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Sep 09th
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Home arrow Chairside arrow Basic Fabrication arrow chairside fab. arrow NTI matrix and... arrow ThermoPlasticBeads
Fabrication with ThermoPlasticBeads PDF Print

 Rules for Control of Parafunction

  I.  Minimize muscle contraction intensity

  1. Incisor contact only;  Prevent canine and molar contact
  • Opposing incisors can be covered with plastic.
  • Canine(s) cannot contact opposing plastic or teeth

   II.  Optimize condylar orientation during occluding events

  1. Minimize rotation of condyle by minimizing the vertical  dimension of occluding in all excursions / protrusion.
  • VDO can be increased as therapeutically indicated for Primary Clenching.

 

 Upon initial seating of a TPB-loaded device, border mold the excess and allow to begin to cool. When the TPB material becomes grey but not yet fully opaque, pump the device on and off a couple of times, and then allow to set until nearly white, then immerse in cold water.

For optimal retention, initially remove the device with a snapping motion and drop into a cup of cold water. It will quickly harden. The internals can be trimmed with a scalpel. Pre-sculpt the device prior to loading with the TPBs. Following final set, you can use a large lab bur for external sculpting with quick, brush strokes to avoid gumming up the blades. To make smooth again (if necessary), dip just the external edge portion back into hot water for 4 to 5 seconds, then seat back onto the teeth.
TPBs-0.jpg
TPBs-melting.gif
TPBs-5.jpg
Less than a teaspoon of TPBs
will adequately reline an NTI device
Submerge the TPBs in hot
water (or microwave in a mug
of water)...
...the beads will coalesce...
TPBs-6.jpg
TPBs-7.jpg
seated-w-TPB.jpg
...and become like putty.
Load device after confirming
a acceptable try-in
Final delivery following final
Right-exc.JPG
Protrusive.JPG
Left-exc.JPG
No canine contact
Protrusive. Distal end of DE can
be reduced if clenching is painful
No canine contact
retaining-TPB.JPG
To prevent the dislodgement of the TPB material (shown at left), wrap the material around the lingual wall and allow to fill the spaces adjacent to the Discluding Element.



Practitioners who use this method pre-warm the TPB's within the syringe far in advance, and keep in a warmed bath throughout the day.

TPBs-in-syringe.jpg
TPB-melted-in-syringe.jpg
Injecting-TPB-gel.jpg
TPBs can be pre-loaded into a disposable syringe
Submerge the syringe in very hot water to melt and coalesce the beads
Inject into the device.  Syringe with TPBs can be reheated
seating-w-TPB.jpg
Internal-TPB.jpg
Retained-TPB.JPG
TPB material is translucent upon initial insertion
Interproximal "wings" can be trimmed as you would SNAP... or use the "pump on and off" method prior to immersing in cold water.
Pre-sculpt the linguo-apico ledge of the DE prior to loading with TPBs. TPB material has been "wrapped around" to prevent dislodgement

TPB-extension.jpg
To extend the device to enhance retention, more TPB can be added to existing cured TPB material.

Dip the exposed TPB material (at the distal ends of the device) into very hot water for 3-5 seconds, thereby creating a "sticky" layer.  TPB material in the warm, clear putty stage will "bond" to the sticky layer, and can be manipulated to extend the extensions of the device.
TPB-extension-1.jpg
shaping-lingual-wings.gif
Press the material against the lingual surfaces of the teeth lateral to the device and allow patient's tongue to press material against their teeth while biting gently on the DE.  When the materials cools slightly to achieve its grey opacity stage, remove and replace, remove and replace (thereby eliminating any excessively prominent undercuts)...
TPB-example.gif
To enhance retention, shape the TPB material to form "lingual wings" prior to initial insertion.    ...then immerse in cold water, thereby allowing the material to slightly shrink and allow for "clunck it" fit.



Crooked or uneven mandibular incisors make the fabrication of a lower device using SNAP acrylic a challenge.  The utilization of the TPBs is far less time-consuming, and just as effective.

Crooked-teeth.jpg
Initial-seating.jpg
Crooked-internal.jpg
Initial insertion while TPB is transparent. 
Comfortable closing on device while TPB cools
Internal interproximal wings can easily be excised with a scalpel
Initial-seating-profile.jpg

Initial-seating-protrusive.jpg
Retruded clench reveals
excessive protrusion of
the DE
.

The unaltered distal end of the DE  may create excessive VDO in protrusive (see below)
Sculpted-profile.jpg
Sculpted-CR.jpg
Sculpted-protrusive.jpg
Labial protrusion of DE reduced.
Comfortably clenching
on final device
.
Reduced distal end of DE
(reduce as needed so as to makeprotrusive clenching
not painful)



 
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