Post on 31-Mar-2015
DENTURE BASESDENTURE BASESDENTURE BASESDENTURE BASES
FunctionsFunctionsFunctionsFunctions
Support & retain denture Support & retain denture teethteeth
Stress distribution - surface Stress distribution - surface area area
Improve estheticsImprove esthetics
Support & retain denture Support & retain denture teethteeth
Stress distribution - surface Stress distribution - surface area area
Improve estheticsImprove esthetics
MaterialsMaterialsMaterialsMaterials
Acrylic ResinAcrylic Resin MetalMetal
Acrylic ResinAcrylic Resin MetalMetal
Acrylic Resin BasesAcrylic Resin BasesAcrylic Resin BasesAcrylic Resin Bases
Most common typeMost common type Allows relining of the Allows relining of the
base to maintain base to maintain mucosal supportmucosal support
Most common typeMost common type Allows relining of the Allows relining of the
base to maintain base to maintain mucosal supportmucosal support
AdvantagesAdvantagesAdvantagesAdvantages
Esthetically superior to Esthetically superior to metal basesmetal bases
Ease of repairEase of repair
Esthetically superior to Esthetically superior to metal basesmetal bases
Ease of repairEase of repair
DisadvantagesDisadvantagesDisadvantagesDisadvantages
Dimensional stability- Dimensional stability- warpagewarpage
Lower strength/wear Lower strength/wear resistance than metalresistance than metal
Porous - hygienePorous - hygiene Low thermal conductivityLow thermal conductivity
Dimensional stability- Dimensional stability- warpagewarpage
Lower strength/wear Lower strength/wear resistance than metalresistance than metal
Porous - hygienePorous - hygiene Low thermal conductivityLow thermal conductivity
Metal BasesMetal BasesMetal BasesMetal Bases
Small edentulous spaces (no room for Small edentulous spaces (no room for gridworkgridwork
Less esthetic (metal show through)Less esthetic (metal show through)
Small edentulous spaces (no room for Small edentulous spaces (no room for gridworkgridwork
Less esthetic (metal show through)Less esthetic (metal show through)
Beaded Metal BaseBeaded Metal BaseBeaded Metal BaseBeaded Metal Base
Metal Filled SpaceMetal Filled SpaceMetal Filled SpaceMetal Filled Space
Retentive PostsRetentive PostsRetentive PostsRetentive Posts
AdvantagesAdvantagesAdvantagesAdvantages
Thermal conductivityThermal conductivity– Swallowing hot substancesSwallowing hot substances– Improved thermal perceptionImproved thermal perception
Thermal conductivityThermal conductivity– Swallowing hot substancesSwallowing hot substances– Improved thermal perceptionImproved thermal perception
AdvantagesAdvantagesAdvantagesAdvantages
Accuracy & Dimensional StabilityAccuracy & Dimensional Stability
– Minimal warpage (casting imbibtion)Minimal warpage (casting imbibtion)– Minimal need for a posterior palatal Minimal need for a posterior palatal
sealseal– Minimal abrasionMinimal abrasion
Accuracy & Dimensional StabilityAccuracy & Dimensional Stability
– Minimal warpage (casting imbibtion)Minimal warpage (casting imbibtion)– Minimal need for a posterior palatal Minimal need for a posterior palatal
sealseal– Minimal abrasionMinimal abrasion
AdvantagesAdvantagesAdvantagesAdvantages
Hygiene Hygiene
– Metal less porous than resinMetal less porous than resin– Less food, plaque & calculus Less food, plaque & calculus
accumulationaccumulation
Hygiene Hygiene
– Metal less porous than resinMetal less porous than resin– Less food, plaque & calculus Less food, plaque & calculus
accumulationaccumulation
AdvantagesAdvantagesAdvantagesAdvantages
Weight and BulkWeight and Bulk
– Metal bases can be cast Metal bases can be cast thinner than resin bases while thinner than resin bases while maintaining adequate maintaining adequate strength strength
Weight and BulkWeight and Bulk
– Metal bases can be cast Metal bases can be cast thinner than resin bases while thinner than resin bases while maintaining adequate maintaining adequate strength strength
Flange ExtensionFlange ExtensionFlange ExtensionFlange Extension
Tooth- tissue supported partial Tooth- tissue supported partial dentures should be maximally dentures should be maximally extended for support & retentionextended for support & retention
No overextension or impingement No overextension or impingement on movable border tissues on movable border tissues
Tooth- tissue supported partial Tooth- tissue supported partial dentures should be maximally dentures should be maximally extended for support & retentionextended for support & retention
No overextension or impingement No overextension or impingement on movable border tissues on movable border tissues
Flange ExtensionFlange ExtensionFlange ExtensionFlange Extension
Class I & II RPD’sClass I & II RPD’s
– Posterior extension same as a Posterior extension same as a complete denturecomplete denture
– Hamular notches, retromolar Hamular notches, retromolar padspads
Class I & II RPD’sClass I & II RPD’s
– Posterior extension same as a Posterior extension same as a complete denturecomplete denture
– Hamular notches, retromolar Hamular notches, retromolar padspads
Flange ExtensionFlange ExtensionFlange ExtensionFlange Extension
Soft Tissue UndercutsSoft Tissue Undercuts Soft Tissue UndercutsSoft Tissue Undercuts
Do Not RelieveExcessively
Do Not RelieveExcessively
Shorten FlangeShorten FlangeDeep UndercutDeep Undercut
XX
Acrylic Resin Finish LinesAcrylic Resin Finish LinesAcrylic Resin Finish LinesAcrylic Resin Finish Lines
Internal & external finish Internal & external finish lines should not coincidelines should not coincide
Internal & external finish Internal & external finish lines should not coincidelines should not coincide
a
major connectoredentulous ridge
slight undercut
staggered finish linesgridwork
Acrylic denturebase
Replacement TeethReplacement TeethReplacement TeethReplacement Teeth
Acrylic denture teethAcrylic denture teeth
– Cause less attrition than Cause less attrition than porcelainporcelain
– Easier to arrange, modify & Easier to arrange, modify & adjustadjust
Acrylic denture teethAcrylic denture teeth
– Cause less attrition than Cause less attrition than porcelainporcelain
– Easier to arrange, modify & Easier to arrange, modify & adjustadjust
Replacement TeethReplacement TeethReplacement TeethReplacement Teeth
Tooth FormTooth Form
– Harmonize with Harmonize with adjacent teethadjacent teeth
– Shade, shape, length, Shade, shape, length, width & occlusal formwidth & occlusal form
– Occlusion almost Occlusion almost always requires always requires adjustmentadjustment
Tooth FormTooth Form
– Harmonize with Harmonize with adjacent teethadjacent teeth
– Shade, shape, length, Shade, shape, length, width & occlusal formwidth & occlusal form
– Occlusion almost Occlusion almost always requires always requires adjustmentadjustment