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Flashcards in compomers ceromers ormocers 8 Deck (19):
1

COMPOMERS Terminology

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

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COMPOMERS
Delivery mode

Monocomponent system (hermeticallysealed package,metallicfoils)

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COMPOMERS
Composition

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

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COMPOMERS
Setting reaction

-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)

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Differences between Differences between COMP COMP and and RMGIC

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

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comp properties mechanical

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

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comp surface properties

-much better than RMGICsand maintained intime

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comp adhesive properties

similar adhesion as the RBCs–similar use of adhesive systems

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comp carrioprophylactic effect

-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

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comp polymerization shrinkage

-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

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comp water sorbtion

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

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comp handling features

non-sticky→ →→ →preferred comparing with RMGICs7

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comp indications

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

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subclasses of RBCs

•CEROMERS •ORMOCERS •POLYGLASSES

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the ceromers
terms
composition
indications

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
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INDICATIONS:
-class I, II, III, IV, Vcavities, cervical erosions
-polymeric or ceramic veneers repairs
-direct inlays/ onlay
!They need special (adapted) adhesive systems
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the ormocers
terms
composition

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

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the ormocers
setting
properties
indications

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%

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polyglasses

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

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Selection criteria of the aesthetic direct restorative materials

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