NDAEB exam Questions &
Answers(GRADED A+)
Periodontal disease - ANSWERInfection of the structures that support the teeth
(gums and bones)
Mercury, silver & tin - ANSWERWhat is amalgam fillings composed of
Periodontal disease - ANSWERBone 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" - ANSWERWhat is the ALARA concept
Positive - Anode
Negative-Cathode - ANSWERWhat is the positive & negavtove electrode in the x-ray
tube
Film, phosphorous storage plate, digital sencor - ANSWERWhat are examples of
inage receptors
•To help the dentist see conditions in the mouth not visitble to the eye -
ANSWER•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 - 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 - ANSWERWhat is
an IMAGE (in radiology)
With radiation - ANSWERHow are dental images produced
The process of recording images of the teeth & adjacent structure by exposure to x-
radiation - ANSWERWhat is dental radiography
•tubehead
•extension arm
•control panel - ANSWERWhat 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) -
ANSWERDescribe 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) - ANSWERDescribe 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 - ANSWERWhat are the 2 things in the PID that shape and filter the x-
ray beam
, Shorter -shorter wavelengths are the MOST useful in dentistry! - ANSWERThe
_________ (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. - ANSWERWhat 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) -
ANSWERDecribe 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! - ANSWERIs 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 -
ANSWER•What determins the quality & quantity of a dental radiograph
Intensity combines the number of xray photons (quantity) and the energy of each
photon (quality - ANSWERDescribe intensity
Contrast= differance between shades of white, grey & black.
Radiopaque= white areas (ex: amalagam, enamel, dentin, bone)
Radiolucent= black areas (ex: cheek tissue) - ANSWERDescribe contrast, desnity
and radiopaque vs. Radiolucent
•Sharpeness is how well an image is reproduced
•Penumbra - fuzz or blured area around an image - ANSWERDescribe sharpness
and penumbra
•magification =the proportional elarment of a dental image
Answers(GRADED A+)
Periodontal disease - ANSWERInfection of the structures that support the teeth
(gums and bones)
Mercury, silver & tin - ANSWERWhat is amalgam fillings composed of
Periodontal disease - ANSWERBone 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" - ANSWERWhat is the ALARA concept
Positive - Anode
Negative-Cathode - ANSWERWhat is the positive & negavtove electrode in the x-ray
tube
Film, phosphorous storage plate, digital sencor - ANSWERWhat are examples of
inage receptors
•To help the dentist see conditions in the mouth not visitble to the eye -
ANSWER•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 - 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 - ANSWERWhat is
an IMAGE (in radiology)
With radiation - ANSWERHow are dental images produced
The process of recording images of the teeth & adjacent structure by exposure to x-
radiation - ANSWERWhat is dental radiography
•tubehead
•extension arm
•control panel - ANSWERWhat 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) -
ANSWERDescribe 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) - ANSWERDescribe 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 - ANSWERWhat are the 2 things in the PID that shape and filter the x-
ray beam
, Shorter -shorter wavelengths are the MOST useful in dentistry! - ANSWERThe
_________ (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. - ANSWERWhat 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) -
ANSWERDecribe 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! - ANSWERIs 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 -
ANSWER•What determins the quality & quantity of a dental radiograph
Intensity combines the number of xray photons (quantity) and the energy of each
photon (quality - ANSWERDescribe intensity
Contrast= differance between shades of white, grey & black.
Radiopaque= white areas (ex: amalagam, enamel, dentin, bone)
Radiolucent= black areas (ex: cheek tissue) - ANSWERDescribe contrast, desnity
and radiopaque vs. Radiolucent
•Sharpeness is how well an image is reproduced
•Penumbra - fuzz or blured area around an image - ANSWERDescribe sharpness
and penumbra
•magification =the proportional elarment of a dental image
