sensor Placement and errors Flashcards
what helps you place the X-ray tube in the correct spot
Rinn device ( that circular thing)
what to do about sensitve patients when placing sensor
Edge ease
Mouth wash
Close slowly
Communcation
How should the chair be situated for X-rays
Upright
What color ring is for Anterior periapicals
Blue ring
How should the sensor be placed for maxillary anteriors
Rolling motion to place sensor into patients mouth
halfway back
Distal edge placed against palate
Parallel to long axis of Max anterior teeth (not up against it
what to do for added stability when doing maxillary anteriors
cotton roll under the tab
Patient hold metal positioning arm at the bend
sensor size for maillary central incisor
Size 1 placed verticak
How far should the bite blcok go for a maxillary central incors
Entire length of the biteblock to position on palate
Sensor size for max lateral inciors
Verticle size 1
Sensor size for maxillary canine
Vertical size 1
where is sensor placed for max canine
Away from teeth
How is sensor placed for mandibular anterior
Flat ontop of tongue
insert horizontally to the lower first molar region
Roll sensor upright so bend in metal bar is even with center of nostrils
should you push down on the tongue when doing mandibular anteriors
yes, acts like a coushion
How far should the ring go farward
As far as possible to his chin
sensor for mandibular central incisor
Size 1 verticle
Sensor placement for MAndibular central incisor
Behind the 2 central incisors
sensor for mandibular canine
size 1
verticle
sensor placment for Mand central incisor
Directly behind canin
how to place sensor for maxillary posterior
Retract cheek and guide sensor in mouth between 8 and 9 (vault of palate for room)
push back till level with desired teeth
angle sensor past the midline of the mouth
how far past apicies should the sensor be placed in the mouth
2-3mm
Sensor for max premolar
Size 2 horizontal
location of sensor for max premolar
away from teeth
sensor for max molar
Size 2 horizontal
location of sensor for max molar
Toward the center of plate
How to place a mandibular posterior sensor
- Retrat check and place front edge of sensor into mouth between tongue and teeth at a downward angle of 45 degrees for comfort
- slide sensor back to molar are
what to do when placing sensor if patient has tori
Edge ease
sensor for mandibular premolar
Size 2 horizontal
Location of sensor for mandibular premolar
Close to teeth
parallelto lingual surface of mandibular teeth
Sensor for mandibular molar
size 2
horizontal
Location of senor for mandibular molar
Close to teeth
parallel to lingual surface of teeth
how to place a horizontal bitewing
between tongue and teth with tab resting on teeth
wire on other side of mouth
patient closes teeth and as closing swing the front edge of the aiming device to lateral incior to open contacts
sensor for premolar bitewing
size 2 horizontal or vertical
sensor for molar bitewing
Size 2 horizontal or vertical
what do you do if sensor canot be placed parallel
USe bisecting angle technique
when is the image still adequate when angulating sensor
No greater sensor angle of 20 degrees in relation to long axis
beam directed at 90 degrees to the sensor
can a digital image be ajusted after exosure
No (several factors needed for good image)
what is critacl to a diagnositc digital image
Quality control of technical factors and sensor positioning
cause of overlap
Incorrect horizontal angulation
Cause of incisal edge not being visible
Incorrect sensor placemnt
Cause of elongation
Decreaesd vertical ingulation
Cause of foreshortening
Increased vertical angulation
cause of blurred image
Movement
Cause of cone cut
X-ray beam not centered on receptor
Cause of underexposre
less exposure
CAuse of PSP plate articats
Scratched paltes
Plates not erased
what is foreshortening and its cause
Teeth seems smaller since vertical angulation is too large
what is elongation and cause
Teeth look too long due to verttical angulation being too little
the max amount of electrons a pixel can hold
Full Well Capacity (Depends on CCD type)
the process of Oversaturating the CCD
Blooming
How does Blooming occuring
saturated pixels flow intoneighboring cells
how to stop static
moisten cotton swab with rubbing alcohol and wipe USB and sensor connection
what can static cause
Autofiring and self triggers to produce multiple blank images
Tips to maximize comfort
Set everything up before placing in patient
Start with anterior
USe cotton rolls and eddge ease
place sensor skillfully
