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dental materials unit 3 Question and answers 100% correct 2024/2025 $13.49   Add to cart

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dental materials unit 3 Question and answers 100% correct 2024/2025

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  • DENTURES,DX AND TX PLANNING
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  • DENTURES,DX AND TX PLANNING

dental materials unit 3 Question and answers 100% correct 2024/2025 dental materials unit 3 waxes - correct answer composed of natural or synthetic materials types: baseplate, boxing, bite registration, inlay (casting), utility, periphery and sticky usually organic molecules melting ...

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  • September 17, 2024
  • 29
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • DENTURES,DX AND TX PLANNING
  • DENTURES,DX AND TX PLANNING
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dental materials unit 3
waxes - correct answer ✔composed of natural or synthetic materials


types: baseplate, boxing, bite registration, inlay (casting), utility, periphery and
sticky


usually organic molecules


melting RANGE (not point) many numerous components


THERMOPLASTIC (soften under heat and solidify when cooled)


baseplate - correct answer ✔about 75% paraffin
brittle at room temp.
3x6 sheet, usually pink


uses:
spacer in custom tray fabrication
bite registration
initial arch pattern for a denture
bite rims in prosthetic dentistry


boxing wax - correct answer ✔soft and pliable at room temp
red in color, 10 x 2 x 1/4" thick strip

,use:
boxing the periphery of an impression to form a base when pouring in gypsum


bite registration - correct answer ✔usually dark green, yellow or blue; very
similar to baseplate wax
1mm thick, often in shape of arch
also called "occlusal wax"


sticky wax - correct answer ✔hard and brittle @ room temp.
VERY tacky when melted
supplied in 6" sticks or square cakes
bright orange or yellow in color
heated over an open flame


use: temporary luting (cementing) in lab
example - broken denture, articulation of models


utility wax - correct answer ✔soft and pliable at room temp.
supplied on 6 or 12" ropes
red, white, or blue in color


uses:
post-damming stock impression trays
boarder molding stock impression trays
temporary mounting models together
orthodontic wax (periphery wax is very similar!)

, inlay/casting wax - correct answer ✔used to fabricate the wax pattern in
investing and casting procedures
supplied in sticks or cakes in dark colors for contrast against model (dark blue
or green)
hardness is dictated by the amount of paraffin added


inlay wax: thermoplastic material - correct answer ✔for the fabrication of the
wax pattern
accuracy is critical to fit
40-60% paraffin (determines melting point)


inlay wax direct technique - correct answer ✔medium hardness
wax pattern is fabricated in the mouth on the prepped tooth


inlay wax indirect technique - correct answer ✔soft
fabricated on the model in lab
melted in flame; must be evenly melted
applied to prep in layers then carved to reproduce tooth structure
must be DARK (blue or green) to provide good line of demarcation against
model
no flaking or chipping should occur during carving
must remain rigid until burnout; must burn out leaving no residue


impression compound - correct answer ✔brittle at room temp.
softens when heated

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