Roent Exam Questions & Answers 2024/2025
the quantity of radiation produced is controlled by what factor or factors? - ANSWERSmilliamperage (mA) and exposure time.
- mA controls the quantity and number of xrays produced.
- exposure time...length of time xrays are produced and patient is ex...
the quantity of radiation produced is controlled by what factor or factors? - ANSWERSmilliamperage
(mA) and exposure time.
- mA controls the quantity and number of xrays produced.
- exposure time...length of time xrays are produced and patient is exposed to them.
- kilovoltage affects the quality (ie penetrating power) fo the beam.
state the generally acceptable ranges of controllable factors on an dental xray machine. - ANSWERS65-
100 kVp and 7-15 mA
- some xray machines are calibrated in impulses (ie 60 impulses in 1 second)
what controls the density of a radiograph? - ANSWERSdensity is the darkness (blackness) of a
radiograph.
density will increase as mA and kVp or exposure time is increased.
do you prefer high or low contrast on your xray? - ANSWERSLOW contrast is ideal. High contrast means
there is a large difference in the degrees of blackness between adjacent areas on a radiograph. In
dentistry, many shades of gray are preferred...so lwo contrast is preferred. high contrast would give veyr
dark and very light areas.
A higher kVp (and proper filtration) have a role here. A higher kVp produces more shades of gray or low
contrast.
,A radiograph is shown ......structures we should idenifty include: floor of nasal fossa, lateral wall in the
nasopalatine canal, ala of nose, anterior wall of maxillary sinus, maxillayr sinus, and a lingual cusp of a
premolar. - ANSWERS- lingual cusp appears shorter than the buccal cusp on premolar.
The inverse square law is? - ANSWERS...for a given beam of radiation the intensity is inversely
proportional to the square of hte distance from teh source of the radiation.
- the xray beam "spreads" out....it becomes less intense.
- orig intenisty * orig distance squared = new intensity * new distance squared
- when we are talking about energy we are talking about the energy of the neutrons.
- ie the PID length changes from 8 to 16 inches the intensity of resultant beam is 1/4th as intense. if you
half the distance....the beam is four times as intense.
a partial panorex is shown:
the following are items you may need to identify: - ANSWERS- lateral wall of nasal foss which is also the
medial wall of the maxillary sinus.
- border of the infraorbital canal
- pterygomaxillary fissure
-pterygoid spine of hte sphenoid bone
- posterior wall fo the maxillary sinus
- anterior nasal spine.
- hyoid bone
a PA of the mandibular premolar region -
name some items you may need to identify: - ANSWERS- PDL space
- mental foramen
- submandibular gland fossa (a large radiolucent area kind of under the 1st mandibular molar)
, - just a dark dot which is hte film clip mark for traditional radiography.
A PA of the mandibula rincisor region is shown -
name some items you may need to identify. - ANSWERS- lingual cusp of a 1st premolar
- pdl space
- film holders
- genial tubercles - an opaque mass around the lingual foramen.
- bony trabecular plate (if it is an opaque line just in the bone)
- marrow space (a radiolucent space just in the bone)
A PA of the maxillary molar region is shown -
name some items you may need to identify: - ANSWERS- anterior wall and floor of maxxillary sinus.
- inferior concha (looks like radiopaque mass at top of film.... i thought it might be the zygoma?)
- floor of nasal fossa (to me looks like the roof of the maxillary sinus)
- inferior border and posterior wall of the zygomatic process of the maxillar.
- inferior border of the zygoma (zygomatic arch) --- kinda before the maxillary tuberosity on the 2nd max
molar)
- floor of maxillary sinus ....which is lateral to the posterior wall of the zygomatic proces of the maxilla....
- mucosa over the maxillary alveolar ridge
A PA of mandibualr molar region is shown -
name some items you may need to identify: - ANSWERS- a nutrient canal- jus ta small canal..boney
pattern ... to the apex of the tooth.
- bony trabecular plate
- inferior border of the mandibular canal.
- submandibular gland fossa ( a radiolucent space on the mandible, pretty far apical, kinda under the
second molar)
- inferior border of the mandible.
another partial panoramic radiograph is shown:
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