Bases and Liners

Question 1

Initial stage

Answer 1

Outline form, initial depth
Resistance
Retention
Convenience

Question 2

Final Stage

Answer 2

Remove remaining pits, fissures, infection
Pulp protection
Secondary retention/resistance
Finish enamel walls
Cleaning/inspecting/conditioning

Question 3

What liners are used only for amalgam

Answer 3

Copal varnish

Question 4

RDT greater than 2mm

Answer 4

Amalgam

Liner

Question 5

Percent sealing with copal varnish

Answer 5

1 layer: 55 percent

2 layers: 85 percent

Question 6

Base thickness

Answer 6

1-2mm

Question 7

Mixing CaOH vs ZOE

Answer 7

CaOH equal portions

ZOE: 2-3 drops per scoop powder

Question 8

Advantages of GI over ZnPO4

Answer 8

Adheres to tooth structure
Fluoride release
Retention
Dimensionally stable

Question 9

Conditioning dentin

Answer 9

Cleans smear layer

Leaves smear plugs

Question 10

Ions released from GI

Answer 10

Ca chelates acid polymer
Al replaces Ca
Fe released

Question 11

Reparative dentin formation

Answer 11

15 days cells differentiate
30 days microscopic reparative dentin
100 days radiographic repartive dentin

Question 12

Dycal

Answer 12

CaOH: releases hydroxide ions, stimulates odontoblast formation
Pulp capping

Question 13

What to use for .5mm

Answer 13

CaOH2 liner
GI/RMGI base
Copal Varnish liner
Amalgam