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CSA > Calculus- clinical perspective e lec > Flashcards

Calculus- clinical perspective e lec Flashcards

to review development and clinical significance of calculus distinguish between supra and sub calc in terms of location distribution formation anf composition appearance morphology describe diagnosis clinical significance

1
Q

what is the definition of calculus

A

mineralised plaque ,calcified/calcifying deposits attached to the surface of teeth or other solid structures in the cavity

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2
Q

what is the location of supraginigval calculus

A

located coronal to the gingival margin

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3
Q

what is the distribution of supragingival calc

A

distributed near the opening of salivary ducts such as the UL/UR6, lower anteriors

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4
Q

what is the location of subgingival calculus

A

located apical to the gingival margin

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5
Q

what is the distribution of subginigval calculus

A

can be located anywhere in the mouth

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6
Q

how does calculus form

A

plaque formation precedes calculus formation and provides an organic matrix

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7
Q

what minerals are derived from saliva for supragingival calc

A

calcium and phosphate

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8
Q

where are minerals derived from for supraginigval calc

A

saliva

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9
Q

where are minerals derived from for subginigval calc

A

GCF(gingival crevicular fluid)

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10
Q

which crystals are found in supragingival calc

A

hydroxyapatite, octacalcium phosphate, brushite(new supra)

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11
Q

what crystals are found in subgingival calc

A

magnesium whitlockite

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12
Q

what shape are crystals in supragingival calc

A

small needle shaped, large ribbon shaped

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13
Q

what size are subg crystals

A

small crystals

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14
Q

calcification mechanisms

A

epitactic and booster

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15
Q

how does calculus form

A

it forms due to small crystals appear in the inter microbial matrix and the matrix between microorganisms becomes calcified and mineralised.

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16
Q

what is the mineral content of saliva by volume

A

37%

17
Q

where is fluoride distribution more regular

A

in subgingival calc

18
Q

what is the mineral content of GCF by volume

A

58%

19
Q

what is the growth like of subgingival calc

A

more homogenous calcification, slow growth, less filamentous

20
Q

what is the growth of of supraginigval calc

A

more filamentous, faster

21
Q

what is the appearance of supra calc like

A

creamy white, yellow may be stained in smokers

22
Q

which minerals are less proportion in supragingival calc than in subginigval calc

A

Ca,Mg,F,Sr,Zn

23
Q

which minerals are greater proportion in supraginigval calc than subginigval

A

carbonate and Mn

24
Q

what is the appearance of subginigval calc

A

darker,brownish could be black

25
Q

what is the morphology of supra calc like

A

it is usually amorphous ( doesnt have a distinguised shape)

26
Q

what is the morphology of sub calc

A 
crushy,spiny,nodular
ledge or ring formation 
thin,smooth veneers 
finger and fern like 
islands or spots 
supra can also be ontop of sub sometimes
27
Q

why can RSD be difficult sometimes

A

due to the spiny, nodular and crusty deposits which might be difficult to clean effectively

28
Q

what is the diagnosis of supragingival calc

A

location
colour
rough feeling
dry with 3-in-1 and will be chalky

29
Q

diagnosis of subgingival calc

A

location
deposit colour
WHO 621 probe
visible following recession or attachment loss
papilla dark red colour- check with WHO probe
grey shadow under ginigva- check with WHO probe
radiography

30
Q

what is the probing force we should use

A

20-25g

31
Q

what is the size of the ball end on the WHO 621

A

0.5mm

32
Q

what instruments are used for RSD

A

SGC 11/12
SGC 13/14
vision curette

CSA (51 decks)

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