Crown Fitting and Cementation - Luting Cement Selection

Question 1

what is the luting cement?

Answer 1

the interface between cast restoration and the tooth

Question 2

what 3 factors determine which cement you may use?

Answer 2

• how much adhesion is required
• whether aesthetics is important
• if you want to remove the restoration

Question 3

give ideal properties of the cement.

Answer 3

1. prevents microleakage
2. mechanical properties
3. biocompatible
4. easy to use

Question 4

why is microleakage bad? (4)

Answer 4

• aesthetics damages
• increase chance of secondary caries
• can become sensitive
• pulpal damage

Question 5

describe what is meant by good mechanical properties

Answer 5

1. high compressive strength
2. low solubility - not to degrade
3. retentive
4. low film thickness

Question 6

why must the cement be biocompatible?

Answer 6

• not harmful to pulp
• not harmful to gingivae

Question 7

how can a cement be easy to use?

Answer 7

• good working time
• easy to clean up excess
• if it can be removed if necessary

Question 8

give the 3 types of cements that may be used.

Answer 8

Traditional
Glass Ionomer Cement
Resin Cement

Question 9

give the 2 types of traditional cements.

Answer 9

zinc phosphate
zinc polycarboxylate

Question 10

give the 2 types of GIC’s

Answer 10

traditional
resin modified

Question 11

give the 2 types of resin cements

Answer 11

multi-step adhesives
simplified and all in one adhesives

Question 12

what type of cement is zinc phosphate? give 4 good properties and 2 bad properties

Answer 12

traditional cement

1. long success
2. high compressive strength
3. low film thickness
4. 5 mins working time
5. macro-mechanical retention - not adhesive
6. highly soluble

Question 13

give 3 indications of which zinc phosphate - traditional cement would be used? zinc pocbate

Answer 13

cast post
full crown
conventional bridge

Question 14

what type of cement is zinc polycarboxylate? give 4 good properties and 1 bad property

Answer 14

traditional cement

1. good compressive strength
2. low film thickness
3. chemical adhesion to tooth
4. releases fluoride
5. highly soluble

Question 15

give 4 indications of which zinc polycarboxylate - traditional cement, may be used.

Answer 15

• full crown
• conventional bridge
• inlays/onlays
• temporary filling material

Question 16

what type of cement is RMGIC? give pros and cons

Answer 16

GIC

1. high compressive strength
2. low film thickness
3. chemical adhesion to teeth and base metals
4. releases fluoride
5. low solubility
6. requires dentine conditioner

Question 17

what is dentine conditioner?

Answer 17

citric acid - poly acrylic acid solution

• removes the smear layer to increase the bond between GIC and tooth

Question 18

give the indications for RMGIC.

Answer 18

• full crown
• conventional bridges
• inlays/onlays

Question 19

what type of cement is Resin Adhesive Multi Step? what are its 5 components?

Answer 19

• acid etch
• paste A and B
• liquid A and B
• metal and ceramic primer
• oxyguard

Question 20

give 6 properties of R-A-MS

Answer 20

resin cement

• dual cure resin composite system
• high bond strength
• high compressive strenght
• low film thickness
• releases fluoride
• low solubility

Question 21

what are the indications to R-A-MS?

Answer 21

full crown
conventional bridges
inlays/onlays
RRB
veneers
posts
bonded amalgam

Question 22

what type of cement is Resin-Adhesive-Simplified? what are the 2 components?

Answer 22

resin cement

• scotch bond universal
• rely-x ultimate cement

Question 23

give 6 properties of resin adhesive simplified.

Answer 23

• 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

Question 23

give indications of resin-adhesive simplified

Answer 23

full crown
conventional bridges
inlays/onlays
RBB
veneers
posts

Question 24

what is the only different indication you get from resin adhesive multi system vs resin adhesive simplified?

Answer 24

multi system bonds to amalgam

Question 25

what cement may you want to use for a FVC or MCC crown, that is more than 3mm tall and adequate taper?

Answer 25

RGMIC - fuji plus

Question 26

what cement may you want to use for a prep that isn't retentive? short crown or inlay/onlay?

Answer 26

adhesive resin cement - panavia or rely-x ultimate

Question 27

what cement may be ideal for a RBB

Answer 27

adhesive resin cement - panavia or rely-x ultimate

Question 28

what cement may be ideal for a fibre post?

Answer 28

adhesive resin cement rely-x ultimate

Question 29

what cement may be best for a cast metal post? and why?

Answer 29

traditional cement - zinc phosphate can be removed easily to re-endo