SlideShare a Scribd company logo
DIE AND DIE SYSYTEM
Dr.shiva sai vemula
1st year MDS
Dept.of PROSTHODONTICS
1
CONTENTS
• DIE:-
• INTRODUCTION
• TERMINOLOGY
• CLASSIFICATION
• IDEAL PROPORTIES
• DIE (HARDNER,SPACER AND LUBRICANT)
• DIE SYSYTEM:-
• CLASSIFICATION
• DI LOC TRAY SYSTEM
• PINDEX SYSTEM
• DVA SYSTEM
• ZEISER MODEL SYSTEM
• MONOTRAC ARTICULATION SYSTEM
• DIE PINS 2
Direct fabrication of extra coronal restoration in the
mouth is inconvenient, difficult, time consuming and
virtually impossible. A cast and die system captures
the necessary information so that can be transferred
to the laboratory.
An accurate working cast with removable dies is
essential to make a well fitting restoration.
INTRODUCTION
3
Die :- It is the positive reproduction of the form of
the prepared tooth in any suitable substance.
Cast :- A life-size likeness of some desired form. It
is formed within or is a material poured into a
matrix or impression of the desired form
Dowel pin:- A metal pin used in stone casts to
remove die sections and replace them accurately
in the original position
4
MATERIALS USED FOR
MAKING DIES
NON
METALLIC
METALLIC
• Gypsum materials
• Cements(Silicophospate cement)
• Refractory die materials
• Polymers (epoxy resin, polyurethane)
• Electroformed dies
• Amalgam
• Sprayed metals
5
6
Hydrocal
Densite
Crystocol
impression
Ideal properties
• It should be dimensionally accurate.
• It should have high abrasion resistance and smooth
surface.
• Toughness:- it should resist to breakage (burnishing
foil)
• Ability to reproduce all the fine details in the
impression.
• Compatibility with all the impression material.
• Easy and quick manipulation and rapid fabrication.
• Non toxic.
• Ecominical
7
ADA TYPE 4
stone
•Dimensional
accuracy Most
situations
Accurate
proportioning
Eessential
• Straight
forward
Technique
• Low cost
Low abrasion
resistance
ADA TYPE 5
stone
•Straight
forward
technique
Increased
expansion
Base metal
alloy
situations
Accurate
proportioning
essential
• Low cost
•Improved
strength than
type4
Materials Advantages Disadvantage Use Precaution
8
NON METALLIC
Materials Advantages Disadvantage Use Precaution
Electroplating High strength
Good abrasion
resistance
•Time
consuming
Complete
ceramic
crowns
•Silver uses
toxic cyanide
•Incompatible
with many
impression
materials
Amalgam •High strength
•Good abrasion
resistance
• low setting
time
• high thermal
conductivity(
wax pattren
will cools
fast-
distertion)
Complete
ceramic
crowns
9
METALLIC
A low viscosity
polyvinyl siloxane
duplicating
material is used to
reproduce dies
Adapt a strip of
putty around the
prepared teeth on
working cast and
dies to limit the flow
of mold material.
RefractoryDies:-
These are made for preparation of all ceramic restorations.
Advantages – Excellent marginal adaptation
10
• The duplication material should be at least 3.00mm thick and it
should extend 3 mm beyond incisal edges of teeth to provide
adequate support refractory material.
• The duplicating material is allowed to set for about 30 minutes.
• The master dies removed
from cast and duplicating
material.
By applying pressure on
base of tray, master cast is
loosened with duplicating
material intact.
11
Allow the refractory
dies set for about 1-2
hours.
The refractory material
is poured and vibrated in
the area of missing dies.
12
Die Hardener
• Materials applied on the surface of die to
increase the surface hardness.
• Should have low viscosity
• Commonly used materials as die
hardeners:
 Cyanoacrylate resins (Eg: Premabond)
 Acrylic resin lacquer (Eg: Die Prep die hardener)
• Optimal Thickness  2-3 mm, but if not properly
manipulated10 mm
13
Die Spacer :-
An agent applied to a die to provide space for the
luting agent in the finished casting.
Types of die spacers :
• Resins
• Paint or liquids
• Model paint
• Coloured nail polish
• Thermoplastic resins dissolved in volatile solvents.
14
Should be applied
0.5-1mm short of margin
Brush strokes in one direction
Wait for 2 mins before
applying next coat
• W.V.Campagni et al (JPD 1986;55;324) concluded that grooves did
not disrupt seating when die spacer application was specifically
omitted from grooves
• Optimal thickness:-20-40 micro meter
15
die lub
Die Separator
The lubricants or die separators which can be used to
prevent wax from adhering to stone are oils, liquid soap,
detergents and a number of commercially available
preparations.
16
Cast & Die
Systems
17
Die systems
Working cast
with separate
die
Working cast
with
removable die
Without die
pins
With die pins
Pre pour
technique
Post pour
technique
18
Working cast with separate die
Method of
Simplest
fabrication
between
Advantages:
• Easy to fabricate
Keeps relation
abutments fixed.
• Better contours and
emergence profile while
wax pattern fabrication. 19
Disadvantages:-
Wax pattern must be transferred from die to cast 
destroy internal adaptation of wax
Some times difficult to seat wax pattern on the cast
- Different impressions
- Second pour –impression damaged
- Different thickness of spacers
Procedure:-
Both working cast and sectional die can be obtained by:
- Pouring impression twice
- Making two impressions 20
Trim sectional cast
Octagonal in shape
Sides parallel or slightly
taper towards base
Handle 1 inch long
Pear shaped acrylic bur
 trimmed apical to finish line
21
Contour be approximately like root 
To facilitate good axial contours in
restoration
Philippe A. et al (IJP 1993:6;533) compared 2 removable die systems
(Zeiser system (Girrbach Dental), Pindex (Coltene-Whaledent) and
working cast with separate die. They concluded that the Zeiser system
was the most accurate of the three systems studied, followed by
working cast with separate die.
22
WORKING CAST WITH REMOVABLE DIE
Advantage:
Convenient to use
Various drawback of separate die are
overcome
Disadvantage:
Risk of introducing error in the
pattern if die does not seat accurately
in the working cast
23
Requirements:
1) Dies must return to their exact original position
2) Dies must remain stable even when inverted
3)Cast containing dies must be easy to mount on an articulator
24
WORKING CAST WITH REMOVABLE DIE
working cast with die pins preformed plastic trays
working cast without die pins
25
Pre pour technique
Devices are oriented in
the impression before it
is poured
Post pour technique
Attached to the underside
of the cast that has already
been poured
Systems using die pins
26
Pre pour technique
27
Procedure
Positioning of dowel pins
A) Marking to act
as guide in
placement of pins
Mann paralleling instrument
Clamps holding
Dowel pins
B)
28
C) Disposable anesthetic needles
D) Straight pins with
modeling clay
E) Matchsticks
F) Bobby pins
29
Die stone impression poured into filling the of teeth and
covering the knurled end of the dowel pin
V- shaped orientation
grooves made
Separating media-area
adjacent to each dowel pin
Small wax ball placed
on tip of each dowel
30
31
Using metal strips
Thin metal strips (0.001 gauge) were
carefully wedged in the impression
Placement and tapering
of matrix band
Matrix band kept parallel
in case of multiple
preparations
2 mm of band exposed
32
Post pour techniques
33
Di lok tray system
34
Snap apart plastic tray with internal orienting
grooves and notches to reassemble the working
cast and die.
Before using check for
space in articulator
Cast poured1inch
height
Trim to fit Di lok tray
35
Fill tray ¾ with stone
Seat the cast  cervical area
of teeth be about 4mm above
the edge of tray
Disassemble the
tray 36
37
PINDEX SYSTEM
(Coltene / Whaledent)
Light beam
director
Work table
Drill hole
Handle bar
Motor housing
38
Bottom should be flat to ensure that the
Pins will be parallel Faciolingual width – 20 mm
Two pins for each die
Two for each pontic area
One /Two pins in each terminal
segment containing unprepared
teeth
39
40
Shorter pins on lingual side
Longer on buccal side makes the ends of the dowel pins
more accessible for easy removal after the casts are mounted.
Ends of shorter sleeves  place wax
41
42
DVA System
(dental ventures of america)
Pre manufactured base system
43
Marking dowel pin locations On clear
plate with twin tip marker
Impression on alignment fixture
Secured with putty
Drill holes for dowel pins
Using drilling press
44
Insert dowel pins Impression is poured and stone
is placed around dowel pin
Alignment fixture is replaced over
poured impression
Set cast is removed from
baseplate with gentle tapping
45
Cast is trimmed Cast is sectioned
Definitive cast trimmed with
DVA model system 46
47
Zeiser model
system
48
Impression leveled, blocked out
with silicone putty
positioned over the base
Pin locations determined Pin holes drilled in base
49
Pins inserted into base Impression is poured
Base inverted The cast is separated
from the impression 50
Monotrac Articulation
Vertical single pour base (VSP) Pour stone
Spray silicone spray on VSP
Cones.
Separator on stone
51
Trim impression –fit the
base molds
Pin –act as guide for placement
52
Remove base mold
and impression
VSP base removed by tapping
53
54
Conventional dowel pin systems
Dowel pin (GPT 8): a metal pin used in stone
casts to remove die sections and replace them
accurately in the original position
Straight Curved
55
Straight dowel pins
Flat sided
dowel
Double straight
dowel with
common head
(Bi pin)
Rounded single
dowel pin
BI-PIN with case
BI-FIXED-pin
Doubles straight dowel
with fixing wire for
accurate positioning
in impression 56
57
REFRENCES
• Anusavice K.J.-“Phillips’Science of Dental materials” 11th edition ,
2003
• Craig’s R.G., Powers J.M. – “Restorative Dental Materials”
11thedition, 2002
• RosenstielS.F., Land M.F.–“Contemporary fixe prosthodontics”
3rd edi. 2001.
• Rudd K.D., Morrow R.M. – “Dental laboratory procedures” FPD
2nd edi, 1986.
• Shillingburg H.T. – “Fundamentals of fixed Prosthodontics.”3rd
edition
• Juan Glen Serrano, Xavier Lepe, John D. Townsend, Glen H. Johnson,
Stephen Thielke-An accuracy evaluation of four removable die
systems-J Prosthet Dent 1998;80:575-86.
• C, Douglass Smith,Arun Nayyar, David L. Koth-Fabrication of
removable dies using cemented dowel pins J Prosthet Dent:
1992:68:372-4
Thank you
58

More Related Content

What's hot

Heat cure acrylic
Heat cure acrylicHeat cure acrylic
Heat cure acrylic
Aamir Godil
 
Laboratory procedures in rpd- Kelly
Laboratory procedures in rpd- KellyLaboratory procedures in rpd- Kelly
Laboratory procedures in rpd- Kelly
Kelly Norton
 
Casting procedures
Casting proceduresCasting procedures
Casting procedures
Dr. KRITI TREHAN
 
Denture base materials
Denture base materialsDenture base materials
Denture base materials
NeerajaMenon4
 
Tissue conditioners
Tissue conditionersTissue conditioners
Tissue conditioners
ChaithraPrabhu3
 
Spacer designs
Spacer designsSpacer designs
Spacer designs
Dr. Shannon Fernandes
 
Denture base materials
Denture base materials Denture base materials
Denture base materials
Dr. Vishal Gohil
 
Impression techniques in fpd
Impression techniques in fpdImpression techniques in fpd
Impression techniques in fpd
Apurva Thampi
 
Cast restorations
Cast restorationsCast restorations
Cast restorations
Deepthi P Ramachandran
 
8.working casts and dies
8.working casts and dies8.working casts and dies
8.working casts and dies
Lama K Banna
 
10. posterior teeth arrangement
10. posterior teeth arrangement10. posterior teeth arrangement
10. posterior teeth arrangement
shammasm
 
posterior palatal seal ppt
posterior palatal seal pptposterior palatal seal ppt
posterior palatal seal ppt
Preeti Kalia
 
Impression Materials (Dental)
Impression Materials (Dental) Impression Materials (Dental)
Impression Materials (Dental)
Dr. Md. Arifur Rahman
 
Impression techniques in rpd
Impression techniques in rpdImpression techniques in rpd
Impression techniques in rpd
Apurva Thampi
 
Tooth preparation for Metal ceramic crowns.
Tooth preparation for Metal ceramic crowns.Tooth preparation for Metal ceramic crowns.
Tooth preparation for Metal ceramic crowns.
srinivaslalluri
 
Wax patterns in fpd/ dental crown & bridge courses
Wax patterns in fpd/ dental crown & bridge coursesWax patterns in fpd/ dental crown & bridge courses
Wax patterns in fpd/ dental crown & bridge courses
Indian dental academy
 
7.maxillofacial materials.ppt.pptx read
7.maxillofacial materials.ppt.pptx read7.maxillofacial materials.ppt.pptx read
7.maxillofacial materials.ppt.pptx read
dr zarir ruttonji
 
Impression materials and techniques
Impression materials and techniquesImpression materials and techniques
Impression materials and techniques
Ekta Garg
 
Casting defects in dentistry
Casting defects in dentistry Casting defects in dentistry
Casting defects in dentistry
DrAnuprabha Shrivastav
 
ZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptx
ZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptxZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptx
ZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptx
Royal Dental College Library
 

What's hot (20)

Heat cure acrylic
Heat cure acrylicHeat cure acrylic
Heat cure acrylic
 
Laboratory procedures in rpd- Kelly
Laboratory procedures in rpd- KellyLaboratory procedures in rpd- Kelly
Laboratory procedures in rpd- Kelly
 
Casting procedures
Casting proceduresCasting procedures
Casting procedures
 
Denture base materials
Denture base materialsDenture base materials
Denture base materials
 
Tissue conditioners
Tissue conditionersTissue conditioners
Tissue conditioners
 
Spacer designs
Spacer designsSpacer designs
Spacer designs
 
Denture base materials
Denture base materials Denture base materials
Denture base materials
 
Impression techniques in fpd
Impression techniques in fpdImpression techniques in fpd
Impression techniques in fpd
 
Cast restorations
Cast restorationsCast restorations
Cast restorations
 
8.working casts and dies
8.working casts and dies8.working casts and dies
8.working casts and dies
 
10. posterior teeth arrangement
10. posterior teeth arrangement10. posterior teeth arrangement
10. posterior teeth arrangement
 
posterior palatal seal ppt
posterior palatal seal pptposterior palatal seal ppt
posterior palatal seal ppt
 
Impression Materials (Dental)
Impression Materials (Dental) Impression Materials (Dental)
Impression Materials (Dental)
 
Impression techniques in rpd
Impression techniques in rpdImpression techniques in rpd
Impression techniques in rpd
 
Tooth preparation for Metal ceramic crowns.
Tooth preparation for Metal ceramic crowns.Tooth preparation for Metal ceramic crowns.
Tooth preparation for Metal ceramic crowns.
 
Wax patterns in fpd/ dental crown & bridge courses
Wax patterns in fpd/ dental crown & bridge coursesWax patterns in fpd/ dental crown & bridge courses
Wax patterns in fpd/ dental crown & bridge courses
 
7.maxillofacial materials.ppt.pptx read
7.maxillofacial materials.ppt.pptx read7.maxillofacial materials.ppt.pptx read
7.maxillofacial materials.ppt.pptx read
 
Impression materials and techniques
Impression materials and techniquesImpression materials and techniques
Impression materials and techniques
 
Casting defects in dentistry
Casting defects in dentistry Casting defects in dentistry
Casting defects in dentistry
 
ZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptx
ZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptxZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptx
ZINC OXIDE EUGENOL IMPRESSION PASTE (1).pptx
 

Similar to Die materials and sysytem

Working cast [Autosaved] - Copy.pptx
Working cast [Autosaved] - Copy.pptxWorking cast [Autosaved] - Copy.pptx
Working cast [Autosaved] - Copy.pptx
Dr.shiva sai vemula
 
working casts and dies.ppt
working casts and dies.pptworking casts and dies.ppt
working casts and dies.ppt
Shrimant Raman
 
CASTING PROCEDURES AND DEFECTS
CASTING PROCEDURES AND DEFECTSCASTING PROCEDURES AND DEFECTS
CASTING PROCEDURES AND DEFECTS
Dr. Aadil Thimwala
 
shlinberg casts and die 87-9-5
shlinberg casts and die 87-9-5shlinberg casts and die 87-9-5
shlinberg casts and die 87-9-5
Private Office
 
Mp iii lab
Mp iii labMp iii lab
Mp iii lab
Sathia Prathap
 
Lab steps of partial denture framework construction
Lab steps of partial denture framework construction Lab steps of partial denture framework construction
Lab steps of partial denture framework construction
eslam gomaa
 
Working casts and dies
Working casts and diesWorking casts and dies
Working casts and dies
Lama K Banna
 
Casting procedure
Casting procedure Casting procedure
Casting procedure
Dr Sumaya Saleem
 
Lab procedures in fabrication of CPD- Dr Prathibha
Lab procedures in fabrication of CPD- Dr PrathibhaLab procedures in fabrication of CPD- Dr Prathibha
Lab procedures in fabrication of CPD- Dr Prathibha
Dr Prathibha Prasad
 
Casting procedures
Casting procedures Casting procedures
Casting procedures
Abhijeet Pallewar
 
Introduction to Casting
Introduction to CastingIntroduction to Casting
Introduction to Casting
Thulasikanth Vaddi
 
Casting procedure
Casting procedure Casting procedure
Casting procedure
tv89615
 
1 introduction of casting
1 introduction of casting1 introduction of casting
1 introduction of casting
pavankumar chunduru
 
Definitive casts and dies
Definitive casts and diesDefinitive casts and dies
Definitive casts and dies
hesham1964
 
Casting Procedures & Casting Defects in Dentistry
Casting Procedures & Casting Defects in DentistryCasting Procedures & Casting Defects in Dentistry
Casting Procedures & Casting Defects in Dentistry
Jehan Dordi
 
Impression Techniques in Fixed partial denture
Impression Techniques in Fixed partial dentureImpression Techniques in Fixed partial denture
Impression Techniques in Fixed partial denture
Dr.Richa Sahai
 
indirect bonding
indirect bondingindirect bonding
indirect bonding
Kumar Adarsh
 
Polymer investment molding modified
Polymer investment molding modifiedPolymer investment molding modified
Polymer investment molding modified
arun kumar
 
DIE PREPARATION AND DIE SYSTEMS.pptx
DIE PREPARATION   AND   DIE SYSTEMS.pptxDIE PREPARATION   AND   DIE SYSTEMS.pptx
DIE PREPARATION AND DIE SYSTEMS.pptx
SatvikaPrasad
 
Working cast &die shams new1
Working cast &die shams  new1Working cast &die shams  new1
Working cast &die shams new1
nudii
 

Similar to Die materials and sysytem (20)

Working cast [Autosaved] - Copy.pptx
Working cast [Autosaved] - Copy.pptxWorking cast [Autosaved] - Copy.pptx
Working cast [Autosaved] - Copy.pptx
 
working casts and dies.ppt
working casts and dies.pptworking casts and dies.ppt
working casts and dies.ppt
 
CASTING PROCEDURES AND DEFECTS
CASTING PROCEDURES AND DEFECTSCASTING PROCEDURES AND DEFECTS
CASTING PROCEDURES AND DEFECTS
 
shlinberg casts and die 87-9-5
shlinberg casts and die 87-9-5shlinberg casts and die 87-9-5
shlinberg casts and die 87-9-5
 
Mp iii lab
Mp iii labMp iii lab
Mp iii lab
 
Lab steps of partial denture framework construction
Lab steps of partial denture framework construction Lab steps of partial denture framework construction
Lab steps of partial denture framework construction
 
Working casts and dies
Working casts and diesWorking casts and dies
Working casts and dies
 
Casting procedure
Casting procedure Casting procedure
Casting procedure
 
Lab procedures in fabrication of CPD- Dr Prathibha
Lab procedures in fabrication of CPD- Dr PrathibhaLab procedures in fabrication of CPD- Dr Prathibha
Lab procedures in fabrication of CPD- Dr Prathibha
 
Casting procedures
Casting procedures Casting procedures
Casting procedures
 
Introduction to Casting
Introduction to CastingIntroduction to Casting
Introduction to Casting
 
Casting procedure
Casting procedure Casting procedure
Casting procedure
 
1 introduction of casting
1 introduction of casting1 introduction of casting
1 introduction of casting
 
Definitive casts and dies
Definitive casts and diesDefinitive casts and dies
Definitive casts and dies
 
Casting Procedures & Casting Defects in Dentistry
Casting Procedures & Casting Defects in DentistryCasting Procedures & Casting Defects in Dentistry
Casting Procedures & Casting Defects in Dentistry
 
Impression Techniques in Fixed partial denture
Impression Techniques in Fixed partial dentureImpression Techniques in Fixed partial denture
Impression Techniques in Fixed partial denture
 
indirect bonding
indirect bondingindirect bonding
indirect bonding
 
Polymer investment molding modified
Polymer investment molding modifiedPolymer investment molding modified
Polymer investment molding modified
 
DIE PREPARATION AND DIE SYSTEMS.pptx
DIE PREPARATION   AND   DIE SYSTEMS.pptxDIE PREPARATION   AND   DIE SYSTEMS.pptx
DIE PREPARATION AND DIE SYSTEMS.pptx
 
Working cast &die shams new1
Working cast &die shams  new1Working cast &die shams  new1
Working cast &die shams new1
 

More from Dr.shiva sai vemula

Denture base resins materials and its mechanism of action
Denture base resins materials and its mechanism of actionDenture base resins materials and its mechanism of action
Denture base resins materials and its mechanism of action
Dr.shiva sai vemula
 
Balanced Occlusion And It's Concepts: Complete Denture
Balanced Occlusion And It's Concepts: Complete DentureBalanced Occlusion And It's Concepts: Complete Denture
Balanced Occlusion And It's Concepts: Complete Denture
Dr.shiva sai vemula
 
Impression Materials Part - 3 - Dental Materials
Impression Materials Part - 3 - Dental MaterialsImpression Materials Part - 3 - Dental Materials
Impression Materials Part - 3 - Dental Materials
Dr.shiva sai vemula
 
Impression materials 2.pptx
Impression materials 2.pptxImpression materials 2.pptx
Impression materials 2.pptx
Dr.shiva sai vemula
 
Impression Materials Part - 1
Impression Materials Part - 1Impression Materials Part - 1
Impression Materials Part - 1
Dr.shiva sai vemula
 
GYPSUM PART 2.pptx
GYPSUM PART 2.pptxGYPSUM PART 2.pptx
GYPSUM PART 2.pptx
Dr.shiva sai vemula
 
Gypsum products part -1
Gypsum products part -1Gypsum products part -1
Gypsum products part -1
Dr.shiva sai vemula
 
Physical and Chemical Properties of Dental Materials part - 2.pptx
Physical and Chemical Properties of Dental Materials part - 2.pptxPhysical and Chemical Properties of Dental Materials part - 2.pptx
Physical and Chemical Properties of Dental Materials part - 2.pptx
Dr.shiva sai vemula
 
Physical and Chemical Properties of Dental Materials part - 1
Physical and Chemical Properties of Dental Materials part - 1Physical and Chemical Properties of Dental Materials part - 1
Physical and Chemical Properties of Dental Materials part - 1
Dr.shiva sai vemula
 
anatomical landmarks [Autosaved].pptx
anatomical landmarks [Autosaved].pptxanatomical landmarks [Autosaved].pptx
anatomical landmarks [Autosaved].pptx
Dr.shiva sai vemula
 
Structure of matter.pptx
Structure of matter.pptxStructure of matter.pptx
Structure of matter.pptx
Dr.shiva sai vemula
 
Pcp spotters.pptx
Pcp spotters.pptxPcp spotters.pptx
Pcp spotters.pptx
Dr.shiva sai vemula
 
Impression procedure for distal extension RPD.pptx
Impression procedure for distal extension RPD.pptxImpression procedure for distal extension RPD.pptx
Impression procedure for distal extension RPD.pptx
Dr.shiva sai vemula
 
Denture processing.pptx
Denture processing.pptxDenture processing.pptx
Denture processing.pptx
Dr.shiva sai vemula
 
Denture adhesives &liners.pptx
Denture adhesives &liners.pptxDenture adhesives &liners.pptx
Denture adhesives &liners.pptx
Dr.shiva sai vemula
 
Implant failure & its management.pptx
Implant failure & its management.pptxImplant failure & its management.pptx
Implant failure & its management.pptx
Dr.shiva sai vemula
 
Gingival retraction.pptx
Gingival retraction.pptxGingival retraction.pptx
Gingival retraction.pptx
Dr.shiva sai vemula
 
Dental Ceramics
Dental Ceramics Dental Ceramics
Dental Ceramics
Dr.shiva sai vemula
 
Gypsum and its products
Gypsum and its productsGypsum and its products
Gypsum and its products
Dr.shiva sai vemula
 

More from Dr.shiva sai vemula (19)

Denture base resins materials and its mechanism of action
Denture base resins materials and its mechanism of actionDenture base resins materials and its mechanism of action
Denture base resins materials and its mechanism of action
 
Balanced Occlusion And It's Concepts: Complete Denture
Balanced Occlusion And It's Concepts: Complete DentureBalanced Occlusion And It's Concepts: Complete Denture
Balanced Occlusion And It's Concepts: Complete Denture
 
Impression Materials Part - 3 - Dental Materials
Impression Materials Part - 3 - Dental MaterialsImpression Materials Part - 3 - Dental Materials
Impression Materials Part - 3 - Dental Materials
 
Impression materials 2.pptx
Impression materials 2.pptxImpression materials 2.pptx
Impression materials 2.pptx
 
Impression Materials Part - 1
Impression Materials Part - 1Impression Materials Part - 1
Impression Materials Part - 1
 
GYPSUM PART 2.pptx
GYPSUM PART 2.pptxGYPSUM PART 2.pptx
GYPSUM PART 2.pptx
 
Gypsum products part -1
Gypsum products part -1Gypsum products part -1
Gypsum products part -1
 
Physical and Chemical Properties of Dental Materials part - 2.pptx
Physical and Chemical Properties of Dental Materials part - 2.pptxPhysical and Chemical Properties of Dental Materials part - 2.pptx
Physical and Chemical Properties of Dental Materials part - 2.pptx
 
Physical and Chemical Properties of Dental Materials part - 1
Physical and Chemical Properties of Dental Materials part - 1Physical and Chemical Properties of Dental Materials part - 1
Physical and Chemical Properties of Dental Materials part - 1
 
anatomical landmarks [Autosaved].pptx
anatomical landmarks [Autosaved].pptxanatomical landmarks [Autosaved].pptx
anatomical landmarks [Autosaved].pptx
 
Structure of matter.pptx
Structure of matter.pptxStructure of matter.pptx
Structure of matter.pptx
 
Pcp spotters.pptx
Pcp spotters.pptxPcp spotters.pptx
Pcp spotters.pptx
 
Impression procedure for distal extension RPD.pptx
Impression procedure for distal extension RPD.pptxImpression procedure for distal extension RPD.pptx
Impression procedure for distal extension RPD.pptx
 
Denture processing.pptx
Denture processing.pptxDenture processing.pptx
Denture processing.pptx
 
Denture adhesives &liners.pptx
Denture adhesives &liners.pptxDenture adhesives &liners.pptx
Denture adhesives &liners.pptx
 
Implant failure & its management.pptx
Implant failure & its management.pptxImplant failure & its management.pptx
Implant failure & its management.pptx
 
Gingival retraction.pptx
Gingival retraction.pptxGingival retraction.pptx
Gingival retraction.pptx
 
Dental Ceramics
Dental Ceramics Dental Ceramics
Dental Ceramics
 
Gypsum and its products
Gypsum and its productsGypsum and its products
Gypsum and its products
 

Recently uploaded

Girls Call Pune 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Pune 000XX00000 Provide Best And Top Girl Service And No1 in CityGirls Call Pune 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Pune 000XX00000 Provide Best And Top Girl Service And No1 in City
brindaarora0
 
Girls call Service Kolkata 000XX00000 Provide Best And Top Girl Service And N...
Girls call Service Kolkata 000XX00000 Provide Best And Top Girl Service And N...Girls call Service Kolkata 000XX00000 Provide Best And Top Girl Service And N...
Girls call Service Kolkata 000XX00000 Provide Best And Top Girl Service And N...
bobhany3646
 
LBS Cert degree offer diploma
LBS Cert degree offer diploma LBS Cert degree offer diploma
LBS Cert degree offer diploma
kyted
 
💥PARADISE LOST ELEPHANT FOLIO🇺🇸👁️ Wikipedia Folio (Creative Commons) 💥PARADIS...
💥PARADISE LOST ELEPHANT FOLIO🇺🇸👁️ Wikipedia Folio (Creative Commons) 💥PARADIS...💥PARADISE LOST ELEPHANT FOLIO🇺🇸👁️ Wikipedia Folio (Creative Commons) 💥PARADIS...
💥PARADISE LOST ELEPHANT FOLIO🇺🇸👁️ Wikipedia Folio (Creative Commons) 💥PARADIS...
BBaez1
 
Copy of Copy of Black Modern Minimalist Presentation (5).pdf
Copy of Copy of Black Modern Minimalist Presentation (5).pdfCopy of Copy of Black Modern Minimalist Presentation (5).pdf
Copy of Copy of Black Modern Minimalist Presentation (5).pdf
bilalpakweb
 
Girls Call Dehradun 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Dehradun 000XX00000 Provide Best And Top Girl Service And No1 in CityGirls Call Dehradun 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Dehradun 000XX00000 Provide Best And Top Girl Service And No1 in City
dalmeetsingh09090
 
High Profile Girls Call Vadodara 🎈🔥000XX00000 🔥💋🎈 Provide Best And Top Girl S...
High Profile Girls Call Vadodara 🎈🔥000XX00000 🔥💋🎈 Provide Best And Top Girl S...High Profile Girls Call Vadodara 🎈🔥000XX00000 🔥💋🎈 Provide Best And Top Girl S...
High Profile Girls Call Vadodara 🎈🔥000XX00000 🔥💋🎈 Provide Best And Top Girl S...
dimplekumaridk322
 
Girls Call Mysore 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Mysore 000XX00000 Provide Best And Top Girl Service And No1 in CityGirls Call Mysore 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Mysore 000XX00000 Provide Best And Top Girl Service And No1 in City
parulpk4011
 
🚂🚘 Premium Girls Call Bhubaneswar 🛵🚡000XX00000 💃 Choose Best And Top Girl Se...
🚂🚘 Premium Girls Call Bhubaneswar  🛵🚡000XX00000 💃 Choose Best And Top Girl Se...🚂🚘 Premium Girls Call Bhubaneswar  🛵🚡000XX00000 💃 Choose Best And Top Girl Se...
🚂🚘 Premium Girls Call Bhubaneswar 🛵🚡000XX00000 💃 Choose Best And Top Girl Se...
bhupeshkumar0889
 
IC degree offer diploma Transcript
IC degree offer diploma TranscriptIC degree offer diploma Transcript
IC degree offer diploma Transcript
bybze
 
Lecture 4 - Rose.pptx rose under protected cultivation
Lecture 4 - Rose.pptx rose under protected cultivationLecture 4 - Rose.pptx rose under protected cultivation
Lecture 4 - Rose.pptx rose under protected cultivation
impanaimpana831
 
DIAPOSITIVAS ENRIQUE IGLESIASbibliografia.pptx
DIAPOSITIVAS ENRIQUE IGLESIASbibliografia.pptxDIAPOSITIVAS ENRIQUE IGLESIASbibliografia.pptx
DIAPOSITIVAS ENRIQUE IGLESIASbibliografia.pptx
NoahPaz1
 
Girls Call Mumbai 9910780858 Provide Best And Top Girl Service And No1 in City
Girls Call Mumbai 9910780858 Provide Best And Top Girl Service And No1 in CityGirls Call Mumbai 9910780858 Provide Best And Top Girl Service And No1 in City
Girls Call Mumbai 9910780858 Provide Best And Top Girl Service And No1 in City
44annissa
 
AWS Architecture Icons - Dark mode. Use AWS icons today!
AWS Architecture Icons - Dark mode. Use AWS icons today!AWS Architecture Icons - Dark mode. Use AWS icons today!
AWS Architecture Icons - Dark mode. Use AWS icons today!
ssuserfb6acb
 
THE QUESTION NIGERIA AND OTHER COLLECTIONS (WORD) 2.docx
THE QUESTION NIGERIA AND OTHER COLLECTIONS (WORD) 2.docxTHE QUESTION NIGERIA AND OTHER COLLECTIONS (WORD) 2.docx
THE QUESTION NIGERIA AND OTHER COLLECTIONS (WORD) 2.docx
PstSanitarianWalsonP
 
New Girls Call Mumbai 9920725232 Unlimited Short Providing Girls Service Avai...
New Girls Call Mumbai 9920725232 Unlimited Short Providing Girls Service Avai...New Girls Call Mumbai 9920725232 Unlimited Short Providing Girls Service Avai...
New Girls Call Mumbai 9920725232 Unlimited Short Providing Girls Service Avai...
45unexpected
 
Why We Love Visiting Art Galleries?
Why We Love Visiting Art Galleries?Why We Love Visiting Art Galleries?
Why We Love Visiting Art Galleries?
connectcontemporary
 
SDSU degree offer diploma Transcript
SDSU degree offer diploma TranscriptSDSU degree offer diploma Transcript
SDSU degree offer diploma Transcript
bybze
 
in Dubai Online contact "+971)555095267 " to buy abortion pills in Dubai, Abu...
in Dubai Online contact "+971)555095267 " to buy abortion pills in Dubai, Abu...in Dubai Online contact "+971)555095267 " to buy abortion pills in Dubai, Abu...
in Dubai Online contact "+971)555095267 " to buy abortion pills in Dubai, Abu...
kylerkelson6767
 
Pune Girls call Service 000XX00000 Provide Best And Top Girl Service And No1 ...
Pune Girls call Service 000XX00000 Provide Best And Top Girl Service And No1 ...Pune Girls call Service 000XX00000 Provide Best And Top Girl Service And No1 ...
Pune Girls call Service 000XX00000 Provide Best And Top Girl Service And No1 ...
bhumivarma35300
 

Recently uploaded (20)

Girls Call Pune 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Pune 000XX00000 Provide Best And Top Girl Service And No1 in CityGirls Call Pune 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Pune 000XX00000 Provide Best And Top Girl Service And No1 in City
 
Girls call Service Kolkata 000XX00000 Provide Best And Top Girl Service And N...
Girls call Service Kolkata 000XX00000 Provide Best And Top Girl Service And N...Girls call Service Kolkata 000XX00000 Provide Best And Top Girl Service And N...
Girls call Service Kolkata 000XX00000 Provide Best And Top Girl Service And N...
 
LBS Cert degree offer diploma
LBS Cert degree offer diploma LBS Cert degree offer diploma
LBS Cert degree offer diploma
 
💥PARADISE LOST ELEPHANT FOLIO🇺🇸👁️ Wikipedia Folio (Creative Commons) 💥PARADIS...
💥PARADISE LOST ELEPHANT FOLIO🇺🇸👁️ Wikipedia Folio (Creative Commons) 💥PARADIS...💥PARADISE LOST ELEPHANT FOLIO🇺🇸👁️ Wikipedia Folio (Creative Commons) 💥PARADIS...
💥PARADISE LOST ELEPHANT FOLIO🇺🇸👁️ Wikipedia Folio (Creative Commons) 💥PARADIS...
 
Copy of Copy of Black Modern Minimalist Presentation (5).pdf
Copy of Copy of Black Modern Minimalist Presentation (5).pdfCopy of Copy of Black Modern Minimalist Presentation (5).pdf
Copy of Copy of Black Modern Minimalist Presentation (5).pdf
 
Girls Call Dehradun 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Dehradun 000XX00000 Provide Best And Top Girl Service And No1 in CityGirls Call Dehradun 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Dehradun 000XX00000 Provide Best And Top Girl Service And No1 in City
 
High Profile Girls Call Vadodara 🎈🔥000XX00000 🔥💋🎈 Provide Best And Top Girl S...
High Profile Girls Call Vadodara 🎈🔥000XX00000 🔥💋🎈 Provide Best And Top Girl S...High Profile Girls Call Vadodara 🎈🔥000XX00000 🔥💋🎈 Provide Best And Top Girl S...
High Profile Girls Call Vadodara 🎈🔥000XX00000 🔥💋🎈 Provide Best And Top Girl S...
 
Girls Call Mysore 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Mysore 000XX00000 Provide Best And Top Girl Service And No1 in CityGirls Call Mysore 000XX00000 Provide Best And Top Girl Service And No1 in City
Girls Call Mysore 000XX00000 Provide Best And Top Girl Service And No1 in City
 
🚂🚘 Premium Girls Call Bhubaneswar 🛵🚡000XX00000 💃 Choose Best And Top Girl Se...
🚂🚘 Premium Girls Call Bhubaneswar  🛵🚡000XX00000 💃 Choose Best And Top Girl Se...🚂🚘 Premium Girls Call Bhubaneswar  🛵🚡000XX00000 💃 Choose Best And Top Girl Se...
🚂🚘 Premium Girls Call Bhubaneswar 🛵🚡000XX00000 💃 Choose Best And Top Girl Se...
 
IC degree offer diploma Transcript
IC degree offer diploma TranscriptIC degree offer diploma Transcript
IC degree offer diploma Transcript
 
Lecture 4 - Rose.pptx rose under protected cultivation
Lecture 4 - Rose.pptx rose under protected cultivationLecture 4 - Rose.pptx rose under protected cultivation
Lecture 4 - Rose.pptx rose under protected cultivation
 
DIAPOSITIVAS ENRIQUE IGLESIASbibliografia.pptx
DIAPOSITIVAS ENRIQUE IGLESIASbibliografia.pptxDIAPOSITIVAS ENRIQUE IGLESIASbibliografia.pptx
DIAPOSITIVAS ENRIQUE IGLESIASbibliografia.pptx
 
Girls Call Mumbai 9910780858 Provide Best And Top Girl Service And No1 in City
Girls Call Mumbai 9910780858 Provide Best And Top Girl Service And No1 in CityGirls Call Mumbai 9910780858 Provide Best And Top Girl Service And No1 in City
Girls Call Mumbai 9910780858 Provide Best And Top Girl Service And No1 in City
 
AWS Architecture Icons - Dark mode. Use AWS icons today!
AWS Architecture Icons - Dark mode. Use AWS icons today!AWS Architecture Icons - Dark mode. Use AWS icons today!
AWS Architecture Icons - Dark mode. Use AWS icons today!
 
THE QUESTION NIGERIA AND OTHER COLLECTIONS (WORD) 2.docx
THE QUESTION NIGERIA AND OTHER COLLECTIONS (WORD) 2.docxTHE QUESTION NIGERIA AND OTHER COLLECTIONS (WORD) 2.docx
THE QUESTION NIGERIA AND OTHER COLLECTIONS (WORD) 2.docx
 
New Girls Call Mumbai 9920725232 Unlimited Short Providing Girls Service Avai...
New Girls Call Mumbai 9920725232 Unlimited Short Providing Girls Service Avai...New Girls Call Mumbai 9920725232 Unlimited Short Providing Girls Service Avai...
New Girls Call Mumbai 9920725232 Unlimited Short Providing Girls Service Avai...
 
Why We Love Visiting Art Galleries?
Why We Love Visiting Art Galleries?Why We Love Visiting Art Galleries?
Why We Love Visiting Art Galleries?
 
SDSU degree offer diploma Transcript
SDSU degree offer diploma TranscriptSDSU degree offer diploma Transcript
SDSU degree offer diploma Transcript
 
in Dubai Online contact "+971)555095267 " to buy abortion pills in Dubai, Abu...
in Dubai Online contact "+971)555095267 " to buy abortion pills in Dubai, Abu...in Dubai Online contact "+971)555095267 " to buy abortion pills in Dubai, Abu...
in Dubai Online contact "+971)555095267 " to buy abortion pills in Dubai, Abu...
 
Pune Girls call Service 000XX00000 Provide Best And Top Girl Service And No1 ...
Pune Girls call Service 000XX00000 Provide Best And Top Girl Service And No1 ...Pune Girls call Service 000XX00000 Provide Best And Top Girl Service And No1 ...
Pune Girls call Service 000XX00000 Provide Best And Top Girl Service And No1 ...
 

Die materials and sysytem

  • 1. DIE AND DIE SYSYTEM Dr.shiva sai vemula 1st year MDS Dept.of PROSTHODONTICS 1
  • 2. CONTENTS • DIE:- • INTRODUCTION • TERMINOLOGY • CLASSIFICATION • IDEAL PROPORTIES • DIE (HARDNER,SPACER AND LUBRICANT) • DIE SYSYTEM:- • CLASSIFICATION • DI LOC TRAY SYSTEM • PINDEX SYSTEM • DVA SYSTEM • ZEISER MODEL SYSTEM • MONOTRAC ARTICULATION SYSTEM • DIE PINS 2
  • 3. Direct fabrication of extra coronal restoration in the mouth is inconvenient, difficult, time consuming and virtually impossible. A cast and die system captures the necessary information so that can be transferred to the laboratory. An accurate working cast with removable dies is essential to make a well fitting restoration. INTRODUCTION 3
  • 4. Die :- It is the positive reproduction of the form of the prepared tooth in any suitable substance. Cast :- A life-size likeness of some desired form. It is formed within or is a material poured into a matrix or impression of the desired form Dowel pin:- A metal pin used in stone casts to remove die sections and replace them accurately in the original position 4
  • 5. MATERIALS USED FOR MAKING DIES NON METALLIC METALLIC • Gypsum materials • Cements(Silicophospate cement) • Refractory die materials • Polymers (epoxy resin, polyurethane) • Electroformed dies • Amalgam • Sprayed metals 5
  • 7. Ideal properties • It should be dimensionally accurate. • It should have high abrasion resistance and smooth surface. • Toughness:- it should resist to breakage (burnishing foil) • Ability to reproduce all the fine details in the impression. • Compatibility with all the impression material. • Easy and quick manipulation and rapid fabrication. • Non toxic. • Ecominical 7
  • 8. ADA TYPE 4 stone •Dimensional accuracy Most situations Accurate proportioning Eessential • Straight forward Technique • Low cost Low abrasion resistance ADA TYPE 5 stone •Straight forward technique Increased expansion Base metal alloy situations Accurate proportioning essential • Low cost •Improved strength than type4 Materials Advantages Disadvantage Use Precaution 8 NON METALLIC
  • 9. Materials Advantages Disadvantage Use Precaution Electroplating High strength Good abrasion resistance •Time consuming Complete ceramic crowns •Silver uses toxic cyanide •Incompatible with many impression materials Amalgam •High strength •Good abrasion resistance • low setting time • high thermal conductivity( wax pattren will cools fast- distertion) Complete ceramic crowns 9 METALLIC
  • 10. A low viscosity polyvinyl siloxane duplicating material is used to reproduce dies Adapt a strip of putty around the prepared teeth on working cast and dies to limit the flow of mold material. RefractoryDies:- These are made for preparation of all ceramic restorations. Advantages – Excellent marginal adaptation 10
  • 11. • The duplication material should be at least 3.00mm thick and it should extend 3 mm beyond incisal edges of teeth to provide adequate support refractory material. • The duplicating material is allowed to set for about 30 minutes. • The master dies removed from cast and duplicating material. By applying pressure on base of tray, master cast is loosened with duplicating material intact. 11
  • 12. Allow the refractory dies set for about 1-2 hours. The refractory material is poured and vibrated in the area of missing dies. 12
  • 13. Die Hardener • Materials applied on the surface of die to increase the surface hardness. • Should have low viscosity • Commonly used materials as die hardeners:  Cyanoacrylate resins (Eg: Premabond)  Acrylic resin lacquer (Eg: Die Prep die hardener) • Optimal Thickness  2-3 mm, but if not properly manipulated10 mm 13
  • 14. Die Spacer :- An agent applied to a die to provide space for the luting agent in the finished casting. Types of die spacers : • Resins • Paint or liquids • Model paint • Coloured nail polish • Thermoplastic resins dissolved in volatile solvents. 14
  • 15. Should be applied 0.5-1mm short of margin Brush strokes in one direction Wait for 2 mins before applying next coat • W.V.Campagni et al (JPD 1986;55;324) concluded that grooves did not disrupt seating when die spacer application was specifically omitted from grooves • Optimal thickness:-20-40 micro meter 15
  • 16. die lub Die Separator The lubricants or die separators which can be used to prevent wax from adhering to stone are oils, liquid soap, detergents and a number of commercially available preparations. 16
  • 18. Die systems Working cast with separate die Working cast with removable die Without die pins With die pins Pre pour technique Post pour technique 18
  • 19. Working cast with separate die Method of Simplest fabrication between Advantages: • Easy to fabricate Keeps relation abutments fixed. • Better contours and emergence profile while wax pattern fabrication. 19
  • 20. Disadvantages:- Wax pattern must be transferred from die to cast  destroy internal adaptation of wax Some times difficult to seat wax pattern on the cast - Different impressions - Second pour –impression damaged - Different thickness of spacers Procedure:- Both working cast and sectional die can be obtained by: - Pouring impression twice - Making two impressions 20
  • 21. Trim sectional cast Octagonal in shape Sides parallel or slightly taper towards base Handle 1 inch long Pear shaped acrylic bur  trimmed apical to finish line 21
  • 22. Contour be approximately like root  To facilitate good axial contours in restoration Philippe A. et al (IJP 1993:6;533) compared 2 removable die systems (Zeiser system (Girrbach Dental), Pindex (Coltene-Whaledent) and working cast with separate die. They concluded that the Zeiser system was the most accurate of the three systems studied, followed by working cast with separate die. 22
  • 23. WORKING CAST WITH REMOVABLE DIE Advantage: Convenient to use Various drawback of separate die are overcome Disadvantage: Risk of introducing error in the pattern if die does not seat accurately in the working cast 23
  • 24. Requirements: 1) Dies must return to their exact original position 2) Dies must remain stable even when inverted 3)Cast containing dies must be easy to mount on an articulator 24
  • 25. WORKING CAST WITH REMOVABLE DIE working cast with die pins preformed plastic trays working cast without die pins 25
  • 26. Pre pour technique Devices are oriented in the impression before it is poured Post pour technique Attached to the underside of the cast that has already been poured Systems using die pins 26
  • 28. Procedure Positioning of dowel pins A) Marking to act as guide in placement of pins Mann paralleling instrument Clamps holding Dowel pins B) 28
  • 29. C) Disposable anesthetic needles D) Straight pins with modeling clay E) Matchsticks F) Bobby pins 29
  • 30. Die stone impression poured into filling the of teeth and covering the knurled end of the dowel pin V- shaped orientation grooves made Separating media-area adjacent to each dowel pin Small wax ball placed on tip of each dowel 30
  • 31. 31
  • 32. Using metal strips Thin metal strips (0.001 gauge) were carefully wedged in the impression Placement and tapering of matrix band Matrix band kept parallel in case of multiple preparations 2 mm of band exposed 32
  • 34. Di lok tray system 34
  • 35. Snap apart plastic tray with internal orienting grooves and notches to reassemble the working cast and die. Before using check for space in articulator Cast poured1inch height Trim to fit Di lok tray 35
  • 36. Fill tray ¾ with stone Seat the cast  cervical area of teeth be about 4mm above the edge of tray Disassemble the tray 36
  • 37. 37
  • 38. PINDEX SYSTEM (Coltene / Whaledent) Light beam director Work table Drill hole Handle bar Motor housing 38
  • 39. Bottom should be flat to ensure that the Pins will be parallel Faciolingual width – 20 mm Two pins for each die Two for each pontic area One /Two pins in each terminal segment containing unprepared teeth 39
  • 40. 40
  • 41. Shorter pins on lingual side Longer on buccal side makes the ends of the dowel pins more accessible for easy removal after the casts are mounted. Ends of shorter sleeves  place wax 41
  • 42. 42
  • 43. DVA System (dental ventures of america) Pre manufactured base system 43
  • 44. Marking dowel pin locations On clear plate with twin tip marker Impression on alignment fixture Secured with putty Drill holes for dowel pins Using drilling press 44
  • 45. Insert dowel pins Impression is poured and stone is placed around dowel pin Alignment fixture is replaced over poured impression Set cast is removed from baseplate with gentle tapping 45
  • 46. Cast is trimmed Cast is sectioned Definitive cast trimmed with DVA model system 46
  • 47. 47
  • 49. Impression leveled, blocked out with silicone putty positioned over the base Pin locations determined Pin holes drilled in base 49
  • 50. Pins inserted into base Impression is poured Base inverted The cast is separated from the impression 50
  • 51. Monotrac Articulation Vertical single pour base (VSP) Pour stone Spray silicone spray on VSP Cones. Separator on stone 51
  • 52. Trim impression –fit the base molds Pin –act as guide for placement 52
  • 53. Remove base mold and impression VSP base removed by tapping 53
  • 54. 54
  • 55. Conventional dowel pin systems Dowel pin (GPT 8): a metal pin used in stone casts to remove die sections and replace them accurately in the original position Straight Curved 55
  • 56. Straight dowel pins Flat sided dowel Double straight dowel with common head (Bi pin) Rounded single dowel pin BI-PIN with case BI-FIXED-pin Doubles straight dowel with fixing wire for accurate positioning in impression 56
  • 57. 57 REFRENCES • Anusavice K.J.-“Phillips’Science of Dental materials” 11th edition , 2003 • Craig’s R.G., Powers J.M. – “Restorative Dental Materials” 11thedition, 2002 • RosenstielS.F., Land M.F.–“Contemporary fixe prosthodontics” 3rd edi. 2001. • Rudd K.D., Morrow R.M. – “Dental laboratory procedures” FPD 2nd edi, 1986. • Shillingburg H.T. – “Fundamentals of fixed Prosthodontics.”3rd edition • Juan Glen Serrano, Xavier Lepe, John D. Townsend, Glen H. Johnson, Stephen Thielke-An accuracy evaluation of four removable die systems-J Prosthet Dent 1998;80:575-86. • C, Douglass Smith,Arun Nayyar, David L. Koth-Fabrication of removable dies using cemented dowel pins J Prosthet Dent: 1992:68:372-4