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This content explains the dental procedures of relining and rebasing complete dentures, detailing their indications, contraindications, and step-by-step clinical and laboratory processes.
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foreign [Music]
Ing and re-pacing of complete Danger
many students had requested for this
topic you know this topic comes as a
short note in the theory exam it is
often asked in the grand fiber and many
mcqs are framed from this topic we will
be discussing step by step the clinical
as well as the laboratory procedure of
relining and rebasing so stay tuned till end
first of all what is re-learning you
know after a few years when the redress
option takes place or in case of the
immediate danger patient complains of
the loose dangers okay so the procedure
used to resurface the tissue site of the
danger with a new base material that
produces an accurate adaptation of the
danger Foundation area
the second is the re-basing you know
rebasing is the laboratory procedure or
the process of replacing the entire
denture base material on an existing
prosthesis now in the relining we were
just resurfacing the tissue side but in
rebasing we will be replacing the entire
next comes the indications where we will
realign or rebase the danger now first
of all the immediate danger in immediate
dangerous at three to six months after
their construction the tissue
modification takes place and the dangers
become loose they need to be realigned
second is the poor adaptation where the
residual alveolar Rich has resolved and
the adaptation of the Denture basis to
The Ridges is poor then we go for relining
relining
now the geriatric or the chronically ill
patient you know when the construction
of new dangers with a series of
appointments it can cause physical or
mental stress to the patient and we
cannot construct new dentures
last but very important when the patient
cannot afford the cost of having the new
Dentures then also we have to opt for relining
contraindications you know the
conditions the situations where we will
have to fabricate new dangers we cannot
go for the re-landing the first is the
unsatisfactory jaw relation when the
occlusion vertical Dimension is not
satisfactory or when the uh complete
denture occlusion it does not coincide
with the Centric relation okay then
we'll have to go for the new Dentures
second is the poor Aesthetics when the
size shape shade or the arrangement of
the artificial teeth is not acceptable
it's not satisfactory
third is the abused soft tissue the oral
tissue has to be in optimum health for
relearning or the relining has to be
delayed until the tissues they recover
next comes the excessive amount of
resorption if it has taken place then
also we will go for the fabrication of
new denture
last but very important the dangers with
the major speech problem phonetics okay
that cannot be altered with relining so
we will have to fabricate new dangers in
now let us discuss the step-by-step
procedure of doing the relining and the rebasing
four steps are involved okay in the
relaying in the rebasing first is the
tissue preparation second is the danger
preparation the existing danger needs to
be modified third is the impression
making that is the clinical procedure
and last is the laboratory procedure to
get the modified denture foreign
okay first in the tissue preparation the
hypertrophic tissue needs to be
identified and it should be surgically
removed okay the dangers can be used as
a surgical splint also in these cases
second the oral mucosa it should be free
of any area of irritation you know that
has to be ruled out and that has to be
recovered before we go for the final impression
impression
third patients should be asked that
dentist should be left out of the mouth
for at least two to three days before we
make the final impression
last and very important you you can ask
the patient to do the daily massage of
the soft tissues this is helpful to
step number two is the danger
preparation okay in this first uh the
pressure areas on the tissue surface of
the danger needs to be identified we can
use pressure indicating paste for it and
these need to be relieved second is the
minor occlusial disharmonies that has to
be corrected by The Selective grinding
okay third is the Border area if the
Border area there is any inadequacy or
short then it should be extended and
corrected with the help of the green
stick compound
last and very important is the posterior
marital seal area adequate and correct
posterior palatal seal area should be
established before we go for the final impression
step number three that is the clinical
step impression making for the relining
okay in this we have three techniques
first is the static impression technique
second is the functional impression
technique and third is the chair side
technique in the static impression
Technique we further have two options
first is the open mouth impression
technique and second is the closed mouth
impression technique let us discuss them
first is the closed mouth impression
technique that is the static impression
technique it is the most common
impression or the clinical technique for
relining of complete denture in our clinics
clinics
for this the first step is the danger
preparation all large undercuts of the
danger are to be relieved second on the
tissue surface the acrylic resin needs
to be relieved by one to two millimeter
the Escape holes they are drilled
especially for the maxillary danger bases
bases
second Comes The Border molding the
borders are to be reformed by the low
fusing green stick compound the
posterior palatal seal is achieved with
a low fusing compound
third coming to the final impression if
we talk about the materials we can use
zinc oxide neutral impression paste we
can go for light body silicons or we can
go for the mouth temperature waxes
while making the impression patient is
asked to close in the existing Centric
occlusion and the intercarpition you
know this existing cro is used to
stabilize the danger or we can also go
for the bags interocclusion record which
second is the open mouth impression
technique this is less commonly used
this is just like a normal impression
technique that we make in the complete
danger in this the Dentures they are
used as the special trays for making the
New Impressions okay the existing
Centric occlusion is not used and the
new Centric relation occlusion record is
obtained after the impressions are made
okay if we compare it with a closed
mouth impression technique the closed
mouth real line technique is preferred
when the static impression method is used
after the static next is the functional
impression technique
this technique was suggested by Winkler
the material used for functional
impression technique are the tissue
conditioners or the treatment liners
they come in the powder and the liquid
form the powder and the liquid they are
mixed and they are applied on the tissue
side of the danger
before going for the impression the
patient's mandible is guided into
Centric relation to stabilize the danger
there are three physical stages of the
tissue conditioners okay that will allow
us to use them with different objectives
first is the plastic stage when the
Denture base it responds to the
functional and the parafunctional
stresses so the fit is improved okay the
tissue conditioner when they are applied
onto the Denture they are in the plastic
stage and it lasts for few hours to few days
days
is the elastic stage in this the stress
is cushioned and the tissue recovery
takes place it lasts for one to two weeks
weeks
third is the form stage okay when the
surface is similar to the polymerized
resin surface
okay and it will last for 15 days this
is the form stage when our realign
impression is ready after we have
achieved the form stage the wash
impression with zinc oxide digital
impression paste or light body material
is made
then the stone cast is poured immediately
immediately
new Centric relation occlusion record
should be considered if necessary foreign
foreign technique
it makes use of the acrylic resin the
self-cure acrylic resin or any other
plastic material that could be added to
the danger directly and allow to sit in
the mouth
okay this is not at all a recommended technique
technique
this is the limitations of this
technique is that first it can produce a
chemical burn on the mucosa due to the
monomer present in the acrylic
second the material it remains porous
and it develops a bad odor
third there is poor color stability of
once we have made the impression now we
will proceed to the lab procedure you
know the process of replacing the
impression material with the acrylic
raisin is same either for the static or
the functional impression and if we
compare the realigning versus the
rebasing the difference between the two
isn't just the amount of the old danger
base that needs to be removed and
replaced for re-pacing the entire danger
bases eliminated except for the teeth
and maybe just two millimeter adjoining
the Denture base especially when the
the different methods that can be used
to replace the impression material with
the acrylic raisinart first is the
articulator method second is The Jig
method and third is the flask method so
now first is the articulator method what
is that the impression is not separated
and the master cast is port
the first step second a layer of plaster
is added on the lower member and the
Denture is settled in the stone mix the
teeth will penetrate into that stone mix
for about two millimeter
okay and the occlusion plane should be
parallel to the floor
third the cast is then attached or
mounted to the upper member
then all the impression material is
removed okay the Denture trimming is
done now at this point we will elect
whether we are going for rebasing or
re-landing Okay so this will differ in
the amount of the trimming that we are
doing for the danger
after this the separating media will be
applied like let it be cold muscle or
tin foil then we will plan that whether
we are going for the relining with auto
polymerizing resin or heat curation if
Auto polymerizing resin then the cold
cure resin is packed in the articulator
it is allowed to sit in the pressure
container at 15 to 20 psi for 30 minutes
and for the heat cure resin the danger
will be waxed up okay it will be removed
it will be flast and then it will be
processed once we have got the danger we
will do the finishing and polishing foreign
which is used to maintain the mechanical
positional relationship between a piece
of work and a tool or we can say the
position between the components during
the assembly or the alteration just like
an articulator okay it is just an
alternative to the articulator that's it
so the procedure the lab procedure will
just be similar to that of an articulator
articulator
or we can also alternatively use hoopers
duplicated that is also a kind of Zig
only which can be used uh similar to a zinc
third is the flask method for doing the
lab procedure in this first we will be
doing the beading and boxing of the
realigned impression the mastercast is poured
poured
then what we will do the danger with the
cast is embedded in a flask
okay the flask is warmed so that the
green stick which is present in it
becomes softened before we open the flask
flask
then the flask is opened and the
impression material is removed we can
see that the two parts of the flask one
contains the master cast embedded in it
and second contains the realigned
impression with the danger
okay now after removing the impression
material the separating media will be applied
applied
then the heat cure resin it is packed in
the mold and it is processed once the
processing is done the danger will be
with this we come to the end of this
topic I'm sure now there are no more
doubts regarding this topic
please like and share the video and you
can also give your topics that you want
me to cover in the comment section I
will try to cover them in the next videos
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