Cements and Their Uses Flashcards
TYPES OF
CEMENTS
(6)
ZINC PHOSPHATE ZINC OXIDE EUGENOL ZINC POLYCARBOXYLATE GLASS IONOMER RESIN-MODIFIED GLASS IONOMER PROVISIONAL CEMENTS
IT IS IMPORTANT TO NOTE THAT NO
CEMENT WILL PERFORM TO IT’S OPTIMAL
LEVEL CLINICALLY WITHOUT AN ADEQUATE
PREPARATION THAT INCLUDES (2)
GOOD
RESISTANCE AND RETENTION FORM.
READ INSTRUCTIONS CAREFULLY-
MIXING,
HANDLING AND PHYSICAL PROPERTIES
VARY.
skipped
CEMENTS (8)
BIOCOMPATIBILITY RETENTION MECHANICAL PROPERTIES-withstand occlusal forces, high tensile strength MARGINAL SEAL LOW FILM THICKNESS EASE OF USE RADIOPACITY AESTHETICS
FIRST CEMENT APPEARING IN DENTAL LITERATURE
ZINC
PHOSPHATE
IS THE STANDARD WHICH OTHER CEMENTS ARE ASSESSED (GOLD STANDARD).
ZINC
PHOSPHATE
ZINC PHOSPHATE advantage (4)
THIN FILM THICKNESS AND PROVEN RELIABLITY.
LOW SOLUBILITY WHICH RESISTS BREAKDOWN IN THE MOUTH
LOW THERMO-CONDUCTIVITY. PROVIDES LESS SENSITIVITY TO HOT AND COLD
LONG SHELF LIFE
ZINC PHOSPHATE disadvantage (6)
INITIAL LOW pH-can lead to pulpal irritation
NO CHEMICAL ADHESION/BOND
NO ANTIBACTERIAL PROPERTIES
POOR ESTHETICS ( for all porcelain )
LONG SETTING TIME: 2.5-8 MINS.
EXOTHERMIC
EXOTHERMIC
-chilled glass slab when mixing, small amounts of powder added to liquid.
— TYPES OF ZOE, WHICH DIFFER IN THEIR
PROPERTIES AND USES.
TWO
TYPE I-
is less strong and is used for temporary
restorations and for temporary cementation.
TYPE II-
is reinforced and is stronger. It is
referred to as an intermediate restorative. It
can last for 6-12 months in the mouth. Used for
a tooth that cannot be restored immediately
BENEFIT OF ZOE IS –
NEUTRAL pH. IT HAS A
SEDATIVE OR SOOTHING EFFECT ON THE DENTAL
PULP. A PROTECTIVE OR INSULATING BASE OR
LINER IS NOT REQUIRED.
ZINC OXIDE EUGENOL (ZOE)- CEMENT NOT USED UNDER COMPOSITE OR ACRYLIC RESTORATIONS BECAUSE (2)
EUGENOL IS
INCOMPATIBLE WITH THESE MATERIALS AND ALSO
RETARDS THEIR SETTING PROCESS.
THE TYPE AND
INTENDED USE OF THE
MATERIAL DETERMINE
WHETHER
THE POWER IS INCORPORATED INTO THE LIQUID IN INCREMENTS OR ALL AT ONCE.
THE MIXING TIME IS
USUALLY
30-60
SECONDS.
SETTING TIME IS
APPROXIMATELY
3-5
MINUTES
DEVELOPED IN 1968 TO CIRCUMVENT PULPAL
PROBLEMS ASSOCIATED WITH LOW Ph.
ZINC
POLYCARBOXYLATE
FIRST CEMENTING SYSTEM TO OBTAIN AN
ADHESIVE AGENT THAT BONDED TO ENAMEL &
DENTIN.
ZINC
POLYCARBOXYLATE
ZINC
POLYCARBOXYLATE
action
antibacterial
ZINC
POLYCARBOXYLATE
working time
shorter: 2-5 min
ZINC
POLYCARBOXYLATE
mixing
NEEDS TO BE MIXED QUICKLY (30-40 sec).
POLYCARBOXYLATE
powder incorporated in
large quanitties
POLYCARBOXYLATE
fragility
not as fragile as zinc phosphate
POLYCARBOXYLATE
CAN HAVE POOR —DUE TO
FILM THICKNESS
MARGINAL SEALING
POLYCARBOXYLATE
SOMETIMES DOESN’T SUPPORT — STRESS
AS WELL AS NEWER CEMENTS
OCCLUSAL
POLYCARBOXYLATE
WILL BOND TO MOST ALLOYS BUT NOT TO —
GOLD
POLYCARBOXYLATE
DUE TO ITS POTENTIAL FOR PLASTIC
DEFORMATION IT IS MUCH MORE DIFFICULT TO
REMOVE EXCESS CEMENT
POLYCARBOXYLATE
ALTHOUGH BONDS WELL TO — ITS
USE HAS LESSENED OVER THE YEARS
ENAMEL/DENTIN
DURELON-
ZINC POLYCARBOXYLATE
USED WORLDWIDE 1972 EXCEPT US-1977.
KNOWN AS AN ACID-BASE CEMENT.
GLASS IONOMER
PART OF THE SUCCESS OF GLASS IONOMER
CEMENTS IS THEIR PERFORMANCE IS GOOD EVEN
IF
THEY HAVE NOT BEEN PROPERLY MIXED.
GLASS IONOMER
thickness
very thin film thickness
GLASS IONOMER
moisture tolerance and solubility
extremely moisture tolerate
fairly soluble
GLASS IONOMER
ONE OF THE IMPORTANT
ADVANTAGES.
FLUORIDE RELEASE-
IT CAN BE SUSTAINED FOR LONG
PERIODS OF TIME.
GLASS IONOMER
FLUORIDE-INITIAL RAPID RELEASE FOLLOWED BY
A SUSTAINED,LOWER LEVEL DIFFUSSION
RELEASE.
GLASS IONOMER
FLUORIDE RELEASE INCREASES IN —
CONDITIONS AND WILL — THE pH
(BUFFERING).
ACIDIC
INCREASE
GLASS IONOMER
HELPS PROTECT THE TOOTH/MARGINS FROM
FURTHER
TOOTH DECAY.
GLASS IONOMER
radiograph
radioopaque
GLASS IONOMER
MULTI-USES- (3)
CONTAINS SILVER PARTICLES FOR
LINER,
LUTING AGENT,
BUILD-UP MATERIAL( Ketac-Silver, Miracle Mix).
strength
EARLY 1990’S- TO OVERCOME THE HIGH
SOLUBILITY OF GLASS IONOMERS.
CEMENTS-RESIN-
MODIFIED GLASS
IONOMERS
CEMENTS-RESIN-
MODIFIED GLASS
IONOMERS
ADDED
HYDROPHILLIC METHYACRYLATE
MONOMERS.
CEMENTS-RESIN-
MODIFIED GLASS
IONOMERS
what kind of cememnt
acid-base
CEMENTS-RESIN-
MODIFIED GLASS
IONOMERS
adv and disadv
ALL THE SAME BENEFITS/ADVANTAGES OF GLASS
IONOMER CEMENTS.
DISADVANTAGES-LOW EARLY STRENGTH AND
MOISTURE SENSITIVITY DURING SETTING.
CEMENTS-RESIN-
MODIFIED GLASS
IONOMERS
usually takes – hrs for the final set
24
GLASS IONOMERS
IN GENERAL
WORKING TIME CAN AFFECT FILM THICKNESS-
LONGER WORKING TIMES ALLOW MORE FLOW
AND WILL AID IN SEATING THE RESTORATION.
GLASS IONOMERS
IN GENERAL
ONCE THE MATERIAL BEGINS TO SET, THE (2)
VISCOSITY RISES RAPIDLY & FLOW BECOMES
IMPOSSIBLE.
GLASS IONOMERS
IN GENERAL
EXTREMELY IMPORTANT THAT MIXING AND
PLACEMENT OF THE CEMENT IS COMPLETED
WITHIN
2-2.5 MINUTES
CEMENTS-PROVISIONAL/TEMPORARY
KEY ROLE IS
KEEPING THE TEMPORARY
RESTORATION ON THE TOOTH WHILE THE
PATIENT IS WAITING FOR THE FINAL
RESTORATION TO RETURN FORM THE LAB.
CEMENTS-PROVISIONAL/TEMPORARY
NEEDS TO BE EASILY REMOVED FROM PREPARED
TOOTH WITHOUT HARMING
(3)
PERIODONTIUM,TOOTH PREPARATION, OR PULP.
CEMENTS-PROVISIONAL/TEMPORARY
MOST HAVE
EUGENOL (ZOE)-although eugenol
can have a negative effect on acrylic resins and
composite resin cements.
CEMENTS-PROVISIONAL/TEMPORARY
THE EUGENOL PROVIDES
ANTIBACTERIAL EFFECT
TEMP (3)
-BOND, ULTRA-TEMP, RELYX TEMP
CEMENTS-
PORVISIONAL/TEMPORARY
When selecting (4)
HOW LONG
HOW RETENTIVE
WHAT WILL PERMANENT CEMENT BE
WORKING IN AESTHETIC ZONE
