Artificial teeth

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ARTIFICIAL TEETHARTIFICIAL TEETHARTIFICIAL TEETHARTIFICIAL TEETH PRESENTED BY
DR. HASHMAT GUL
DEMONSTRATOR, AMC,
DENTAL MATERIALS.
INTRODUCTIONINTRODUCTIONINTRODUCTIONINTRODUCTION
Constitute one of the main components of Denture....
COMMONLY USED MATERIALSCOMMONLY USED MATERIALSCOMMONLY USED MATERIALSCOMMONLY USED MATERIALS
Acrylic
Porcelain
Composite

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IDEAL REQUIREMENTSIDEAL REQUIREMENTSIDEAL REQUIREMENTSIDEAL REQUIREMENTS
1).).).). ESTHETICSESTHETICSESTHETICSESTHETICS
Should 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
Light weight dentures.
4).4).4).4). STRONG & TOUGHSTRONG & TOUGHSTRONG & TOUGHSTRONG & 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
Polymer,Polymer,Polymer,Polymer, PMMA
Initiator,Initiator,Initiator,Initiator, Benzyoyl peroxide
PigmentsPigmentsPigmentsPigments
LIQUIDLIQUIDLIQUIDLIQUID
MonomerMonomerMonomerMonomer, MMA
CrossCrossCrossCross----linking agentlinking agentlinking agentlinking agent, Ethylene-glycol-dimethacrylate.
Inhibitor,Inhibitor,Inhibitor,Inhibitor, Hydroquinone.
Activator,Activator,Activator,Activator, N N′-dimethyl-p-toluidine.
PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
ClayClayClayClay (Kaolin)
SilicaSilicaSilicaSilica
BinderBinderBinderBinder (Feldspar)
GlassesGlassesGlassesGlasses

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FABRICATIONFABRICATIONFABRICATIONFABRICATION
Reusable metal molds using
Dough Molding Technique.
Injection Molding Technique.
Highly cross-linked resins used to
resist crazing.
PORCELAINPORCELAINPORCELAINPORCELAIN TEETHTEETHTEETHTEETH
Fabrication involves
Compaction
Firing
Standard shapes & sizes produced by
using molds 30% larger than required
to allow shrinkage during firing.
Small holes or metal pins are
incorporated in the base of Porcelain
teeth during their production
Mechanical attachment.
ADVANTAGES OFADVANTAGES OFADVANTAGES OFADVANTAGES OF

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ADVANTAGESADVANTAGESADVANTAGESADVANTAGES
OF ACRYLICOF ACRYLICOF ACRYLICOF ACRYLIC
TEETHTEETHTEETHTEETH 1) Easy to adjust andadjust andadjust andadjust 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.
TEETHTEETHTEETHTEETH 5) Easy to fabricatefabricatefabricatefabricate
6)6)6)6) LessLessLessLess 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 OFDISADVANTAGES OFDISADVANTAGES OFDISADVANTAGES OF
DISADVANTAGESDISADVANTAGESDISADVANTAGESDISADVANTAGES
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) EasilyEasilyEasilyEasily 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 OFADVANTAGES OFADVANTAGES OFADVANTAGES OF
OF PORCELAINOF PORCELAINOF PORCELAINOF PORCELAIN
TEETHTEETHTEETHTEETH 1) Although both acrylic and porcelain teeth can be made
to give a natural appearance, the slightly greatergreatergreatergreater
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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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 easilyeasilyeasilyeasily removed from theremoved from theremoved from theremoved from the
basebasebasebase for this purpose.
DISADVANTAGES OFDISADVANTAGES OFDISADVANTAGES OFDISADVANTAGES OF
PORCELAINPORCELAINPORCELAINPORCELAIN TEETHTEETHTEETHTEETH

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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) DoDoDoDo 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 bondingmechanical bondingmechanical bondingmechanical bonding to the denture base.
OF PORCELAINPORCELAINPORCELAINPORCELAIN
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 crackingcrazing and crackingcrazing and crackingcrazing 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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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 naturalopposing naturalopposing naturalopposing natural
teethteethteethteeth than plastic teeth should be selected because porcelain
teeth, being harder, could excessively wear naturalexcessively wear naturalexcessively wear naturalexcessively wear natural
teethteethteethteeth away.
DIFFERENCE BETWEENDIFFERENCE BETWEENDIFFERENCE BETWEENDIFFERENCE BETWEEN
ACRYLIC & PORCELAINACRYLIC & PORCELAINACRYLIC & PORCELAINACRYLIC & PORCELAIN

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DIFFERENCE BETWEEN ACRYLIC &DIFFERENCE BETWEEN ACRYLIC &DIFFERENCE BETWEEN ACRYLIC &DIFFERENCE BETWEEN ACRYLIC &
PROPERTIESPROPERTIESPROPERTIESPROPERTIES ACRYLIC TEETHACRYLIC TEETHACRYLIC TEETHACRYLIC TEETH PORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETHPORCELAIN TEETH
1). Aesthetics A more realistic Customized
appearance can be achieved.
Good but not long-lasting.
Easily stained/discolored.
A more realistic Customized
appearance can be achieved.
Better & long-lasting.
Greater translucency.
Depth of color.
2). Clicking sound Absent. Present.
3). Attachment Mechanism Chemical adhesion to DB.
More Compatible with DB
material.
Mechanical retention to DB.
Less Compatible with DB.
4). Coefficient of Thermal
Expansion & Modulus of
Elasticity.
Same as DB. Serious mismatch With DB.
Crazing or cracking of DB.
5). Density/weight Match with DB.
Dentures are lighter.
Twice that of Acrylic Resin.
Dentures are much heavier.
6). Brittleness/Strength Less brittle.
Better impact strength.
More brittle so, easily
chip/fracture.
Poor impact strength.

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7). Hardness/Wear Less hard , suffer abrasion.
Wear out with time.
Much harder, no abrasion.
Much durable.
Teeth easily removed for
re-basing if required.
8). Adjustability Easily adjusted by grinding.
Easily polished following
adjustment.
Difficult to adjust
On grinding glaze is lost.
Difficult to polish.
9). Cost Cheap Costly
10). Biocompatibility Inert in oral environment.
Transmit less forces to
underlying tissues due to
low modulus of elasticity.
Preferred for people having
bone loss in jaws/unhealthy
gums.
Partial denture opposing
intact arch Acrylic
teeth preferred.
Inert in oral environment.
Transmit greater forces to
underlying tissues due to
high modulus of elasticity
leading to bone loss.
Abrade/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

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