Question 1

All of the following statements about erythroblastosis fetalis are true EXCEPT:

Accepted Answer

Erythroblastosis fetalis occurs when the mother and fetus have incompatible blood types, specifically regarding the Rh factor, not when they have the same blood type.

Question 2

Nasolabial cysts are:

Accepted Answer

Nasolabial cysts are found within soft tissues of the lip below the ala of the nose. They are not derived from the rests of Serres or Malassez and do not occur in bone behind the maxillary central incisors.

Question 3

Which of the following presents as a small radiopaque sphere, commonly mistaken for calculus?

Accepted Answer

Enamel pearls are small spherical projections of enamel found on the root surface or in furcations of multi-rooted teeth. They are often mistaken for calculus on radiographs due to their radiopaque appearance. Talon's cusp, dilaceration and taurodontism are all dental anomalies that do not present as small radiopaque spheres.

Question 4

Enamel hypoplasia that affects multiple teeth in a band-like pattern, and reflects the times of tooth development at which amelogenesis was interrupted, is known as:

Accepted Answer

Enamel hypoplasia that affects multiple teeth in a band-like pattern, reflecting the times of tooth development at which amelogenesis was interrupted is known as contemporaneous enamel hypoplasia. The other options are not correct definitions of this condition.

Question 5

Tetracycline chelates calcium ions and becomes incorporated into all of the following mineralizing tissues EXCEPT:

Accepted Answer

Tetracycline is known to chelate with calcium ions, making it a common treatment for various infections. Tetracycline gets incorporated into mineralizing tissues in the body such as bones, enamel, and dentin. However, it does not get incorporated into the pulp, which is a non-mineralized tissue made up of nerves and blood vessels. Therefore, the correct answer is D) Pulp.

Question 6

All of the following statements about primordial cysts are true EXCEPT:

Accepted Answer

Primordial cysts most commonly occur in the place of the third molars, particularly in the mandible, rather than the anterior region of the mandible.

Question 7

Epidermoid cysts of the skin typically originate from:

Accepted Answer

Epidermoid cysts, also known as sebaceous cysts, typically originate from a hair follicle that has become inflamed or blocked, leading to the accumulation of keratin and other materials.

Question 8

The presence of multiple odontogenic keratocysts (OKCs) has been associated with which of the following syndromes?

Accepted Answer

Nevoid basal cell carcinoma syndrome, also known as Gorlin syndrome, is characterized by multiple OKCs among other features such as basal cell carcinomas, skeletal abnormalities, and pits in the palms and soles. Lynch syndrome (choice A) is associated with an increased risk of colorectal and endometrial cancer. Cowden syndrome (choice B) is associated with multiple hamartomas and an increased risk of certain cancers. Gardner syndrome (choice D) is a subtype of familial adenomatous polyposis and is characterized by multiple colorectal polyps and other features such as osteomas and soft tissue tumors.

Question 9

All of the following statements about cysts are true EXCEPT:

Accepted Answer

The statement "The odontogenic types can occur anywhere in the body" is false. Odontogenic cysts are specifically related to tooth development and occur only in the jawbone or nearby structures.

Question 10

Rests of Serres are epithelial remnants of dental lamina that are found in:

Accepted Answer

Rests of Serres are remnants of dental lamina that do not differentiate into tooth buds during odontogenesis. They are found in the gingival tissues near the tooth, particularly in the periodontal ligament.

Question 11

A well-defined unilocular radiolucency around the crown of an unerupted tooth within bone is most likely a(n):

Accepted Answer

A dentigerous cyst is a well-defined unilocular radiolucency around the crown of an unerupted tooth within bone. Radicular cysts form from a necrotic pulp and are usually associated with the root of a non-vital tooth, eruption cysts occur in soft tissues rather than bone, and periodontal cysts are typically located near the roots of vital teeth.

Question 12

Incomplete or defective development of enamel is known as:

Accepted Answer

Enamel hypoplasia is the incomplete or defective development of enamel.

Question 13

Which of the following cysts may have a heart-shaped appearance?

Accepted Answer

The nasopalatine duct cyst may have a heart-shaped appearance due to the fusion of its two lobes.

Question 14

Enamel hypoplasia of one or two permanent teeth, caused by localized disturbance of amelogenesis, is referred to as

Accepted Answer

Turner tooth, also known as enamel hypoplasia, is a condition where one or two permanent teeth have defective enamel formation due to a localized disturbance of amelogenesis. Exogenous amelogenesis and dentinogenesis imperfecta are generalized defects in enamel and dentin formation, respectively. Amelogenesis imperfecta is a genetic condition affecting the enamel formation on all teeth, not just one or two.

Question 15

Which of the following cysts often occurs above the mylohyoid muscle, and displaces the tongue back and upward toward the roof of the mouth?

Accepted Answer

Dermoid cysts often occur above the mylohyoid muscle and can displace the tongue back and upward toward the roof of the mouth due to their location and size.

Question 16

Rests of Malassez are epithelial remnants of:

Accepted Answer

Rests of Malassez are small clusters of epithelial cells that persist in the periodontal ligament after the formation of the tooth. They are remnants of Hertwig's root sheath, which is an epithelial structure that determines the shape and number of roots during tooth development. Therefore, the correct answer is option C.

Question 17

The degree of tetracycline staining in teeth is related to all of the following EXCEPT:

Accepted Answer

The degree of tetracycline staining is not related to the frequency of fluoride application. The other options (A, B, and D) are known factors that affect the severity of tetracycline staining.

Question 18

Follicular cysts occur when:

Accepted Answer

Follicular cysts occur when the reduced enamel epithelium becomes separated from the enamel surface.

Question 19

Which of the following is characterized by a vertical increase in the size of the crown of the tooth at the expense of the roots?

Accepted Answer

Taurodontism is a condition in which there is a vertical increase in the size of the crown of the tooth at the expense of the roots, resulting in a larger pulp chamber and shorter roots. Dens evaginatus is a developmental anomaly in which there is an extra cusp on the tooth, Talon's cusp is a morphological variation characterized by an accessory cusp located on the lingual surface of the anterior teeth, and fusion is a union of two teeth during development resulting in a larger tooth. None of these conditions specifically involve a vertical increase in the size of the crown at the expense of the roots.

Question 20

Which of the following cysts can be seen in the gingiva of newborns at or shortly after birth, or in adults?

Accepted Answer

Gingival cysts can occur in newborns, known as Bohn's nodules, and in adults as gingival cysts of the adult.

Quiz 5: Developmental Disorders