Bioactive Ceramics

biomaterial

material used in human body

dental ceramics

non-metallic

inorganic

oxygen + 1+ metallic/semi-metallic element

how do bioactive ceramics work

calcium and hydroxide ions release and react with phosphorus ions and produce hydroxyapatite

bioceramic sealer

MTA sealer

BC sealer

8 uses for bioactive materials

indirect pulp cap

direct pulp cap

pulpotomy

apexogenesis/apexification/regendo

perforation repair

resorption repair

sealing/obturation

root-end filling (open apex/SRCT)

MTA composition

calcium

silicon

aluminum

theracal is

lightcured

endodontic sealers are

thin

large range of cement content

dentin substitutes are

thick

mostly >50% cement

MTA is not an

acid base reaction

MTA is a

hydration

MTA initial set time is

15 min

MTA final set time is

3-4 hours

levels need to be __ to achieve radiopacity

>3mm Al

what causes discoloration that is associated with MTA

bismuth oxide’s interaction with collagen and sodium hypochlorite

_____ have lower bond strength to composite than composite to dentin

CSC’s

contraindications of bioceramics

restorations

cervical resorption

crown cements

tricalcium + dicalicium silicates

not acid resistant

should an ideal sealer be tacky

yes

should an ideal sealer be hermetic

yes

should an ideal sealer be radiolucent

no

should an ideal sealer shrink

no

should an ideal sealer set fast

yes

should an ideal sealer be insoluble in tissue fluids

yes

should an ideal sealer be soluble in common solvent

yes

what kind of sealers exhibit lower cytotoxic potential

bioactive sealers

final irrigant should not be a

chelator

zincoxide is

inert

what are common solvents that can remove calcium from dentin

citric acid, EDTA, carbonic acid