MDS PREP
The scientist who discovered that caries was the most common cause of extraction of teeth was
1. Allen
2. Smith
3. Hotz
4. Rush
Radiology
Answer: 1
The scientist who discovered that caries was the most common cause of extraction of teeth was Allen.
Sharpness of image on the film can be increased by
1. Large focal spot
2. Small focal spot
3. Decreased target-skin distance
4. Increased film-object distance
Radiology
Answer: 2
Sharpness of the image on the film can be increased by using a small focal spot.
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.
Internal derangement of the TMJ can be best diagnosed by
1. MRI
2. CT scan
3. Arthrography
4. Panoramic view
Radiology
Answer: 1
Internal derangement of the TMJ can be best diagnosed by MRI.
Location and radiographic density make a talon cusp appear similar to
1) Delacerations
2) Concrescence
3) A supernumerary tooth
4) Dens in dente
Radiology
Answer: 3
1. Anodontia: This is the complete absence of teeth. It is a rare condition
where an individual fails to develop any teeth.
2. Oligodontia: This term is used when an individual has fewer teeth than the
typical dental formula, which is six incisors, two canines, two premolars, and
six molars in the permanent dentition (excluding the third molars or wisdom
teeth). The term "hypodontia" is often used synonymously with oligodontia, but
hypodontia can also refer to a broader range of conditions characterized by the
congenital absence of one or more teeth, whereas oligodontia is more
specifically the absence of six or more teeth.
3. Microdontia: This condition involves teeth that are smaller than normal. It
can affect either the primary or permanent dentition and may involve one tooth
or multiple teeth.
4. Dens in dente: This is a rare developmental anomaly where a tooth forms
within the dental crown of another tooth, typically in the form of a small
tooth-like structure. It is not a condition of tooth number but rather an
abnormality of tooth structure.
Base of skull can be viewed by
1. Towne"s projection
2. Submentovertex
3. PA view of skull
4. Both A and B
Radiology
Answer: 4
The base of the skull can be viewed by both Towne's projection and Submentovertex.
In reverse Townes projection central X-ray passess through
1. Maxillary sinus
2. Occipital bone
3. Buperior border of petrous
4. Inferior border of petrous
Radiology
Answer: 2
In reverse Townes projection, the central X-ray passes through the occipital bone.
Brown discolouration seen in old radiographic films is due to
1. Overdevelopment
2. Underdevelopment
3. Incomplete fixation
4. Exposure to light
Radiology
Answer: 3
Brown discoloration seen in old radiographic films is due to incomplete fixation.