Transcript
Page 1: Special Impression Techniques - Bds 2oo7bds007.yolasite.com/resources/4-Special Impression Techniques.pdf · Special Impression Techniques •Displaced (Flabby) maxillary ridge •Unemployed

Dr Muhammad Rizwan Memon FCPS

Assistant Professor

Special Impression

Techniques

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Special Impression Techniques

• Displaced (Flabby) maxillary ridge

• Unemployed mandibular ridge

• Flat (Atrophic) Mandibular Ridge covered

with Atrophic Mucosa

• Denture space impression/ Neutrozone

Impression Technique

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Impression of Flabby (Displaced)

Maxillary Ridge in all Areas

Clinical appearance Fabrication of Custom Tray

Custom Tray with adhesive Tape Completed POP Impression

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Impression of Flabby Ridge in

Anterior Portion with ZOE & POP

Clinical appearance Fenestration of Custom Tray

Functional Border Molding Custom Tray with FBM

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Making Impression ZEO ZEO Impression

Application of POP Completed Impression

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Impression of Flabby Maxillary

Ridge in Anterior Portion with PVS

Medium-Bodied PVS Light-Bodied PVS

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Fibrous (Unemployed) Posterior

Mandibular Ridge

Fibrous posterior mandibular ridge. This

ridge as such is not useful for support

Crestal area cleared of tracing compound,

tray perforated on crestal area

Preliminary stage using tracing compound

Definitive impression using light-bodied

polyvinyl siloxane

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Flat (Atrophic) Mandibular Ridge

covered with Atrophic Mucosa

(Admix Impression Technique)

Atrophic mandibular ridge Definitive Impression with admix of

3 parts by weight of (red) impression

compound to 7 parts by weight of

greenstick

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Denture Space (Neutral zone)

Impression

Different postures of patient during

the moulding of neutral zone

Stainless steel wire placed in

spiral fashion with the help of

self cure acrylic pillars

Occluso vertical dimension of patient

mounted on articulator

Resorbed mandibular ridge

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Replacement of tissue conditioner

with modeling wax

Recorded neutral zone with tissue

conditioner

Plaster matrices made around the

recorded zone.

Different postures of patient during

the moulding of neutral zone

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Finally fabricated denture in

harmony with neutral zone Teeth positioned relative to neutral

zone template

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wax try-in with the

plaster index

(a) buccally and

(b) Lingually

Plaster index around the neutral

zone impression

An example of the

neutral zone from the

(a) lateral and

(b) posterior view

Base plate with self-cure acrylic

pillars and with a vertical fin

Denture Space (Neutral zone)

Impression


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