MDS PREP
Green film after processing is due to
1. Film placed in fixer solution first
2. High temperature difference of solution
3. Film emulsion not in contact with processing solution
4. Presence of rare earth elements in film
Green film after processing is due to the film emulsion not being in contact with the processing solution.
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.
To localize a supernumerary or an impacted tooth and determine its exact relationship to the other teeth, which of the following radiographs would be most effective?
1. A periapical and an occlusal view
2. An occlusal view using a high angle
3. A panoramic radiograph
4. Two or more periapical views at different angles and an occlusal view
Radiology
Answer: 4
To localize a supernumerary or an impacted tooth and determine its exact relationship to the other teeth, the most effective radiographs would be two or more periapical views at different angles and an occlusal view.
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.
The ingredient of the fixing solution of the X-ray is
1) Hydroquinone
2) Elon
3) Sodium bisulphate
4) Acetic acid
Radiology
Answer: 4
Acetic acid is a key ingredient in the fixing solution used in radiography. It acts as a stop bath, neutralizing the developer and maintaining the acidic environment necessary for proper fixation. Hydroquinone and elon are developer agents, while sodium bisulfate is not typically part of the fixing process.
Lateral skull view is used for viewing all of the following except
1. Medial wall and root of orbit
2. Nasal bone
3. Nasal septum
4. Calvarium and root of sinus
Radiology
Answer: 3
Lateral skull view is used for viewing all of the following except nasal septum.
Asymptomatic mixed radiopaque and radiolucent lesions found at the lower incisor region of a middle aged women may be
1. Periapical cysts
2. Cementoblastoma
3. Cementoma
4. Odontogenic cysts
Radiology
Answer: 3
Asymptomatic mixed radiopaque and radiolucent lesions found at the lower incisor region of a middle-aged woman may be cementoma.
If shorter exposure time is needed for exposing dental firm
1. kVp can be increased
2. Mili ampere is decreased
3. Long cone can be used
4. Lead diaphragm is removed
Radiology
Answer: 1
If shorter exposure time is needed for exposing dental film, kVp can be increased.