Dental Luting Agents Flashcards
what is a dental luting agent?
A material used to BOND dental restorations (like crowns, bridges, inlays, onlays and veneers to teeth).
Luting agent is a better term than dental cement
What are types of dental luting agents?
- Dental Cements
- Composite Resins
- Self adhesive Composite Resins
- surface modifying chemicals
what properties does a luting agent have to include?
- viscosity & film thickness
- ease of use
- radiopaque
- marginal seal
- aesthetics
- solubility
- cariostatic
- biocompatible
- mechanical properties
what makes a luting agent easy to use?
- Easy to mix (many products encapsulated, clicker system)
- working time should be long to allow for seating of restoration
- setting time should be short
why should luting agents be radiopaque?
- some ceramic crowns are radiolucent
- makes it easier to see marginal breakdown
why is a luting agent important for marginal seals?
- ideally should bond chemically to the tooth with a PERMANENT and IMPENETRABLE BOND
what aesthetics does a luting agent need?
- tooth coloured (variation in shade and translucency)
- non staining
what should the solubility of a dental luting agent be and why?
LOW
dont want it to dilute with anything else like saliva in mouth during application
what cariostatic properties do luting agents need?
- fluoride releasing
- antibacterial
[IMPORTANT IN PREVENTING SECONDARY CARIES AROUND CROWN MARGINS]
what are the biocompatibility requirements for a dental luting agent?
- not toxic
- not damaging to the pulp (inappropriate pH and heat on setting)
- low thermal conductivity
what are good mechanical properties for a dental luting agent?
High:
- compressive strength
- tensile strength
- hardness value
Young’s elastic modulus similar to a tooth
what are examples of standard dental cements?
- zinc phosphate
- zinc polycarboxylate
what are the 2 types of glass ionomer cement?
- conventional
- resin modified
what are the benefits of RMGIC as a luting agent?
- short setting time
- longer working time
- higher compressive and tensile strengths
- higher bond strength to tooth
- decreased solubility
what are the problems with RMGIC as a luting agent?
the monomer (HEMA):
- HEMA is cytotoxic
- HEMA swells, expands in wet environment (if used on porcelain crown, it may crack)
- No bond to indirect restoration
