Question 1

Which teeth are most commonly affected by microdontia?

Accepted Answer

The maxillary lateral incisor and maxillary third molar are the teeth most commonly affected by microdontia.

Question 2

With concrescence, which tissue unites two adjacent teeth?

Accepted Answer

The condition in which two adjacent teeth become united by cementum is termed concrescence. Enamel is not involved with concrescence. Dentin is not involved with concrescence. Pulp is not involved with concrescence.

Question 3

Your patient presents with several horizontal rows of deep pits traversing the surfaces of the permanent central and lateral incisors, canines, and first molars. The pits are stained and unsightly. Which condition is suspected?

Accepted Answer

Enamel hypoplasia is the incomplete or defective formation of enamel, causing the alteration of tooth form or color. Dens in dente is a developmental anomaly that results when the enamel organ invaginates into the crown of a tooth before mineralization. Concrescence is a condition in which two adjacent teeth are united by cementum. Oligodontia is a term describing a type of hypodontia in which six or more teeth are congenitally missing.

Question 4

Which cyst develops from a preexisting periapical granuloma found at the apex of a nonvital tooth?

Accepted Answer

The radicular (or periapical) cyst is always associated with a nonvital tooth; it develops from a preexisting periapical granuloma found at the apex of a nonvital tooth. The follicular (dentigerous) cyst forms around the crown of an unerupted or developing tooth. The eruption cyst is found in the soft tissue around the crown of an erupting tooth. The calcifying odontogenic cyst resembles the epithelium of the ameloblastoma.

Question 5

The following groups of teeth are most often missing with hypodontia except one. Which is the exception?

Accepted Answer

The mandibular canines are not typically missing in a case of hypodontia. The teeth most often missing with hypodontia include the maxillary and mandibular third molars. The teeth most often missing with hypodontia include the maxillary lateral incisors. The teeth most often missing with hypodontia include the mandibular second premolars.

Question 6

Trauma or change in the environment at the time of birth can eventually cause enamel hypoplasia in the child. Which cells are so sensitive and easily damaged to cause this defect?

Accepted Answer

Ameloblasts form and are one of the most sensitive cell groups in the body. Neutrophils are the first white blood cells to arrive at a site of injury. Macrophages are the second type of white blood cell to arrive at a site of injury. C-reactive proteins are nonspecific proteins that become elevated during episodes of acute inflammation or infection.

Question 7

Which statement about macrodontia is true?

Accepted Answer

Macrodontia is seen occasionally in cases of pituitary gigantism. Macrodontia is an uncommon developmental anomaly in which one or more teeth are larger than normal. Macrodontia affecting a single tooth is uncommon. No treatment is indicated for macrodontia.

Question 8

What is a condition likely to reveal ankylosed teeth?

Accepted Answer

Ankylosed teeth are fused to the alveolar bone, a condition especially common with deciduous teeth. A dentigerous cyst surrounds the crown of an unerupted or impacted tooth. Supernumerary teeth are not associated with ankylosed teeth. Orthodontic appliances are not associated with ankylosed teeth.

Question 9

Since the dens in dente is often a nonvital tooth, it may be seen in association with

Accepted Answer

The dens in dente is vulnerable to caries and pulpal infection and therefore may be associated with a periapical lesion. Dens in dente is not associated with an impacted tooth. Dens in dente does not cause swelling or displacement of surrounding teeth. Dens in dente is not associated with malocclusion.

Question 10

The presence of Hutchinson incisors and mulberry molars would indicate the presence of which condition?

Accepted Answer

Congenital syphilis is transmitted from an infected mother to her fetus; teeth affected in the child include the incisors and molars. Hepatitis B does not cause any changes in the sizes of permanent teeth. HIV disease does not cause any changes in the sizes of permanent teeth. Chickenpox that occurs during the time of tooth formation may result in the pitting of enamel.

Question 11

What is the radiographic feature of a cyst found within soft tissue?

Accepted Answer

No radiographic features are seen when a cyst is found within soft tissue. Unilocular refers to a single rounded compartment. Multilocular describes multiple rounded compartments that may appear "soap bubble-like." Diffuse denotes a border that is not well defined, and the parameters of the lesion are unknown.

Question 12

Which term is unlike the others?

Accepted Answer

Hypodontia refers to a lack of one or more teeth. A distomolar is an extra tooth, also known as a maxillary fourth molar. Supernumerary is a term to describe extra teeth found in the dental
arches. A mesiodens is a supernumerary tooth located between the maxillary central incisors at the midline.

Question 13

An asymptomatic, well-defined unilocular radiolucency was discovered in the region of tooth #32 on a panoramic image of a young adult patient. This tooth had never formed and therefore was never extracted. Identify this cyst:

Accepted Answer

The primordial cyst develops in place of a tooth and is most commonly found in place of the third molar. The odontogenic keratocyst is often seen in the mandibular third molar region, yet often appears as a multilocular radiolucency that can move teeth and resorb tooth structure. The periapical cyst is always associated with a nonvital tooth. The static bone cyst is a well-defined radiolucency seen in the posterior mandible; clinically, an anatomic depression may be felt in this area on the lingual side of the mandible.

Question 14

Pitting of the enamel may be seen in these conditions except one. Which is the exception?

Accepted Answer

The presence of a talon cusp does not cause pitting of the enamel. Febrile illnesses, such as measles, that occur during the time of tooth formation can result in pitting of the enamel. Vitamin deficiencies, such as vitamins A, C, and D, that occur during the time of tooth formation can result in pitting of the enamel. Febrile illnesses, such as scarlet fever, that occur during the time of tooth formation can result in pitting of the enamel.

Question 15

After the tooth erupts into the oral cavity, how long is it before the root length is complete?

Accepted Answer

Root length is not completed until 1-4 years after the tooth erupts into the oral cavity.

Quiz 5: Developmental Disorders