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NDAEB Exam – Questions & Answers (Well Detailed)
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NDAEB Exam – Questions & Answers (Well Detailed)
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NDAEB Exam – Questions & Answers (Well Detailed)Periodontal disease Right Ans - Infection of the structures that support the
teeth (gums and bones)
Mercury, silver & tin Right Ans - What is amalgam fillings composed of
Periodontal disease Right Ans - Bone loss in the jaw is an indication of
what disease
Concept of radiation that states that exposure should be kept "as low as
resonably possible" Right Ans - What is the ALARA concept
Positive - Anode
Negative-Cathode Right Ans - What is the positive & negavtove electrode in
the x-ray tube
Film, phosphorous storage plate, digital sencor Right Ans - What are
examples of inage receptors
•To help the dentist see conditions in the mouth not visitble to the eye
Right Ans - •What is the purpose of dental x-rays
▪bone loss
▪info during dental procedures (ex: root canal therapy)
▪locate abnormalities in the soft & hard tissue
▪evaluate growth & development
▪Identify early dent caries Right Ans - •What can a dentist see on an x-ray
that he canot see with just his eyes
Film based or digitally produced recording of anatomic structures Right
Ans - What is an IMAGE (in radiology)
With radiation Right Ans - How are dental images produced
The process of recording images of the teeth & adjacent structure by exposure
to x-radiation Right Ans - What is dental radiography
•tubehead
,•extension arm
•control panel Right Ans - What are the main components of an x-ray
mashine
•it is a metal housing that contains the X-RAY TUBE
•it is filled with INSULATING OIL which prevents overheating (by absorbing
the heat created by x-ray)
•this is where the x-rays are produced
•this is where the TRANSFORMER is located. (The transformer alters the
voltage) Right Ans - Describe the tubehead & it's function
•It is an open ended lead-line cylinder that extends from the opening of the
metal housing (metal housing=tubehead) Right Ans - Describe the PID &
it's function
•LEAD COLLIMATOR - small metal disc with small opening in the center (it
form the size and shape of the x-ray beam as it leaves the tubehead & goes to
the PID)
•ALIMINUM FILTER - is 0.5mm thick. It filters out the non-penetrating, long-
wavelengths Right Ans - What are the 2 things in the PID that shape and
filter the x-ray beam
Shorter -shorter wavelengths are the MOST useful in dentistry! Right Ans -
The _________ (shorter/longer) the wavelength the GREATER the energy
Heart of the mashine= x-ray tube (it contains the cathode (-) and anode (+)
andnis vacune sealed to allow electrons to flow with minimum resistance)
•Located in tubehead Right Ans - •What is the "heart" of the x-ray
mashine?
•where is it located?
•The hollow exention arm help POSITION the tubehead to the patients cheek.
•The wires that CONNECTS the TUBEHEAD and the CONTROL PANLE are
enclosed in the extention arm. Right Ans - What is the purpose of the
extention arm
, Located: on wall outside x-ray area
-it contains: •MASTER SWITCH (turns mashine on/off)
•SELECTOR BUTTON (used to select exposure time in milliamperage (mA)
and kilovoltage (kV))
•INDICATOR LIGHT (turns orange to show that master switch is on)
•EXPOSURE BUTTON (conteols flow of electricity to generate x-rays) Right
Ans - Decribe the control panel & where is it located
Yes, it is safe to leave it on all day. It does not produce ratiation unless the
eposure button is being pressed! Right Ans - Is it safe to leave the x-ray
mashine on all day
QUALITY
•The energy or penetrating ability of the x-ray beam
•The wavelength of the beam is determined by the kilovoltage (higher
kilovoltage should be uses to produce shorter, More pentatrating wavelengths
when examining dense or thick areas)
QUANTITY
•Ampere measures the number of electrons (current flowing though cathode
filament) a low ampere ks needed in a detal unit to produce an x-ray Right
Ans - •What determins the quality & quantity of a dental radiograph
Intensity combines the number of xray photons (quantity) and the energy of
each photon (quality Right Ans - Describe intensity
Contrast= differance between shades of white, grey & black.
Radiopaque= white areas (ex: amalagam, enamel, dentin, bone)
Radiolucent= black areas (ex: cheek tissue) Right Ans - Describe contrast,
desnity and radiopaque vs. Radiolucent
•Sharpeness is how well an image is reproduced
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