Fixed Questions with complete solution 2024/2025 Fixed: Impressions and Working Casts and Dies (NM)
Impression - correct answer ____ = an imprint or negative likeness of the teeth, edentulous areas, and associated structures, made in a plastic material that becomes relatively hard or set whil...
Fixed: Impressions and Working Casts
and Dies (NM)
Impression - correct answer ✔____ = an imprint or negative likeness of the
teeth, edentulous areas, and associated structures, made in a plastic material
that becomes relatively hard or set while in contact with these tissues.
Master cast; master - correct answer ✔_____ = the replica of what was
captured by the impression; usually a prepared tooth. The term "___" usually
implies that the cast will be used in the fabrication of a prosthesis or device. It
cannot be modified or altered in anyway as it represents the exact replica of
the prepared tooth.
die; Dies - correct answer ✔In fixed prosthodontics, a ___ is the positive
reproduction of the prepared tooth. ___ can be made from a variety of
material and by a variety of techniques, but the most common and easiest
method uses improved dental stone.
rigid, plastic or elastic; rigid and plastic; elastic - correct answer ✔Impression
materials can generally be classified as ___(3)____. Essentially, the _____
types of materials are used for making impressions of edentulous patients,
whereas the ____ type is used when teeth are present and undercuts exist.
rigid; secondary or corrective impressions for edentulous arches - correct
answer ✔Impression plaster and metallic oxide pastes (zinc oxide and
eugenol) are ___ impression materials commonly used as _____. Essentially,
the procedure consists of first making a preliminary impression (primary) with
dental impression compound. This impression is trimmed to relieve extended
areas and it is then relined with a thin mix of the corrective wash material.
Plastic; thermoplastic; plastic; impression compound and waxes - correct
answer ✔The ___ impression materials are ____, i.e.: they soften in the
, presence of heat and harden as they cool. Unlike the rigid impression
materials that undergo an irreversible chemical reaction during their "set," the
_____ impression materials can be alternately softened and hardened without
chemical changes in the material. This category of impression material
includes __(2)___
elastic - correct answer ✔The ____ impression materials are a group of
products which have the characteristic that within certain limits, they will
spring back to their original shapes after they have been distorted. This
permits their use in applications where the presence of remaining teeth
produces undercuts that would prohibit the withdrawal of other impression
materials without severe distortion.
elastomeric - correct answer ✔Because of their elastic nature and other
desirable characteristics, the ____ impression materials are used more than
any other type of material for registering oral structures.
alginate hydrocolloid; irreversible colloid; Alginate - correct answer
✔Developed just prior to 1940, this elastomeric impression material, also
known as ____ or _____, has been used more than any other impression
material in dentistry. ____ is commonly used when making diagnostic casts. It
is also used for impressions for removable partial denture prosthesis, as well
as initial impressions for complete dentures.
Reversible hydrocolloid; agar hydrocolloid; agar hydrocolloid - correct answer
✔____, also called ____, has been a part of dentistry for 70 years. This
impression material is unique in that upon heating, it softens to form a viscous
liquid (a sol). When cooled, it hardens to an elastic solid (a gel). Essentially
there are two principal uses for ____ in dentistry. The first of these is as an
impression material for fixed prosthodontic procedures involving the
fabrication of precision cast restorations. The other use is as a duplicating
material in the dental laboratory.
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