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Flashcards in bases and liners Deck (45)
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1

initial stage in cavity design

outline form and initial depth
resistance form
retention form
convenience form

2

final stage of cavity design

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

3

intial depth of preps

.2mm-.8mm pulpally
from the DEJ usually .5mm

4

function of the dentin/pulp complex

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

5

what can the tooth feel

pain

6

hydrodynamic theory

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

7

types of pulp health

normal/healthy
Pulpitis (reversible and irreversible)
Necrotic pulp

8

what to do to diagnose pulp status

patient symptoms
radiograph
clinical tests

9

characteristics of tooth pain

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

10

what is done in an emergency exam

patient info about problem is gathered
examination
radiographs
diagnostics
final diagnosis

11

clincial methods to test pulp

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

12

why use a liner or a base

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

13

what is given to shallow amalgam tooth preps

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

14

what is given to moderate depth preps

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

15

what is given to deep preps

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

16

what are liners

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)

17

Types of liners

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

18

what are suspension liners

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

19

depth of minimal caries

if remaining dentin thick is greater than 2 mm

20

what is used on minimal caries

liner (copal varnish or adhesive liner)
amalgam

21

smear layer


thin later that can plug dentin tubule

22

sealing of 1 and 2 later copal varnish

1: 55% sealed
2: 85% sealed

23

roll of bases

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

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

increase final compressive strnegth

25

types of bases

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

26

descritpion of moderate caries

ideal prep does not remove all carious tissue
remaining dental tissue is .5-2.0mm

27

what to do with moderate caries prep

extend acces opening laterally until DEJ is not carious
Remove Carious dentin

28

why use a base in moderate caries

replace missing dentin
(also use a liner)

29

what type of reaction occures for bases and liners

Water based and acid-base reactions

30

mixing technquie for ZnPO4

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