denture base resin

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Dental Base Resins
Scripters’ notes: The record for this script was unclear but I tried my best to write
everything mentioned in the lecture, so I apologize in advance if I missed anything
in the lecture.
Many thanks for Elite batch’s dental material scripters, without their scripts I
wouldn’t have been able to finish it.
All slides are included.
Denture construction:
Denture construction requires a lot
of steps like taking an impression
followed by pouring the impression
in the lab, making an extension,
making another impression, teeth
setting etc.
Dental uses:
Complete dentures: for patients
who have lost all of their teeth
Partial dentures: for patients who
have lost only a certain number of
teeth (whether upper or lower teeth)
Artificial teeth that are attached to complete or partial dentures
Denture repair
Denture teeth
Soft liners: a soft material that is applied underneath the denture ex: sometimes
when dentures are placed in the patient’s mouth for the first time , the patient
may feel some pain or sourness because some part of the denture may be sharp
or irritant , so the dentist applies this soft liner to act as a cushion so when the

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patient bites or uses the denture during eating it will not be irritant to the soft
tissues
Construction of customized trays
Soft tissue replication on cast metal framework
This is how the set material looks like, so it is similar to the color of the gingiva
(pink in color) it is supplied as:
1- as a dough material
2- as powder and liquid (have to be mixed)
Composition:
they all have the same components in general , the slight differences in
composition is the reason why some materials are cold cured and others are heat
cured or light cured , and therefore manipulation will be slightly different
between them
Multiple types of acrylic resins are available.
Heat cured: need temperature to start the reaction and eventually set
Cold cures: set at room temperature as soon as the components are mixed, the
reaction starts and in a certain time the material will set and become hard
Light cured: they need to be subjected to a certain wavelength of light from a
machine to set and become hard
Pour and cure resins: poured into moulds to make dentures.
Injection moulding: injected into moulds to make dentures.
The last two are not commonly used because:
1- they are highly flowable and that makes them weak (main cause)
2- their reaction will not be 100% finished and that will leave uncured
components which can cause irritation to patients

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Requirements of denture base polymers
To function properly as a denture, as a tray, as an artificial tooth
1- Physical properties:
Appearance: because it’s replacing teeth and surrounding structures it needs to
have a good esthetic appearance.
Glass transition temperature: it refers to the temperature at which the material
starts to become soft and flexible OR the temperature at which the material is
transferred gradually from being hard to soft Ex: if the patient washes the
denture in boiling water, this high temperature will soften the material and cause
it to dissolve
Note: the material needs to have ability to resist distortion
Dimensional stability: the material shouldn’t change in dimension; otherwise it
will not fit in the patient’s mouth.
Specific gravity value: it needs to have low specific gravity value, so it should not
be too heavy.
Example: if an upper denture is heavy, by gravity it might fall and retention will
be very difficult inside the patient’s mouth, as soon as we start speaking or eating,
it will easily
Thermal conductivity: the property of a material to conduct heat
If the patient is wearing a denture which has low thermal conductivity (good
insulator), when he drinks something hot, he will not feel the hot temperature in
the soft palate or gingiva but when it reaches his throat, the high temperature is
going to burn his tissues. In the beginning, the denture prevented him from
feeling the high temperature, so he needs to start feeling the high temperature at
the anterior part of the oral cavity
Remember: the complete dentures cover everything, the entire area back to the
beginning of the soft palate.

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Conclusion: low thermal conductivity is essential to prevent burning in the soft
tissues when eating or drinking hot food and drinks.
Radiopacity: it means that when we take a radiograph, the material appears in
white color so we can see it.
Importance: if a very small part of the denture was broken (partial denture for
one tooth) or accidentally swollen by the patient
→ If it falls into the esophagus and stomach , it’s not that dangerous because it
will come out eventually but if it went into the lungs , it is a dangerous issue so
we have to take an x-Ray to see where the denture has fallen and if the material is
not radiopaque, I can’t see it on the radiograph
Conclusion: having a good radiopacity is good in such incidents.
2- Mechanical properties:
Elastic limit
Flexural strength
Fatigue life and fatigue limit: common proper in dentures, they will be fixed and
subjected to forces in multiple directions inside the oral cavity, and dentures may
be broken due to fatigue.
Impact strength: one of the main complaints of patients when they come back to
the clinic after giving them their complete dentures is the fact that when they are
cleaning it, they may drop it by mistake and it will be broken because it has low
impact strength and because in case it falls, it will fall in the water and it will not
hit a hard surface so it will not break.
Abrasion resistance
→As a dentist, you always advice the patients not to use an abrasive material
when cleaning the denture, and some of them do. So the surface of the denture
material needs to have good abrasion resistance to prevent damage and roughing
of the surface
● If the surface of the denture becomes rough while it’s in contact with soft
tissues like buccal or labial mucosa, it will cause irritation and the patient can’t
wear it.

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3- Chemical properties:
Inert: it should not react actively with components all around Remember: the oral
cavity is an active environment (saliva, varying pH etc)
Insoluble: they shouldn’t be soluble inside the oral cavity. *if it has high solubility,
it will become weak
Low absorption: it should not absorb high quantities of fluids all around it
because it will expand and its dimension will change so it will become weak.
4- Biological properties:
Toxicity and irritation before and after mixing: it should not be toxic or irritant.
5- Biological properties:
1- Cost of material and processing
2- Repair should be easy
3- Long shelf life
Heat cured resins (consists of liquid & Powder):
1- As a powder:
Beads or granules of PMMA (PolyMethyl MethAcrylate)
Initiator: benzoyl peroxide: a component which will initiate the setting reaction.
Pigments: organic dyes, e.g.: ferric oxide, cadmium sulfide.
Opacifiers: titanium/zinc oxide. Also, barium or radiopaque glass fillers (up to
20%) which may decrease strength and change appearance. → used to make it
radiopaque → if the material becomes too radiopaque, it will not be esthetically
appealing, the color of the denture will not be normal , so opacifires quantities
should be balanced

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Plasticiser: dibutyl phthalate: help manipulate the material after mixing it
Synthetic fibers: nylon/acrylic →in the soft tissues there are very small blood
vessels, these fibers are present to mimic the appearance of blood vessels that
are found in soft tissues →mainly used for esthetic purposes.
2- As a liquid:
Liquid: clear, colorless, high vapor pressure at room temperature so you can smell
it, it has a strong odor.
Methyl methacrylate monomer, boiling point of 100.3°C.
● Why is that important? → usually when heat cured, acrylic resin is used and
placed in hot water to raise the material in order for the material to set, we
should not raise the temperature above 100 °C, otherwise this monomer will
evaporate and make voids in the denture and cause it to become weak
Crosslinking agent: ethylene glycoldimethacrylate, a material important to add
strength
Inhibitor: hydroquinone, it will inhibit the reaction between crosslinking agents
and the monomers → we don’t want any reaction to happen before the mixing of
the powder and liquid and that’s what the inhibitors do.
Store in a dark container to prevent occurrence of free radicals, otherwise it will
evaporate and become too viscous.
The material of choice:
Acrylic resin (polymethyl methacrylate):
Desirable qualities:
1- Good esthetics
2- Cheap
3- Easy to process

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Disadvantages:
1- Not strong enough: especially impact strength.
2- Susceptible to distortion: especially if they are not processed correctly and
also if they aren’t used correctly by the patient.
3- Low thermal conductivity
4- Radiolucent: we can’t see them in x-rays.
Polymerization and cross-linking of acrylic resins:
Polymer: large long-chain molecules formed by chemically joining together
smaller molecules called monomers
Co-polymer: is formed when two or more different types of monomers join
together. It is a term that is used to tell you that you have more than one type of
monomer in your material.
Cross-linked polymers: the joining of adjacent long-chain polymers by bonding of
short chains along their sides
→ When side chains of adjacent polymers are joined by weak bonds, the
polymers are easily manipulated, bent, or stretched → When side chains of
adjacent polymers are highly charged, the bond is stronger, and the cross-
linked polymers are stronger and stiffer.
Polymerization reactions:
There are two types of polymerization: addition and condensation
Addition polymerization:
It is the most common form of polymerization for dental materials
It occurs in four stages: activation, initiation (or reduction), propagation, and
termination.
Polymerization:
A. Addition polymerization:
1- Activation: by producing free radicals activators:
● it depends on the type of the material:
1. Tertiary amine : if it’s cold cured
2. Heat : if it’s heat cured

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2- Initiation: when an initiator such as benzoyl peroxide is decomposed and free
radicals are produced.
3- Propagation: occurs when free radicals break the bond between carbon atoms
in monomer and adjacent monomers bond together.
4- Termination: occurs when monomer units are used up, or free radical is tied up
by a reaction.
B. Condensation polymerization: Usually more than one type of
monomer is used. The reaction produces by-products such as water,
hydrogen or alcohol.
● doesn’t occur in acrylic resin material.
Acrylic resins polymerization reaction:
The reaction is an addition polymerization reaction to convert MMA (methyl
methacrylate) to PMMA (polymethyl methacrylate).
Explanation: as soon as activation occurs, benzoyl peroxide will start to break
down and it will release highly active components, called free radicals which can
cause oxidation
So we need these highly active components so it can start joining the monomers
together to make a polymer.
The reaction continues, more polymerization occurs, and the reaction stops:
1- When there are no free radicals left
2- or when all the monomers have been polymerized (termination)
Mixing and curing of heat-cure resin:
Powder: liquid ratio affects the workability of the mix and dimensional stability
(3:1)
Liquid is poured into a container then powder is added gradually.
Too little monomer → the mix will be dry and this will lead to porosity in the final
denture due to voids and bubble incorporation during mixing and that’s what is
called a granular porosity.
Too much monomer → the mix will be runny and excess amounts of residual
monomers will be left uncured and that will lead to irritation

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Granular porosity → associated with too little monomer in the mix
→ leads to weakening in the final denture.
●usually when the correct ratio between powder and liquid is reached, the
technician covers the mixing bowl and waits for a while until he actually can take
the material and manipulate it.
● If he doesn’t cover the bowl that contains the mix, the monomers will
evaporate and if it evaporates, the mix will result in granular porosity.
Granular porosity can result from two things:
1- either evaporation of the monomer due to the fact that the technician
didn’t cover the mixing bowel
2- or the amount of the monomer incorporated with the powder is too little
from the beginning
MMA monomer:
1- Volatile
2- Flammable
Precautions:
1- Kept in a sealed container
2- Dark container away from light source or heat source
3- No contact should be allowed with the polymer beads (carry benzoyl
peroxide initiator)
Setting stages:
After mixing, we can’t immediately take the mix, manipulate it and place it in the
flask because the setting goes through stages:
Sandy stage:
The first stage seen when the powder “polymer” and liquid “monomer” are mixed
together and the mixture looks like sand and you can’t manipulate it.
Sticky or stringy stage:
It can’t be manipulated.

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Dough stage: happens in less than 40 minutes
The material is cohesive “not sticky” and it can be manipulated and shaped.
Dough stage period is the:
1- working time: time to pack acrylic resins in the moulds.
2- doughing time: time taken to reach the doughing stage.
Rubbery stage:
If I wait too long before manipulating the mix in the dough stage, it’s going to
become rubbery, if I try to shape it or stretch it, it will go to its original shape (it
will be elastic)
Stiff stage: (the final stage)
It’s not completely set, but it’s too stiff and too rigid to be manipulated
Importance of pressure applied when flasking.
The mix should be loaded in the flask or mould during the dough stage to make
the denture.
Then the flask is closed and pressure is applied so that the material is evenly
spread all over.
If the material was in the sandy stage or sticky stage, it is too runny and you will
not be able to apply pressure on it.
Note: whenever we are using these materials, an excess amount of material is
used because during processing and due to the setting reaction, there will be some
polymerization shrinkage, so we always need to place extra dough
(to compensate shrinkage)
Flasking and Heat curing:
Curing, important considerations:
Benzoyl peroxide decomposes at 65 degrees (Exothermic reaction)

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Danger of gaseous porosity. How to avoid?
Curing should be to high degree to prevent residua monomer. Why?
Long cycle: 8 hours or longer in 74°C water
Short cycle: heat at 74°C for 1.5 hours then boil for an additional hour.
Suggested cycles for curing in your text book:
1- 7 hours at 70°C then 3 hours at 100 °C
2- Bring to a boil within 1 hour the boil for 1 hour
There are many suggested cycles but the idea is that you need a high
temperature up to 100 °C in order to allow all the monomers to be converted to
polymers so that few or no monomers are left behind “to avoid irritation”
After we finish processing, cooling is needed cooling needs to be very slow so you
should not place it in cold water or put it in the fridge, we usually leave it on the
bench and allow it to cool down gradually. By this, distortion in the denture will
be prevented
If it was cooled quickly, this will create stress inside the material and it will be
distorted and it may not fit in the patient’s mouth.
1- We start with this model which has the
wax denture.
Remember: we start with wax and transfer
it to the final material “acrylic”.
2- We place the model or cast in this flask
“mould” and all around is plaster.
3- It is closed and packed in hot water.
4- The wax will be melted away.
5- We open the flask again and use the
mixed acrylic dough and place it where the
wax used to be.
6- Close up again and put it in the long or short cycle, then it will be set.

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Processing strains:
a. Internal strains occur during processing of resin.
b. If allowed to relax, warpage, distortion and crazing (tiny surface
defects) occur.
c. Some are relieved as the material flows but thermal contraction
strains may remain. This can be minimized by:
i. Slowly cooling flask:
Sometimes if there is a stress created within the material due to manipulation , it
can lead to defects on the surface of the denture which will lead to weakening of
the denture , so again cooling has to be slow
ii. Using acrylic rather than porcelain teeth to ensure compatible shrinking:
Another factor that is important to prevent stress is the type of teeth that we use
in these dentures
There are two types of artificial teeth:
1- Acrylic resin teeth: similar material to the denture material
2- Teeth that are made from porcelain: porcelain is more esthetic , more
biocompatible , looks more natural , but it’s from a different material than acryl.
If I use porcelain in teeth, and the denture base material is acrylic , as soon as
processing starts and high temperature is applied ,these two materials will
expand and then contract at a different range which might cause de-bonding
between them and will also create stress in the denture base
Because: these two components have different coefficients of thermal expansion
That’s why it’s recommended to use the acrylic teeth on the acrylic denture
because: they both expand and contract at a similar range, so there will be no de-
bonding or stress created.
This minimizes the stress or strain within the denture base material during
processing and also decreases the chance of de-bonding and those teeth won’t
become loose in the acrylic base material compared to porcelain teeth.

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Cold cure resin:
Composition: identical to heat cure
resin except polymerization is
initiated by tertiary amine (e.g.
sulfinic acid or dimethyl-p-toluidine)
which is an acceleratoractivator.
Note: you don’t have to memorize the name, just know it’s a tertiary amine so as
soon as you mix the liquid with the powder, the tertiary amine will activate benzyl
peroxide and the reaction will start
and free radicals will be released.
Working time is less than heat cured
acrylic, and viscosity rapidly increases.
Explanation: because polymerization
immediately starts, so we need to be
quick using this material.
Usually it isn’t used to make dentures
because:
1- it’s weaker than heat cured materials
2-working time is less, so you don’t have enough time to manipulate it properly.
3-there is no heat used to induce polymerization and that may leave residual
monomers uncured and that can cause irritation to the patient.
Cold vs. heat cure:
Smaller polymer beads are used in cold cure resin to ease dissolution in
monomer.
Cold curing method results in a polymer with a lower molecular weight leading to:
1- Lower strength
2- Residual uncured monomer, so, higher solubility
3- Lower color stability, more prone to yellowing (may become yellowish in
color after sometime)
Cold Cure Resins
Cold cure resins used for making special trays

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Manipulation, processing of cold cure resin:
Allowed to cure at room temperature or in warm water. It starts to polymerize
soon after mixing (2.5 hours).
Packing consistency is reached in 5 minutes and working time is short. (Danger of
raised bite) and has lower dimensional changes due to less residual stress.
Pour and cure resin (pourable):
Same composition, smaller bead size. Mixed and poured into a mould of
hydrocolloid. Excellent reproduction of details but inferior in other aspects
(strength, residual MMA, distortion)
Uses:
1- In Custom made trays
2- In repairing broken dentures: when
they use it for denture repair, they
put it in a pressure pot, but it can
also set in room temperature.
3- rarely used to make partial or
complete dentures because:
A. They are highly flowable (more
liquid): and because of that there
is a higher chance to have MMA
monomer remaining, and that
will cause irritation to the
patient.
B. They are not very strong
C. they can be distorted easily
Fluid Resins

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Light cure resin (blue light):
Used as denture hard relining
material, repair material,
construction of trays.
Composition:
1- UDMA
2- Colloidal silica to control flow
3- Photoinitiator
4- Activator
Since its light cured, it has to have
a special component that is
sensitive to light and that’s what is
called a photoinitiator.
Camphoquinone: is the most common photoinitiator.
→ so as soon as you subject it to a certain wavelength of light from a unit
called a light curing unit, it will start to set and become hard within a short
period of time
There is no need for temperature or mixing and it is only one component like
a sheet that is slightly flexible.
It can be adapted on the model or cast; we cut the excess and light cure it.
Injection moulding: (the material has high
flowability)
Acrylic is forced into a mould
Sprue hole, vent hole
Curing is occurring furthest from the holes. What is the benefit?
Materials used:
1- Cakes
2- Premixed
Light Cured Resins

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Disadvantages: (due to its disadvantages, it is not commonly used)
1- low strength
2- residual monomers
3- needs special equipment
Structure of the set materials:
Complex:
Mechanical properties are affected by how strong the bond is between the 2
phases.
When mixing powder and liquid:
PMMA beads are readily soluble in
MMA, why?
Degree of interpenetrating
network formed depends on:
Larger beads are more difficult to
be penetrated by monomer
Notes about the previous figure:
What happens when the material
starts to set?
Not all the particles become polymerized and reactend, some of them remain
unpolymerized and they are surrounded by a matrix of the reacted material
In every material “mostly”, when you mix the two components together, not
every single part of the material becomes reactend, we will have a matrix of
reacted particles and within the matrix, unreacted particles may be found.
Usually, the beads in the powder are large, so as soon as you mix them with the
monomer, it can’t penetrate the particle completely, but in cold cured materials,
the particles are very small and they are easily penetrated by the monomer and
easily dissolved.
Unreacted PMMA
Unreacted PMMAUnreacted PMMA
Matrix

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Note: the mechanical properties will be affected by how strong the two
components are attached together (the matrix and unreacted components)
Properties of resin:
Biocompatibility:
High, however, allergy may occur due to leachable components, mainly the
monomer and benzoic acid. (Some patients may show allergy from the monomer)
Allergy is mainly associated with cold cure resin due to high residual monomer
after setting (soln:terminal boil for 2-3 hrs) , so there are alternatives to be used if
the patient is allergic.
As a replacement, denture bases maybe constructed from polycarbonate, vinyl
acrylics, light activated acrylic and the pigments maybe toxic (it can be slightly
toxic to the patient).
How to know if the patient is allergic?
As soon as he wears the denture, he will feel pain, sensitivity, irritation, or redness
in the mucosa.
Mechanical properties:
Soft, weak, flexible, unless denture constructed in proper thickness (but not too
thick, why?)
Creep is a problem, minimized by crosslinking agents, more common in heat-
cured resin and dentures are prone to fracture due to poor impact strength.
Poor resistance to fatigue (fatigue may result from wearing ill-fitting dentures)
Design of denture includes notch design to accommodate frenum, resin material
are notch sensitive.
It can also be distorted if the patient doesn’t use the proper way to clean them
(like soaking the denture in boiling water)

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So all of this depends on how accurate the dentist gives the patient the
instructions.
It does suffer from some disadvantages:
1- You might be tempted to make it thicker, but thickening the denture material
will be uncomfortable to the patient.
2- if you take a look inside the oral cavity, you will notice that there are structures
like muscle attachments, frenum (lingual,buccal,labial frenum), so when we make
a denture for the patient, we need to make some space for these structures,
otherwise, as soon as the patient starts to speak or move his muscles, it’s going to
interfere with the denture and the denture may fall down, or the frenum and
muscle attachments will be injured.
That’s why we make spaces in the denture for muscle and frenum attachments,
these areas look like a notch in the denture, and this notch may be a weak site , it
may cause weakening of the denture.
Crazes, surface cracks may result from:
1- Dentures drying out (absorption and loss of water cycle)
If the patient takes the denture out, he has to place it in a moist environment
because if it dries out it will be distorted (we need to tell the patient how to store
and maintain the denture).
2- Using porcelain teeth
During denture repair when monomer contacts cured acrylic resin.
Modified acrylic materials
Manufacturers try to modify the components of the denture to improve the
impact strength to minimize fracture if the patient drops the denture accidently
and the solutions are:
Solution to patients who commonly fracture dentures (area of active research):

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 High impact resistant resin (contain rubber toughening agent)(Greater
cost)
 Incorporation of fibers to produce fiber reinforced resin:
1- Carbon fibers: difficult to handle, poor esthetics, need surface treatment
“they are not used commonly”
2- Aramid fibers: fine filaments, readily wetted by MMA, no special surface
treatment. (Commercially: Kevlar)
 good option because they bond very well to acrylic resin material
3- Glass fibers: incorporated as short fibers or loose form, need care
regarding surface treatment and fiber orientation.
 good option because they can lead to high strength and they are highly
esthetic
 Opacity: incorporating bromine additives
Physical Properties:
Thermal conductivity: Low: isolates tissue from temperature
sensation , inclusion of sapphire whiskers
increases conductivity
Coefficient of thermal
expansion:
High , affects fit of denture
Heat distortion temperature (Tg
105 C for heat cure , 90 C cold
cure):
Resins deform above their glass transition
temperature , distortion temperature
Water sorption and solubility: Absorb water 1-2% wt slowly .insoluble in
oral fluids .soluble in ketones , esters,
alcohol causes crazing
Specific gravity: Low , so better retention

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Chemical properties:
Candida albicans may colonize denture surface and can be prevented by proper
cleaning.
Denture whitening, denture looks bleached. Maybe caused by a combination of:
1- Using hot water to soak the denture (common reason)
2- Contact with solvents such as acetone
3- Improper networking between polymer beads and matrix phase
Denture Stomatitis:
It is an inflammation that has the same shape
of the denture on the palate, residual ridge,
buccal and labial areas.
It affects the areas underneath the denture
and it is mainly caused by candida albicans,
common in elderly people.
Remember: we all have candida albicans
normally inside our bodies but because we
have normal flora and good immunity, it
doesn’t affect us.
As soon as normal flora is disrupted and the immunity is lowered, in other words
“as we get older”, candida albicans can be active
and lead to denture stomatitis.
Another problem is denture bleaching
(whitening)
Caused by combination of factors:
1- using hot water
2-Acetone
3- Using acrylic material with poor network
between matrix and beads (mismatch in
refractive index)

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Alternative polymers (if the patient is allergic):
1- Polycarbonate: processed by injection moulding (processed at high
temperatures)
2- Vinyl polymers (low Tg temperature)
Problems (disadvantages):
● too flexible or too soft (easily distorted)
Moving on to artificial teeth; two types are available. They can either be made
from porcelain (dental ceramic) or from acrylic dental material. In general,
certain requirements are favorable in artificial teeth. These include (Specification
No. 15)*:
 Good appearance
 Good bonding with denture base
 Resistance to abrasion, distortion and crazing
 Strength and toughness
 Biocompatible
 Allow adjustment when checking occlusion
Specification No. 15: Refers to certain standards that are issued by organizations
like the ADA and ISO whom are responsible for setting standards for different
materials.
Acrylic teeth:
 Produced in reusable molds using
injection or the dough technique
and they can be available in
several shapes.
 Made from rigid, highly cross-
linked resin to resist crazing.
 Pigments are added to replicate
natural teeth colors.
 Base and core of teeth are made
from lightly cross-linked resin (but
middle and incisor teeth are
made from rigid highly cross
linked) to allow softening and
sticking to the denture (Chemical
attachment).
Porcelain teeth:
 Larger than required molds are
used to allow shrinkage during
fitting: Since porcelain shrinks as
soon as it sets; the molds need to
be slightly larger than the actual
size of the tooth.
 Small pins are added to the base
of the tooth for retention to the
denture base (Mechanical
attachment).

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Properties:
Instructions to patients on denture care:
 Liquid soap, mild hand soap, nonabrasive denture cleanser should be used
and denture and teeth should be cleaned with a brush
 Brushed or rinsed after each meal and before soaking in denture soak
 Denture tablets that available in pharmacies can be used to make a denture
soak to remove debris and saved dentures from fungal and bacterial
growth.
 Calculus deposits can be softened by soaking denture in white vinegar
diluted with water 1:1 and dentures should store in a moist environment
 Dentures should be soaked overnight in commercial or homemade soaks
 Undiluted bleach should be avoided since it fades color and corrode metal
parts of partial dentures
 Tissue bearing surface should be cleaned with soft brushes to avoid
abrasion
Best Regards
Hummam Rihawi
Acrylic teeth:
 Chemical bond to denture base
material
 Easy to grind during occlusal
adjustment
 Do not wear natural, artificial
opposing teeth
 Easily repolished
 Compatible with denture base
material (CTE)
 Stain over time
 Easily wore
Porcelain teeth:
 Better esthetics
 Biocompatible
 Mechanical retention to denture
base
 Difficult to adjust because they
have a hard surface
 Produce clicking sound when
hitting opposing teeth
 Wear opposing natural teeth
 Transmit greater forces to
supporting tissue
 Heavy
 More expensive