Cements Flashcards
What cements have an an ACID-BASE setting mechansim:
Zinc phosphate
Polycarboxylate
Glass ionomer
What cement has both an ACID-BASE & POLYMERIZATION setting mechanism?
RMGI
What cements have a POLYMERIZATION setting mechanism?
Resin based
Self-adhesive resin based
Put in order of least to greatest amount of film thickness of the following cements; include values:
-zinc phosphate
-polycarboxylate
-glass ionomer
-RMGI
-Resin based
-Self-adhesive resin based
LEAST:
Glass ionomer (13.5)
Polycarboxylate (19)
RMGI (23.1)
Self-adhesion resin based (less than 25)
Zinc phosphate (25.3)
Resin based (29.6)
GREATEST)
Which cement has the greatest film thickness?
Resin based
Which cement has the least amount of film thickness?
Glass ionomer
Which cements have working times of up to 5 min?
Zinc phosphate (1.5-5)
Resin based (0.5-5)
Self-adhesive resin based (0.5-5)
Which cements have a setting time of 1-15 min?
Resin based & self-adhesive resin based
What cement has a setting time of 2 min?
RMGI
What cements have a setting time of 6-9 min?
Polycarboxylate & glass ionomer
What cement has the GREATEST compressive strength?
Self-adhesive resin based (200-240)
What cement has the LOWEST maximum compressive strength?
Polycarboxylate (67-91)
What cement has the ability to have the lowest (initial) compressive strength/
RMGI (41-141)
Which cements have the lowest tensile strength?
Zinc phosphate (3.1-4.5)
What cement has the greatest tensile strength?
self-adhesive resin based (37-41)
What cement has the greatest tensile strength, compressive strength and elastic modulus?
Self-adhesive resin based
Describe the pulp irritation caused by the following cements:
Glass ionomer:
RMGI:
Resin based:
Self-adhesive resin based:
HIGH
Describe the pulp irritation caused by the following cements:
Zinc phosphate:
Moderate
Describe the pulp irritation caused by the following cements:
Polycarboxylate:
Low
What cement would you used on someone with an already irritated pulp?
Polycarboxylate
What cements have HIGH solubility?
Zinc phosphate & polycarboxylate
What cements have VERY LOW solubility?
RMGI
Resin-based
Self-adhesive resin based
What cements have LOW solubility?
Glass ionomer
What cements have a high rate of miroleakage?
Zinc phosphate
Polycarboxylate (high to very high)
What cements have a low to very high microleakage rate (large range)?
Glass ionomer
What cements have very low mircoleakage rates?
RMGI
Resin-based
self-adhesive resin based
Describe the removal of excess cement for the following:
-zinc phosphate:
-polycarboxylate:
-glass ionomer
-RMGI:
-resin based
-self adhesive resin based
-zinc phosphate: EASY
-polycarboxylate: MEDIUM
-glass ionomer: MEDIUM
-RMGI: MEDIUM
-resin based: DIFFICULT
-self adhesive resin based: DIFFICULT
What cements have the highest retention?
Resin based & self-adhesive resin based
What cements have moderate retention?
Zinc phosphate & RMGI
What cement has moderate to high retention?
Glass ionomer
What cement has low to moderate retention:
Polycarboxylate
What cements displace micromechanical bonding to tooth structure/
resin based & self-adhesive resin based
How does RMGI bond to the tooth?
molecular and micromechanical
Which cements display molecular only bonding to tooth surface?
polycarboxylate & glass ionomer
Zinc phosphate bonds to the tooth through:
Nonadhesive
Which cements released fluoride?
Glass ionomer & RMGI
what are the absolute needs of cements?
- biocompatibility
- inert & noncorrosive
- insolubility to acid attack
- dimensional stability (minimal shrinkage & minimal expansion
What are the NEEDs of cements?
- set up quickly
- low surface tension
- adapts & adheres to anatomy
- insensitive to moisture during procedure
- fluoride release
- anti-microbial
- radiopaque
- cost effective
What are the wants of cements?
- low film thickness (can be spread to less than 25 micrometers)
- adequate strength
- low solubility
- reasonable setting time
- adequate working time
- cariostatic
- adhesion to tooth structure & restorative material
- high values for cyclic fatigue
- high values for strength