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amalgam > bases and liners > Flashcards

bases and liners Flashcards

1
Q

initial stage in cavity design

A

outline form and initial depth
resistance form
retention form
convenience form

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2
Q

final stage of cavity design

A 
remove any remaining enamel pits or fissures, infected dentin, or old rstoration
pulp protection
secondary retention and resitsance
finish enamel walls
clean, inspect, condition
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3
Q

intial depth of preps

A

.2mm-.8mm pulpally

from the DEJ usually .5mm

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4
Q

function of the dentin/pulp complex

A

formative (primary and secondary dentin)
defensive (reparative dentin)
nutritive (supplies vital cells
Sensory (protective

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5
Q

what can the tooth feel

A

pain

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6
Q

hydrodynamic theory

A 
micro movemnt of tubule fluids in response to:
osmolarity change
thermal change
desiccation
pressure change
high speed cutting
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7
Q

types of pulp health

A

normal/healthy
Pulpitis (reversible and irreversible)
Necrotic pulp

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8
Q

what to do to diagnose pulp status

A

patient symptoms
radiograph
clinical tests

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9
Q

characteristics of tooth pain

A 
location
intensity (pulp pain is sharp)
cause of onset
duration (does it linger)
does it hurt to bite
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10
Q

what is done in an emergency exam

A 
patient info about problem is gathered
examination
radiographs
diagnostics
final diagnosis
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11
Q

clincial methods to test pulp

A 
cold/hot (is it present and for how long)
electric Pulp test (EPT)- pain/no pain giving a value 1-80
percussion test (perioligmanet)- pain or no pain
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12
Q

why use a liner or a base

A

protect pulp and minimize post op sensitivity
act as themral and chem barrier
electrical barrier
mechanical barrier
controls inflammation of the pulp
controls fluid movement
(restorative material do not agree with the pulp

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13
Q

what is given to shallow amalgam tooth preps

A

Varnsish/sealer applied to the walls of the prep before amalgam

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14
Q

what is given to moderate depth preps

A

liners(ZOE or CaOH) for thermal protection and pulp mediation
varnish and amalgam on top

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15
Q

what is given to deep preps

A

light cured CaOH is placed in the deepest region which dentin was removed.
base of glass ionomer is used
amalgam with varnish on top

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16
Q

what are liners

A

thin layers of material used to protect dentin from residual ractants diffusing out of restoration or oral fluids that may penetration leaky tooth restorations interfaces
aid with electrical insultion, thermal protection, pulpal treatment (sometimes)

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17
Q

Types of liners

A

solution (2-5 micrometers): copal varnish, adhesives
Suspension liners (20=25 micrometers): CaOH2
Cement liners (200-1000micrometers): GI
Eugenol liners: ZOE and B & T
dentin bonding systems/sealers:optibond solo plus/gluma

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18
Q

what are suspension liners

A

any liner based on water and have consituents suspended and not dissolved

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19
Q

depth of minimal caries

A

if remaining dentin thick is greater than 2 mm

20
Q

what is used on minimal caries

A

liner (copal varnish or adhesive liner)

amalgam

21
Q

smear layer

A

thin later that can plug dentin tubule

22
Q

sealing of 1 and 2 later copal varnish

A

1: 55% sealed
2: 85% sealed

23
Q

roll of bases

A

provide themal protection for the pulp
supplement mech support for the restoration by distributing local stressed from the restoration across the underlying dentinal surface

24
Q

why do dental cements for bases mix at high powder;liquid rations

A

increase final compressive strnegth

25
Q

types of bases

A 
ZnPO4 cement
ZOE resin reinforced cement
polycarboxylate cement
Glass Ionomer Cement (most common)
RMGI (most common)
26
Q

descritpion of moderate caries

A

ideal prep does not remove all carious tissue

remaining dental tissue is .5-2.0mm

27
Q

what to do with moderate caries prep

A

extend acces opening laterally until DEJ is not carious

Remove Carious dentin

28
Q

why use a base in moderate caries

A

replace missing dentin

also use a liner

29
Q

what type of reaction occures for bases and liners

A

Water based and acid-base reactions

30
Q

mixing technquie for ZnPO4

A

4-5 drops of liquid plus powder
devid powder into increments
mix on cool slab (absorb heat of reaction, and can mix more powder now
avoid moisture (decreases setting time)
mix over large area ( slows setting)
incorporate increments every 15 seconds until mixture can be picked up into a ball without sticking

31
Q

mixing technique for CaOH liner

A

equal portions and apply to clean, dry cavity preparation

32
Q

mixing Zn oxide eugenol liners

A

paste-paste: equal portions

Paste-liquid: 2-3 drops of liquid per scoop of powder

33
Q

why use GI over ZNPO4

A 
adheres to tooth (mineral and dynamic ionic)
release fluoride
clinical record of retention
dimensionally stable
biocompatible
34
Q

why condition dentin

A

clear smear layer but leaves smear plugs

35
Q

GI reaction

A

acid matrix dissolves periphery of glass
Glass releases ions (Ca. Al, F)
divalent Ca ions quickly chelate with acid polymer chains
after 24-72 hours (al replaces Ca
increases strength
F release
Acid side groups chelate with glass and HA

36
Q

what is extensive caries

A

close to pulp (less than .5mm RDT)

exposed pulp

37
Q

when to use a direct or indirect pulp cap

A

near expose: indirect

exposed cap: direct

38
Q

timeline of defensive (reparative dentin

A

15 days : cells differentiate
30 days” microscopic repatative dentin
100 days: radiographic reparative dentin

39
Q

reaction of CaOH liner

A

acid base reaction where Ca+ ions act to crosslink polyphenol groups

40
Q

roll of CaOH liners

A

Insulator, Stimulates reparative dentin

41
Q

how CaOH works

A 
release OH (High pH)
when ionized in low concetration, stimulates odontoblast formation
42
Q

when is sedative restoration done

A

with questionable pulp status or emergency treatment with limited time

43
Q

what is used in seadtive restorations

A

Intermeidate restorative materials and bases and tempors

USes reinforced ZOE

44
Q

how reinforced ZOE works

A

oils of clove acts as obtudent (dull pain

expands when set to seal

45
Q

when can ZOE not be used

A

under composite because it inhibits polymerization

amalgam (5 decks)

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