Dental calculus #WikiDentia

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Mineralization inhibitors of calculus formation include all of the following except

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a) Pyrophosphate

b) Zinc salts

c) Diphosphates

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Calculus attaches to tooth structure by the following ways except:

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a) By means of an organic pellicle

b) Mechanical locking in surface irregularities

c) Close adaptation to undersurface depressions

d) Tags of calcium phosphate reacting chemically with enamel walls

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In periodontal disease, calculus is considered as

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a) Contributing factor

b) Primary factor

c) Etiological factor

d) Governing factor

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CALCULUS all are true except:

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a) Supragingival calculus is brown in colour

b) Hard and gritty

c) Calcified from plaque

d) Subgingival calculus is more difficult to remove than supragingival calculus

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Predominant component of supragingival inorganic calculus is:

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a) Magnesium phosphate

b) Calcium carbonate

c) Calcium phosphate

d) Carbon dioxide

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Subgingival calculus

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a) cannot occur without supragingival calculus

b) contains less hydroxyapatite than supragingival calculus

c) is uncommon in children

d) derives its minerals from same source as supragingival calcu lus

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Calculocementum

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a) Non-calcified structures

b) Calculus embedded deeply in cementum

c) Non-attachment mechanisms

d) Non similar to cementum

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Which of the following crystals is more commonly found in the calculus of mandibular anterior areas?

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A. Hydroxyapatite

B. Magnesium whitlockite

C. Octacalcium phosphate

D. Brushite

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The difference in the colour between sub and supragingival calculus is related to?

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a) pH of plaque

b) Death of leucocytes

c) Hemolysis of erythrocytes

d) All of the above

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The most efficient means of identifying supragingival calculus is by:

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A. Visual observation and compressed air

B. Tactile detection and periodontal probe

C. Use of disclosing solution

D. Transillumination

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Dental calculus contains:

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A. Vital microorganisms

B. Non-vital microorganisms

C. Both of the above

D. None of the above

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