Most common reason for a crown not to fully seat upon delivery

# What is the most common reason for a crown not to fully seat upon delivery?
A. Excessive proximal contacts
B. Over extended margins
C. Undercuts on the axial surfaces of the prepared
tooth
D. Positives on the intaglio surface

The correct answer is A. Excessive proximal contacts. 

Excessive proximal contacts are sometimes accidentally made by dental technicians effort to prevent open contacts on their fabricated dental crown/ bridge.

The respective tooth preparations on the

die casts are sawed to separate each component and provide better visualization

of the prep. Dental technicians may accidentally scrape a portion of the contact

area of the adjacent teeth causing a future

excessive contact in the final crown restoration.

Excessive contacts can also be created

when wax patterns are not immediately

invested, causing dimensional changes in

the final restoration.

Which of the following organisms is an intracellular parasite

# Which of the following organisms is an intracellular parasite?
A. Nocardia asteroides
B. Coccidioides immitis
C. Histoplasma capsulatum
D. Aspergillus flavus
E. Cryptococcus neoformans

The correct answer is C. Histoplasma capsulatum.

Histoplasma capsulatum is a type of fungi
which is the main cause of histoplasmosis
infection. This is an intracelular parasite of
macrophages that commonly causes
fungal respiratory infection in the US.

Acute arthritis of the great (big) toe is a diagnostic sign

# Acute arthritis of the great (big) toe is a diagnostic sign of which of the following diseases?
A. Osteoarthritis
B. Osteomyelitis
C. Gout
D. Osteoporosis
E. Rheumatoid arthritis

The correct answer is C. Gout. 

The acute arthritis of the big toe is a

pathognomonic sign of Podagra or Gout.

What distinguishes Gout from others is that,

it usually occurs in one of the joints in the

body, however, about 50% are said to occur

in the big toe. This disease is also referred

to as "disease of the kings" or "the rich

man's disease".

Chemotherapy for Leukemia

# A patient receiving chemotherapy for leukemia is highly susceptible to develop which oral infection?
A. Candidiasis
B. Actinomycosis
C Histoplasmosis
D. Coccidioidomycosis
E. Blastomycosis

The correct answer is A. Candidiasis. 

Immunocompromised patients are more susceptible to candidiasis, the fungal infection caused by Candida albicans. A patient with leukemia has lower than normal functioning leukocytes. This, coupled with chemotherapy which aims to

reduce the number of abnormal leukocytees, leaves the patient in a very

immunosuppressed state. 

Other examples of cases where a patient

would be susceptible to candidiasis include

patients taking antibiotics for a extended

periods or patients infected with HIV.

Bacterial Descriptor conflicts with another one

# Which one of these bacterial descriptors conflict with the other five?
A. Gram positive
B. Proteobacteria
C. Gram negative
E. Thin peptidoglycan 

D. Pink in a Gram stain 

The correct answer is A. Gram positive. 

Proteobacteria, a pink Gram result, an outer

membrane, and thin peptidoglycan are all

characteristic of Gram NEGATIVE bacteria

such as E. coli.

Note: This question has conflicting

answers regarding gram positive and gram

negative characteristics. 

Nerve running along the nasal septum

 # Which of the following nerves runs along the nasal septum?
A. Nasopalatine
B. Greater palatine
C. Pharyngeal
D. Posterolateral nasal

The correct answer is A. Nasopalatine.

Nasopalatine nerve 

-Exits Pterygopalatine fossa through Sphenopalatine foramen which takes it into the nasal cavity.
- Runs anterior-inferiorly along the nasal septum.
- Passes through incisive foramen of maxilla to reach the anterior hard palate.

The nasopalatine nerve supplies the posterior part of the nasal septum.

The anterior ethmoidal nerve, a branch of V1, supplies the anterior part of the nasal septum.

The flexible part of the nasal septum by the nostril opening is supplied by the nasal branch of the infraorbital nerve. 

Tooth most likely to not erupt due to overcrowding

# Which of the following teeth is most likely to NOT erupt into the arch due to overcrowding?
A. Canine
B. Central incisor
C. Lateral incisor
D. 2nd premolar
E. 1st premolar

The correct answer is A. Canine.

Canines are the anterior teeth that are most
likely to be unable to erupt within a crowded dentition because the canine erupts after the incisors and premolars have already erupted.

Tooth crowding may occur in patients with
teeth that are too wide mesiodistally or if
their dental arch is too small to
accommodate all the erupted teeth.

Tooth crowding carries a genetic predisposition because it is often a matter of tooth size vs arch size.