03 02 lower special tray construction
TRANSCRIPT
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Week 3 Session 2Anatomy Quiz & Lower Special Tray
Construction
Unit 6ADT4305
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Part 1
A short quiz of upper oral anatomy and terminology
PLEASE PUT ALL NOTES AWAY
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C
D
B
A
E
Identify the zones lettered A-ENOT THE STRUCTURES
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FGHI
Identify the CUSPS lettered F > I
MESIAL
DISTAL
PALATAL
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JKLMN
Identify the oral structures lettered J > N
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Answers
What did you remember?
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Answers A to G
A. LabialB. BuccalC. PalatalD. LingualE. BuccalF. Mesiobuccal cuspG. Mesiopalatal cusp
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Answers H to N
H. Distobuccal cuspI. Distopalatal cuspJ. Upper labial frenumK. RougaeL. Upper right buccal frenum (Just ‘buccal
frenum’ does not count)M. Hard palateN. Tuberosity
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Part 2
Making an edentulous lower special tray for ZOE (Zinc Oxide Eugenol)
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Mark line of the ridges and outline of the sulcus
Identify location for rests, in the second premolar/first molar region
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Posterior margin to be
just above the retromolar pad
Identify areas of undercut e.g. below retromolar pad and block
out with wax
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Carefully adapt a sheet of light cure polymer
Do not over thinIf the cast shows through add
more material
Initial adaptation
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Initial trimming
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Push the material into the sulcus ensuring the material fully
extends into it
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Using a sharp tool carefully trim the material to the marked
extension.
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Trim all around the sulcus to the extension identified
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Make a handle approximately 20mm long, 15mm wide and 5mm thick taper towards the tip.
Flare the base of the handle to ease adaption to the base material.
Side view
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Position the handle in the midline of the anterior ridge.
The handle should be between 22mm and 25 mm from the depth of the
sulcus.It should be vertical but a slight anterior
tilt may be acceptable.When correctly positioned the flared
edges are blended into the base material.
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Rests
• The rest is made in the same way as the handle although slightly shorter.
• The base is flared and the rest positioned centrally on the ridge approximately in the position of the second premolar/first molar.
• The rest should be a maximum of 15 mm from the depth of the sulcus.
• If the rest is placed too far lingually it will restrict the tongue, too far buccally will distort the cheeks.
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Rests
• When both rests are completed the tray is checked and then smoothed with petroleum jelly. This smoothes the material and acts to seal the material to reduce surface inhibition of the set by oxygen in the atmosphere.
• The tray is placed in a light curing box and cured for 3 minutes. When cured the tray is removed from the cast, the tray is turned over and the fitting surface cured