# Which factor results in parallax "unsharpness"?

 # Which factor results in parallax "unsharpness"?

a) Quantum mottle.
b) Size and number of silver halide grains.
c) Object, film, or x-ray source movement.
d) Image magnification on double-emulsion film.

The correct answer is D. Image magnification on double emulsion film.

Quantum mottle is caused by a fluctuation in the number of photons absorbed by the fast film-intensifying screen combination. Object, film, or x-ray source movement can all cause image "unsharpness" that appears blurry. The size and number of silver halide grains contribute to image receptor blurring. Parallax "unsharpness" occurs because the double-emulsion film records a slight magnification of the image on the side of the film away from the x-ray source.

Click here for more MCQs

Bright Line Dental Care, Kuleshwor, Nayabasti, Kathmandu

Name of Dental Clinic: Bright Line Dental Clinic

Address: Kuleshwor Nayabasti 14, Kathmandu, Nepal

Year of Establishment: 2077 B.S

Name of the chief Dental Surgeon: Dr. Swostik Devkota

CONTACT NUMBER: 9779860218227

CLICK HERE TO VIEW ALL DENTAL CLINICS OF BAGMATI PROVINCE

PMA index is used to record the status of:

 # PMA index is used to record the status of:

A. Gingival diseases

B. Carious teeth

C. Root caries

D. Periodontal disease

The correct answer is A. Gingival diseases.

The first dental index, developed by Schour and Massler, was known as a Papilla, Marginal gingiva and Attached gingiva (PMA) Index. Each of those areas was examined and scored from 0 to 5, depending on the severity of inflammation. The PMA Index, largely of historic interest now, was primarily used in surveys of acute gingivitis. The status of a patient’s periodontal health or disease is commonly measured by an index in private practices.

CLICK HERE FOR MORE MCQs

Prosthesis in which a pontic is attached to a single side retainer via connector is called

 # Prosthesis in which a pontic is attached to a single side retainer via connector is called as:

A. Removable fixed partial denture

B. Removable partial denture

C. Fixed partial denture

D. Cantilever fixed partial denture

The correct answer is D. Cantilever fixed partial denture.

A cantilever fixed partial denture is one that has an abutment or abutments at one end only, with the other end of the pontic remaining unattached. This is a potentially destructive design with the lever arm created by the pontic, and it is frequently misused.

Prospective abutment teeth for cantilever fixed partial dentures should be evaluated with an eye toward lengthy roots with a favorable configuration, long clinical crowns, good crown-root ratios, and healthy periodontium. Generally, cantilever fixed partial dentures should replace only one tooth and have at least two abutments.

A cantilever can be used for replacing a maxillary lateral incisor. There should be no occlusal contact on

the pontic in either centric or lateral excursions. The canine must be used as an abutment, and it can serve in the role of solo abutment only if it has a long root and good bone support.

CLICK HERE FOR MORE MCQs

Prosthodontics MCQs - Which of the following is not used with the surveyor?

 # Which of the following is not used with the surveyor?

A. Incisal guide pin

B. Analyzing rod

C. Carbon marker

D. Wax trimmer

The correct answer is: A. Incisal guide pin.

Incisal guide pin is used with an articulator not a surveyor.

Surveying tools- These are tools attached the the madrel of the surveying arm and are used for surveying. They are of different types, e.g. analyzing rod, carbon marker, wax knife and undercut gauges. 

Analyzing rod- First tool to be used in surveying. It is more of a diagnostic survey tool. It helps to analyze the location of the height of contours, the presence and absence of favorable and unfavorable undercuts and is used to determine the parallelism of one surface to another. It also helps to arbitrarily determine the path of insertion. 

Carbon marker- The resultant line formed by the scribe (carbon marker) is known as a survey line. These survey lines help us in positioning the various component parts of a removable partial denture (RPD). 

Undercut gauges- A gauge is a high precision instrument used to measure the linear dimension of any structure. Undercut gauges are used to measure the depth and location of the undercuts on the analysed tooth in three dimensions. 

Wax Knife- Is used to eliminate or block out undesirable undercut areas with wax on the cast. 

CLICK HERE FOR MORE MCQs

T:B lymphocyte ratio in GCF is:

# T:B lymphocyte ratio in GCF is:

A. 1:3

B. 2:1

C. 3:1

D. 1:1

The correct answer is A. 1:3

The ratio of T lymphocytes to B lymphocytes was found to be reversed from the normal ratio of about 3:1 found in peripheral blood to about 1:3 in GCF. 

Ref: Carranza's Clinical Periodontology, 12th Edition, Page no 216.

CLICK HERE FOR MORE MCQs

Posterior vibrating line is at the junction of:

#  Posterior vibrating line is at the junction of:

A. Levator palatini and tensor palatini

B. Levator palatini and muscular portion of the soft palate

C. Aponeurosis of levator palatini and muscular portion of the soft palate

D. Aponeurosis of tensor palatini and muscular portion of soft palate

The correct answer is D. Aponeurosis of tensor palatini and muscular portion of soft palate.

Posterior vibrating line It is an imaginary line located at the junction of the soft palate that shows limited movement and the soft palate that shows marked movement. It also represents the junction between the aponeurosis of the tensor veli palatini muscle and the muscular portion of the soft palate. It is recorded by asking the patient to say “ah’ in short but normal nonvigorous fashion. This line is usually straight.

CLICK HERE FOR MORE MCQs