MDS PREP
Intensifying screen is used in extraoral radiograph to
1. Decrease patient radiation
2. Increase contrast
3. Decrease contrast
4. Collimation
Radiology
Answer: 1
Intensifying screen is used in extraoral radiographs to decrease patient radiation.
Which of the following is a possible cause for a low density radiograph
(light film?)
1. Cold developer
2. over exposure
3. Improper safety light
4. Excessive developing time
Radiology Answer: 1
Overexposure typically results in a darker film, not a lighter one. An improper safety light or excessive developing time would not directly cause a low density radiograph. It is essential to maintain the correct temperature and time in the developing process to achieve a diagnostic image quality. A cold developer will not fully develop the film, leading to a lighter, less detailed image.
Fogging of X-ray film affects the contrast of an intraoral film because it
1. Produces phosphorous crystals on the film
2. Decreases film density resulting in a light radiograph
3. Produces white speckles on the firm
4. Increases film density resulting in an overall gray radiograph
Fogging of X-ray film affects the contrast of an intraoral film because it increases film density resulting in an overall gray radiograph.
The best image obtained if duplicating film is exposed tp
1. X-rays
2. UV rays
3. Visible light
4. Infrared light
Radiology
Answer: 2
The best image obtained if duplicating film is exposed to UV rays.
In which TMJ view central X-ray passes through sigmoid notch
1. Infracranial
2. Frontal view
3. Transcranial
4. Transorbital
Radiology
Answer: 1
In the TMJ view, the central X-ray passes through the sigmoid notch in the infracranial view.
A thin radioopaque line running around the curvature of root in IOPA is
1. Lamina dura
2. Lamina propria
3. Lamina limitans
4. Lamina densa
Radiology
Answer: 1
A thin radiopaque line running around the curvature of the root in IOPA is lamina dura.
Minimal dentinal destruction to get evident on the radiograph
1) 30 microns
2) 40 microns
3) 200 microns
4) 300 microns
Radiology
Answer: 2
Radiographic detection of carious lesions or dentinal destruction typically requires a certain threshold of loss of tooth structure. Studies have shown that a loss of approximately 40 microns of dentin is necessary for a radiograph to show evidence of carious lesions.
Best radiograph for viewing # of maxillary bone
1. Submentovertex
2. PA view
3. Waters view
4. Towne"s projection
Radiology
Answer: 3
The best radiograph for viewing the maxillary bone is Waters view.