-
What is the purpose of Intermediary materials
seal the dentin tubules keeping irritants out
-
Indirect restorations need to be ________ to the prepared tooth to aid in retention
luted on
-
What is the function of liners and what are the properties
- Thin layer to seal the dentin tubules to protect against bacteria & microleakage
- Less than 0.5mm placed in a paper thin layer and provide medication to aid the pulp rather than strength
-
What is the function of bases and what are the properties
- Thicker layers that provide thermal insulation and recreate areas of lost tooth structure to aid in retention/resistance forms of the permanent restoration
- Are at least .5mm thick and require strength to provide support for the restorative
-
What are the function of cements
Thin layer that lutes an indirect restoration to the preparation aiding retention
-
Name some liners
- Cavity Varnish
- Zinc Oxide Eugenol
- Glass Ionomers
- Calcium Hydroxide
-
Cavity varnishes are made out of ________ suspended in a volatile liquid like ________
- Copal resin (derived from trees)
- acetone or chloroform
-
What are the features of Zinc Oxide Eugenol
- extremely versatile material
- Made up of Zinc oxide powder + Eugenol
- Obtundent (soothing) effect when applied to dentin.
- Highly irritating placed directly on pulpal tissue
- Never used beneath composites
-
What are the features of Calcium Hydroxide liner
- a very basic material (pH around 11).
- used in a paste/paste system mixed on paper pads
- Placed in a very thin layer in the deepest area of the preparation, closest to the pulpal tissue.
- Spurs the development of secondary dentin. Also has bacteriostatic action
-
Secondary dentin grows in place of
pulpal tissue
-
______of CaOH stimulates the formation of ______
-
When injured the tooth responds with ______
tertiary or reparative dentin
-
What are Indirect pulp caps used for
Very deep caries near pulp. Place CaOh on deepest, hardest layer of carious dentin and seal under temporary restoration for several weeks/months. Wait for creation of secondary dentin. Then, remove the remaining carious dentin leaving the new dentin layer, and place the restoration
-
How are direct pulp caps used
Place CaOh directly on exposed pulp tissue (small, bleeding) and seal under “permanent” restoration
-
What are the features of Mineral Trioxide Aggregate - MTA liners
- Newer material used for pulp capping and as endodontic medicament
- High pH
- Seals better than CaOH and leads to dentin regeneration
-
What is the composition of Mineral Trioxide Aggregate - MTA liners
Made of 80% Portland cement and bismuth oxide
-
Name the cements
- Zinc Phosphate
- Polycarboxylate
- Glass Ionomer
- Resin Modified Glass Ionomers
- Resin Cements
- Zinc Oxide Eugenol (ZOE)
-
What is the oldest luting agent
Zinc Phosphate cement
-
What are the features of Zinc Phosphate
- Formerly used as base as well as cement
- Low initial pH can injure pulp and requires pulpal protection
- Water soluble
- Not used any more
- Very technique sensitive
-
What is the composition of the powder and liquid of zinc phosphate
- Powder (Zinc oxide)
- Liquid (Phosphoric acid/water)
-
Retention of restoration of zinc phosphate cements comes from ________ of cement and tooth structure
mechanical interlocking
-
What is the technique used for zinc phosphate
Liquid ratio, temperature of slab, portioning. All to handle exothermic heat of reaction and the pH problem.
-
First chemically adhesive cement
Polycarboxylate Cement
-
What are the features of Polycarboxylate Cement
- Brand name Durelon
- Powder (Zinc oxide)
- Liquid (Polyacrylic acid/water)
- Low pulpal irritation due to size of the polyacrylic acid molecule relative to the size of the dentinal tubule
-
Glass Ionomer Cements are can be used as
liner, base, or cement
-
What are the three types of Glass Ionomer Cements and what are they used for
- Type I – Luting
- Type II – Restorations (Class V)
- Type III – Liner or base
-
What is the composition of glass ionomer cements
- Powder (Finely ground particles of acid soluble glass containing Ca, Fl, Al)
- Liquid (Copolymer of polyacrylic acid / water)
-
Very commonly used cement for all metal or metal/ceramic restorations
Glass ionomer
-
What are some features of glass ionomer
- Fluoride is released as the cement ages
- Chemical adhesion via polyacrylic acid
- Pulpal irritation during initial use from desiccating pulp
-
Resin Modified Glass Ionomer is used as a
a luting agent, a liner, or a base
-
How is Resin Modified Glass Ionomer used and what is the composition
- Delivered in premeasured cartridges
- Polyacrylic Acid / Water
- Glass particles
- Resin
-
Which cement has the best bond
Resin cements
-
What are the features of Resin Cements
- Used for luting all ceramic restorations.
- Fluid composite
- Dual (chemical and light cured)
-
What are the features of Zinc Oxide Eugenol cement
- Can be used as temporary luting agent, permanent luting agent, temporary filling material, cavity liner, thermal insulating bases
- Powder (Zinc oxide)
- Liquid (Oil of cloves)
-
To use the zinc oxide eugenol as permanent cement, reinforce with
EBA
|
|
