Receptor Mounting and Posterior Periapical Flashcards
mounting PSP plates
images mount in format created by manufacturer or clinic
highlight each image individually
make any necessary rotations to correct image orientation
viewing sequence
unerupted, missing, impacted teeth
dental caries and the size and shape of the pulp cavities
bony changes, level of alveolar bone, and calculus
roots and periapical areas
all other areas
viewing order
left side of mount
move horizontally to right side of mount
move down to mandibular perapicals on right side of mount
move horizontally to left side of mount
move to bite-wings, view from left to right
premolar images placement
required to capture the distal of the canine
molar images placement
bite block has to be in the center of the 7
horizontal angulation for premolars and molars
premolars: central beam between the 2 premolars
molars: central beam between 6 and 7
if a patient has a partial denture or a complete denture in one of the arches
appliance can be used to help support the biteblock when the patient closes
only used in opposite arch
partial dentures taken out
mandibular tori
place receptor between torus and the tongue
do not rest the receptor on top of the torus
digital radiography
a filmless imaging system that captures a radiographic image using sensors or plates, digitizes the image and then displays and stores it on a computer
conventional vs digital radiography
conventional:
images - continuous spectrum of gray shades between black and white
dental film used
chemical processing
digital:
images - array of pixels with discrete gray values
sensor/plate used
analog information converted to digital image to view on computer
exposure times are ______ than that required for conventional radiography using E-speed film
less
indirect/phosphor plates
similar to film
plates must be processed
storage phosphor imaging
direct sensors
a sensor is placed in the mouth
image data is transmitted directly to the computer for immediate viewing
direct digital imaging components
x-ray machine, intraoral sensor, computer monitor
intraoral sensor/receptor
a small detector that is placed in the mouth of the patient and used to capture the radiographic image
wired or wireless
types of direct digital sensors
charge-coupled device
complementary metal oxide semiconductor
charge injection device
charge-coupled device (CCD) characteristics
most common
solid-state detector that contains a silicon chip with an embedded electronic circuit
electrons make pixels
how do charge-coupled devices work
x-ray photons contact the CCD and electrons are released from the silicon and produce a corresponding electronic charge
CCD disadvantages
thicker
less tolerated
sensor placement more difficult
cable easily damaged
infection control
indirect digital imaging components
PSP plates, x-ray machine, scanner, a computer
PSP plates
flexible polyester base coated with crystalline emulsion of europium-activated barium fluorohalide compound
how the PSP imaging works
incoming x-ray energy stored in emulsion
latent image form on plate
plate is removed from patient’s mouth
plate is placed in a laser scanner
laser beam scans the plate
stored electrons are released as visible light
disadvantages of PSP plates
plates need to be replaced every 50-200 uses
need scanner in a dark space
time delay
overall advantages of digital imaging
- superior image resolution
- reduced patient exposure
- increased speed of image viewing
- lower equipment; supply costs
- increased efficiency
- enhancement options for images
- effective client education tool
- eco-friendly
