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Making Millions Smile
Flexib i l i ty is our Streng th
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Valplast Flexible Partials
Lab Techniques for
Flexible Partial Dentures
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Introduction to Flexible Partials
Simple solution to provide a removablerestoration
No tooth preparation needed
No metal frame needed Finished partial with one trip through the
laboratory
Injection Technique Valplast Partials are repairable and relinable
Guaranteed not to break
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Type of Material
Valplast is a type of Nylon Thermoplastic
Injection Molded
Denser than acrylic Lower Water Absorption than PMMA
Flexural modulus around 470MPa at body
temperature (making it both flexible andsturdy)
In use since 1953
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Lab Procedure - Overview
Design, block and relieve master model Duplicate stone model Try-in (if required) or Set-up on Master
Transfer set-up to duplicate model Wax with prefabricated patterns Invest, Sprue, Wax Elimination
Process with Manual Injector Finish and Polish
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Visually Survey Model
Visualize design
Aesthetics
Path of Insertion
Comfort
Accuracy of Model
Remove Discrepancies
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Wrap-Around Clasp
Most CommonClasp
Hugs Tissue
Minimal Coverage ofTooth
Stability againstvertical and
rotational movement
Design is made with Red Pencil
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Split Wrap-Around
Clasp Separated fromFlange
Similar to Roach
Clasp Flexibility along
Horizontal and
Vertical Axes
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Spur
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Anchor
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Maxillary Wax Relief
Relief Wax placedalong Buccal
Periphery
Necessary on AllMaxillary Cases
Use Hot Wax for Relief
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Mandibular Wax Relief
Junction of clasp withsaddle is more rigid
area.
Undercut towardperiphery must berelieved
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Blocking and Relieving
Lingual UndercutsRelieved
InterproximalSpaces Closed
Obstructive
Undercuts Removed
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Final Preparation
Beading Post Dam
Etching Design
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Duplication
Soak Model
Prepare Flask
Pour Gel
Let set 15 minutesin air
and 15 minutesin water
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Waxing After Setup
Use of PrefabricatedForms is
Recommended to
Insure ProperThickness and
Uniformity
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Palatal Waxing
Soften Palate
Press to Position
Seal all Borders
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Buccal Waxing
Using Prefabricated Form:
Cut Form to Size
Press to Model
Seal all Borders
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Bottom Half Investing
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Spruing
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Top Half Investing
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Top Half Investing
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Teeth Prepared for
Retention
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Processing
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Melting - 11 Minutes
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Injecting
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Lets See That Again...
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After Processing
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Pre-Finishing
Econo-
CutterTrimmer
Dark
GrindingWheels
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Fitting and
Rubberizing
Brown
Rubber
Wheels
Vulcanite
Burs
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Polishing
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Polishing Motion is
Important
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Advising Clinician on Insertion
and Adjustment
Partial must be placed in very hot water(150F or more) for a minute prior to
insertion and allowed to cool to a tolerable
temperature. This process makes the partial as flexible as it
would be at body temperature. This
minimizes adjustments
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Adjustments
Minor clasp tightening or loosening can be doneby heating the clasp again in very hot water and
bending it severely in the needed direction. This
will purposely warp the area enough to changeits position
Grinding should be done as a last resort.
Use a Standard Green Mounted Stone (usedusually for porcelain) to adjust Valplast. 20K to
30K rotation and constant motion
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Small Additions - Welding
Using hot air welder and welding rod, build up aboxing in the addition site to secure a new tooth
Select a matching acrylic tooth.
Break a porcelain tooth to obtain pins Heat each of two pins in flame to cherry red and
embed in the partial half way (pin head
protruding)
Cure scooped stock tooth over pins using tooth-shade or pink acrylic.
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Large AdditionsInjection
Wax new section on duplicate model tooriginal partial
Invest, Sprue, Wash out wax
Prepare bonding site with acid etchsolution (Val-Fuse Repair Liquid)
Inject, finish, and polish
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Relines
Take Putty Matrix to record tooth position Strip teeth from partial (in blocks) while
duplicating the model.
Rewax new base using matrix to positionteeth
Invest and process using repair technique
to bond top-half exposed Valplast to newbase.
Finish and Polish
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Clinical Prep for Tooth
Addition
Clinician should take overall alginateimpression to lift out case
Counter-model for bite
Before pouring the model, any deposits oradhesives should be removed from
surface or the process will lead to an
unintended reline.
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Clinical Prep for Reline
Closed-mouth rubber-base relineimpression.
Pick-up overall alginate impression.
Counter not necessary
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