
D. All of the above
39. A bacteria not associated with caries process is:
A. Streptococcus mutans
B. Lactobacillus acidophillus
C. Staphylococcus aureliS
D. Actinomyces
40. When ages are equal, studies have shown that young girls
have slightly higher caries index than boys. This is attributed
to:
A. Girls eat more sweets
B. Hormonal differences
C. Earlier growth spurt in girls
D. Earlier eruption of dentition in girls
41. Clinically the earliest evidence of caries is:
A. Sensitivity to sweets
B. Roughness on the surface of tooth
C. Brown area on tooth surface
D. Chalky white area on the tooth
42. Fluoride-richness of surface enamel:
A. Remains constant
B. Increases with age
c. Increases in increments
D. Decreases with time due to occlusal wear
43. A person suffering from xerostomia is more likely to have:
A. Cemental caries
B. Decrease in dental caries
C. Increase in lesions of dental caries
D. Arrested caries
44. Pit and fissure sealants are generally not used in:
A. Molars
B. Teeth showing signs of opacity in pit or fissure
C. Patients receiving fluoride therapy
D. Cavitated lesion
45. The most reliable index for dentinal caries removal is:
A. Color difference
B. Depth of cavity
C. Tactile stimuli
D. Pain perception
46. Caries control is an intermediate step in restorative treatment
and most frequently used materials are:
A. Composite resin
B. Amalgam
C. Amalgam and intermediate restorative material
D. None of the above
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