Module 5 - Cement

Question 1

Materials made from two components, powder, and
liquid, mixed together.

Answer 1

Dental cements

Question 2

Component of dental cement

Answer 2

liquid = acid
powder = base
mixing –> acid-base reaction

Question 3

Use of dental cements (3)

Answer 3

1. luting agent
2. pulp protection/cavity sealer
   
   • cavity varnish
   • liner
   • base
3. filling
   
   • temporary filling
   • permanent filling

Question 4

General requirements for cement

Answer 4

1. biocompatibility
2. retention
3. high tensile strength, fracture toughness, fatigue strength
4. good marginal seal
5. low film thickness
6. ease of use
7. radiopacity
8. esthetics

Question 5

how much layer of cement for base is applied under restoration to protect pulp against injuries

Answer 5

> 0.75mm

Question 6

classification of cement bases

Answer 6

1. type I - luting cement
2. type II - permanent cementation
3. type III - temporary restoration
4. type IV - cavity liner

Question 7

types of dental cements (5)

Answer 7

1. zinc oxide eugenol
2. Glass ionomer
3. Calcium hydroxide
4. Polycarboxylate
5. Zinc phophate

Question 8

working time and setting time of type 1 fine grain

Answer 8

3-6 minutes, 2.5-8 minutes

Question 9

used for the permanent cementation of cast restorations such as crowns, inlays, onlays, and bridges

Answer 9

type I (fine grain)

Question 10

recommended for use as insulating base for deep cavity preparations

Answer 10

type II (medium grain)

Question 11

how to increase the setting time

Answer 11

1. reducing powder/liquid ratio (not recommended)
2. mixing on the cool glass slab (no moisture)
3. Mixing over a large area. Mixing cements by increments

Question 12

composition of ZOE powder

Answer 12

• zinc oxide (principal)
• rosin (to reduce the brittleness of the set cement)
• zinc stearate (plasticizer)
  -zinc acetate (improve strength)

Question 13

Composition of ZOE liquid

Answer 13

eugenol and olive oil

Question 14

Types of ZOE Cement

Answer 14

1. Reinforced ZOE
2. Simple ZOE
3. EBA (ethoxy benzoic acid) and Alumina Modified Zinc oxide Cement

Question 15

this is classify as sedative effect

Answer 15

reinforced ZOE

Question 16

Lower strength than zinc phosphate cement. Usually used as temporary filling.

Answer 16

Simple ZOE

Question 17

this tests for proper consistency for luting

Answer 17

string test

Question 18

Also called zinc polyacrylate cement

Answer 18

Polycarboxylate cement

Question 19

The first adhesive cement . Bond to tooth structure and metal

Answer 19

Polycarboxylate cement

Question 20

composition of Polycarboxylate cement (powder & liquid)

Answer 20

Powder
- zinc oxide
- magnesium oxide
- stannous fluoride

Liquid
- Aqueous solution of polyacrylic acid
- other carboxylic acid

Question 21

This is used as permanent cement for cast restorations, stainless steel crowns, and orthodontic bands

Answer 21

polycarboxylate

Question 22

used as nonirritating base under both composite or amalgam restorations

Answer 22

polycarboxylate

Question 23

used as an intermediate restoration

Answer 23

polycarboxylate

Question 24

Zinc phosphate cement ratio of type 1 - luting cement

Answer 24

Ratio 4 - 4