Custom Trays
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•
Individualized trays for making
final impressions
Made on a diagnostic cast
Purpose of a Custom Tray
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•
Improve retention (border molded)
Minimize:
•
Impression material distortion
•
•
Uniform thickness
Rigid tray
Purpose of a Custom Tray
Minimize:
• Tissue distortion
• Less viscous material
• Accurately adapted tray
•
Costs
•
less impression material used
Extension
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•
2-3 mm short of the peripheral role
Diagnostic casts often
overextended (irreversible
hydrocolloid)
Block-Out Undercuts
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•
Baseplate wax
Prevent tray from
locking onto cast
Lubricate cast
(Petroleum jelly or
Alcote)
Wax Spacer
•
Minimizes hydraulic
pressures
Do not place relief
over blockout
• Already relief in
those areas
•
•
Provides room for
impression material
Auxiliary Handles Mandible
•
•
•
For stabilization
Orient the tongue
Area of 2nd premolars / 1st molars
Finish
Do not polish - adhesion
 No holes until border molded

Custom Tray Videos
• Outlines for Custom Trays
• Custom trays
Border Molding
•
Performed with
Thermoplastic modeling compound
• Waxes
• Impression materials
•
Heat Source for Compound
Butane Torch or Bunsen Burner
for quicker softening
(adjustable)
Hanau Torch slower, more control
View Videos on Website
• Using a Butane Torch
• Hanau Touch-o-matic Bunsen Burner
• Hanau Torch Alcohol Burner
http://removpros.dentistry.dal.ca/Videos.html
Tray Wax Spacer


Can be left in place or removed
Recommend removal prior to border molding:



Less chance of overextensions
Difficult to remove after border molding
Spacer can melt during border molding
Tempering Compound
Temper in water bath (135-140°F) for
several seconds



Prevents burning
Hot water bath will keep compound soft
Dial at ‘1’ on ‘140’
High Water Line
Reaches
temperature when
this light goes out
’ON’ light
After Removal

Chill in cold water

Trim excess on internal or
external surfaces

Thin to 4-5 mm

Clean debris from tray
Assessing Peripheral Role
Proper thickness
 No overlap

Mandible
More difficult
 Changing position of the floor of the
mouth

Posterior Buccal Areas
Pull cheek upward while holding
tray in place
 Have patient suck cheeks inward
while holding tray in place

Retromolar Pad

Should be covered (at least partially) to
provide a seal and comfort to the patient
External Oblique Ridge
Don’t extend past
 Palpate cheek at angle
of the mandible

 Smooth
transition
between mandible &
border - not palpable
Buccal Extension

Look for fold in vestibule
Retromylohyoid Space

Distolingual border can
extend
 Straight
down from the
retromolar pads
 Anteriorly to varying
degrees
 Almost never angles
posteriorly from retromolar
pads
Posterior Lingual Areas

Denture should not lift with normal
tongue movements
Border Molding Video