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DENTURE BASESDENTURE BASESDENTURE BASESDENTURE BASES

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FunctionsFunctionsFunctionsFunctions

Support & retain dentureSupport & retain denture

teethteeth

Stress distributionStress distribution -- surfacesurface

areaarea

ImproveestheticsImproveesthetics

Support & retain dentureSupport & retain denture

teethteeth

Stress distributionStress distribution -- surfacesurface

areaarea

ImproveestheticsImproveesthetics

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AdvantagesAdvantagesAdvantagesAdvantages

EstheticallysuperiortoEstheticallysuperiorto

metalbasesmetalbases

EaseofrepairEaseofrepair

EstheticallysuperiortoEstheticallysuperiorto

metalbasesmetalbases

EaseofrepairEaseofrepair

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DisadvantagesDisadvantagesDisadvantagesDisadvantages

DimensionalstabilityDimensionalstability--

warpagewarpageLowerstrength/wearLowerstrength/wearresistancethan metalresistancethan metal

PorousPorous -- hygienehygieneLowthermalconductivityLowthermalconductivity

DimensionalstabilityDimensionalstability--

warpagewarpageLowerstrength/wearLowerstrength/wearresistancethan metalresistancethan metal

PorousPorous -- hygienehygieneLowthermalconductivityLowthermalconductivity

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Metal BasesM

etal BasesM

etal BasesM

etal Bases

Smalledentulousspaces (noroom forSmalledentulousspaces (noroom for

gridworkgridwork

Lessesthetic (metalshowthrough)Lessesthetic (metalshowthrough)

Smalledentulousspaces (noroom forSmalledentulousspaces (noroom for

gridworkgridwork

Lessesthetic (metalshowthrough)Lessesthetic (metalshowthrough)

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BeadedM

etal BaseBeadedM

etal BaseBeadedM

etal BaseBeadedM

etal Base

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AdvantagesAdvantagesAdvantagesAdvantages

ThermalconductivityThermalconductivity

SwallowinghotsubstancesSwallowinghotsubstancesImproved thermalperceptionImproved thermalperception

ThermalconductivityThermalconductivity

SwallowinghotsubstancesSwallowinghotsubstancesImproved thermalperceptionImproved thermalperception

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AdvantagesAdvantagesAdvantagesAdvantages

HygieneHygiene

MetallessporousthanresinMetallessporousthanresin

Lessfood, plaque & calculusLessfood, plaque & calculus

accumulationaccumulation

HygieneHygiene

MetallessporousthanresinMetallessporousthanresin

Lessfood, plaque & calculusLessfood, plaque & calculus

accumulationaccumulation

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Flange ExtensionFlange ExtensionFlange ExtensionFlange Extension

ToothTooth-- tissuesupported partialtissuesupported partial

denturesshould be maximallydenturesshould be maximallyextended forsupport &extended forsupport &

retentionretention

NooverextensionorNooverextensionorimpingement on movableimpingement on movable

bordertissuesbordertissues

ToothTooth-- tissuesupported partialtissuesupported partial

denturesshould be maximallydenturesshould be maximallyextended forsupport &extended forsupport &

retentionretention

NooverextensionorNooverextensionorimpingement on movableimpingement on movable

bordertissuesbordertissues

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Flange ExtensionFlange ExtensionFlange ExtensionFlange Extension

Class I & II RPDsClass I & II RPDs

PosteriorextensionsameasaPosteriorextensionsameasa

complete denturecomplete denture

Hamularnotches, retromolarHamularnotches, retromolarpadspads

Class I & II RPDsClass I & II RPDs

PosteriorextensionsameasaPosteriorextensionsameasa

complete denturecomplete denture

Hamularnotches, retromolarHamularnotches, retromolarpadspads

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Flange ExtensionFlange ExtensionFlange ExtensionFlange Extension

Soft Tissue UndercutsSoft Tissue UndercutsSoft Tissue UndercutsSoft Tissue Undercuts

Do Not Relieve

Excessively

Do Not Relieve

ExcessivelyShorten FlangeShorten FlangeDeep UndercutDeep Undercut

XX

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Acrylic ResinFinishLinesAcrylic ResinFinishLinesAcrylic ResinFinishLinesAcrylic ResinFinishLines

Internal & externalfinishInternal & externalfinish

linesshould notcoincidelinesshould notcoincide

Internal & externalfinishInternal & externalfinish

linesshould notcoincidelinesshould notcoincide

m ajor connectoredentulousridge

slightundercut

staggered finish lines

gridwork

Acrylicdenture

b a s e

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Replacement ToothReplacement Tooth

ModificationModification

Replacement ToothReplacement Tooth

ModificationModification

palatalmajorconnector

ReplacementtoothReplacementtooth

Proximal PlateProximal Plate

adjust underneathocclusal surface adjust underneathocclusal surface

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Occlusal SchemeOcclusal SchemeOcclusal SchemeOcclusal Scheme

Variesfrom fullybalancedVariesfrom fullybalanced

(opposingacomplete denture),(opposingacomplete denture),toanterior disclusiontoanterior disclusion

As moreoftheocclusaltableisAs moreoftheocclusaltableis

involved, the moreabalancedinvolved, the moreabalancedocclusalscheme maybeofocclusalscheme maybeof

benefitbenefit

Variesfrom fullybalancedVariesfrom fullybalanced

(opposingacomplete denture),(opposingacomplete denture),toanterior disclusiontoanterior disclusion

As moreoftheocclusaltableisAs moreoftheocclusaltableis

involved, the moreabalancedinvolved, the moreabalancedocclusalscheme maybeofocclusalscheme maybeof

benefitbenefit