MDS PREP
Waters projection is useful for eveluating
1. Frontal and ethmoidal sinuses
2. Maxillary sinus
3. Zygomaticofrontal suture and nasal cavity
4. All of the above
Radiology
Answer: 4
Waters projection is useful for evaluating all of the above: frontal and ethmoidal sinuses, maxillary sinus, zygomaticofrontal suture and nasal cavity.
Horizontal unfavourable or favourable fractures of mandible can be viewed best in
1. Lateral oblique 30 degrees
2. Lateral oblique 15 degrees
3. PA view of mandible
4. Submentovertex view
Radiology
Answer: 1
Horizontal unfavourable or favourable fractures of the mandible can be viewed best in lateral oblique 30 degrees.
In order to determine anterior-posterior extent of ameloblastma in mandibular molar area, you would like to use following projection
1. Waster view
2. PA view of mandible
3. Distal oblique
4. Lateral oblique view
Radiology
Answer: 3
To determine the anterior-posterior extent of ameloblastoma in the mandibular molar area, the projection used is distal oblique.
Which of the following statements about developing a dental radiograph is false?
1) It involves chemically precipitating metallic silver
2) It it is too long, it results in an over dark radiograph
3) It typically involves a developer containing sodium thiosulphate
4) None of the above
Radiology
Answer: 2
Explanation: This statement is false because if the developing time is too long, it typically results in an overexposed radiograph, which appears too dark. However, if the developing time is too short, it can lead to an underexposed radiograph, which appears too light.
In the bisecting technique, the film is placed
1. Parallel to the tooth
2. As close as possible
3. Parallel to the bisector
4. Perpendicular to the bisector
Radiology
Answer: 2
In the bisecting technique, the film is placed as close as possible to the tooth.
For detection of pathology in both Stenson"s and Wharton"s duct after sialogram, indicated radiographic view is
1. PA view
2. Caldwell
3. Panoramic
4. CT scan
Radiology
Answer: 3
For detection of pathology in both Stenson's and Wharton's duct after sialogram, the indicated radiographic view is panoramic.
The following produces highest radiation exposure
1. CT scan
2. MRI
3. Pantamograph
4. Arthrograms
Radiology
Answer: 4
The following produces the highest radiation exposure: arthrograms.
Double intensifying screen and screen film are used in extraoral radiographs to
1. Reduce density
2. Reduce contrast
3. Reduce exposure time
4. Reduce secondary radiation
Radiology
Answer: 3
Double intensifying screen and screen film are used in extraoral radiographs to reduce exposure time.