Unit 3 - Chapter 45

Luting cement is classified as what type?

Type I (1) cement

restorative material classifies as what type?

Type II (2) cement

liners and bases classify as what type?

type III (3) cement

to cause something to break up and gradually disappear

dissipate

chemical reaction that releases energy or heat

exothermic reaction

cement-type substance used to seal/join/glue a surface

luting

temporary coverage that would be changed to permanent coverage

provisional

to slow down a process

retard

to mix using a spatula-type instrument

spatulate

luting agents for long-term cementation such as crowns, bridges, inlays, onlays, veneers, orthodontic appliances

permanent cement

provisional coverage that is needed when when the dentist needs to remove at a later date if tooth is sentitive or waiting for the lab tech

explain the 4 variables that affect the integrity of cement

1. mixing time: must be mixed in time before setting

2. humidity: warm air adds moisture to powder and pulls moisture from liquid

3. powder to liquid ratio: must be correct ratios, always fluff/roll powder and drop liquid straight upright

4. temperature: use a cool dry glass slab to control the exothermic reaction

list the 5 types of dental cements

1. glass ionomer

2. composite resin

3. zinc oxide-eugenol

4. polycarboxylate

5. zinc phosophate

Most versitle cement, restorative material that chemically bonds to enamel, dentin, and metallic materials

glass ionomer cement

qualities of glass ionomer

• thin film thickness

• low solubility

• releases fluoride

• self-curing & light curing

• adheres to moist tooth surfaces

brands of glass ionomer

• fuji

• ketac-cem

• vetribond

• rely-X

how is glass ionomer suppled and mixed?

• suppled in powder & liquid or premeasured capsuled dispensed with syringe

• mixed on paper pad / glass slab

what order do you dispense cement

powder first

liquid second

what cement generates heat due to exothermic reaction → therefore needs a cool glass slab

Zinc Phosophate

6 types of ionomer cement

1. Type I: luting used for indirect restorations

2. Type II: restoring areas of erosion

3. Type III: used as liner and base

4. Type IV: sealants

5. Type V: cementation of orthodontic bands and brackets

6. Type VI: Core build-ups (rebuilding tooth for crown)

luting of indirect restorations such as crowns, bridges, inlays, onlays, veneers, orthodontic appliances

composite resin cement

qualities of composite resin cement?

• thin film thickness

• low solubility

• high strength

• light cured & dual cured

what is an important step before placing composite resin cement

tooth must be free of all plaque and debris and must be prepared by etching or treating surface with bonding system before cementation

how is composite resin suppled and mixed?

• powder & liquid

• syringe-type applicator with base & catalyst

Mixed on paper pad

can resin cements be used under metal castings?

Yes

cement used as a liner & base, has a soothing effect on the pulp and is often used when patients have sensitivity, strong (clove -like) odor

Zinc Oxide-Eugenol (ZOE) cement

4 types of Zinc Oxide-Eugenol (ZOE) cement, how they are supplied & mixed?

1. Type I: temporary cementation, lacks strength, 2-paste system mixed on paper pad

2. Type II: permanent cementation with reinforcing agents, liquid & powder, mixed on oil-resistant pad

3. Type III: temporary cement for cavities

4. Type IV: cavity liner

Brand of ZOE cement

Tempbond

permanent cement for cast restorations, stainless steel crowns, and orthodontic bands that is nonirritating and versitile

Polycarboxylate cement

Brand of Polycarboxylate cement

Durelon

How is Polycarboxylate cement suppled & mixed?

• supplied in liquid (syrup-like consistency) & powder with bottles or syringes

• mixed on paper pad or cool glass slab

Zinc Phosophate cement

1. Type I (fine grain): permanent cementation for crowns, inlays, onlays, and bridges

2. Type II (medium grain): base for cavities

can Zinc Phosophate cement be irritating?

Yes, a liner, sealer, or desensitizer should be places first to reduce sensetivity due to phosophoric acid

Brand of Zinc Phosophate cement

Fleck’s

How is Zinc Phosophate cement supplied & mixed?

• liquid and powder

• divided into incriments

• add powder to liquid mixed on cool glass slab - due to exothermic reaction

Chemical makeup of Zinc Phosophate cement

• liquid: 50% phosophoric acid (irritating)

• Powder: 90% zinc oxide and 10% magnesium oxide

Do you fill or line a crown with cement?

Line

what happens if excess cement is not removed?

can cause inflammation around tongue and gums - cement removal is an expanded function for DA’s

What is the patient to do for an indirect restoration?

bite down for a few minutes on cotton roll for the setting process

What is the basic setup for excess cement removal?

1. Instruments: explorer, mouth mirror, scaler, spoon evacuator

2. Fulcrum: finger rest

3. Dental Floss: tie knots in floss to remove excess cement

When ready for use, properly mixed polycarboxylate cement should appear

Glossy

The zinc phosphate cement designed for the accurate seating of precision castings is

Type II

When you are preparing a crown for temporary cementation, you should

completely fill the crown with cement

Glass ionomer capsules are mixed

by mechanical trituration

When mixing zinc phosphate cement, a cool, dry slab will ________ the setting time

increase

The cement that bonds directly with enamel, dentin, and metallic materials is

Glass ionomer

__________ is a temporary restoration placed on a tooth until a permanent restoration is placed

Provisional coverage