dental cements ch 44-45 Flashcards
dental (cavity) liners do what
lines, seals, protects, regenerates
material placed in a thin layer on the walls and floors of the cavity prep. It protects the pulp from bacteria and irritants
liners
uses and characteristics of calcium hydroxide (dycal)
pulp protector, used when pulp exposure expected.
very soluble
commonly used dental liner
dycal (calcium hydroxide)
when do you use dycal
protects pulp from chemical irradiation by sealing it.
Stimulates production of reparative or secondary dentin
advantages of liners
biocompatibility and its ability to stimulate reparative dentin
disadvantage of liners
has low compressive strength.
Very soluble
where is the liner placed
on the deepest dentin surface of the preparation . NOT to be placed on the enamel or in a groove
indication for use - what varnish does
seal dentinal tubules.
reduce micro leakage around a restoration.
Act as a barrier to protect tooth from highly acidic cements
when to apply varnish and where
applied after the liner and or insulating base .
Thin coat on the walls, floors and margin of cavity preparation .
Apply second coat
what is varnish applied with
a cotton pellet and sterile cotton pellet forceps or applicator brush
what prevents or treats hypersensitivity
desensitizer aka primer
seals the dentinal tubules to prevent oral fluids from seeping in between the tooth and restoration , which can cause sensitivity
desensitizer aka primer
desensitizer application process
apply the dentin sealer with cotton tripped applicator.
Apply over all areas of the exposed dentin
dental bases provide pulpal protection to which 3 bases
protective base, insulating base, sedative base
protect pulp before restoration is placed . Reduces postoperative sensitivity and damage to pulp
protective base
placed in deep preparations to protect the tooth from thermal shock
insulating base
sedative base
soothe pulp that has been damaged by decay or irritated during process of removing decay
luting agents
bonding or cementing together (glue). Could be permanent or temporary
IRM
intermediate restorative material
permanent cements
long term cementing agent
temporary cements
short term cementing agent ( when dentist needs to remove the restoration at a later time)
t/f; cement should be mixed so that it appears similar to syrup and mix should string up and break about 1inch from the slab
TRUE
base/temporary restoration consistency
thick, putty like.
Slightly tacky but able to be rolled into a ball (like play dough)
contains oil from cloves, which has a soothing effect on the pulp , some patients may be allergic
zinc-oxide eugenol (ZOE)
not as strong and is used for temporary restorations and cementation;
ZOE type I
has been reinforced and is stronger, and can be used for permanent cementation.
ZOE type II
used for short term restorations, sedative dressing, or insulting/sedative base
ZOE type III
ZOE liquid/powder
mixed on oil-resistant paper pad.
Mixing time 30-60 secs.
Setting time in mouth 3-5 mins
ZOE paste
supplied as two paste system as temporary cement .
Oil-resistant paper pad and mixed
reduces sensitivity to tooth.
Maintains function and edthetics to tooth until permanent restoration .
Prevents shifting of adjacent tooth .
Lasts 6 months
intermediate restoration
zinc phosphate Type I (fine grain)
used for permanent cementation of cast restoration like crowns, inlays, bridges.
Creates thin film layer
Zinc phosphate Type II (medium grain)
use as insulating base for deep cavity preparation
not as strong as zinc phosphate, but less irritating to pulp.
polycarboxylate cement
permanent cement for cast restorations, stainless steel frowns, and orthodontic bands.
Non-irritating liner under both composite or amalgam restorations.
use of polycarboxylate
purpose of a dental liner is to
protect the pulp from any irritation
what tooth structure is calcium hydroxide placed in the prepared tooth
dentin
the key ingredient in varnish is
resin
another name for dentin sealer is
desensitizer
what does a cavity sealer seal
dentin tubules
an insulating base is placed to
protect the pulp from thermal shock
what effect does eugenol have on the pulp
soothing
what dental instrument is selected to press a base into the cavity prep
condenser
purpose of dental bonding material is to
bond restorative material to the tooth structure
what is removed from the tooth structure before a bonding material is placed
smear layer
which sequence is recommended for the application of supplementary materials for a deep restoration
liner, base, dentin sealer, bonding system
