Quiz 8 Flashcards
What classification of cement adheres one surface to another?
Type I: luting agent
What classification of cement is used to temporarily restore a tooth?
Type II: Provisional/intermediate restorations
What classification of cement is used for pulpal protection?
Type III: Liners & Bases
How long is a provisional restoration used?
Couple weeks
How long is an intermediate restoration used?
Up to a year
What are the 3 differences of dental cements?
-Intended use
-Type/amount of ingredients
-Some cements mixed thicker or temporarily restore a tooth
What is primary consistency?
Lower viscosity
What is secondary consistency?
Thicker, putty-like
What is the main goal of a type I cement: luting agent?
-What’s the other function?
Retain a restoration
Prevent microleakage
What are the properties of dental cement?
Strength
Solubility
Viscosity
Biocompatibility
Retention
Esthetics
Radiopacity
Ease of manipulation
Anticariogenic properties
What cement is not frequently used as permanent restorations?
Type II: provisional/intermediate
What is thicker than primary consistency?
Secondary consistency
What cement is used to seal and medicate pulp (thin)?
Type III: Liners
What are 3 types of Type III cement: Liners?
Calcium hydroxide
Resin-modified glass ionomer
Bonding agent
stimulates reparative dentin and protects when cavity prep is close to pulp (indirect or direct pulp cap)
Calcium hydroxide
What is an indirect pulp cap?
Not in pulp cap yet
What is a direct pulp cap?
right on top of pulp chamber
Seals tubules and releases fluoride
-Most commonly used today
Resin-modified glass ionomer
Seal dentinal tubules
Bonding agent
Used to provide thermal insulation or mechanical support for pulp, thick
Type III cement: Bases
What are the 2 types of Type III cement: Bases?
Low-strength
High-strength
What is a low-strength base?
Zinc-oxide eugenol ZOE
What are the high-strength bases?
Reinforced ZOE
zinc phosphate
polycarboxylate
glass ionomer
resin-modified glass ionomer
resin
What are the dental cement liquids?
Eugenol
Phosphoric acid
Polyacrylic acid
Organic, weak acid, oil of cloves
Obtundent: sedative to pulp
Not used with composites
Eugenol
Very acidic, irritating to tissues
Humidity affects mix
Discard liquid if cloudy
Phosphoric acid
Half water
Very viscous
Dispense only when ready to mix
Dispense carefully as drops run together, distorts amount
Polyacrylic acid
What are the 2 dental cement powders?
Zinc oxide
Powdered glass
Aluminum oxide added for strength
Magnesium oxide added to extend working time
Zinc oxide
Silicon oxide with added sodium, calcium, and potassium oxides to mix with acid
Fluoride added
Powdered glass
What is the resulting cement of eugenol + zinc oxide powder?
Zinc oxide-eugenol ZOE
What is the resulting cement of eugenol + glass powder?
No reaction
What is the resulting cement of phosphoric acid + Zinc oxide powder?
Zinc phosphate cement
What is the resulting cement of phosphoric acid + glass powder?
Silicate cement
What is the resulting cement of polyacrylic acid + zinc oxide powder?
Polycarboxylate cement
What is the resulting cement of polyacrylic acid + glass powder?
Glass ionomer cement
powder/liquid ratio depends on use
ZOE + zinc phosphate
Determined by manufacturer
Mix too slow = too thick and decreased adhesion
Polycarboxylate + glass ionomer
o Used when strength/solubility not critically important
*High solubility
o Paste/paste or liquid/powder mixes
o Consistency: lutes to 1 inch string (stretch)
o Uses: temporary fillings, bases, sedative effects
*Not used with composites
o Smooth & creamy
o Clean up with baking soda/water
Zinc oxide-eugenol ZOE
o Oldest cement, not widely used (soluble, weaker than newer cements)
o Thinner/thicker mix determined by intended use
o Exothermic reaction when mixed
*Mix incrementally on cool glass slab
o Acidic until set = irritating to pulp
*Liner/varnish used first
o Consistency: lutes to 1 inch string
o Uses: luting indirect restorations, as base if liner/varnish used
Zinc phosphate cement
o Old cement
o No longer used today
o Acidic, irritating to pulp
o Soluble, leaked
o Once used for esthetic restorations
Silicate cement
o First cements with adhesive bond to tooth structure
o Minimal irritation to pulp
o Not very strong, higher solubility compared to glass ionomers/resin cements
o Place when mix still glossy (do not use if no glass/cobwebs)
*Short working time
o Uses: long-term temporary cements, final cementation of indirect restorations
Polycarboxylate cement
o Developed as an alternative to silicate cement
o Popular today for fluoride release and sealing dentin, bonds to tooth structure
o Most popular for luting metal and PFM crowns
o Resin-modified glass ionomer cements strongest, least soluble
o Uses: restorations, bases, liners, cements, class V restorations
o Powder/liquid or capsule/gun dispensed
o Cement when glossy, loss of adhesion if no gloss
o Clean quickly with alcohol
Glass ionomer cement
o Composites with high resin/low filler content (low viscosity)
o Bond restorations to tooth structure
o Uses: bonding ceramic restorations, crowns/bridges, bonding ortho brackets
o Useful for recementing poor/ill-fitting crowns
o Insoluble in mouth, superior bond strength to enamel/dentin
o Paste/paste systems, mixed on paper pad
Resin-based (composite) cement
o Cement used as surgical dressing
o Paste/paste system
o ZOE once used
* Irritating to tissue, damage to exposed bone
o No eugenol in current formulations
Temporary cement / Perio pack
