Cavity Lining Materials Flashcards

1
Q

lining materials are

A

a protective barrier, prevents gaps between tooth and filling

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2
Q

cavity base

A

thick mix, used to minimise bulk of material or block out undercuts [metal restorations]

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3
Q

cavity lining

A

placed voer dentine, protects and promotes pulpal health

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4
Q

cavity LM provide pulpal protection from

A

chemical stimulin
thermal stimuli
bacteria and endotoxins [microleakage]

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5
Q

CLM have therapeutic and palliative effects;

A

calms down inflammaiton and promotes pulpal healing
reduces px symptoms

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6
Q

properties of CLM

A

ease of use, thermal conductivity low, thermal expansion coefficient matching tooth, thermal diffusity matching tooth, high compressive strength, radiopaque, cariostatic

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7
Q

thermal expansion coefficient

A

change in length per unit length for a temperature rise of 1*C

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8
Q

types of material used as CLM

A

calcium hydroxide [liner]
zinc oxide cements [base]
GIC/RMGIC [liner]

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9
Q

CaOH liner

A

CaOH, zinc oxide filler, plasticiser
butylene glycol disalicyte catalyst
pH12 in reaction

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10
Q

CaOH MOA

A

irritates odontoblast layer, forms reparative dentine, calcium from pulp helps form a bridge in pulp/dentine, high alkaline content in bactericidal
used when cavity approaches pulp, covered with RMGIC

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11
Q

CaOH properties

A

quick setting time, radiopaque, easy to use
BUT
low compressive strength, unstable, soluble

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12
Q

ZnO as cavity base

A

zinc oxide eugenol (ZOE), root canal sealer, PD dressings
not used under composite resin, will not set

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13
Q

ZnO properties

A

adequate working time, rapid setting, low thermal conductivity
bUT
low strength 20MPa, weak hydrogen bond, high solubility

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14
Q

resin modified ZOE

A

adds resin to mixture, reduces solubility, increases compressiver strength to >40MPa, making suitable liner

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15
Q

GIC as lining material

A

only liner able to bond to restorative materials, bond and seal dentine, bond to composite over

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16
Q

GIC liner properties

A

ease of use, long working time, high compressive strength, low thermal conductivity, fluroide releasing
marginal seal amazing, seals dentinal tubules so decreases microleakage, prevent sensitivity
may need etch
RMGIC no surface tx, bond amalgam to tooth