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Dental Assisting NDAEB: Questions With Complete Solutions
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Dental Assisting NDAEB: Questions With Complete Solutions
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Dental Assisting NDAEB: Questions With CompleteSolutions
Midsagittal plane Right Ans - divides the body into equal right and left
sides
Hemihydrate Right Ans - Removal of water to become one-half part water
to one part of calcium sulfate, forming the powder product of gypsum.
Polymer Right Ans - molecules composed of many monomers; makes up
macromolecules
Slurry Right Ans - Mixture of gypsum and water used in the finishing of
models
Volatile Right Ans - Substance that can evaporate easily and is very
explosive
Sandblaster Right Ans - hand held unit that sprays sand at a high speed,
creating an etching or pitting on a surface area of metal, porcelain or acrylic.
Suitable for repairs of crowns,dentures,appliances, cementation of crowns,
bridges and inlays
Vibrator Right Ans - used to remove air bubbles and aid in the flow of
plaster or stone when pouring models
Vaccum former Right Ans - A small electrical appliance used to construct
custom trays for bleaching, mouth guards, and positioners for orthodontics
• When constructing an impression tray, you will use a rigid, heavy-gauge
plastic that requires a spacer and a handle.
• When constructing provisional coverage, you will use a lighter-gauge plastic
that does not require a spacer or a handle.
• When constructing a vital bleaching tray, you will use a lighter-gauge plastic
that does not require a spacer or a handle.
• When constructing a mouth guard, you will use a heavier-gauge, flexible
plastic that does not require a spacer but does require an attachment for the
strap.
,Heat sources in dental office Right Ans - propane or butane torch to heat
wax
Articulator Right Ans - An articulator is a mechanical device used in
dentistry to hold maxillary and mandibular dental models in a position to aid
in reproduction of the mandible in relation to the maxilla.
The articulator allows the dentist and the dental laboratory technician to
fabricate removable prosthodontic appliances (dentures), fixed prosthodontic
restorations (crowns, bridges, inlays, and onlays) and orthodontic appliances
Face bow Right Ans - The face bow is the first step the dentist takes to
determine the positional relationship of the maxillary arch to the tem-
poromandibular joints. The centric relation or bite record is a measurement of
where the teeth are positioned when the joints are aligned correctly and
before the teeth actually come in contact.
Dental lathe Right Ans - The dental lathe is used to polish or trim custom
trays, provi-sionals, dentures, and indirect restorations. The lathe is designed
with a protective plastic see-through shield that is brought down over the
work area. The lathe has revolving threaded extensions from each end of the
motor. Attachments such as an abrasive grinding wheel or a rag wheel are
placed on these extensions. After each use, these attachments must be
sterilized before reuse
Pumice and other polishing agents are used during polish-ing. A protective
pan behind and under the wheel is used to hold the pumice and catch the
spatter.
Gypsum Right Ans - -Mineral, calcium sulfate di-hydrate
-Heated to refine material, which drives off some of the water resulting in
(stone or plaster)
-Water must be added back to reconstitute (utilize or mix) the material, which
leads to a setting expansion
-Since plaster requires more water to reconstitute than stone, it undergoes a
greater setting expansion and therefore has a lowered compressive strength
compared to stone
-Stone (alpha) is superior to plaster (beta)
,Nuclei of crystallization Right Ans - crystals of gypsum form in clusters,
branching from a common center called the growth and interlocking of these
crystals contributes to strength, rigidity, and dimensional change
three forms of gypsum Right Ans - model plaster, dental stone, and high-
strength stone
gypsum powder to water ratios Right Ans - Dental plaster (100 g) to 45-50
ml water.
Dental stone (100 g) to 30-32 ml water.
High-strength stone (100 g) to 19-24 ml water.
three pouring methods for dental models Right Ans - A model consists of
two parts: the anatomic portion, which is created from the alginate
impression, and the art portion, which forms the base of the cast
•Double-Pour Method
The anatomic portion of the cast is poured first. Then a second mix of plaster
or stone is used to prepare the art portion. A free-form base may be created
by hand, or a commercial rubber mold can be used.
•Box-and-Pour Method
The impression is surrounded with a "box" made from boxing wax. The
completed box should extend at least ½ inch above . the palatal area of the
maxillary impression and ½ inch above the tongue area of the mandibular
impression.
•Inverted-Pour Method
The inverted-pour approach consists of mixing one large mixture of plaster or
stone and pouring up the impression first, and then placing a base of material
on a tile or counter to invert the impression in a single step. This is the most
common way of "pouring up" an impression.
Components of a full denture Right Ans - base - fits over the residual
alveolar ridge and surrounding gingiva
flange- extends over the attached muscles from the cervical margin
post dam- covers the hard palate
arificial teeth-3rd molars not included for mastication and speaking
14 teeth per arch
, indications for a partial denture Right Ans - • To replace several teeth in
the same quadrant or in both quadrants of the same arch
• To serve as a temporary replacement for missing teeth in a child (as
necessary, a new appliance is constructed to compensate for the child's
growth)
• To avoid additional reduction in tooth structure on primary or permanent
dentition of children and adolescents
• To replace missing teeth for a patient who cannot tolerate longer
appointments and the extensive preparation required for placement of a fixed
bridge or implants
• To allow the patient to maintain good oral hygiene
• To serve as a splint to support periodontally involved teeth
Contraindications for a partial denture Right Ans - • A lack of suitable teeth
in the arch to support, stabilize, and retain the removable prosthesis
• Rampant caries or severe periodontal conditions that threaten the
remaining teeth in the arch
• Lack of patient acceptance for esthetic reasons
• Chronic poor oral hygiene
indications for full dentures Right Ans - • The patient is totally edentulous.
• The remaining teeth cannot be saved.
• The remaining teeth cannot support a removable partial denture, and no
acceptable alternatives are available.
• The patient refuses alternative treatment recommendations.
contraindications of full dentures Right Ans - • Another acceptable
alternative is available.
• Physical or mental illness affects the patient's ability to cooperate during
fabrication of the denture and to accept or wear the denture.
• The patient is hypersensitive to the denture materials (a hypoallergenic
denture material may be indicated).
• The patient is not interested in replacing missing teeth.
Xerostomia Right Ans - Dryness of the mouth caused by reduction of saliva
Fossa Right Ans - shallow depression on the lingual surfaces on a tooth
most common chronic disease in children Right Ans - dental caries
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