Zusammenfassung der Ressource
Pulp - Linings
- Chemical attack, Thermal discomfort, Galvanic effects
- CHEMICAL ATTACK
- Constituents of certain restorative materials
- Acrylic Resin
- Acids in certain dentine bonding agents
- Residual acid from acidogenic bacteria left behind
- THERMAL SHOCK
- Polymerisation exothermof some rest materials
- Such as resin comp or VLC glass Polyalkenoate
- Light curing unit
- Hot/cold food and drinks
- Cavity prep produces heat (use water as coolant)
- GALVANIC EFFECTS
- rest of dissimilar materials in close proximity
- with inadequate insulation
- Sets up an electrolyte cell (electrolytes-saliva)
- Glavanic pain - kit lat and amalgam/gold opposing amalgam
- CAVITY PREP
- Insults the pulp - results in increased inflam cell infiltrate
- Prep results in 'smear layer' being left
- occludes the dentinal tubules with: bacteria,collagen,hydroxapatite
- IDEAL PULP PROTECTION
- non toxic/irritant, bacteriostatic
- Gives good coronal seal
- Thermal/electrical insulator
- Strength to withstand rest placement
- Radiopaque
- compatible with rest materials
- Obtudant (soothing) to the pulp
- LINING MATERIALS
- Calcium Hydroxide
- Zinc oxide eugenol
- zinc polycarboxylate
- zinc phosphate
- glass polyalkenoates
- CALCIUM HYDROXIDE
- high pH - initially irritates the pulp: reactionary dentine laid down
- High pH - bacteriocidal
- Thermal/electrical insulator
- radiopaque and compatible with materials
- Insufficient strength to condensing
- not adhesive - no coronal seal
- ZINC POLYCARBOXYLATE
- Poly F
- High molecular weight reduces penetration to tubules
- only mildly irritant to the pulp
- Contains fluoride - bacteriostatic
- Good strength for material placement
- good insulator
- Contains zinc - radiopaque
- ZINC OXIDE AND EUGENOL - KALZINOL
- Slightly irritant to pulp
- Bacteriocidal
- Thermal/electrical insualtor
- eugenol - obtudant
- not adhesive - no coronal seal
- Not compatible with resin comp
- ZINC PHOSPHATE
- Low pH - highly irritant to pulp
- Thermal/electrical insulator
- radiopaque, bacteriocidal
- Not obtudant
- GLASS POLYALKENOATES
- Vitrebond - mildly irritant to pulp
- contains fluoride
- good strength and coronal seal
- compatible with resin