NDAEB Exam Questions & Answers (A+)
Periodontal disease Answer-Infection of the structures that support the teeth (gums and
bones)
Mercury, silver & tin Answer-What is amalgam fillings composed of
Periodontal disease Answer-Bone loss in the jaw is an indication of what disease
Concept of radi...
▪Identify early dent caries Answer-•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 Answer-What is an
IMAGE (in radiology)
With radiation Answer-How are dental images produced
The process of recording images of the teeth & adjacent structure by exposure to x-radiation
Answer-What is dental radiography
•tubehead
•extension arm
•control panel Answer-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) Answer-
Describe the tubehead & it's function
, NDAEB Exam Questions & Answers (A+)
•It is an open ended lead-line cylinder that extends from the opening of the metal housing
(metal housing=tubehead) Answer-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
Answer-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! Answer-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 Answer-•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. Answer-What is the purpose of the extention arm
, NDAEB Exam Questions & Answers (A+)
Located: on wall outside x-ray area
•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) Answer-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! Answer-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)
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