Dental plaque & Calculus #WikiDentia

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Predominant bacteria found in two days old plaque

1 point

a) Streptococci

b) Bacteroides

c) Spirocheates

d) Actinomyces

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In deep older plaque

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a) Streptococci and actinomyces are replaced by rod like organism

b) Streptococci are completely replaced by neisseria

c) Streptococci actinomyces and veilonella remain prominent

d) Actinomyces are completely replaced by streptococci

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Supra gingival plaque causes

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a) Gingivitis

b) Periodontitis

c) Pericoronitis

d) Aphtous ulcers

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Dental plaque adheres to the tooth because

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a) Levans are gummy

b) Dextrans are insoluble and sticky

c) Plaque grows into the irregularities

d) Microorganisms produce sticky lipoproteins

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"Corn-Cob" appearance seen in

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a) Supragingival calculus

b) Subgingival calculus

c) Supragingival plaque

d) Subgingival plaque

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Central gram negative core supporting outer coccal cells is called:

1 point

a) Bristle brush arrangement

b) Corncob arrangement

c) Bottle brush arrangement

d) Hourglass arrangement

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Breakdown of periodontal fibres in periodontitis is due to bacterial enzyme: (OR) Which of the following bacterial products have been implicated in initiation of inflammatory periodontal disease?

1 point

a) Collagenase

b) Hyaluronidase

c) Coagulase

d) None of the above

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Pellicle formation involves

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a) Adsorption of acidic glycoprot eins from saliva

b) Focal areas of mineralisation

c) Focal areas of necrosis

d) Bacterial colonization

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Co-aggregation is mainly predominated by

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a) interaction between Gm + bacteria

b) interaction between Gm - bacteria

c) interaction between Gm + and Gm - bacteria

d) none of the above

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Which surface of tooth has most of plaque?

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a) Gingival third of tooth surface

b) Incisal one third of tooth surface

c) Middle third of tooth surface

d) Uniform on all surfaces

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Which of the following plaque is most harmful and causes spread of Inflammation to the connective tissue leading to bone destruction:

1 point

a) Subgingival epithelial attached

b) Subgingival unattached

c) Subgingival plaque

d) Supragingival plaque

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Bacteria in plaque form

1 point

a) Intracellular polysaccharides

b) Extra cellular polysaccharides

c) Both A and B

d) Complex polysaccharides

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