Dental Material Pros/Cons/Indications/Contras Flashcards
RMGIC - constituents? resin?
GIC + water-soluble resin and modified poly(acryclic acid)
HEMA
RMGIC - key advantages?
Seals dentinal tubules and decreases risk of microleakage
Sustained release of F (increases degrade)
Ca and collagen bonding
Long working time
Limited moisture sensitivity
Releases bacteriostatic benzoyl iodides/bromides
RMGIC - key disadvantages?
Prone to staining with time Shrinkage Swelling (moisture uptake) Exothermic on curing Monomer leach Benzoyl iodides/bromides cytotoxic
RMGIC - indications?
Small-sized C I
C III and V
Non-carious tooth surface loss
Only few shades available
Core build-ups (>50% tooth remaining)
Open and Closed sandwiches
Dressing (alternative to GIC for command set)
Luting***
Restore deciduous (minimally invasive and F)
Linings (seal tubules, bacteriostatic, F and radiodense)
Bonding dental amalgam
Blocking undercuts for indirect restorations (bond tissue and easy handling)
RMGIC - presentations?
Powder/liquid
Encapsulated (less voids)
Paste/paste system (increase wear resist)
RMGIC - summary?
Limited advantages over GIC HEMA cytotoxic Improved F release Mech props > GIC Particularly for luting restorations
RMGIC - contraindications?
For direct placement on both pulpal and periradicular vital tissue
Amalgam - constituents?
Alloy + mercury
Alloy containing silver, tin and copper + mercury
Amalgam - key advantages?
Compressive strength
Early strength
Spherical alloy stronger
Amalgam - key disadvantages?
Tensile strength
Creep y1
Corrosion y1
High thermal diffusivity
Amalgam - indications?
Class I and II cavities
(Class III and V)
Cores for cast restorations
Amalgam - cavity design?
Depth - 2mm Rounded line angles Cavo-surface angles 90-110 No unsupported enamel Retention form (undercuts and slots)
Amalgam - benefits of bonding? bonding material?
Increased retention and fracture resistance
Decreased microleakage, trauma, inflammation, PostOP sensitivity, recurrent caries, cuspal deflection
Resin based composite adhesive
Little in vivo evidence
Amalgam - presentation?
Encapsulated - easier mix, dispense
Amalgam - adverse effects?
Enamel discolouration (dentine permeability) Amalgam tattoo (migrate to soft tissue) Lichenoid (hypersensitivity) Galvanic cell (2 different metals and saliva)
Amalgam - contraindications?
Pregnant women
Allergy
Aesthetics
Objection
Amalgam - summary?
Higher copper, spherical or admixed alloy performs better
GIC - name? constituents?
Glass Polyalkenoate cement
Glass and polyacrylic acid
GIC - mechanical properties?
Compressive strength = dentine
Strength increases with time
GIC - bonding?
Chemical bonding: H bond with collagen and form a Ca polyacrylate salt replacing the hydroxyapatite structure
Bonds can reform
GIC - indication?
Intervisit endodontic material Restore deciduous Atraumatic restorative technique Tunnel preps C III CV (especially nn-carious tooth loss) Long-term temporisation/intermediate restoration Core build-ups PRR Base/Liner Dressing (non-retentive cavity or composite as final material) Fissure sealants Luting (crown and bridge retainers)
GIC - key advantages?
F release (can be replenished) Less staning than composite (but less shade variation) Composite > GIC for aesthetics
GIC - contraindications?
High load C I or C II
Large posterior cavities
Core build ups with little tooth
Aesthetics
GIC - presentation?
Encapsulated
Powder/liquid
GIC - summary?
Composite > GIC mechanically but F release
Need protection from moisture contamination and desiccation
ZPC - constituents?
Zinc oxide + poly(acrylic acid)
ZPC - mechanical properties?
Lower modulus of elasticity and less likely to fracture under heavy load