FREE NDEB Dental Sciences Questions and Answers

Question 1

A patient has a history of radiation therapy for thyroid cancer.
Three weeks after an extraction, there is increasing pain and a non-healing extraction socket with exposed sequestrated bone.
The most likely diagnosis is _________:

Accepted Answer

osteoradionecrosis.

Answer

alveolar osteitis

Answer

metastatic thyroid cancer

Answer

epulis granulomatosa

Question 2

Which of the following is the most common cause of fracture of nickel-titanium (NiTi) rotary endodontic instruments?

Accepted Answer

Torsional stresses that are too high.

Answer

NiTi files that are too small in diameter.

Answer

Rotational speed that is too slow.

Answer

NiTi files that have too little taper.

Question 3

When prescribing codeine, patients should be informed ________:

Accepted Answer

to avoid consuming alcohol.

Answer

to complete the prescribed course.

Answer

that it may cause diarrhea.

Answer

that it may cause hypertension.

Question 4

Dental porcelain has ________:

Accepted Answer

high hardness and low impact strength.

Answer

low hardness and low impact strength.

Answer

low hardness and high impact strength.

Answer

high hardness and high impact strength.

Question 5

An SNA of 88˚ most likely indicates a maxilla positioned ________:

Accepted Answer

anteriorly.

Answer

posteriorly.

Answer

normally.

Question 6

Disinfection is a process that ______:

Accepted Answer

reduces the number of microorganisms.

Answer

decreases the viral load to safe levels.

Answer

selectively reduces Gram-positive microorganisms.

Answer

eradicates pathogenic viruses.

Question 7

Arterial blood flows continuously through capillaries during both systole and diastole because ________:

Accepted Answer

arterioles can regulate their diameters.

Answer

arteries possess compliant walls.

Answer

veins possess valves on their inner surface.

Answer

the beating heart spends more time in diastole than in systole.

Answer

blood undergoes laminar flow through capillary beds

Question 8

Plaque becomes more cariogenic when ________:

Accepted Answer

acidogenic bacteria and fermentable carbohydrate are present.

Answer

Streptococcus sanguis predominates

Answer

pyogenic organisms predominate

Answer

it has become heavily calcified.

Question 9

Surface enamel is more highly mineralized than the rest of the enamel because _______:

Accepted Answer

crystallites are deposited parallel to the surface.

Answer

older ameloblasts produce more amelogenins.

Answer

surface enamel is prismless.

Answer

older ameloblasts digest protein more efficiently.

Question 10

A facial nerve injury at the stylomastoid foramen will result in _______:

Accepted Answer

loss of taste sensation from the anterior 2/3 of the tongue.

Answer

no loss of motor innervation to the orbicularis oculi.

Answer

no loss of innervation to the posterior belly of the digastric muscle.

Answer

no loss of parasympathetic innervation to the lacrimal gland.

A patient has a history of radiation therapy for thyroid cancer.Three weeks after an extraction, there is increasing pain and a non-healing extraction socket with exposed sequestrated bone.The most likely diagnosis is _________:

A patient has a history of radiation therapy for thyroid cancer.
Three weeks after an extraction, there is increasing pain and a non-healing extraction socket with exposed sequestrated bone.
The most likely diagnosis is _________: