Deck 7: Dental Anomalies

Question 1

A clinical characteristic of dens in dente is a(n)

A) Extremely deep pit
B) Tubercle
C) Tiny tooth attached to a lingual surface of a molar
D) Hypoplastic enamel surface

Answer 1

A
Dens in dente, meaning tooth within a tooth, results from invagination of the crown prior to mineralization. This anomaly allows communication between the oral cavity and the inner enamel-lined cavity, which is often described as an extremely deep pit. Regarding the incorrect selections, a tubercle is a small elevation. A supernumerary tiny tooth (microdont) attached to a lingual surface is a paramolar. Hypoplastic enamel is one type of enamel dysplasia.

Question 2

An anomaly common to mandibular second premolars is

A) Dwarfed roots
B) Buccal tubercles
C) Accessory roots
D) Large lingual cusps

Answer 2

C
The maxillary second premolars often have two bifurcated roots, although more frequently only one is present. It is not uncommon for these teeth to have accessory, or additional, roots. When present, accessory roots sometimes bifurcate at the apical third only.

Question 3

Supernumerary maxillary teeth are more common than supernumerary mandibular teeth because metabolic intrinsic factors within the palate produce more hyperdontia.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Answer 3

C
Hyperdontia, an anomaly resulting in formation of too many teeth (called supernumerary teeth), occurs more commonly in the midline and molar regions of the maxillae. Maxillary supernumerary teeth outnumber mandibular nine to one. Extra teeth are less commonly formed in the premolar region of the mandible. Other sites are rarely involved. The reason provided is entirely False.

Question 4

Each of the following is an example of microdontia EXCEPT one. Which one is the EXCEPTION?

A) Mesiodens
B) Paramolar
C) Distomolar
D) Tubercle
E) Enamel pearl

Question 5

An odontoma is composed of each of the following EXCEPT one. Which one is the EXCEPTION?

A) Dentin
B) Pulp
C) Enamel
D) Cementum

Question 6

A dilacerated root is one that exhibits

A) Bifurcated roots
B) Twisted roots
C) A sharp bend in the root
D) Short, fused roots

Question 7

Each of the following is true of dentinogenesis imperfecta EXCEPT one. Which is the EXCEPTION?

A) The pulp is filled with dentin.
B) The tooth appears translucent.
C) The enamel cannot develop over defective dentin.
D) It is a hereditary developmental anomaly.
E) All of the above are true.

Question 8

The canines are LEAST likely of all permanent teeth to be congenitally missing because unlike other permanent teeth, canines begin to calcify by about the fourth of fifth month of fetal life.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 9

An unusually large tooth is an example of

A) Hyperdontia
B) Fusion
C) Gemination
D) Macrodontia

Question 10

The MOST commonly missing permanent teeth are the maxillary premolars. The next teeth MOST likely to be missing are the permanent maxillary lateral incisors.

A) Both statements are true.
B) The first statement is true, the second is false.
C) The first statement is false, the second is true.
D) Both statements are false.

Question 11

Fusion involves the joining of two adjacent teeth at the cementum because this process is associated with excessive production of cementum.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 12

Enamel dysplasia is associated with each of the following EXCEPT one. Which one is the EXCEPTION?

A) Fluorosis
B) Amelogenesis imperfecta
C) Turner's tooth
D) Enamel hypocalcification
E) Dilaceration

Question 13

Which permanent tooth is the LEAST likely to be congenitally missing?

A) Maxillary lateral incisor
B) Mandibular second premolar
C) Maxillary third molar
D) Mandibular third molar

Question 14

Fusion of roots of adjacent teeth at the cementum is called concrescence and is primarily caused by dilaceration. Gemination is the deposition of excessive secondary cementum.

A) Both statements are true.
B) The first statement is true, the second is false.
C) The first statement is false, the second is true.
D) Both statements are false.

Question 15

Gemination occurs most frequently in the permanent dentition. It is the splitting of the tooth into two crowns and separate roots.

A) Both statements are true.
B) The first statement is true, the second is false.
C) The first statement is false; the second is true.
D) Both statements are false.

Question 16

Tetracycline staining is an enamel dysplasia that occurs because an expectant mother or young child with tooth crowns still developing takes the antibiotic tetracycline.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 17

A distomolar is attached to the distal surface of a maxillary molar. Maxillary distomolars are the most common supernumerary teeth.

A) Both statements are true.
B) The first statement is true, the second is false.
C) The first statement is false, the second is true.
D) Both statements are false.

Question 18

Turner's tooth results in notched incisors and mulberry molars because prenatal syphilis disturbs normal tooth formative processes.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 19

A fourth molar may be described by each of the following EXCEPT one. Which one is the EXCEPTION?

A) Macrodont
B) Distomolar
C) Supernumerary tooth
D) Supplemental tooth
E) Hyperdont

Question 20

Dens in dente, or dwarfed roots, is a developmental variation that occurs because the outer surface of the tooth crown invaginates by turning itself inward prior to mineralization.

A) Both the statement and the reason are correct and related.
B) Both the statement and the reason are correct but are NOT related.
C) The statement is correct, but the reason is NOT correct.
D) The statement is NOT correct, but the reason is correct.
E) NEITHER the statement NOR the reason is correct.

Question 21

A patient, Suzanne, is 4 months pregnant. She is concerned about her recent sinus infection that required penicillin therapy. She is worried that her baby's teeth will be discolored. She is also concerned that her baby will have a missing maxillary lateral incisor because her father and aunt do not have these teeth. Penicillin can cause

A) Stained teeth
B) Malformed teeth
C) Hypocalcification
D) None of the above

Question 22

A patient who has had four teeth extracted for orthodontia has true partial anodontia.

Question 23

A child who has congenitally missing maxillary canines will have congenitally missing permanent canines.

Question 24

Anomalies are caused by intrinsic factors only.

Question 25

A patient, Suzanne, is 4 months pregnant. She is concerned about her recent sinus infection that required penicillin therapy. She is worried that her baby's teeth will be discolored. She is also concerned that her baby will have a missing maxillary lateral incisor because her father and aunt do not have these teeth. The baby may be missing one or both of the permanent maxillary lateral incisors due to

A) A conditional factor
B) A hereditary factor
C) An extrinsic factor
D) Maternal stress