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Restorative > Lining And Base Cements > Flashcards

Lining And Base Cements Flashcards

0
Q

What are the three functions of lining materials?

A

Therapeutic
Protective
Structural

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1
Q

What is a lining material?

A

Placed as an intermediary between dentine and restorative material

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2
Q

What are the therapeutic functions of lining materials?

A

Stimulate odontobalsst
Encourage remin
Bactericidal

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3
Q

What are the protective functions of linings?

A

Against thermal stimuli: metallic fillings readily transmit heat to underlying dentine
Chemical: some restorative materials are cytotoxic to pulp
Galvanic: this is thr flow of ions when dissimilar metals contact

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4
Q

What can micro leakage result in?

A

Sensitvity
Recurrent caries
Tooth discolouration

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5
Q

Why are the structural functions of linings?

A

Reduce the amount of filling material
Make the cavity shape less complex
Allows restoration with an inlay since blocks out undercuts and smooths walls

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6
Q

What are the ideal properties of a dents cement?

A 
High early compressive strength 
Strong even in thin cross section 
Good pulp response
Bactericidal
Radiopque 
Not react with filling material
Easy to mix
Adequate working time 
Short setting time
Seal odontoblasts tubules
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7
Q

What are the type of dental cements available?

A 
Calcium hydroxide
Zinc oxide eugenol
Zinc phosphate 
Zinc polcarboxylate
Polyalkenoates
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8
Q

How many pastes are there in CaOH paste 1 and paste 2?

A

Base: Paste 1: CaOH, ZnO, Zn stearate, ethyl toluene , sulfonamide

Catalyst: Paste 2: glycol salicylate, titanium dioxide, calcium sulfate, calcium tungstate

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9
Q

What are the advantages of CaOH?

A

Bactericidal to some groups of organisms
Stimulate relative dentine
Remin of altered dentine

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10
Q

What is in the Zn OxidenEugenol cements?

A

Powder: ZnO, Zn stearate and modifying agents: alumina, PMMA, polystyrene, polycarbonate

Liquid: eugenol (phenolic ether) and modifying agents: ethoxybenzoic acid

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11
Q

What are the properties of ZOE?

A

Bland
Phenolic ether provides bactericidal properties
Not compatible with composite as it plasticises Bis GMA

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12
Q

What are the cements bases on ZnO aluminium silicate glass?

A

Zn Phosohate
Zn Polycarboxylate
Silicate cements
Glass ionomer cements

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13
Q

What are zinc phosphate cements ?

A

Powder: Zn oxide and other metallic oxides
Liquid: buffered phosphoric acid and Zn and Al phosphate buffers

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14
Q

What happens on mixing Zn Phosphate is mixed?

A

Exothermic reaction so must be mixed on a glass slab

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15
Q

How is ZnPhosphate made?

A

The powder is made at 1000 degrees to reduce reactivity and MgO helps compressive strength

16
Q

What is the purpose of buffers in the liquid of Zn phosphate cement?

A

To provide adequate working time

17
Q

What is the pH of Zn phosphate cement at time of placement?

A

1.3 to 3.6

18
Q

How long does it talks zinc phosphate to become neutral ?

A

24 hours

19
Q

T/F Zn Phosohate cement has a low tensile strength ?

A

T but this means it is brittle

20
Q

How soluble is Zn phosphate once it sets?

A

Low

21
Q

What are zinc polcarboxylate cements made from?

A

Powder: Zn oxide And Mg O
Liquid: poly acrylic acid

22
Q

What are the advantages of Polycarboxylate cements?

A

Antibacterial
Form weak bond to enamel and dentine
Bonds to stainless steel and tin plated restorations

23
Q

What are the polyalkelonate cements made from?

A

GIC

Powder: sodium alumina silicate glass, calcium fluoride, pigments, freeze dried poly acid
Liquid: distilled water

24
Q

What are the advantages of polyalkelonate cements?

A

Biocompatible
Fluoride effect
80% strength in one hour
Bonds to non Prescious metal alloys

25
Q

What is the function of increasing the AL:Si ratio?

A

This makes the glass more reactive for weaker polyacids

26
Q

What type of cavity liners are?

A

Varnishes
Bonding resins
Light curing glass ionomer cements

27
Q

What are the components of cavity liners?

A

Solute: copal resin, shellac, zinc oxide, calcium OH

Solvent: ether, acetone, chloroform

28
Q

What is the compressive strengths of the various lining and cements?

A 
CaOH : 10Mpa by 90 seconds
Zinc OxidenEugenol: 5-50Mpa 
Zinc phosphate: 140Mpa
Zinc polcarboxylate 40Mpa
Polyalkelonate: 130Mpa,m80% of strength within 1 hour and tensile of 12Mpa

Restorative (45 decks)

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