Dental Cements Ch14 (W11)

Question 1

What is a thin layer of resinous material placed on the floor and walls of prep to seal tubules and minimize micro-leakage

Answer 1

Cavity varnish

Question 2

What is the purpose of a liner

Answer 2

Thin layer of material placed to protect the pulp

Question 3

What is a thick layer of cement used to protect the pulp from chemical and thermal irritation

Answer 3

Base

Question 4

What does luting refer to

Answer 4

Cementing two components togetehr

Question 5

In dentistry when the cement is set how does it appear

Answer 5

Hard and brittle

Question 6

Type I cements are

Answer 6

Luting agents

Question 7

What would you use a type I cement for? (Luting agent)

Answer 7

Glue crowns, bridges, onlays& inlays
Cement or bond ortho band/bracket
*can be perm or provisional

Question 8

Type II cements are used for

Answer 8

Provisional/intermediate restorations or long term

Question 9

Type II cements may include

Answer 9

Glass ionomer cements
Dental sealants

Question 10

Type III cements are

Answer 10

Bases or liners for cavity preps

Question 11

Strength of a cement is controlled by amount of

Answer 11

Powder incorporated

Question 12

The strongest dental cements are

Answer 12

Resin cements

Question 13

The weakest dental cement is

Answer 13

Zinc oxide eugenol

Question 14

Cements are ____ materials with good ____ strengths

Answer 14

Brittle; compressive

Question 15

Resin containing cements are

Answer 15

Insoluble cements

Question 16

Retention is accomplished by

Answer 16

Adhesion

Question 17

What are two types of adhesion

Answer 17

Mechanical
Chemical

Question 18

Interlocking of one material with another is what kind of adhesion

Answer 18

Mechanical

Question 19

At molecular level- ionic bonding or covalent bonding describes what kind of adhesion

Answer 19

Chemical

Question 20

In many dental applications, chemical and mechanical adhesion occurs

Answer 20

Together

Question 21

Adhesive agent will decrease? It aids in ?

Answer 21

Decrease microleakage
Aids in retention

Question 22

What are factors that may weaken the strength of adhesion between two materials

Answer 22

Coefficient of thermal expansion
Dimensional changes
Contamination

Question 23

Material with low viscosity =

Answer 23

Luting agent

Question 24

Luring cements help prevent microleakage by sealing the interface between the

Answer 24

Tooth and the restoration

Question 25

Luring cements are classified according to their composition; what are the 3

Answer 25

Water based Resin based Oil based

Question 26

Water based: zinc phosphate disadvantages

Answer 26

Pulp irritation Weaker than other cements Highly soluble (will wear away/wash away in time)

Question 27

Water based: zinc carboxylate advantages

Answer 27

Adheres to tooth structures Non irritating to pulp Inexpensive

Question 28

Disadvantages of zinc carboxylate

Answer 28

Higher solubility Short working time Lower strength

Question 29

Water based: glass ionomer cement advantages

Answer 29

Chemical adhesion to tooth and metal FLUORIDE RELEASE Easy to mix Moderate strength

Question 30

Water based: glass ionomer cement disadvantages

Answer 30

Postoperative sensitivity Does not bond to glazed porcelain Marginal solubility

Question 31

Resin based luting cements help increase retention of crowns or teeth with less than ideal preps. What are the 4 groups? (Insoluble)

Answer 31

Esthetic resin cements Adhesive resin cements Self adhesive resin cements Provisional resin cements

Question 32

Oil based luting cements: ZOE. What is it used for

Answer 32

Provisional cementation Provisional and intermediate restos Low strength bases Root canal sealers Perio dressing

Question 33

ZOE should NOT be used when because it may inhibit the set of the resin

Answer 33

Under composite restos or as provisional cement before final cementation with resin modified glass ionomer or resin cements.

Question 34

What causes pulpal irritation

Answer 34

Bacteria effect of caries Biologic response to chemicals in dental materials Cutting off tooth structure

Question 35

What can be used to act as protective layers between the dentin and the restorative material

Answer 35

Cavity varnishes Liners Bases

Question 36

Cavity varnish is applied in 2 or 3 thin layers where in the prep?

Answer 36

Floor and walls

Question 37

Cavity varnishes are used under what restos? What are they not used under?

Answer 37

Used under amalgam restos NOT used under composite resins

Question 38

What does a protective base do

Answer 38

Protects the pulp before the resto is placed

Question 39

What does an insulating base do

Answer 39

Protects the tooth from thermal shock

Question 40

What does a sedative base do

Answer 40

Soothes the pulp that has been damaged by decay or irritated by mechanical means

Question 41

Low strength base is aka

Answer 41

A liner

Question 42

Examples of low strength base (aka liner)

Answer 42

Calcium hydroxide (dycal) Class ionomer Zinc oxide eugenol (has sedative effect)

Question 43

What does a low strength base aka liner do?

Answer 43

-Provides minimal strength to support forces of condensation -stimulates growth of secondary dentin -provides a barrier btwn pulp & resto -used as a direct pulp capping agent

Question 44

High strength base is aka

Answer 44

Base

Question 45

What does a high strength base aka base do

Answer 45

-Provides thermal insulation & support for resto

Question 46

A base is placed in areas where there is less than

Answer 46

2mm of remaining dentin over the pulp

Question 47

What thickness is a base placed in

Answer 47

0.5mm or greater

Question 48

Examples of bases

Answer 48

Reinforced ZOE Zinc phosphate Zinc polycarboxylate Glass ionomer

Question 49

What is the purpose of surgical dressings

Answer 49

Provide protection and support for the surgical site Patient comfort Helps control bleeding

Question 50

What consistency are provisional and intermediate restorations mixed to

Answer 50

Secondary consistency

Question 51

ZOE should not be used as a base or provisional cement if

Answer 51

Composite resin or resin bonding agents are used

Question 52

Glass ionomer cements release what? Therefore what effect do they have

Answer 52

Release fluoride Have anti cariogenic effect

Question 53

Do Products that do not release fluoride, only contain fluoride have antiocariogenic effects?

Answer 53

No