MIDTERM (DENTAL MATERIALS LAB) - IMP. TRAYS

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Last updated 9:25 PM on 10/8/26
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24 Terms

1
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What is IMPRESSION ?

duplication of the structures in the oral cavity (including hard and soft tissue).

<p>duplication of the structures in the oral cavity (including hard and soft tissue).</p>
2
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Impression material:

material that is used to take an impression.

<p>material that is used to take an impression.</p>
3
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Impression tray:

instrument that is used to carry impression material into the oral cavity.

<p>instrument that is used to carry impression material into the oral cavity.</p>
4
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Requirements of impression trays :

  • be rigid and strong but not too thick (as to not gag patients)

  • borders should be 2mm short of the vestibular depth, no interference with soft tissues

  • entire borders of the tray should be smooth and rounded

  • handle of the tray should be angulated


5
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What is a stock tray?

  • ready made tray by manufacturer in specific size


6
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What is a custom tray?

  • fabricated from patient’s primary cast to get the final/secondary impression


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Types of stock trays:

  • Metal - reusable

  • Plastic - disposable


<ul><li><p>Metal - reusable</p></li><li><p>Plastic - disposable</p></li></ul><p></p>
8
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Types of custom trays:

  • Self / light cure PMMA

  • Shellac

  • Thermoplastic sheets


<ul><li><p>Self / light cure PMMA</p></li><li><p>Shellac</p></li><li><p>Thermoplastic sheets</p></li></ul><p></p>
9
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Impression tray classification:

metal / non-metal ( material )

stock / custom

dentulous / edentulous

upper / lower

perforated / non-perforated

with rim-lock / no rim-lock

<p class="p2">metal / non-metal ( material )</p><p class="p2">stock / custom</p><p class="p2">dentulous / edentulous</p><p class="p2">upper / lower</p><p class="p2">perforated / non-perforated</p><p class="p2">with rim-lock / no rim-lock</p>
10
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perforated =

with holes

excess material flows out of the tray

acts as mini locks for impression to stay on cast


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rim lock =

allows impression material to stay in place

12
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Dentulous trays have _____ shaped cross section for patients with teeth.

Dentulous trays have square shaped cross section for patients with teeth.

<p><strong>Dentulous trays</strong> have <strong><u>square</u></strong> shaped cross section for patients <em>with</em> teeth.</p>
13
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Edentulous trays have _____ cross section for patients without teeth.

Edentulous trays have rounded cross section for patients without teeth.

<p><strong>Edentulous trays</strong> have <strong><u>rounded</u></strong> cross section for patients <em>without</em> teeth.</p>
14
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What is a polymer?

large molecule consisting of multi monomers.

15
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What is polymerization?

reaction where monomer units become chemically linked together to form a polymer. - higher

molecular weight

16
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Heat cure polymerization begins at…

rubbery stage - when heat is added

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Chemical cure polymerization begins…

immediately at the mixing step - when liquid monomer meets powder polymer

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Light cure polymerization begins…

after contouring - when exposed to blue light

19
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Uses of Acrylic Polymers in Dentistry:

• Denture bases

• Record Bases

• Special Trays

• Artificial teeth

• Orthodontic Appliances

20
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Custom tray using chemical cure PMMA

  • composed of a powder polymer and liquid monomer

  • polymerization happens when the monomer is mixed with polymer


<ul><li><p>composed of a powder polymer and liquid monomer</p></li><li><p>polymerization happens when the monomer is mixed with polymer</p></li></ul><p></p>
21
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Custom tray using light cure acrylic PMMA

  • composed of a visible light cure sheet

  • require a light curing unit so polymerization can happen


<ul><li><p>composed of a visible light cure sheet</p></li><li><p>require a light curing unit so polymerization can happen</p></li></ul><p></p>
22
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Custom tray using shellac

  • hard sheet which become soft when placed in warm water

  • not used anymore


<ul><li><p>hard sheet which become soft when placed in warm water</p></li><li><p>not used anymore </p></li></ul><p></p>
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Custom tray using thermoplastic polymer sheets

  • retainers

  • home bleaching trays

  • night guards for patients with bruxism

  • mouth guard for contact sports


<ul><li><p class="p1">retainers</p></li><li><p class="p1">home bleaching trays</p></li><li><p class="p1">night guards for patients with <u>bruxism</u></p></li><li><p class="p1">mouth guard for contact sports</p></li></ul><p></p>
24
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Written on container, specified as ____ cure or ______ cure.

light or chemical