Artificial teeth

Acrylic & Porcelain Teeth for Dentures, Advantages, Disadvantages, Indications, Comparason

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ARTIFICIAL TEETHARTIFICIAL TEETHARTIFICIAL TEETHARTIFICIAL TEETHPRESENTED BY
DR. HASHMAT GUL
DEMONSTRATOR, AMC,
DENTAL MATERIALS.
INTRODUCTIONINTRODUCTIONINTRODUCTIONINTRODUCTION
AConstitute one of the main components of Denture....
ACOMMONLY USED MATERIALSCOMMONLY USED MATERIALSCOMMONLY USED MATERIALSCOMMONLY USED MATERIALS
RAcrylic
RPorcelain
RComposite

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IDEAL REQUIREMENTS IDEAL REQUIREMENTS IDEAL REQUIREMENTS IDEAL REQUIREMENTS 
1). ). ). ). ESTHETICSESTHETICSESTHETICSESTHETICS
AShould ideally match the Natural teeth in shape , color & translucency.
2). 2). 2). 2). GOOD ATTACHMENT TO DENTURE BASEGOOD ATTACHMENT TO DENTURE BASEGOOD ATTACHMENT TO DENTURE BASEGOOD ATTACHMENT TO DENTURE BASE
3). 3). 3). 3). LOW DENSITYLOW DENSITYLOW DENSITYLOW DENSITY
ALight weight dentures.
4). 4). 4). 4). STRONG & TOUGH STRONG & TOUGH STRONG & TOUGH STRONG & TOUGH To resist fracture.
5). 5). 5). 5). RESIST ABRASIONRESIST ABRASIONRESIST ABRASIONRESIST ABRASION during Chewing & Cleaning.
6). 6). 6). 6). ALLOW EASY CHAIRALLOW EASY CHAIRALLOW EASY CHAIRALLOW EASY CHAIR----SIDE ADJUSTMENTSSIDE ADJUSTMENTSSIDE ADJUSTMENTSSIDE ADJUSTMENTS to adjust occlusion. ...
7). 7). 7). 7). RESIST STAININGRESIST STAININGRESIST STAININGRESIST STAINING
COMPOSITIONCOMPOSITIONCOMPOSITIONCOMPOSITION
ACRYLIC TEETHACRYLIC TEETHACRYLIC TEETHACRYLIC TEETH
POWDERPOWDERPOWDERPOWDER
RPolymer, Polymer, Polymer, Polymer, PMMA
RInitiator, Initiator, Initiator, Initiator, Benzyoyl peroxide
RPigmentsPigmentsPigmentsPigments
LIQUIDLIQUIDLIQUIDLIQUID
RMonomerMonomerMonomerMonomer, MMA
RCrossCrossCrossCross----linking agentlinking agentlinking agentlinking agent, Ethylene-glycol-dimethacrylate.
RInhibitor, Inhibitor, Inhibitor, Inhibitor, Hydroquinone.
RActivator, Activator, Activator, Activator, N N′-dimethyl-p-toluidine.
PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
RClay Clay Clay Clay (Kaolin)
RSilicaSilicaSilicaSilica
RBinderBinderBinderBinder(Feldspar)
RGlassesGlassesGlassesGlasses

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FABRICATIONFABRICATIONFABRICATIONFABRICATION
ACRYLIC TEETHACRYLIC TEETHACRYLIC TEETHACRYLIC TEETH
AReusable metal molds using
RDough Molding Technique.
RInjection Molding Technique.
AHighly cross-linked resins used to
resist crazing.
PORCELAIN PORCELAIN PORCELAIN PORCELAIN TEETHTEETHTEETHTEETH
AFabrication involves
RCompaction
RFiring
AStandard shapes & sizes produced by
using molds 30% larger than required
to allow shrinkage during firing.
ASmall holes or metal pins are
incorporated in the base of Porcelain
teeth during their production
Mechanical attachment.
ADVANTAGES OF ADVANTAGES OF ADVANTAGES OF ADVANTAGES OF 
ACRYLIC TEETHACRYLIC TEETHACRYLIC TEETHACRYLIC TEETH

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ADVANTAGES ADVANTAGES ADVANTAGES ADVANTAGES 
OF ACRYLIC OF ACRYLIC OF ACRYLIC OF ACRYLIC 
TEETHTEETHTEETHTEETH
1)Easy to adjust and adjust and adjust and adjust and trimtrimtrimtrim
2)2)2)2)Chemical bondingChemical bondingChemical bondingChemical bonding to denture base, as they are
made of the same material
3)Acrylic teeth are more compatiblecompatiblecompatiblecompatible with the
denture base than porcelain teeth.
4)No clicking sound.
ADVANTAGES ADVANTAGES ADVANTAGES ADVANTAGES 
OF ACRYLIC OF ACRYLIC OF ACRYLIC OF ACRYLIC 
TEETHTEETHTEETHTEETH 5) Easy to fabricatefabricatefabricatefabricate
6)6)6)6) Less Less Less Less traumatraumatraumatrauma to denture-bearing area. This is
particularly crucial for people with implants
supporting the fake tooth. If they have lost
bone or gum tissues around the implant,
acrylic teeth are more forgiving when you
grind your teeth, and will hold their position
longer than porcelain teeth.
7) Dentures made with acrylic teeth are lighterlighterlighterlighter.

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DISADVANTAGES OF DISADVANTAGES OF DISADVANTAGES OF DISADVANTAGES OF 
ACRYLIC TEETHACRYLIC TEETHACRYLIC TEETHACRYLIC TEETH
DISADVANTAGES DISADVANTAGES DISADVANTAGES DISADVANTAGES 
OF ACRYLIC OF ACRYLIC OF ACRYLIC OF ACRYLIC 
TEETHTEETHTEETHTEETH 1)Acrylic teeth are susceptible to abrasionsusceptible to abrasionsusceptible to abrasionsusceptible to abrasion, e.g. if the
patient has a habit of teeth-grinding (bruxism) or eats
rough diets, the teeth will wear down with time,
causing changes in the length of the teeth.
2)2)2)2)Easily Easily Easily Easily stainedstainedstainedstained, as they contain microscopic pits that can
hold bacteria
3)In rebasing, difficult to removedifficult to removedifficult to removedifficult to remove acrylic teeth from the
denture base

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ADVANTAGES OF ADVANTAGES OF ADVANTAGES OF ADVANTAGES OF 
PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
ADVANTAGES ADVANTAGES ADVANTAGES ADVANTAGES 
OF PORCELAIN OF PORCELAIN OF PORCELAIN OF PORCELAIN 
TEETHTEETHTEETHTEETH
1)Although both acrylic and porcelain teeth can be made
to give a natural appearance, the slightly greater greater greater greater
translucency and depth of colortranslucency and depth of colortranslucency and depth of colortranslucency and depth of color achieved with porcelain,
gives this material a slight advantage.
2)2)2)2)HarderHarderHarderHarder than acrylic more durable.
3)3)3)3)Resist wearResist wearResist wearResist wear- this preserves the normal jaw movements
and alignment for a longer period.
4)4)4)4)Resist stainingResist stainingResist stainingResist staining

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ADVANTAGES ADVANTAGES ADVANTAGES ADVANTAGES 
OF PORCELAIN OF PORCELAIN OF PORCELAIN OF PORCELAIN 
TEETHTEETHTEETHTEETH
5)Occasionally, due to resorption of the edentulous
ridges, the denture becomes loose and does not fit the
mouth at all. Instead of remaking a new denture, the
base of the denture can be replaced (called “rebasingrebasingrebasingrebasing”)
while retaining the artificial teeth so that the Occlusion
will not be altered. Because porcelain teeth do not bond
chemically to the base, they are easily easily easily easily removed from the removed from the removed from the removed from the
basebasebasebase for this purpose.
DISADVANTAGES OF DISADVANTAGES OF DISADVANTAGES OF DISADVANTAGES OF 
PORCELAINPORCELAINPORCELAINPORCELAINTEETHTEETHTEETHTEETH

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DISADVANTAGESDISADVANTAGESDISADVANTAGESDISADVANTAGES
OF PORCELAINPORCELAINPORCELAINPORCELAIN
TEETHTEETHTEETHTEETH
1)Noisyoisyoisyoisy: clicking sounds are made when porcelain
teeth comes into occlusion with another porcelain
tooth
2)2)2)2)BrittleBrittleBrittleBrittle – more likely to fracture than acrylic teeth
3)3)3)3)Do Do Do Do not bond chemicallynot bond chemicallynot bond chemicallynot bond chemically to denture base –Small
holes or metal pins are incorporated in the base of
porcelain teeth during their production to enable
mechanical bonding mechanical bonding mechanical bonding mechanical bonding to the denture base.
DISADVANTAGESDISADVANTAGESDISADVANTAGESDISADVANTAGES
OF PORCELAINPORCELAINPORCELAINPORCELAIN
TEETHTEETHTEETHTEETH
4)4)4)4)Not as compatibleNot as compatibleNot as compatibleNot as compatible as acrylic teeth with the basewith the basewith the basewith the base of the
denture – There is a serious mismatch in coefficient of
thermal and modulus of elasticity between porcelain and
acrylic resin. This may lead to crazing and cracking crazing and cracking crazing and cracking crazing and cracking of
the denture base in the region around the base of the
porcelain teeth.
5)Its density value is about twice that of acrylic teeth;
dentures constructed with porcelain teeth are
much heavierheavierheavierheavier.
6)Difficult to fabricatefabricatefabricatefabricate

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DISADVANTAGES DISADVANTAGES DISADVANTAGES DISADVANTAGES 
OF PORCELAIN OF PORCELAIN OF PORCELAIN OF PORCELAIN 
TEETHTEETHTEETHTEETH
7)Difficult to trimtrimtrimtrim, due to the hardness of this material.
8)Porcelain teeth exert more force to the underlying
supporting soft tissues, causing more traumatraumatraumatrauma to these tissues.
This is a function of the greater modulus of elasticity of
porcelain. This trauma is capable of accelerating the rate by
which the underlying bone resorbs.
9)If a denture is going to be worn against opposing natural opposing natural opposing natural opposing natural
teethteethteethteeth than plastic teeth should be selected because porcelain
teeth, being harder, could excessively wear natural excessively wear natural excessively wear natural excessively wear natural
teethteethteethteeth away.
DIFFERENCE BETWEEN DIFFERENCE BETWEEN DIFFERENCE BETWEEN DIFFERENCE BETWEEN 
ACRYLIC & PORCELAIN ACRYLIC & PORCELAIN ACRYLIC & PORCELAIN ACRYLIC & PORCELAIN 
TEETHTEETHTEETHTEETH

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DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & 
PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
PROPERTIESPROPERTIESPROPERTIESPROPERTIES ACRYLIC TEETHACRYLIC TEETHACRYLIC TEETHACRYLIC TEETH PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
1). Aesthetics AA more realistic Customized
appearance can be achieved.
AGood but not long-lasting.
AEasily stained/discolored.
AA more realistic Customized
appearance can be achieved.
ABetter & long-lasting.
AGreater translucency.
ADepth of color.
2). Clicking sound AAbsent. APresent.
3). Attachment MechanismAChemical adhesion to DB.
AMore Compatible with DB
material.
AMechanical retention to DB.
ALess Compatible with DB.
DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & 
PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
PROPERTIESPROPERTIESPROPERTIESPROPERTIES ACRYLIC TEETHACRYLIC TEETHACRYLIC TEETHACRYLIC TEETH PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
4). Coefficient of Thermal
Expansion & Modulus of
Elasticity.
ASame as DB. ASerious mismatch With DB.
ACrazing or cracking of DB.
5). Density/weight AMatch with DB.
ADentures are lighter.
ATwice that of Acrylic Resin.
ADentures are much heavier.
6). Brittleness/StrengthALess brittle.
ABetter impact strength.
AMore brittle so, easily
chip/fracture.
APoor impact strength.

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DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & 
PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
PROPERTIESPROPERTIESPROPERTIESPROPERTIES ACRYLIC TEETHACRYLIC TEETHACRYLIC TEETHACRYLIC TEETH PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
7). Hardness/Wear ALess hard , suffer abrasion.
AWear out with time.
AMuch harder, no abrasion.
AMuch durable.
ATeeth easily removed for
re-basing if required.
8). Adjustability AEasily adjusted by grinding.
AEasily polished following
adjustment.
ADifficult to adjust
AOn grinding glaze is lost.
ADifficult to polish.
9). Cost ACheap ACostly
DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & DIFFERENCE BETWEEN ACRYLIC & 
PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
PROPERTIESPROPERTIESPROPERTIESPROPERTIES ACRYLIC TEETHACRYLIC TEETHACRYLIC TEETHACRYLIC TEETH PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
10). Biocompatibility AInert in oral environment.
ATransmit less forces to
underlying tissues due to
low modulus of elasticity.
APreferred for people having
bone loss in jaws/unhealthy
gums.
APartial denture opposing
intact arch Acrylic
teeth preferred.
AInert in oral environment.
ATransmit greater forces to
underlying tissues due to
high modulus of elasticity
leading to bone loss.
AAbrade/damage the
opposing Natural tooth, so
contraindicated in dentures
opposing intact dental arch.

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IMPORTANT TIPSIMPORTANT TIPSIMPORTANT TIPSIMPORTANT TIPS
CLEANING OF DENTURESCLEANING OF DENTURESCLEANING OF DENTURESCLEANING OF DENTURES

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CLEANING OF DENTURESCLEANING OF DENTURESCLEANING OF DENTURESCLEANING OF DENTURES