compomers ceromers ormocers 8

Question 1

COMPOMERS Terminology

Answer 1

Polyacidmodified resin composites (COMP) Composites+ ionomers= compomers Dyract (Dentsply De Trey) -1993

Question 2

COMPOMERS

Delivery mode

Answer 2

Monocomponent system (hermeticallysealed package,metallicfoils)

Question 3

COMPOMERS

Composition

Answer 3

1.a.dimethacrylicorganicalmatrix+ b.acidgroups(carboxylicgroups) 2.filler(fluoridealumino-silicateglass) 1b+2=acid-basesettingreaction

Question 4

COMPOMERS

Setting reaction

Answer 4

• main setting reaction–light-curing
• the acid component of the organical matrix can’t participate at the acid-base reaction, because there is no water between the components
• in the oral environmentwhile it uptakes water–>acid-base reaction(between the carboxylic and polyglasschains)

Question 5

Differences between Differences between COMP COMP and and RMGIC

Answer 5

RMGIC–acid-base reaction starts immediately + lightlight–curing
COMP––lightlight–curing+ delayed acid–base reaction

Question 6

comp properties mechanical

Answer 6

these materials were introduced in order to combine the mechanical and surface properties of the RBCs with the adhesive and F release of the GIC
1.Mechanicalproperties -mechanical strength >GIC andRMGIC ~RBC with microfiller -hardness≤ ≤≤ ≤RBCs -abrasion strength decreases in time due to acid attack against glass particles and due to acid-base setting reaction

Question 7

comp surface properties

Answer 7

-much better than RMGICsand maintained intime

Question 8

comp adhesive properties

Answer 8

similar adhesion as the RBCs–similar use of adhesive systems

Question 9

comp carrioprophylactic effect

Answer 9

• in the oral environment–acid attack against the glass particles of F-Al-silicate=>it is released a certain amount of F-ions
• the time of F-ions release is reduced and there is no evidence that these materials reduce secondary decays

Question 10

comp polymerization shrinkage

Answer 10

-similar to that ofRBCs, but =>the main part of the shrinkage is produced in the plastic phase and it can be compensated through creep -positive effect on the reduce of residual stress and on the marginal closure

Question 11

comp water sorbtion

Answer 11

made
through the hydrophilic organical matrix, generally>than RBCs -it increases the F-ions release -used in big quantity–negative effect on the mechanical properties

Question 12

comp handling features

Answer 12

non-sticky→ →→ →preferred comparing with RMGICs7

Question 13

comp indications

Answer 13

• decidualteeth fillings
• special fillings for decidualteeth
• class V cavities and cervical erosions
• class I and II cavities
• class III cavities
• sealant agents
• bracketsfixing

Question 14

subclasses of RBCs

Answer 14

•CEROMERS •ORMOCERS •POLYGLASSES

Question 15

the ceromers
terms
composition
indications

Answer 15

Terms:
Resin composites which have inside inorganic filler, ceramic particles
Ceramic optimized polymer= ceromer i.e.Targis (Ivoclar), Tetric Ceram (Vivadent)
Composition: 1.dimethacrylicorganic matrix 2.80% of filler -5 types of particles -Baglass/ yttrebium trifluoride/ glass of AlFsilicate/ sillica/ oxides mixture
10
INDICATIONS:
-class I, II, III, IV, Vcavities, cervical erosions
-polymeric or ceramic veneers repairs
-direct inlays/ onlay
!They need special (adapted) adhesive systems
11

Question 16

the ormocers
terms
composition

Answer 16

Term :
RBC with organic phase –>an inorganic -organic monomer
Organically modified ceramics= ormocer
i.e.Definite (Degussa) Admira (VOCO) -1999
Composition:
..organic phase : polysiloxane matrix with double curing bonds
2. inorganic filler

Question 17

the ormocers
setting
properties
indications

Answer 17

Setting reaction
The Si(OR)3group can form double bonds with the matrix’s monomers or with inorganic components of the filler=>polycondensed matrix(rich crosslinked)

Properties
•The molecular weight is1000x >than that of the RBCs’ monomers •Polymerization shrinkage with 50%

Question 18

polyglasses

Answer 18

Terms:
Resin composites which after their polymerization have glass features;they are frequently used for indirect
restorations (made in the dental lab)
i.e. Artglass (Heraeus Kulzer) –1995; Belle-glass (Kerr) – 1996; Solitaire (Heraeus Kulzer) –1997

Composition: 1.organic matrix based on polyfunctional monomers - increased conversion rate of polymerization and chromatic stability 2. inorganic filler (65%) –mixture of glasses16

Question 19

Selection criteria of the aesthetic direct restorative materials

Answer 19

advantages versusdisadvantages lateral zoneversus anterior zone
•Criteria: –longevity–mechanical and chemical properties –minimal loss of dental tissue–adhesion type/ preparation type –aesthetics–initially and in time 21