Simplified distal extension impression technique/ oral surgery courses

Simplified DistalSimplified Distal
Extension ImpressionExtension Impression
TechniqueTechnique
INDIAN DENTAL ACADEMYINDIAN DENTAL ACADEMY
Leader in continuing Dental EducationLeader in continuing Dental Education
www.indiandentalacademy.comwww.indiandentalacademy.com

IntroductionIntroduction

contentscontents
 Introduction.Introduction.
 Review of distal extension partial dentureReview of distal extension partial denture
impression techniques.impression techniques.
– Mclean’s techniqueMclean’s technique
– hindel’s techniquehindel’s technique
– Modified hindel’s techniqueModified hindel’s technique
– Functional reline techniqueFunctional reline technique
– Fluid wax techniqueFluid wax technique
– Selective pressure techniqueSelective pressure technique
– Altered cast techniqueAltered cast technique

 Simplified distal extension impressionSimplified distal extension impression
techniquetechnique
 AdvantagesAdvantages
 RequirementsRequirements
 ProcedureProcedure
 ConclusionConclusion
 ReferencesReferences

Review of Distal Extension PartialReview of Distal Extension Partial
Denture TechniquesDenture Techniques
 1.Mclean’s Technique1.Mclean’s Technique
This technique records tissues of ridges inThis technique records tissues of ridges in
Functional form and then relating it toFunctional form and then relating it to remainderremainder
of arch by a second impression.of arch by a second impression.
Disadvantage:Disadvantage:
Finger pressure on alginate stock trayFinger pressure on alginate stock tray
cannot produce same loading as bitingcannot produce same loading as biting
force.force.
Procedure:Procedure:

 2.Hindel’s Technique2.Hindel’s Technique
First,impression of ridge is made with ZnOEFirst,impression of ridge is made with ZnOE
then special trays (with holes) for secondthen special trays (with holes) for second
impression to apply finger pressure throughimpression to apply finger pressure through thethe
holes of tray to underlying impression of ridge.holes of tray to underlying impression of ridge.
Advantage:Advantage:
Tissue recorded under load.Tissue recorded under load.
Tray position can be altered andTray position can be altered and
subsequently premature contactssubsequently premature contacts..

 3.Modification of Hindel’s technique3.Modification of Hindel’s technique
Here, only one tray is used instead of two.Here, only one tray is used instead of two.
DisadvantagesDisadvantages::
1.Time consuming.1.Time consuming.
2.Injection of alginate may not record the2.Injection of alginate may not record the
teeth portionteeth portion

 4.Functional Reline Technique.4.Functional Reline Technique.
Functional Impression is made after theFunctional Impression is made after the
partial denture is fabricated.partial denture is fabricated.
Advantage:Advantage:
Soft tissue displacement can be madeSoft tissue displacement can be made
controlled by controlling the amount of reliefcontrolled by controlling the amount of relief
provided.provided.
Disadvantages:Disadvantages:
1.Failure to maintain correct relationship1.Failure to maintain correct relationship
between framework and abutment teeth.between framework and abutment teeth.
2.Change in vertical dimension.2.Change in vertical dimension.

 5.Fluid wax technique5.Fluid wax technique
1.Time consuming.1.Time consuming.
2.Impression with increased tissue2.Impression with increased tissue
distortion.distortion.
Procedure: first a custom tray is made, itsProcedure: first a custom tray is made, its
peripheral extensions are corrected, then borderperipheral extensions are corrected, then border
moulding is performed and tray is relieved formoulding is performed and tray is relieved for
impression materialimpression material

 6.Selected pressure technique6.Selected pressure technique
Objective:Objective:
Difficult to demarcate the tissues likeDifficult to demarcate the tissues like
stress and non-stress bearing areas.stress and non-stress bearing areas.

 7.Altered cast technique7.Altered cast technique
In this, fluid wax technique impression ofIn this, fluid wax technique impression of
displaced ridge is made by a tray attached todisplaced ridge is made by a tray attached to
denture framework and master cast is altereddenture framework and master cast is altered
to accommodate new ridge impression henceto accommodate new ridge impression hence
so called altered cast technique.so called altered cast technique.
Disadvantages:Disadvantages:
1.More number of steps involved.1.More number of steps involved.
2.Difficult procedure.2.Difficult procedure.

Simplified Distal ExtensionSimplified Distal Extension
Impression TechniqueImpression Technique
 Advantages:Advantages:
1.Convenient.1.Convenient.
2.Less time consuming2.Less time consuming..
3.Simple.3.Simple.
 Requirements:Requirements:
Special tray on diagnostic model.Special tray on diagnostic model.
Tray adhesive.Tray adhesive.
Putty silicone impression material.Putty silicone impression material.
medium body silicone impression material.medium body silicone impression material.

ReferencesReferences
1.Glen P.Mcginey,Alan B.Carr1.Glen P.Mcginey,Alan B.Carr
McCraken’s Removal Partial Denture Prosthodontics 10 edi.McCraken’s Removal Partial Denture Prosthodontics 10 edi.
2.McCraken’ WL2.McCraken’ WL
A comparision of tooth-borne and tissue borne removable partial dentures.A comparision of tooth-borne and tissue borne removable partial dentures.
JPD 1953,vol 3,pg 375-381.JPD 1953,vol 3,pg 375-381.
3.Hindels GW3.Hindels GW
Stress analysis in distal extension partial dentures.Stress analysis in distal extension partial dentures.
JPD 1957,vol7,pg197-205JPD 1957,vol7,pg197-205
4.Kramer HM4.Kramer HM
Impression techniques for removable partial denturesImpression techniques for removable partial dentures
JPD 1961 vol11,pg84JPD 1961 vol11,pg84
5.Wilson JH5.Wilson JH
Partial dentures relining the saddle supported by the mucosa and alveolarPartial dentures relining the saddle supported by the mucosa and alveolar
bonebone
JPD1953,vol3,pg807-813JPD1953,vol3,pg807-813

6.Fitzloff RA6.Fitzloff RA
Functional impressions with thermoplastic materials for reline procedures.Functional impressions with thermoplastic materials for reline procedures.
7.Devan MM7.Devan MM
Basic principles of impression makingBasic principles of impression making
8.Applegate OC8.Applegate OC
Essentials of removable partial denture prosthesis,2 edi.,1960Essentials of removable partial denture prosthesis,2 edi.,1960
9.leupoldRJ9.leupoldRJ
An altered cast procedure to improve support for removable partial denturesAn altered cast procedure to improve support for removable partial dentures
10.Rapauno J10.Rapauno J
a single tray dual impression technique for distal extension partial denturesa single tray dual impression technique for distal extension partial dentures

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