Chapter 2 Abnormalities of teeth TEST #1

Question 1

T/F Ameloblasts in the developing tooth germ are extremely sensitive to external stimuli

Answer 1

True

Question 2

When do the crowns of deciduous teeth develop?

Answer 2

-14th week gestation through 12 months of age

Question 3

When do the crowns of permanent dentition occur from?

Answer 3

-6 months to 15 years

Question 4

What is an enamel defect seen in permanent teeth caused by periapical inflammatory disease of the overlying deciduous tooth?

Answer 4

-Turner’s hypoplasia

Question 5

Where do you most commonly see turner’s hypoplais?

Answer 5

-Permanent bicuspids

Question 6

What is dental fluorosis?

Answer 6

-Excess amounts of fluoride can result in significant enamel defects

Question 7

When is the period for clinically significant dental fluorosis?

Answer 7

-2nd and 3rd years of life

Question 8

What is the optimum fluoridation of drinking water?

Answer 8

.7 ppm

Question 9

What is congenital syphilis anterior teeth termed as?

Answer 9

-Hutchinson’s incisors

Question 10

What is congenital syphilis posterior teeth called?

Answer 10

-Mulberry molars

Question 11

What is Hutchinson’s triad?

Answer 11

-Hutchinson’s teeth
-Interstitial keratitis
-8th nerve deafness
(Can develop a saddle nose)

Question 12

What is erosion?

Answer 12

-Loss of tooth structure caused by a nonbacterial chemical process

Question 13

What is erosion due to acid reflux (gerd) called?

Answer 13

Perimolysis

Question 14

What is oligodontia?

Answer 14

-Lack of 6 or more teeth

Question 15

What is hypodontia?

Answer 15

-Lac of 1 or more teeth

Question 16

What are the commonly most affected teeth for hypodontia?

Answer 16

• 3rd molars
• 2nd premolars
• lateral incisors

Question 17

What is the most common hyperdontia site?

Answer 17

-Maxillary incisor (mesiodens)

Question 18

What is an abundance of supernumerary teeth known as?

Answer 18

-Cleidocranial dysplasia

Question 19

Accessory teeth may be present at or shortly after birth are known as what?

Answer 19

-Natal teeth

Question 20

What is Riga-Fede disease?

Answer 20

-Traumatic ulcerations of the adjacent soft tissue may occur during breast -feeding (due to natal teeth)

Question 21

What are the most frequently impacted teeth?

Answer 21

• Mandibular 3rds (most common)
• Maxillary 3rd (2nd most common)
• Maxillary canine (3rd most common)

Question 22

What is ankylosis in teeth?

Answer 22

-Failure to fully erupt

Question 23

What is gemination?

Answer 23

-Single enlarged tooth or joined tooth in which the tooth count is normal when the anomalouse tooth is counted as one

Question 24

What is fusion?

Answer 24

• Single enlarged tooth or joined tooth in which the tooth count reveals a missing tooth when the anamalous tooth is counted as one

Question 25

What is concrescence?

Answer 25

-Union of two adjacent teeth by cementum alone without confluence of underlying dentin

Question 26

What is Dilaceration?

Answer 26

-A bend in the tooth root

Question 27

Where does dens evaginatus occur?

Answer 27

-Premolar teeth, usually bilateral and more common in the mandibular arch

Question 28

What is a tooth within a tooth known as?

Answer 28

-Dens in dente

Question 29

What is a deep surface invagination of the crown or root that is lined by enamel?

Answer 29

-Dens in dente

Question 30

What is the most common tooth that gets a dens in dente?

Answer 30

-Permanent lateral incisors

Question 31

What is an enlargement of the body and pulp chamber of a multi-rooted tooth, with apical displacement of the pulpal floor?

Answer 31

-Taurodontism