Receptor Mounting and Posterior Periapical

Question 1

mounting PSP plates

Answer 1

images mount in format created by manufacturer or clinic
highlight each image individually
make any necessary rotations to correct image orientation

Question 2

viewing sequence

Answer 2

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

Question 3

viewing order

Answer 3

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

Question 4

premolar images placement

Answer 4

required to capture the distal of the canine

Question 5

molar images placement

Answer 5

bite block has to be in the center of the 7

Question 6

horizontal angulation for premolars and molars

Answer 6

premolars: central beam between the 2 premolars
molars: central beam between 6 and 7

Question 7

if a patient has a partial denture or a complete denture in one of the arches

Answer 7

appliance can be used to help support the biteblock when the patient closes
only used in opposite arch
partial dentures taken out

Question 8

mandibular tori

Answer 8

place receptor between torus and the tongue
do not rest the receptor on top of the torus

Question 9

digital radiography

Answer 9

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

Question 10

conventional vs digital radiography

Answer 10

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

Question 11

exposure times are ______ than that required for conventional radiography using E-speed film

Answer 11

less

Question 12

indirect/phosphor plates

Answer 12

similar to film
plates must be processed
storage phosphor imaging

Question 13

direct sensors

Answer 13

a sensor is placed in the mouth
image data is transmitted directly to the computer for immediate viewing

Question 14

direct digital imaging components

Answer 14

x-ray machine, intraoral sensor, computer monitor

Question 15

intraoral sensor/receptor

Answer 15

a small detector that is placed in the mouth of the patient and used to capture the radiographic image
wired or wireless

Question 16

types of direct digital sensors

Answer 16

charge-coupled device
complementary metal oxide semiconductor
charge injection device

Question 17

charge-coupled device (CCD) characteristics

Answer 17

most common
solid-state detector that contains a silicon chip with an embedded electronic circuit
electrons make pixels

Question 18

how do charge-coupled devices work

Answer 18

x-ray photons contact the CCD and electrons are released from the silicon and produce a corresponding electronic charge

Question 19

CCD disadvantages

Answer 19

thicker
less tolerated
sensor placement more difficult
cable easily damaged
infection control

Question 20

indirect digital imaging components

Answer 20

PSP plates, x-ray machine, scanner, a computer

Question 21

PSP plates

Answer 21

flexible polyester base coated with crystalline emulsion of europium-activated barium fluorohalide compound

Question 22

how the PSP imaging works

Answer 22

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

Question 23

disadvantages of PSP plates

Answer 23

plates need to be replaced every 50-200 uses
need scanner in a dark space
time delay

Question 24

overall advantages of digital imaging

Answer 24

1. superior image resolution
2. reduced patient exposure
3. increased speed of image viewing
4. lower equipment; supply costs
5. increased efficiency
6. enhancement options for images
7. effective client education tool
8. eco-friendly

Question 25

overall disadvantages of digital imaging

Answer 25

1. initial set-up costs
2. image quality
3. sensor size