Valplast Flexible Partials - PowerPoint PPT Presentation

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Valplast Flexible Partials

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Valplast Flexible Partials Lab Techniques for Flexible Partial Dentures Introduction to Flexible Partials Simple solution to provide a removable restoration No ... – PowerPoint PPT presentation

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Title: Valplast Flexible Partials


1
Flexibility is our Strength
Making Millions Smile
2
Valplast Flexible Partials
  • Lab Techniques for
  • Flexible Partial Dentures

3
Introduction to Flexible Partials
  • Simple solution to provide a removable
    restoration
  • 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

4
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 and sturdy)
  • In use since 1953

5
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

6
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7
Visually Survey Model
  • Visualize design
  • Aesthetics
  • Path of Insertion
  • Comfort
  • Accuracy of Model

Remove Discrepancies
8
Wrap-Around Clasp
  • Most Common Clasp
  • Hugs Tissue
  • Minimal Coverage of Tooth
  • Stability against vertical and rotational movement

Design is made with Red Pencil
9
Split Wrap-Around
  • Clasp Separated from Flange
  • Similar to Roach Clasp
  • Flexibility along Horizontal and Vertical Axes

10
Spur
11
Anchor
12
Maxillary Wax Relief
  • Relief Wax placed along Buccal Periphery
  • Necessary on All Maxillary Cases

Use Hot Wax for Relief
13
Mandibular Wax Relief
  • Junction of clasp with saddle is more rigid area.
  • Undercut toward periphery must be relieved

14
Blocking and Relieving
  • Lingual Undercuts Relieved
  • Interproximal Spaces Closed
  • Obstructive Undercuts Removed

15
Final Preparation
  • Beading Post Dam
  • Etching Design

16
Duplication
  • Soak Model
  • Prepare Flask
  • Pour Gel
  • Let set 15 minutes in air
  • and 15 minutes in water

17
Waxing After Setup
  • Use of Prefabricated Forms is Recommended to
    Insure Proper Thickness and Uniformity

18
Palatal Waxing
  • Soften Palate
  • Press to Position
  • Seal all Borders

19
Buccal Waxing
  • Using Prefabricated Form
  • Cut Form to Size
  • Press to Model
  • Seal all Borders

20
Bottom Half Investing
21
Spruing
22
Top Half Investing
23
Top Half Investing
24
Teeth Prepared for Retention
25
Processing
26
Melting - 11 Minutes
27
Injecting
28
Lets See That Again...
29
After Processing
30
Pre-Finishing
Econo-Cutter
Trimmer
Dark Grinding Wheels
31
Fitting and Rubberizing
Vulcanite Burs
Brown Rubber Wheels
32
Polishing
33
Polishing Motion is Important
34
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

35
Adjustments
  • Minor clasp tightening or loosening can be done
    by heating the clasp again in very hot water and
    bending it severely in the needed direction.
    This will purposely warp the area enough to
    change its position
  • Grinding should be done as a last resort.
  • Use a Standard Green Mounted Stone (used usually
    for porcelain) to adjust Valplast. 20K to 30K
    rotation and constant motion

36
Small Additions - Welding
  • Using hot air welder and welding rod, build up a
    boxing 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.

37
Large Additions Injection
  • Wax new section on duplicate model to original
    partial
  • Invest, Sprue, Wash out wax
  • Prepare bonding site with acid etch solution
    (Val-Fuse Repair Liquid)
  • Inject, finish, and polish

38
Relines
  • Take Putty Matrix to record tooth position
  • Strip teeth from partial (in blocks) while
    duplicating the model.
  • Rewax new base using matrix to position teeth
  • Invest and process using repair technique to bond
    top-half exposed Valplast to new base.
  • Finish and Polish

39
Clinical Prep for Tooth Addition
  • Clinician should take overall alginate impression
    to lift out case
  • Counter-model for bite
  • Before pouring the model, any deposits or
    adhesives should be removed from surface or the
    process will lead to an unintended reline.

40
Clinical Prep for Reline
  • Closed-mouth rubber-base reline impression.
  • Pick-up overall alginate impression.
  • Counter not necessary

41
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