DHYG 1304 - Final Exam Review Questions and Answers Already Passed
Not recording the apical structures is a _____ error - Answers technique error
Probable cause for not recording apical structures: - Answers -image receptor not place
high/low enough
-patient didn't occlude completely
-inadequate vertical angulation
Corrective actions for not recording apical structures: - Answers -ensure receptor is positioned
correctly and patient is biting down all of the way (tip receptor into midline of mouth)
-increase vertical angulation no greater than 15 degrees
Cutting off incisial/occlusal surface is a _____ error - Answers technique error
Probable cause of cutting off incisial/occlusal surface: - Answers excessive vertical angulation
Corrective actions of cutting off incisal/occlusal surface: - Answers decrease angulation no
greater than 15 degrees
Dark images is a _____ error - Answers technique error and processing error
Probable causes of dark images (technique error): - Answers -excessive exposure time
(overexposure)
-rarely the result of equipment malfunction
Probable causes of dark images (processing error): - Answers -film is left in the developer too
long
-incorrectly mixing the developer (too strong)
Corrective action for dark images (technique error): - Answers decrease the exposure settings
Light images is a _____ error - Answers technique error and processing error
Probable cause of light images (technique error): - Answers -check for reversed film error
-insufficient exposure time
-failure to press exposure button for full duration
-rarely the result of equipment malfunction
Probable cause for light images (processing error): - Answers -film is not left in developer long
enough
, -incorrectly mixing developer solution (too weak)
Corrective actions for light images (technique error): - Answers increase exposure setting
Overlapping is a _____ error - Answers technique error
Probable causes of overlapping: - Answers -incorrect rotation of the tube head and PID in the
horizontal plane
-not positioning the image receptor parallel to the interproximal spaces of the teeth
Corrective actions for overlapping: - Answers -examine to determine if overlap is more sever in
anterior or posterior region (to correct mesiodistal overlap, rotate tube head and PID to direct
central rays more toward anterior teeth)
-place image receptor parallel to contact points of teeth
Elongation is a _____ error - Answers technique error
Probable cause of elongation: - Answers insufficient vertical angulation
Corrective actions for elongation: - Answers increase vertical angulation
Foreshortening is a _____ error: - Answers technique error
Probable cause of foreshortening: - Answers excessive vertical angulation
Corrective actions for foreshortening: - Answers decrease vertical angulation
Brown film is a _____ error - Answers processing error
Probable causes of brown film: - Answers insufficient washing, chemicals remain on surface
and erode the image
Corrective actions for brown film: - Answers -rinse films for at least 20 minutes
-make sure water supply is full and turned one
Clear/blank film is _____ error - Answers technique error and processing error
Probable cause of clear/blank film (technique error): - Answers -no exposure to x-rays
-incorrect side of PSP plate or sensor exposed
-equipment malfunction
Probable cause of clear/blank film (processing error): - Answers -accidentally placed in fixer
before developer
Not recording the apical structures is a _____ error - Answers technique error
Probable cause for not recording apical structures: - Answers -image receptor not place
high/low enough
-patient didn't occlude completely
-inadequate vertical angulation
Corrective actions for not recording apical structures: - Answers -ensure receptor is positioned
correctly and patient is biting down all of the way (tip receptor into midline of mouth)
-increase vertical angulation no greater than 15 degrees
Cutting off incisial/occlusal surface is a _____ error - Answers technique error
Probable cause of cutting off incisial/occlusal surface: - Answers excessive vertical angulation
Corrective actions of cutting off incisal/occlusal surface: - Answers decrease angulation no
greater than 15 degrees
Dark images is a _____ error - Answers technique error and processing error
Probable causes of dark images (technique error): - Answers -excessive exposure time
(overexposure)
-rarely the result of equipment malfunction
Probable causes of dark images (processing error): - Answers -film is left in the developer too
long
-incorrectly mixing the developer (too strong)
Corrective action for dark images (technique error): - Answers decrease the exposure settings
Light images is a _____ error - Answers technique error and processing error
Probable cause of light images (technique error): - Answers -check for reversed film error
-insufficient exposure time
-failure to press exposure button for full duration
-rarely the result of equipment malfunction
Probable cause for light images (processing error): - Answers -film is not left in developer long
enough
, -incorrectly mixing developer solution (too weak)
Corrective actions for light images (technique error): - Answers increase exposure setting
Overlapping is a _____ error - Answers technique error
Probable causes of overlapping: - Answers -incorrect rotation of the tube head and PID in the
horizontal plane
-not positioning the image receptor parallel to the interproximal spaces of the teeth
Corrective actions for overlapping: - Answers -examine to determine if overlap is more sever in
anterior or posterior region (to correct mesiodistal overlap, rotate tube head and PID to direct
central rays more toward anterior teeth)
-place image receptor parallel to contact points of teeth
Elongation is a _____ error - Answers technique error
Probable cause of elongation: - Answers insufficient vertical angulation
Corrective actions for elongation: - Answers increase vertical angulation
Foreshortening is a _____ error: - Answers technique error
Probable cause of foreshortening: - Answers excessive vertical angulation
Corrective actions for foreshortening: - Answers decrease vertical angulation
Brown film is a _____ error - Answers processing error
Probable causes of brown film: - Answers insufficient washing, chemicals remain on surface
and erode the image
Corrective actions for brown film: - Answers -rinse films for at least 20 minutes
-make sure water supply is full and turned one
Clear/blank film is _____ error - Answers technique error and processing error
Probable cause of clear/blank film (technique error): - Answers -no exposure to x-rays
-incorrect side of PSP plate or sensor exposed
-equipment malfunction
Probable cause of clear/blank film (processing error): - Answers -accidentally placed in fixer
before developer
