IMPRESSION PROCEDURES FOR REMOVABLE PARTIAL DENTURE Guided by: Dr. A.J. Pakhan Dr. R.U. Thombare Dr. S.R. Godbole Presented By: SHASHI PATIL Specific learning objectives INTRODUCTION Impression : A negative likeness or copy in reverse of
"IMPRESSION PROCEDURES FOR REMOVABLE PARTIAL" is the property of its rightful owner. Permission is granted to
download and print the materials on this website for personal, non-commercial use only, and to display it
on your personal computer provided you do not modify the materials and that you retain all copyright
notices contained in the materials. By downloading content from our website, you accept the terms of this
agreement.
Presentation Transcript
01
IMPRESSION PROCEDURES FOR REMOVABLE PARTIAL DENTURE Guided by:
Dr. A.J. Pakhan
Dr. R.U. Thombare
Dr. S.R. Godbole Presented By:
SHASHI PATIL<br>
02
Specific learning objectives<br>
03
INTRODUCTION Impression :
“A negative likeness or copy in reverse of the surface of an object; an imprint of the teeth and adjacent structures for use in dentistry”
Partial Denture Impression :
“A negative likeness of a part or all of a partially edentulous arch.” (Glossary of Prosthodontic Terms-8)<br>
04
Need for special impression Tooth supported removable partial denture
Tooth tissue supported removable partial denture
Displacement of tissue over the ridge is 2mm and Abutment is
0.25 mm<br>
05
Classification of impression techniques<br>
06
Physiologic or Functional<br>
07
McLean’s Method Distal Extension case Custom Tray (Clinical Removable Partial Prosthodontics. Stewart KL),<br>
08
Occlusal rim Second impression (Clinical Removable Partial Prosthodontics. Stewart KL), McLean’s Method…<br>
09
Drawback of Mclean’s Method Finger pressure could not produce the same functional displacement generated by occlusal forces<br>
10
Modified the impression tray Hindel’s modification of
Maclean’s method<br>
11
Tray made over cast Modified tray for
over-impression Hindels method…<br>
12
Functional relining method It consists of adding a new surface to intaglio surface of the denture base. Frame work Constructed Metal Spacer is adapted<br>
13
Metal Spacer is removed Application of Modelling
plastic Functional relining method…<br>
14
Modelling plastic impression
is completed Scraping the inner surface of the modelling plastic to a depth of 1mm approx Functional relining method…<br>
15
FLUID WAX FUNCTIONAL IMPRESSION METHOD ( Applegate in 1937 ) Fluid waxes are-
Firm at room temperature and have the ability to flow at mouth temperature
Tissue contact is not present the impression surface will be dull
Tissue contact present the area will be glossy. Fluid wax functional method…<br>
18
Selective pressure impression To direct more force to those portion of the ridge, which are able to absorb the forces
To protect the area of the ridge which are least able to absorb forces.<br>
19
Selective pressure impression Framework on the cast Tray outline on the cast Procedure -<br>
20
Baseplate wax adapted
over the cast Warm framework pressed
on the cast Selective pressure method…<br>
21
Selective pressure method… Completed tray<br>
22
Altered Cast Technique Original concepts of the altered cast impression technique as described by
Leuopold & Kratochvil
Holmes demonstrated the least amount of movement of the base was seen at the time of placement which leads to most favourable ridge-to-denture-base relationship..<br>
23
The altered cast impression technique revisited Daniel B. Feit: JADA 1999; vol - 130 Procedure - Altered cast technique…<br>
24
Final impression Altered cast technique… The altered cast impression technique revisited Daniel B. Feit: JADA 1999; vol - 130<br>
25
Complete seating of the
framework on the cast Beading and boxing Altered cast technique… The altered cast impression technique revisited Daniel B. Feit: JADA 1999; vol - 130<br>
26
The final working altered cast Altered cast technique… The altered cast impression technique revisited Daniel B. Feit: JADA 1999; vol - 130<br>
27
Summary Distal extension base RPD are subjected to greater stress because there support is a combination of tooth and soft tissue.
Forces must be controlled:-
Maximum coverage of soft tissue,
Proper placement of components in most advantageous position and
Functional impression procedures.<br>
28
REFERENCES Clinical Removable Partial Prosthodontics. Stewart KL, Rudd KD & Kuebker WA. 2nd Edition.
McCracken’s Removable partial Prosthodontics. Carr AB,
McGivney GP & Brown DT. 11th Ed.
Removable Partial Prosthodontics. Miller EL & Grasso JE. 2nd Ed.
Selective-pressure single impression procedure for tooth-mucosa–supported removable partial dentures; Herman B. Dumbrigueand Josephine F. Esquivel: JPD 1998;80:259-61
The altered cast impression technique revisited Daniel B. Feit: JADA 1999; vol - 130<br>
