MDS PREP
Symmetrical widening of periodontal ligament space of one or more teeth is the earliest radiological appearance of
1. Osteosarcoma
2. Multiple myeloma
3. Fibrous dysplasia
4. Paget"s disease
Radiology
Answer: 1
Symmetrical widening of the periodontal ligament space of one or more teeth is the earliest radiological appearance of osteosarcoma.
A thin radiolucent line which follows the root outline on X-rays is
1. Lamina dura
2. Periodontal ligment
3. Nutrient canal
4. Pulp
A thin radiolucent line which follows the root outline on X-rays is the periodontal ligament.
Objects which cause attenuation of X-ray beam are shown as............in image
1. Radiolucent
2. Radiopaque
3. Gray
4. None of the above
Radiology
Answer: 2
Objects which cause attenuation of X-ray beam are shown as radiopaque in an
image.
Radiopaque materials absorb or block X-rays, leading to a reduced transmission
of the X-ray beam. This results in the appearance of white areas or shadows on
the X-ray image, indicating the presence of dense structures like bone, metal
restorations, or calculi. Radiolucent structures, on the other hand, allow
X-rays to pass through more freely, resulting in dark areas on the image.
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.
Salt-paper appearance is seen in intraoral periapical radiograph of
1) Thalassaemia
2) Sjogren"s syndrome
3) Periodontal abscess
4) Osteoporosis
Radiology
Answer: 1
The "salt-paper" appearance in intraoral periapical radiographs is often associated with thalassemia due to changes in the bone structure.
In thalassaemia, particularly in the case of thalassaemia major, there can be
changes in the bone structure due to marrow hyperplasia and compensatory
changes. This can lead to a "salt-and-pepper" or "salt-paper" appearance on
radiographs, which is characterized by a mottled pattern of radiolucency and
radiopacity in the bones, including the jaw.
Osteoporosis can lead to generalized bone loss and may show decreased bone
density on radiographs
A periodontal abscess typically presents as a localized radiolucency around
the root of a tooth on radiographs
Sjogren's syndrome primarily affects the salivary and lacrimal glands,
leading to dry mouth and dry eyes
Gamma camera in Nuclear Medicine is used for
1. Organ imaging
2. Measuring the radioactivity
3. Monitoring the surface contamination
4. RIA
Radiology
Answer: 2
Gamma camera in Nuclear Medicine is used for measuring the radioactivity.
Lateral cephalogram is used for all of the following except
1. To assess where excessive growth is occuring
2. To compare the growth patterns with previous radiograph
3. To assess level of posterior alveolar bone
4. To assess soft tissue profile
Radiology
Answer: 3
A lateral cephalogram is used to assess the level of posterior alveolar bone.
Submentovertex view is best useful for
1. Sinuses
2. Zygomatic fractures
3. Mandibular fractures
4. Maxillary fractures
Radiology
Answer: 3
Submentovertex view is best useful for mandibular fractures.