55thth lecture lecture20182018

Construction of Complete DentureConstruction of Complete DentureClinical and laboratory stepsClinical and laboratory steps

Clinical Clinical • ComplaintComplaint→Prognoses→Prognoses

Taking first impressionTaking first impression• Outlining borders of special trayOutlining borders of special tray• Transform special tray to Transform special tray to

functional trayfunctional traySecondary impressionSecondary impression

• Jaw registration with occlusal rimsJaw registration with occlusal rims(ear bow, face bow registration)(ear bow, face bow registration)Tooth selectionTooth selection(size, form, colour)(size, form, colour)

• Try in, trial dentureTry in, trial denture• Fitting Fitting • Short time recallShort time recall• Long time recallLong time recall

LabLab

• First castFirst cast• Special traySpecial tray• Secondary cast (functional cast) Secondary cast (functional cast)

Occlusal rims (baseplate +wax Occlusal rims (baseplate +wax rims)rims)

• Mounting in articulator, Setting up Mounting in articulator, Setting up the teeth, Trial denturethe teeth, Trial denture

• Flasking, Packing, Ready dentureFlasking, Packing, Ready denture

Special traySpecial tray

• ShellaShellacc• Acrylic resin

– SelfSelf curing acrylic curing acrylic

– Light curing acrylicLight curing acrylic

• PlasticPlastic

Types of special trayTypes of special tray

• Close-fitting trayClose-fitting tray

• Spaced special traySpaced special tray

Constructing of functional trayConstructing of functional trayBorder moldingBorder molding

Definition of secondary Definition of secondary impressionimpression

Secondary impression of partial or total Secondary impression of partial or total edentulous jaw is taken with edentulous jaw is taken with special special ((functionalfunctional) ) tray. Patient do special tray. Patient do special functional movement during taking functional movement during taking impression.impression.

Impression TechniquesImpression Techniques

• Mucostatic Impression TechniqueMucostatic Impression Technique

• MucodiMucodisplactive Impression Techniquesplactive Impression Technique

Mucostatic Impression Mucostatic Impression TechniqueTechnique

IImpressionmpression of the undisplaced mucosa. of the undisplaced mucosa. Mucostatic Impression records the soft tissues Mucostatic Impression records the soft tissues in the undisplaced (resting) position. in the undisplaced (resting) position.

Indication Using Indication Using MucostatiMucostatic c Impression TechniqueImpression Technique

• Thin Thin submucosasubmucosa• It can not pressIt can not press• Bad clinical anatomy Bad clinical anatomy

and structureand structure• „„WestWest witch witch””

Using Using MucostatiMucostatic Impression c Impression TechniqueTechnique

AdvantageAdvantage

• It can take for thin It can take for thin mucosamucosa

• Easy to take ( with less Easy to take ( with less experience)experience)

DisadvantageDisadvantage

• No registration of bone No registration of bone irregulatoritiesirregulatorities

• Foiling (relief of master Foiling (relief of master cast)cast)

• Taking secondary Taking secondary impression with low impression with low viscosity impression viscosity impression materialsmaterials

MucodiMucodisplacive Impression splacive Impression TechniqueTechnique

It is a type of secondary impression. High It is a type of secondary impression. High viscosity impression materials record an viscosity impression materials record an impression of the mucosa under load impression of the mucosa under load during functional movements. during functional movements.

Indication of Indication of MucodiMucodisplacive splacive Impression TechniqueImpression Technique

• Thick submucThick submucosaosa• It can compressedIt can compressed • Good clinical anatomy Good clinical anatomy

structuresstructures• ““EastEast witch” witch”

Using Using MucoMucodisplacive displacive Impression TechniqueImpression Technique

AdvantageAdvantage• Correct jaw Correct jaw

registration registration • No foilingNo foiling• LessLess ulceration, ulceration,

mucosal injurymucosal injury• Good functional Good functional

stabilitystability

DisadvantageDisadvantage

• Enough thick Enough thick submucosasubmucosa

• Taking Taking mucodisplacive mucodisplacive impression is impression is complicatedcomplicated

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

Secondary ImpressionSecondary Impression

RRadix relictaadix relicta

Secondary ImpressionSecondary Impression

„„be careful”be careful”

FOILINGFOILING

Primary castPrimary cast – – Secondary castSecondary cast