Chapter 18 Question and answers already passed 2024/2025
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Course
DENTAL MATERIALS
Institution
DENTAL MATERIALS
Chapter 18 Question and answers already passed 2024/2025 Chapter 18: Dental Laboratory Materials Part I
rigid impression materials - correct answer used where no teeth are present, and material flexibility is unnecessary
impression plaster - correct answer gypsum product, 60cc of water to...
Chapter 18: Dental Laboratory Materials
Part I
rigid impression materials - correct answer ✔used where no teeth are
present, and material flexibility is unnecessary
impression plaster - correct answer ✔gypsum product, 60cc of water to 100
grams of plaster
metallic oxide paste - correct answer ✔two-paste system, zinc-oxide eugenol
base with resin accelerator. This paste hardens through chemical reaction
impression compound - correct answer ✔supplied in cakes and sticks; color-
coded for temperature flexibility; used to make a preliminary impression tray
plastic impression materials - correct answer ✔used with or without the
presence of teeth
thermoplastic - correct answer ✔material softens when heated and hardens
when cooled
compound - correct answer ✔supplied in sheets or stick form. The material is
composed of a thermoplastic resin base with filers and plasticizers. It softens
when heated and returns to solid when cool; used in copper bands for
independent crown preps
wax - correct answer ✔used for registration of bites or for impression of a
single tooth
, elastic impression materials - correct answer ✔used where teeth are present
and material must be flexible for removal from the oral cavity or teeth. Elastic
impression materials are either reversible or irreversiblehydrocolloids
reversible hydrocolloid - correct answer ✔impression material that can
change repeatedly from gel to solid states depending on the thermal condition
of the substance
gel state - correct answer ✔material is soft and pliable
solid state - correct answer ✔material has "set" or is rigid enough to hold the
form
irreversible hydrocolloid - correct answer ✔agar impression that can be
changed from gel to solid state as a result of a chemical reaction, and remain
in that condition after mixing and using
elastometric impression materials - correct answer ✔used to make
impressions of preparations and for demanding or accurate reproductions.
extruded gun - correct answer ✔a device that contains two independent
materials to be forced mixed and dispensed into a common tip as one material
polysulfide - correct answer ✔impression substance available in light,
regular, or heavy-bodied; aka mercapatan, this material will harden or set by
means of chemical action
silicone - correct answer ✔first supplied as a base putty with liquid
accelerator drops and termed condensation or conventional silicone type or
later as a two-paste system known as addition silicone type
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