Crown Fitting and Cementation - Luting Cement Selection Flashcards
what is the luting cement?
the interface between cast restoration and the tooth
what 3 factors determine which cement you may use?
- how much adhesion is required
- whether aesthetics is important
- if you want to remove the restoration
give ideal properties of the cement.
- prevents microleakage
- mechanical properties
- biocompatible
- easy to use
why is microleakage bad? (4)
- aesthetics damages
- increase chance of secondary caries
- can become sensitive
- pulpal damage
describe what is meant by good mechanical properties
- high compressive strength
- low solubility - not to degrade
- retentive
- low film thickness
why must the cement be biocompatible?
- not harmful to pulp
- not harmful to gingivae
how can a cement be easy to use?
- good working time
- easy to clean up excess
- if it can be removed if necessary
give the 3 types of cements that may be used.
Traditional
Glass Ionomer Cement
Resin Cement
give the 2 types of traditional cements.
zinc phosphate
zinc polycarboxylate
give the 2 types of GIC’s
traditional
resin modified
give the 2 types of resin cements
multi-step adhesives
simplified and all in one adhesives
what type of cement is zinc phosphate? give 4 good properties and 2 bad properties
traditional cement
- long success
- high compressive strength
- low film thickness
- 5 mins working time
- macro-mechanical retention - not adhesive
- highly soluble
give 3 indications of which zinc phosphate - traditional cement would be used? zinc pocbate
cast post
full crown
conventional bridge
what type of cement is zinc polycarboxylate? give 4 good properties and 1 bad property
traditional cement
- good compressive strength
- low film thickness
- chemical adhesion to tooth
- releases fluoride
- highly soluble
give 4 indications of which zinc polycarboxylate - traditional cement, may be used.
- full crown
- conventional bridge
- inlays/onlays
- temporary filling material
what type of cement is RMGIC? give pros and cons
GIC
- high compressive strength
- low film thickness
- chemical adhesion to teeth and base metals
- releases fluoride
- low solubility
- requires dentine conditioner
what is dentine conditioner?
citric acid - poly acrylic acid solution
- removes the smear layer to increase the bond between GIC and tooth
give the indications for RMGIC.
- full crown
- conventional bridges
- inlays/onlays
what type of cement is Resin Adhesive Multi Step? what are its 5 components?
- acid etch
- paste A and B
- liquid A and B
- metal and ceramic primer
- oxyguard
give 6 properties of R-A-MS
resin cement
- dual cure resin composite system
- high bond strength
- high compressive strenght
- low film thickness
- releases fluoride
- low solubility
what are the indications to R-A-MS?
full crown
conventional bridges
inlays/onlays
RRB
veneers
posts
bonded amalgam
what type of cement is Resin-Adhesive-Simplified? what are the 2 components?
resin cement
- scotch bond universal
- rely-x ultimate cement
give 6 properties of resin adhesive simplified.
- self adhesive dual-cure resin composite
- high bond strenght to tooth and metal alloys
- high compressive strength
- low film thickness
- low solubility
- built in metal and ceramic primers
give indications of resin-adhesive simplified
full crown
conventional bridges
inlays/onlays
RBB
veneers
posts
what is the only different indication you get from resin adhesive multi system vs resin adhesive simplified?
multi system bonds to amalgam
what cement may you want to use for a FVC or MCC crown, that is more than 3mm tall and adequate taper?
RGMIC - fuji plus
what cement may you want to use for a prep that isn’t retentive? short crown or inlay/onlay?
adhesive resin cement
- panavia or rely-x ultimate
what cement may be ideal for a RBB
adhesive resin cement
- panavia or rely-x ultimate
what cement may be ideal for a fibre post?
adhesive resin cement
rely-x ultimate
what cement may be best for a cast metal post? and why?
traditional cement
- zinc phosphate
can be removed easily to re-endo
