dentistry

1. EVALUATION OF
IMPRESSION
TECHNIQUE IN
COMPLETE DENTURE
Dr. Sayali
2ND YR PG
1

2. CONTENTS
• INTRODUCTION
• IMPRESSION THEORIES AND TECHNIQUES
• IMPRESSION TECHNIQUES IN COMPROMISED
SITUATIONS
• EVALUATION OF DIFFERENT IMPRESSION
TECHNIQUES
• CONCLUSION

3. INTRODUCTION
• The journey towards successful denture fabrication begins
with making accurate impressions.
• All subsequent steps that are necessary for complete
denture fabrication will be greatly diminished if the denture
base does not fit due to inadequate impression.

4. DEFINITION
• WINKLER
An impression is defined as an imprint or negative likeliness of
teeth or edentulous areas where teeth have been removed or of
both made in a plastic material that becomes relatively hard or
set while in contact with these tissues.
• GPT-9
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

5. • BOUCHER -
An impression is a record of negative form of tissues of oral
cavity that make-up the basal seat of denture.
• LEVIN -
A complete denture impression is a negative registration of
entire denture bearing, stabilizing and border seal areas present
in an edentulous mouth.
• IMPRESSION TECHNIQUE
A method and manner used in making a negative likeness- GPT
9

6. How Do we Choose the
Correct Impression
Technique??
• Condition of the underlying tissue?
• One- or a two-step impression procedure?
• Impression materials and techniques for producing the master cast?
• Border moulding?
6

7. THE BASIC REQUIREMENT OF
IMPRESSION MAKING:-
1. Knowledge of oral anatomy
2. Knowledge of basic reliable technique.
3. Knowledge and understanding of materials.
4. Skill.
5. Patient management

8. 8
P - Preservation of the
alveolar ridges.
R -
Retention
E -
Esthetics.
S -
Stability.
S -
Support.
OBJECTIVES OF IMPRESSION MAKING

9. THEORIES OF IMPRESSION
MAKING
• No pressure / mucostatic
concept.
• Pressure / mucocompressive
concept.
• Minimal pressure concept.
• Selective pressure concept.

10. PRESSURE TECHNIQUE
• Based on Mucocompressive theory.
• Initiated by GREENE BROTHERS.
• They believed that displacing the soft tissues into their
supporting form while making impression would result in
better distribution of occlusal forces to basal seat.
10
Complete denture impression techniques: Evidence-based or philosophical: Shefali
singla: Indian J Dent Res, 2007 18(3).

11. Peripheral muscle trimming is done and PPS is recorded
Tray is held under biting pressure for 2 min
With this tray another impression is taken
Preliminary impression is made using impression
compound
Occlusal rims are fabricated and VD is adjusted
Cast is poured and special tray is fabricated using baseplate
11
Theories of impression making and their rationale in complete denture prosthodontics. Alok
Dwivedi: Journal of orofacial research. 2013.3(1)

12. • Oral tissues are resilient , thus tends to return back to its
original anatomic position once forces are relieved.
• During function the constant pressure exerted onto the soft
tissues limit the blood circulation leading to residual ridge
resorption.
12
Theories of impression making and their rationale in complete denture prosthodontics.
Alok Dwivedi: Journal of orofacial research. Jan-March 2013.3(1): 34-37
Disadvantages

13. MINIMAL PRESSURE TECHNIQUE
• Concept of mucostatics was introduced by HARRY L.
PAGE in 1938.
• It is based on mucostatic principle
• Interfacial surface tension - main retentive mechanism
13
Theories of impression making and their rationale in complete denture prosthodontics.
Alok Dwivedi: Journal of orofacial research. Jan-March 2013.3(1): 34-37

14. • Acc. To this theory
The impression material should record without distortion,
every detail of the mucosa so that the completed denture
would fit all minute elevations and depressions.
Impressions should cover only the area of oral cavity where
the mucous membrane is firmly attached to the underlying
bony structure.
14
Theories of impression making and their rationale in complete denture prosthodontics
Alok Dwivedi: Journal of orofacial research. Jan-March 2013.3(1): 34-37

15. • Denture closely adapted to the denture bearing mucosa but
poor peripheral seal.
• Dentures with good stability but poor retention
15
Theories of impression making and their rationale in complete denture
prosthodontics Alok Dwivedi: Journal of orofacial research. Jan-March 2013.3(1): 34-
37
Disadvantages

16. Variations in the technique
1. MUCOSEAL TECHNIQUE
Stated by Pryor in 1948 as the variation to mucostatic technique.
Anterior lingual border molded by tongue.
Base is extended horizontally backward ,over sublingual gland
towards tongue to effect a border seal.
Thus this technique utilizes the benefit of minimal pressure and
also provides maximum extension of denture borders and
maximum coverage of denture bearing area.
17
Theories of impression making and their rationale in complete denture
prosthodontics. Alok Dwivedi: Journal of orofacial research. Jan-March
2013.3(1): 34-37

17. 2. SUB-ATMOSPHERIC TECHNIQUE
 Milo V. Kubalik and Bert C. Buffington
 The objective to reduce the stress on any given tissue by
increasing load bearing area.
 The form of the tissue is recorded vertically and laterally, when a
controlled partial vacuum is established in impression tray .
 It is maintained in the mouth without direct mechanical support.
 A vacuum is developed between the soft tissues and the tray.
 A recording material in a fluid state flows from the border region
into the evacuated space and develops the basal tissues.
18
Theories of impression making and their rationale in complete denture prosthodontics Alok Dwivedi:
Journal of orofacial research. Jan-March 2013.3(1): 34-37

18. SELECTIVE PRESSURE TECHNIQUE
• Advocated by BOUCHER in 1950
• It combines the principles of both pressure and minimal
pressure procedures.
• The philosophy of the selective pressure technique is that
the certain areas of the maxilla and mandible are by
nature better adapted to withstand extra loads from the
forces of mastication.
19
Theories of impression making and their rationale in complete denture prosthodontics. Alok
Dwivedi: Journal of orofacial research. Jan-March 2013.3(1): 34-37

19. Complete Denture Impression Techniques Practiced by Private Dental
Practitioners: A Survey
Vinay R. Kakatkar
• A questionnaire was prepared and sent to 400 dental practitioners.
Only 340 responded. The practitioners were in the age group of 30–
56 years. The dental surgeons were from pune, Mumbai, Goa, Satara,
Nashik, Indore, Jodhpur, Nanded, Aurangabad, Sangli, Kolhapur.
The questionnaire had five questions.
• RESULTS:
It was observed that 78 % use impression compound to
make primary impressions. 21 % use Alginate.
For Fabricating custom trays 67 % use tray material or
cold cure while 33 % still use base plate custom trays.
The border moulding material used by 83 % is low fusing
compound (Green stick). 17 % use putty elastomer.
For making final impressions 73 % use ZnoE or non-
eugenol pastes. 19 % use light body elastomer.

20. Primary stress bearing area in maxilla
Residual alveolar ridge
Secondary Stress bearing area in Maxilla
Rugae
Relief area
Maxilla – incisive papilla, midpalatine raphe

21. 22
Boucher’s prosthodontic treatment for edentulous patients.
Primary Stress bearing area.
Buccal shelf area
Secondary Stress bearing areas
Retromolar pad and all ridge slope.
Relief area
Crest of the knife edged ridge, Tori

22. Cut tissue stops out of the wax
Adapt 1mm thickness of base plate wax to the cast to allow
space for impression material
Preliminary impression is made with imp compound
Remove the spacer wax, make holes and make a definitive final
impression.
23
Selective pressure technique . Jacqueline P. Duncan: The journal of prosthetic
dentistry: 2004. 92(3): 299-302
Fabricate custom tray and perform border moulding
It gave sufficient value like seal without exaggerated pressure
on soft tissues

23. 24
The accuracy,design and uses of custom impression trays in prosthodontics- a
clinical guide. Manish Kinra etal: IJMDS 2009: 1(1) 29-39

24. (a) A. Roy Mac Gregor’s design, (b) Neill’s design
(a) Boucher design, (b) Morrow, Rudd, Rhoads design
(a) J.J Sharry’s design, (b) Bernard Levin’s design

25. MUCO-
COMPRESSIVE
TECHNIQUE
MUCO-STATIC
TECHNIQUE
SELECTIVE
PRESSURE
TECHNIQUE
Based on pressure
principle
Based on mucostatic
principle
combines the principles
of both pressure and
minimal pressure
procedures.
Pressure applied was
too much
No or minimal
pressure was
applied
Pressure was applied
selectively
Harmful to the health
of the tissue
• Increased bone
resorption
• Transient ischemia
• Pain and soreness
High regards for the
tissue health and
preservation.
Less interferences to
surrounding tissues
Theories of impression making and their rationale in complete denture prosthodontics Alok
Dwivedi: Journal of orofacial research. Jan-March 2013.3(1): 34-37

26. Better performance
during function
Not satisfactory Satisfactory
Dentures would fit well
during mastication only
Retention was
transient.
Loss of retention of
denture at rest due to
tissue rebound.
Dentures fit well
during rest. Retention
is compromised during
function
Denture fit well during
function as well as at
rest
More tissue coverage.
So better retention,
stability and support
Short flanges affected
retention
Good stability due to
close adaptation of
denture bases.
Maximum tissue
coverage with minmum
interferences to
surrounding tissues
Tissues were in function
throughout the day
Tissues are in a state of
rest throughout the
day except in function
Tissues are in a state of
rest throughout the
day except in function
27

27. Cohesion and adhesion
were considered as the
important factors
Surface tension was
considered as the only
factor responsible for
retention
Cohesion, adhesion,
atm. Pressure, surface
tension etc all were
considered as
important factors for
retention
Well suited for well
formed and resorbed
ridges
Patient with flabby
tissue were difficult to
treat
Well suited for cases
like sharp ,thin, flat,
and flabby ridges
Patient with poor
ridges or with deficient
attached gingiva were
difficult to treat.
widely preferred,
especially, in the case
of well – formed
healthy ridges.
Good esthetics Compromised esthetics
due to short denture
flanges
Good esthetics
Tendency for
overextension
Tendency for under
extensions
Minimal tendency for
overextension or
underextensions
28

28. IMPRESSION TECHNIQUES
• Based on the theories of impression making
Mucocompressive technique (pressure technique)
Mucostatic technique (minimal pressure technique)
Selective pressure technique ( selective pressure)
• Based on the mouth positioning
Open mouth technique
Closed mouth technique
29
A critical analysis of mid-century impresslon Techniques for full dentures carl 0.
Boucher, j. Pros. Den. Julv, 1951 : 1(4): 472-491

29. • Based on manipulation
Hand –manipulation
Functional movements
• Based on Type of tray
Stock tray
• Caulk’s endentulous rimlock trays
• Mc Gowen Winkler Trays (mandibular)
• STOCK trays (square, round or tapering shapes of
ridges)
Custom or special tray :
• Shellac, Acrylic, Wax
30
Indian dental academy; august 2013

30. OPEN MOUTH TECHNIQUE
• Open mouth impression are made with the tray that is held
by the dentist.
• Attempts to record the limiting tissues in their active state.
• The detailed record of these limiting tissues is imprinted
into the final impression material by manipulation of these
tissues by the operator or by the patient or both.
31
A critical analysis of mid-century impresslon Techniques for full dentures Carl 0. Boucher, j. Pros.
Den. Julv, 1951 : 1(4): 472-491

31. CLOSED MOUTH TECHNIQUE
• Supporting tissues recorded in a functional relationship.
• Since impression was recorded in functional positions, the
final dentures would retain well and cannot be dislodged
during functional movements of the jaw.
32
A critical analysis of mid-century impresslon Techniques for full dentures Carl 0.
Boucher, j. Pros. Den. Julv, 1951 : 1(4): 472-491

32. 33
OPEN MOUTH TECHNIQUE CLOSED MOUTH
TECHNIQUE
Operator can visualize whether
muscle trimming is done
properly
Operator can’t visualize
whether muscle trimming is
done properly
Various muscle movements can
be carried out easily
Border molding movements are
carried out by patient
Wax rims are not mandatory for
making final impression.
Wax rims on baseplate are
mandatory for making final
impression
Vertical dimension is
established after making the
impression.
Vertical dimension is
established before making the
impression.

33. Pressure applied can be varied. Too much pressure applied
which is not suitable for health
of the mucosa and can result in
Alvelor bone resorption
Ishemia,
pain and soreness
No tendency for under or
overextension.
Tendency for overextension or
underextensions.
Denture retention can be
predicted in closed as well as
open mouth
Cant be predicted in open
mouth
34
A critical analysis of mid-century impresslon Techniques for full dentures Carl 0.
Boucher, j. Pros. Den. Julv, 1951 : 1(4): 472-491

34. IMPRESSION TECHNIQUES IN
COMPROMISED SITUATIONS
35

35. • Compromise the quality of treatment
• Conny D.J. stated that patients gagging problem can be due to
iatrogenic, physiologic, psychological, anatomic or organic
disturbances
• It should be identified and treated before making the impression.
Gag Reflex: Causes and Management Geeta Goyal Int J Dent Med Res . NOV – DEC 2014: 1(4)

36. • The patient can be managed
by :
Pharmacologic measures
Psychologic intervention
Prosthodontic management
Gag Reflex: Causes and Management Geeta Goyal Int J Dent Med Res .
NOV – DEC 2014: 1(4)

37. • Psychological –
• Preparation of material should be done behind patients chair.
• Attention is diverted.
• Pharmacological –
• Peripherally acting syrups, gels, local anesthetics can be tried.
• Centrally acting antihistamines, sedatives, tranquilizers are
used.
Gag Reflex: Causes and Management Geeta Goyal Int J Dent Med Res . NOV
– DEC 2014: 1(4)

38. Prosthodontic management
• Patient should be seated upright or forward tilt head position.
• Excess thickness, over extensions or improper post dam is corrected.
• Impression materials with shorter setting time can be used.
39
Gag Reflex: Causes and Management Geeta Goyal Int J Dent Med Res . NOV – DEC 2014: 1(4)

39. • Singer’s marble technique
No examination.
Pt was asked to place 5 marbles successively in his
mouth for one week
Assessed whether he is able to do so
Impression procedure were attempted after application
of topical LA.
Lower baseplate was inserted and pt was asked to keep 3 marbles
along with that.. training bead to maintain tongue position
Upper baseplate was introduced and marbles were
discontinued
Jaw relation and try – in were performed
Lower denture followed by upper denture is inserted
1st visit
2nd visit
3rd visit
4th visit
5th visit
6th visit
7-8th visit
Gag Reflex: Causes and Management Geeta Goyal Int J Dent Med Res . NOV – DEC 2014: 1(4)

40. Evaluation of the effect of (salt and sugar) on gagging reflex.
YasmenTaha AL-Alousi, B.D.S,M.Cs. *Zainab Salih, B.D.S,M.Cs WasmaaSadiq Mahmood,B.D.S,M.Cs.
• Materials and method: 120 subjects suffering from gagging reflex
ranging from 30-50 years old were examined to assess the
gagging reflex response when using stock tray, stock tray with
alginate, applying sugar on the tongue then impression and salt
then an alginate impression also taken.
• Results: the results revealed the increase in gagging reflex with
impression material compared with tray alone, also the use of
salt and sugar decrease the gagging reflex.
• Conclusion: the effect of salt and sugar on gagging reflex as it
blocks the transmission of impulses that cause gagging reflex
also the psychological effect of these two tastes on gagging
sensation during taking the impression.

41. • A flabby ridge is one which becomes displaceable due to fibrous
tissue deposition.
• Most frequently seen in the upper anterior region.
• The presence of displaceable denture bearing tissue often present a
difficulty when making complete dentures.
A review of prosthodontic management of fibrous ridges R. W. I. Crawford1 Br Dent J 2005;
199 : 715-19.

42. • Unless managed properly this flabby ridges can affect the support,
retention and stability of complete denture.
• Masticatory forces can displace the denture bearing area, leading to
loss of peripheral seal.
• Forces exerted during the impression making can result in displaced
tissues.
A review of prosthodontic management of fibrous ridges R. W. I. Crawford1 Br Dent J 2005;
199 : 715-19.

43. • Published studies indicates that flabby ridges occurs about 24% in
maxilla and in 5% in mandible.
• Most common feature of combination syndrome.
• However, Palmvist in 2003 reported that there was no evidence to
support that the bone resorption in the anterior maxilla is related to
the presence of anterior mandibular teeth.
• Other cause of flabby ridge are: unplanned or uncontrolled
extractions.
44
A review of prosthodontic management of fibrous ridges R. W. I. Crawford1 Br Dent J 2005;
199 : 715-19.

44. • The three mains approaches to the management of flabby ridges are:
1. The surgical removal of fibrous tissues.
2. fixed prosthesis - Implant retained prosthesis
3. Conventional removable prosthesis
A review of prosthodontic management of fibrous ridges R. W. I. Crawford1 Br Dent J 2005;
199 : 715-19.

45. Techniques :
 Hobkirk technique
 John D. Walter
 William H Filler technique
 Zafarulla Khan technique
 Controlled lateral pressure technique.
 Palatal splinting using two part tray system.
 Liddlelow technique’s.
 Allen & lynch technique.

46. • Hobkirk technique:
 The impression is made with heavy bodied silicone in a border
molded special tray.
 The heavy bodied material overlying the hypermobile tissue is
cut away and escape holes are made.
 A wash impression is then made with light bodied material.
• John D. Walter
 Recorded the healthy denture bearing tissue with zinc oxide
eugenol paste and the undisplaced fibrous tissue with
impression plaster.
47
A review of prosthodontic management of fibrous ridges R. W. I. Crawford1 Br Dent J 2005;
199 : 715-19.

47. WILLIAM H. FILLER
• Described a modified impression technique used in
patient with extremely hyperplastic residual ridges.
• It makes use of two trays where the second tray is
keyed over the first tray in its proper location.
• Light bodied Permlastic – first tray and Plastogum
– second tray and tray is seated in position.
• Two trays are held until the impression material
sets and impression is removed as a unit.
• Two trays are sealed together with sticky wax and
boxed in usual manner.
48
Prosthodontics rehabilitation of a maxillary fibrous ridge – a case report Dharmendra
Kumar Singh, TMU J. Dent :1(4 )Oct – Dec 2014

48. • ZAFRULLA KHAN TECHNIQUE
Primary impression is made and cast is poured
Impression plaster is brushed onto the flabby tissue
Excess material is trimmed to the outline of the apertures
Border molding is performed and wash impression is taken
Custom tray is fabricated leaving an aperture for flabby
tissues
Separating media is applied and master cast is made
Prosthodontics rehabilitation of a maxillary fibrous ridge – a case report Dharmendra Kumar Singh, TMU
J. Dent :1(4 )Oct – Dec 2014

49. • Advantages
Saves chair time,
Does not require the fabrication of two custom trays and
Enables visualization of the impression making of the
unsupported movable tissues.
50
Prosthodontics rehabilitation of a maxillary fibrous ridge – a case report Dharmendra Kumar Singh, TMU
J. Dent :1(4 )Oct – Dec 2014

50. PALATAL SPLINTING USING TWO PART TRAY SYSTEM
 Given by Osborne
 Involves two overlying trays used for recording maxillary displaceable
anterior tissues.
LIDDLELOW TECHNIQUE
 Two separate impression materials are used in custom trays , plaster of
Paris over flabby tissues, and zinc oxide eugenol over normal tissues.
51
A review of prosthodontic management of fibrous ridges R. W. I. Crawford1 Br Dent J
2005; 199 : 715-19.

51. Impression technique for
unfavourable mandibular ridges
• In such situations ,lack of ideal amount of supporting structures
decreases and the encroachment of the surrounding mobile tissues
into the denture border reduces both stability and retention.
• If the alternative methods like implants, bone grafting, vestibuloplasty
are not indicated ,one has to resort to conventional means.
• Aim of the impression –cover maximum area, obtain long
retromylohyoid flange and to maintain tongue position.
Indian dental academy; august 2013

52. • Techniques :
 3 stage impression technique
 Flange Technique
 Modified fluid wax technique
 Winkler’s Technique (Functional Reline)
 Miller’s Technique
 Shanahan Technique
 Roberto Von Kramer Technique
 Modified Fournet Tuller technique
 Mc Cord and Tyson Admixed Technique

53. • 3 STAGE IMPRESSION TECHNIQUE – ARTHUR S. FREESE
1. Preliminary impression
Oversized metal stock tray
Low heat modelling plastic is loaded
Pt is asked to do all border molding movements
Impression is boxed and poured in stone
J Prosthet Dent 1956;6(3):302–304

54. 2. Secondary impression
Acrylic tray is fabricated on this cast just short of outline
Wax stops are prepared in the molar region and anteriorly
stops are kept 3-4mm beyond the normal vertical dimension
Self cure acrylic resin is mixed and loaded on the tray
Pt is asked to bite and do all border molding movements
This tray is used for taking final impression
55
J Prosthet Dent 1956;6(3):302–304

55. 3. Final impression
Acrylic resin is allowed to harden
ZOE imp paste is mixed and loaded
Pt is asked to do same border molding movements
The imp is boxed, and a stone cast is poured
J Prosthet Dent 1956;6(3):302–304

56. FLANGE TECHNIQUE
• Frank Lott and Bernard Levin ( 1966 )
• Involves making impressions of the soft structures adjacent to
the buccal, lingual, labial surfaces and incorporating the
resulting extensions or flanges in denture.
• Fluid wax is rolled from the retromolar pad region to sublingual
region ,large enough to restore the areas of estimated resorption.
• Patient is asked to forcefully perform functional movements to
give a border extensions which covers maximum surface area.
57
Flange technique: an anatomic and physiologic approach to increased retention, function, comfort, and appearance
of dentures.Lott and levin: J Prosthet Dent 1966;13:394-413.

57. MODIFIED FLUID WAX TECHNIQUE
New technique : functional impression technique
It uses fluid wax –captures primary and secondary bearing area
without distortion of residual ridge.
It is indicated when:
When there is minimal bone height
Unfavourable residual ridge morphology
Unfavorable muscle attachment
Mucosa overlying is highly displaceable
58
Modified fluid wax impression for a severely resorbed edentulous mandibular ridge .
Tan et al .JPD 2009;101(4):279-82

58. 59
Modified fluid wax impression for a severely resorbed edentulous mandibular ridge :
Tan et al JPD 2009;101(4):279-82

59. • Advantages
It can be easily controlled to gain maximum coverage
It can be corrected readily.
Used to accurately determine the extent of muccobuccal
reflections.
Can be used to direct pressure to load bearing areas-buccal
shelf and slopes of ridge.
60
Modified fluid wax impression for a severely resorbed edentulous mandibular ridge .
Tan et al JPD 2009;101(4):279-82

60. Modified
impression
techniques
Admixed
Functional
Cocktail
All Green
Bhupender Yadav et al : Comparison of different final impression techniques for management of resorbed mandibular
ridge: A case report. Hindawi publishing corporation case reports in dentistry 2014: 1-6.

61. Admixed technique
• Mc Cord and Tyson in 1997
• Flat lower ridge with atrophic mucosa.
62
3 parts
red
7 parts
green
Final
impression
Bhupender Yadav et al : Comparison of different final impression techniques for management of resorbed mandibular ridge:
A case report. Hindawi publishing corporation case reports in dentistry 2014: 1-6.

62. Narrow, thread like residual ridges that is easily displaced in a lateral
direction on palpation.
63
J.Fraser McCord: Treatment of Edentulous patients, 1st edition,2004.

63. Functional impression technique
(Winkler Technique)
64
Overextended alginate primary
impression
Occlusal rims constructed
3 applications of tissue
conditioning material - 8-10 min
final wash – light body
impression material

64. 65
Bhupender Yadav et al : Comparison of different final impression techniques for management of resorbed mandibular
ridge: A case report. Hindawi publishing corporation case reports in dentistry 2014: 1-6.

65.  Functional movements such as puffing, blowing, whistling,
and smiling.
 Three applications of tissue conditioner material were done
at an interval of 8-10 minutes.
 Final impression was made with light body addition silicone
material.
66
Bhupender Yadav et al : Comparison of different final impression techniques for management of resorbed mandibular
ridge: A case report. Hindawi publishing corporation case reports in dentistry 2014: 1-6.

66. • Advantage - results in thick buccal, lingual, sublingual crescent
area borders.
• Miller used – mouth temperature waxes instead of tissue
conditioners
Indian dental academy august 20

67. Cocktail impression technique ( Praveen G. et al in
2011)
 Combination of admixed and functional technique
 McCord and Tyson’s technique - followed for definitive
impression.
 For recording the functional state, patient instructed to run
his tongue along his lips, suck in his cheeks, pull in his lips,
and swallow by keeping his mouth closed, as in closed
mouth impression technique, till the impression material
hardens.
68
Bhupender Yadav et al : Comparison of different final impression techniques for
management of resorbed mandibular ridge: A case report. Hindawi publishing corporation
case reports in dentistry 2014: 1-6.

68. Comparison of Different Final Impression Techniques for Management of
Resorbed Mandibular Ridge: A Case Report
BhupenderYadav, Manisha Jayna, Harish Yadav, Shrey Suri, Shefali Phogat,and Reshu Madan
CONVENTIONAL ALL GREEN
ADMIXED

69. COCKTAIL ELASTOMERIC
FUNCTIONAL
Mandibular denture made using functional
impression technique showed the highest
mean values of complete denture retention
whereas denture made using green stick
compound with oxide final wash showed
the lowest mean values of complete
denture retention.

70. A comparative evaluation of the retention of denture
bases fabricated using selective pressure , massad’s
and functional impression techniques: A clinical study.
• Aim – To evaluate retention of denture bases
fabricated using selective pressure, functional
and Massad’s impression techniques
• Result – Retention of denture bases obtained
from selective pressure impression technique
was best followed by Massad’s and functional
impression technique.
71
A comparative evaluation of the retention of denture bases fabricated using selective pressure
, massad’s and functional impression techniques: A clinical study: Journal of contemporary
dentistry 2014: 4(3):139-144

71. • Roberto Von Kramer
Used modeling compound to record the extension of the surface
without interfering the function of mastication and deglutition.
The active incorporation of tongue activity also stabilizes the
denture.
• Modified Fournet Tuller Technique
By ALLAN MACK
Utilizes the same principle of achieving the maximum peripheral
seal together with minimal pressure on the crest of the ridge to
obtain retention and stability.
72
Indian Dental Academy; august 2013

72. Klein Technique
Proposed the development of impression without a tray.
He used a moldable material (putty silicone), reinforced by an
internal metallic core, which was placed over the residual ridge and
the borders molded by speech exercises.
A low viscosity material is placed on the impression surface of this
tray and a functional preliminary impression is made.
• Shanahan Technique
He said that training the patient to achieve an ideal tongue position
helps to attain an effective lingual border seal.
73
Indian Dental Academy; august 2013

73. Patients with Microstomia
74

74. • Majority of limited mouth opening patients can be treated by
–exercise
• But if no response than prosthetic treatment procedures has
to be manipulated especially impressions.
• Walter described a technique with the use of sectional stock
trays. Impressions of each side of the jaw was made on at a
time and two half were joined and cast was poured.
75
Impression trays designs and techniques for complete dentures in cases of microstomia:
A review:Chethan hegde. journal of Prosthodontic Research. 2012; 56(2): 142

75. • ROBERT LEUBKE et al (JPD 1984;52:135-7)
Used LEGO plastic blocks to prepare sectional stock trays.
• ANSGAR CHENG
Used key and keyway attachment to prepare sectional custom
trays.
• ONUR GECKILL
Prepared tray in two parts(anterior and posterior) – oriented by 3
vertically placed metal bars.
76
Impression trays designs and techniques for complete dentures in cases of
microstomia: A review:Chethan hegde. journal of Prosthodontic Research. 2012; 56(2):
142

76. What is the evidence base for the efficacies of different
complete denture impression procedures? A critical
review - Gunnar E. Carlsson et al
• There was no support for the frequent textbook statement
that the two-step procedure is necessary and superior to the
one-step method.
• While some special clinical situations may benefit from other
combinations of materials and techniques, the results suggest
that the simple and inexpensive one-step procedure can serve
the needs of the majority of edentulous patients.
• Clinical significance: In spite of the fact that two-step
procedures for complete denture impressions dominate
textbooks, teaching and specialist practice, the results of this
review suggest that a simple and inexpensive one-step
procedure can serve the needs of the majority of edentulous
patients.
77

77. CONCLUSION
• Success of complete dentures largely depends on
accuracy of impression.
• Accurate impression needs a thorough understanding of
anatomy, physiology of supporting structures, properties
and manipulation of materials.
• Based on the particular condition, dentist needs to select
material and technique of impression for success of
complete denture therapy.