plaque and calculus

Question 1

what is plaque made up of?

Answer 1

microorganisms and interbacterial matrix

Question 2

what is the intermicrobial matrix?

Answer 2

made up of dead microorganisms, metabolic by products, enzymes and toxins
feeds to bacteria in plaque

Question 3

what are features of plaque that differ to calculus?

Answer 3

un mineralised
made of living microorganisms
destructive
easy to remove
forms all over dentition

Question 4

what are features of calculus that differ to plaque?

Answer 4

hard
mineralised
no living organisms
not directly destructive
forms around salivary ducts

Question 5

what is the compostition of calculus

Answer 5

80% inorganic salts- calcium and phosphate
organic- proteins and carbohydrtaes
lipids

Question 6

what are the main crystalline forms of calculus?

Answer 6

hydroxyapatite
magnesium witlcokite
octacalcium phosphate
brushite

Question 7

what form is most common in supra/ new calcululs?

Answer 7

brushite

Question 8

what from is common in older calculus?

Answer 8

hydroxiapatite

Question 9

what is common in sub gingival calculus?

Answer 9

magnesium withlockite

Question 10

what are the effects of calculus on the peridontontium?

Answer 10

rough surface, attracts plaque
hampers adequate hygiene
porous, hold toxins
plaque more pathogenic than calculus