Conservative Dentistry 4 : 2-Liners And Bases/ First Semester

Front 1

Why is there "dentin sensitivity " ?

Back 1

Toxic products and stains from restorations.

Bacteria from the oral cavity.

Front 2

Define "Liners"

Back 2

aqueous or volatile organic suspensions or solutions

Their solvents evaporate quickly, leaving behind a film residue.

Front 3

What's the thickness of liners ?

Back 3

thin films usually not exceeding a thickness of 0.5 mm.

Front 4

What are the classification of liners ?

Back 4

1. Solution liners or Varnishes

2. Suspension liners

Front 5

What's the other name for solution liners ?

Back 5

Varnishes

Front 6

Talk about Solution liners or varnishes

Back 6

are solutions of natural gums (e.g. copal) or synthetic resins (e.g. nitrated cellulose) dissolved in organic solvents (such as chloroform, acetone or ether).

Front 7

Describe the mechinesm of action in which the varnishe help reduce pulp sensitivity

Back 7

When solvent evaporates it leaves behind a semi permeable membrane which can protect the dental pulp from toxic products of restorative materials as well as from microleakage of newly placed amalgam

Front 8

How do you apply the varnish ?

Back 8

Place a cotton pellet in the varnish, then swab the cleaned cavity. Air dry and reapply varnish. Air dry again to see a shiny hard surface which is ready to receive the gold or amalgam restoration

Front 9

Talk about the other type which is suspension liners

Back 9

These liners contain suspensions such as calcium hydroxide and or zinc oxide in a synthetic resin.

They are applied to provide a barrier against irritating compounds of most restorative materials.

Front 10

Give an examples to suspension liners

Back 10

E.G. are Pulpdent, Dycal and Life

Front 11

Talk about Dycal

Back 11

DYCAL® Radiopaque Calcium Hydroxide Composition is a rigid, self-setting material useful in pulp-capping, and as a protective base/liner under dental filling materials.

Shown to protect the pulp and promote the formation of secondary dentin

Easy to place, with ability to flow where needed while it stays in place when necessary

It is alkaline and has antibacterial activity

It neutralizes the acid from restorative materials

Front 12

Talk about the disadvantages of dycal

Back 12

Low tensile strength

Exhibit plastic deformation

Undergo hydrolytic breakdown and dissolve under acidic conditions.

Bacteria may decompose it. Hence it may disappear under restorations when there is microleakage.

Front 13

What are the systems avalbile for the dycal liner ?

Back 13

Single -paste system dycal

viable light cured dycal --> It utilizes the polymerization of dimethacrylate by means of light.

Front 14

Define base and catalyst

Back 14

Base - main or supporting ingredient in material.

Catalyst - substance that
initiates a chemical reaction

Front 15

What does the base provide ?

Back 15

May be placed in thick layers on the pulpal floors of deep cavities to provide thermal, chemical and electrical insulation for the dental pulp.

Front 16

what does the bases serves ?

Back 16

It servers a protective, therapeutic or structural function.

Front 17

Explain why Zinc Phosphate is irrtiant to the pulp ?

Back 17

- A pH of 1.6 is found after 2 minutes of mixing
- pH below 4 within the first hour
- pH 6 – 7 after 24 hours.

Front 18

what are the uses and charctrastics of Zinc Phosphate ?

Back 18

Cementing agent for crowns and FPDs.
Temporary restorations.

Insulating base.

Produces heat when mixed.

Front 19

What are the disadvantages of Zinc Phosphate ?

Back 19

It is soluble in oral fluids

It has no antibacterial properties

It is very soluble in organic acids

Front 20

Zinc Phosphate

Back 20

Phosophate

Front 21

Pheonlate

Back 21

Zinc Oxide Eugeonl Cement

Front 22

Talk about Zinc oxide eugoenl cement

Back 22

Zinc oxide powder + eugenol

It provides good marginal seal

It has antibacterial effects

It has anodyne (tranquilizer) effect

Front 23

List the disadvantages for Zinc oxide eugeonal cement

Back 23

Low compressive strength
Too long setting time
It stains the composite restoration

Front 24

What's "Fortified cement " ?

Back 24

Fortified cement is marketed by adding silica, alumina or resin to the powder or by
adding Orthoethoxybenzoic acid (EBA) to the liquid.

Front 25

Talk about "Reinforced Zinc oxide eugenoal cements "

Back 25

contains natural or synthetic resin to increase the compressive strength.

Front 26

Give an example of a reincorced zinc oxide eugeonal cements

Back 26

IRM

Front 27

Talk about IRM

Back 27

Temporary restoration up to 1 year

Base or a temporary cement

Front 28

Can we use IRM under compiste ?

Back 28

NO

Front 29

talk about EBA cements

Back 29

EBA (ethoxybenzoic acid) cements: contains alumina and polymeric reinforcing agent
Stailine is a commercial example.

Front 30

List the two forms for Glass inomer cements
والله اعلم هدول الـ
RMGI

Back 30

Powder = finely ground calcium aluminosilicate glass

Liquid = polyacrylic-itaconic acid
or other poly-carboxylate acid copolymers

Front 31

Talk about the "early glass inomer cements "

Back 31

Poor esthetics --> due to rough surface

Prolonged setting reaction

Poor wear resistance

Handling difficulties

Front 32

What are the modifctions done to glass inomer cements that made them what they are today ?

Back 32

Refined formulation --> addition of tartaric acid + more reactive acids

Improved packaging

Silver added to make radiopaque

Addition of resin

Front 33

List the advantages of glass inomer cements ( the one we use nowadays )

Back 33

Inherent (chemical) adhesion to tooth structure

Fluoride release

Coefficient of thermal expansion (CTE) similar to tooth structure

Biocompatible

It has high compressive strength

It is able to leach fluoride

It has good marginal seal. Why?

Front 34

List the uses and charactrsitics of GIC

Back 34

Cementing crowns and FPDs.
Temporary filling.
Base material.
resist recurrent decay

Front 35

List the Disadvantages of GIC

Back 35

Sensitive to moisture and desiccation
Low fracture toughness
Low flexure strength
Low wear resistance
Relatively poor esthetics

Front 36

List the idictions for GIC

Back 36

Direct restorative :
Class 5
Root caries
Pediatric dentistry
resin-modified version
Tunnel preparations
Atraumatic restorative treatment (ART)

Front 37

List the " Basic glass inomner " types

Back 37

Conventional GI :
traditional acid-base reaction

Resin-modified (RMGI) :
acid-base reaction
light and/or chemical cure

Front 38

Why did they create RMGI ?

Back 38

1) Attempt to comine benifets of :
1)GIC --> a) f release b) adhesion
2) compiste resin --> a) strength b)astehtics

2) Attempt to reduce :
1) GIC --> a) hydration senestivity b)deleayed set c)poor early strength
2)compiste --> a) polymarazation shrinkage b)microleakage c)recurrent carries

Front 39

Arrange the following materials from the weakest to the strongest : RMCI , GIC , COMPORES , COMPISTES

Back 39

GIC < RMGI < Compores < Compsites

compiste is the strongest

Front 40

Arrange the following materials from the most polishible to the least polishible : RMCI , GIC , COMPORES , COMPISTES

Back 40

GIC < RMGI < Compores < Compsites

compsite is the most polishible

Front 41

Arrange the following materials from the least fluoride release to the highest flouride release : RMCI , GIC , COMPORES , COMPISTES

Back 41

Compsite < composres < RMGI < GIC

GIC is the most F releasing cement

Front 42

Define Pascal

Back 42

It is a measure of force per unit area, defined as one newton per square metre

Front 43

Describe what we are the approprite steps we do when we're having a cavtiy that's exteinding 0.5 mm in dentine

Back 43

Coat the cavity with two layers of resin varnish using brush

No insulating cement base is required.

DON’T deepen a cavity by removing dentine in order to place an insulating base.

Front 44

As the previous question , but what will happen if the cavity penetrated more ?

Back 44

Place modified zinc oxide eugenol or GIC over the pulpal floor or axial wall.

Apply varnish before zinc phosphate but after GIC

Front 45

What are the advantages of doing these steps listed in the previous two quesitons ?

Back 45

Reduce the amount of required amalgam for cavity filling

Insulator

Reduce microleakage

Substitute dentin

Front 46

Describe what we are the approprite steps we do when we're having a cavtiy that's very deep ( only 0.5 mm left before entring the pulp )

Back 46

line with calcium hydroxide cement

Place cement base GIC

apply varnish

Place filling

Front 47

Talk about Vitrebond

Back 47

Is resin modified glass ionomer RMGI

3M ESPE

Vitrebond is light-cure glass ionomer liner/base.

It is recommend for use as a liner or base under composite, amalgam, metal and ceramic restorations.

Vitrebond Liner/Base is not indicated for direct pulp capping.

If a pulp exposure occurs, cover the exposure with a calcium hydroxide material. Place the Vitrebond liner/base over the calcium hydroxide and surrounding dentin to seal and protect the exposure.

Front 48

talk about compiste resin resotrations

Back 48

If the cavity is deep, line it with calcium hydroxide or Vitrebond

Shallow cavities: no need for lining or use dentine bonding agent instead

Recurrent caries: use light activated glass ionomer cement.

Front 49

DONT FORGET THAT I DIDN'T WRITE slide 45

Back 49

go check it you lazy