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26 Cards in this Set
- Front
- Back
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causes of unexposed receptor error |
-xray machine not turned on -electrical failture -malfunction of X-ray machine |
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how to fix unexposed receptor error |
-make sure X-ray machine is on -listen for audible exposure signal |
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what does it mean when the image appears clear? |
it's an unexposed receptor |
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what happened if image appears black? |
film exposed to light |
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how to correct imagine that appeared black from light exposure |
-don't unwrap around light -check darkroom for light leaks -turn of all lights except safelight |
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what happened if image appears too dark? |
-too much exposure time -low mA -incorrect kVP -too dense |
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how to correct image from being too dark |
check exposure time, kVp, mA settings before exposing receptor |
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what happened if image appears too light? |
-receptor was underexpose -not dense enough -low mA -not enough exposure time -cone not close to face -incorrect receptor distance |
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how do we correct image that was underexposed & looks too light? |
-increase exposure time -check kVp & mA setting -check receptor distance |
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what are some periodical technique errors? |
-incorrect receptor placement -incorrect horizontal/vertical angulation -cone cut |
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what error occurred due to apices not appearing on receptor? |
-receptor not positioned in patient's mouth to cover apex region of teeth -paralleling/bisecting technique |
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how do we correct apices to show up on receptor? |
make sure no more than 1/8th of receptor edge extends pass occlusal surfaces |
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what error occurred if the occlusal plane appears tipped or tilted in the image? |
-edge of receptor was not placed parallel to incised or occlusal surface of teeth -"finger holding method" with bisecting technique |
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how to correct occlusal plane being tipped or tilted? |
make sure edge of receptor is placed parallel to incised occlusal surface of teeth |
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if image has overlapped contact, the cause is... |
central ray wasn't directed through interproximal spaces (correct paralleling techniques) |
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what do foreshortening images look like? |
short teeth w/blunted roots |
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what is the cause of foreshortening images? |
excessive vertical angulation (too steep) |
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what do elongated images look like? |
long distorted teeth |
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what is the cause of elongated images? |
-too little vertical angulation -occlusal plane is not parallel to the floor -film not against tissue -poor film placement |
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what are some BWX technique errors? |
-incorrect receptor placement -incorrect horizontal angulation -incorrect vertical angulation -cone cut with beam alignment -cone cut without beam alignment device |
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how to correctly place receptor to get premolar BWX image |
make sure anterior edge of BWX receptor is positioned at midline of mandibular canine |
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how to correctly place receptor to get molar BWX image |
make sure anterior edge of BWX receptor is positioned at midline of mandibular 2nd premolar |
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how to correct vertical angulation to prevent distorted image |
+10 degree vertical angulation |
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some miscellaneous technique errors |
-film bending & creasing -double exposure (exposing same film) -movement (blurry) -reversed film (placed backwards) |
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how much of the apex do we want to show on the radiograph? |
2-3mm |
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how much of the occlusal/incisal do we want to show on the radiograph? |
1/8th inch |
