Question 1

Impacted teeth cannot erupt because of:

Accepted Answer

Impacted teeth are obstructed by physical barriers such as other teeth, bone or soft tissue. Lack of eruptive force, ankylosis and bone pathology can also play a role in impaction, but physical obstruction is the primary cause.

Question 2

Nonerupted supernumerary teeth should be extracted because of the following risk.

Accepted Answer

Nonerupted supernumerary teeth can lead to the formation of cysts around their crowns, which is a common reason for their extraction.

Question 3

Which one of the following defines a disturbance of the maturation of the enamel matrix?

Accepted Answer

Enamel hypocalcification is a disturbance of the maturation of the enamel matrix, where the enamel is not fully mineralized and appears white or yellow in color. Turner tooth is a condition where a tooth is hypoplastic due to trauma or infection during its development. Mulberry molar is a malformed permanent first molar with multiple enamel and dentin projections. Premature birth may lead to enamel hypoplasia, but not necessarily a disturbance of the maturation of the enamel matrix.

Question 4

Multiple supernumerary teeth may be a component of which of the following?

Accepted Answer

Multiple supernumerary teeth are a common feature of cleidocranial dysplasia, which is characterized by abnormal bone development in the skull and collarbone area. Dermoid cysts and static bone cysts do not involve dental abnormalities, and syphilis may cause tooth loss rather than supernumerary teeth.

Question 5

Which tooth is most commonly affected by dens in dente?

Accepted Answer

Dens in dente, also known as dens invaginatus, most commonly affects the maxillary lateral incisors.

Question 6

Another name for dens invaginatus is:

Accepted Answer

Dens in dente is another name for dens invaginatus. Taurodontism is a developmental anomaly in which teeth exhibit elongated large pulp chambers and short roots. Dens evaginatus is a rare developmental anomaly in which an enamel cusp is found on the occlusal surface of mandibular premolars. Enamel pearl or enameloma is a projection of enamel found on the furcation area of maxillary molars.

Question 7

The pear-shaped radiolucency observed in this radiograph is most likely a:

Accepted Answer

The answer of  The pear-shaped radiolucency observed in this...

Question 8

For which condition would pulp vitality be nonvital?

Accepted Answer

Pulp vitality would be nonvital in a radicular cyst, as the cystic lesion arises from the necrosis of the pulp tissue within the root canal. Median mandibular cyst, median palatal cyst, and periapical cemento-osseous dysplasia do not involve pulp tissue necrosis.

Question 9

The supernumerary tooth in this illustration is called:

Accepted Answer

The answer of  The supernumerary tooth in this illustration...

Question 10

The most common supernumerary tooth is called:

Accepted Answer

The most common supernumerary tooth is called a mesiodens. It is a small, cone-shaped tooth that develops in the midline between the two upper central incisors. Distomolar, mulberry molar, and Turner tooth are not common supernumerary teeth.

Question 11

Regional odontodysplasia is:

Accepted Answer

Regional odontodysplasia involves a decrease in radiodensity seen in one or more unerupted teeth in a quadrant. Regional odontodysplasia is not a genetic condition. Regional odontodysplasia is not caused by systemic illness. Regional odontodysplasia is more often seen in the anterior maxilla.

Question 12

The projection of white material seen at the furcation area in this maxillary molar is a developmental anomaly. You suspect

Accepted Answer

The answer of  The projection of white material seen...

Question 13

This radiograph clearly shows which developmental anomaly?

Accepted Answer

The answer of  This radiograph clearly shows which developmental...

Question 14

Dens in dente is a developmental anomaly often seen with:

Accepted Answer

Dens in dente is a developmental anomaly often seen with a periapical lesion. Dens evaginatus is an accessory occlusal cusp found on mandibular premolars. Tuberculated premolars occur when the mandibular premolars are affected with dens evaginatus. Dens in dente does not exhibit evidence of supernumerary roots.

Question 15

The developmental anomaly seen in this radiograph is:

Accepted Answer

The answer of  The developmental anomaly seen in this...

Question 16

Pitting is the most common type of enamel hypoplasia seen in patients who have which condition during tooth development?

Accepted Answer

Febrile illnesses such as measles and chickenpox cause enamel hypoplasia showing pitting of the enamel. Drinking water with twice the recommended fluoride content causes white flecks or chalky areas of the enamel. Congenital syphilis causes mulberry molars and Hutchinson incisors. Herpes simplex is characterized by oral ulcers involving the soft tissues and not enamel hypoplasia.

Question 17

Ingesting water with four times the amount of fluoride causes:

Accepted Answer

Ingesting water with four times the amount of fluoride causes brown-to-black staining. The amount of fluoride ingested does not cause cusp fractures. White spots on the middle third of smooth crowns are enamel hypocalcification. Teeth affected by fluorosis are generally decay resistant.

Question 18

Regional odontodysplasia is also referred to as:

Accepted Answer

Regional odontodysplasia is also known as ghost teeth due to the pale, translucent appearance of affected teeth. Hypodontia refers to a congenital lack of teeth, taurodontism refers to a specific tooth shape and structure, and supernumerary teeth refer to extra teeth.

Question 19

The pseudocyst seen in this radiograph is surrounded by salivary gland tissue. It is a/an:

Accepted Answer

The answer of  The pseudocyst seen in this radiograph...

Question 20

Enamel hypoplasia is the result of a disturbance of or damage to ameloblasts during enamel matrix formation.Which one of the following would not be a factor?

Accepted Answer

Shingles is a viral infection that affects nerves and is not related to enamel formation, so it would not be a factor in enamel hypoplasia. A, B, and C are all potential factors that could lead to enamel hypoplasia.

Quiz 5: Developmental Disorders