Bioactive Ceramics for Endodontics

oxygen

bioceramics are:

- Primarily containing compounds of ..... with one or more metallic or semi-metallic elements

low

bioceramics have .... electrical conductivity

opposing

bioceramics wear ... enamel

apatite

bioactive bioceramics are .... forming

calcium phosphate

hydroxyapatite is a .... compound

PO4 3-

released Ca2+ and OH- ions react with with .... to form hydroxyapatite

lesion

lack of bone + periodontal ligament

open apex

lack of dentin and cementum

CSC

what is the most common bioactive bioceramic

tricalcium

the main component of CSC is .... silicate crystals

iron

more .... content in a CSC makes it darker

tricalcium silicate

what component of CSC contributes to early strength

dicalcium silicate

what component of CSC contributes to late strength

tricalcium aluminate

what component of CSC contributes to added strength and accelerates setting time

calcium; silicon; aluminum

the three oxides in MTA are .....

theracal

what material:

Pros:

• Light-cured

• Convenient delivery

Cons:

• Less tricalcium silicate and less calcium release than MTA/others

• Contains resins, which can be cytotoxic if not completely cured

• Lower success as a pulp cap material, compared to other bioceramics

endodontic

thin bioactive bioceramics are commonly used as .... sealers

dentin

thick bioactive bioceramics are commonly used as .... substitutes

thick

..... bioactive ceramics are typically >50% cement

poor

MTA is known to have ... handling

gel

mixing MTA with ... is easier than mixing with water

hydration

bioactive bioceramic set as a .... rather than an acid base reaction

15

the initial set time of bioactive bioceramics is ... minutes

3-4

the final set time of bioactive bioceramics is ... hours

inward

a putty from a tube sets due to an ... diffusion of water

high

radiopacity of bioactive bioceramics is achieved with elements of .... atomic numbers

3

for a material to be radiopaque it needs to be >....mm AI

bismuth oxide

the interaction of ..... with collagen present in tooth tissue and sodium hypochlorite is the main causative factor of staining

no

are tricalcium and dicalcium silicates acid resistant

crown cements

bioactive bioceramics are are contraindicated for:

- restoration

- cervical resorption

- ......

lower

•Bioactive sealers may exhibit ... cytotoxic potential compared to other types of root canal sealer

should

an ideal irrigant .... dissolve organic and inorganic tissue

no

should your final irrigant be a chelator

adhesion; shrinkage

the main disadvantages of gutta percha include it lack of ... to dentin and ....

no

does aluminum cause alzheimers disease