Abnormalities of Teeth

Question 1

The congenital absence of six or more teeth is known as:

Answer 1

Oligodontia

Question 2

Absence of 1 or more teeth; congenitally missing teeth.

What tooth is most commonly affected?

Answer 2

Hypodontia

Third molars

Question 3

Is having 2 successive sets of teeth (as in humans)

Answer 3

Diphyodontia

Question 4

What is polyphyodontia?

Answer 4

Having more than 2 sets of teeth in a lifetime

Question 5

Hypsodontia is?

Answer 5

Having teeth with high crown (cusps)

Question 6

It is associated with a diet of abrasive food

Answer 6

Hypsodont dentition

Question 7

What type of dentonigenesis imperfecta features multiple pulp exposures, periapical radiolucencies, and a variable radiographic appearance?

Answer 7

Type III (Brandywine type)

Question 8

Is an autosomal dominant condition in which there is an intrinsic alteration in the dentin.

Answer 8

Dentinogenesis imperfecta

Question 9

Dentin abnormality occurs in patient that have osteogenesis imperfecta (characterized by blue sclera or a history of bone fractures) ; PRIMARY teeth are more severely affected.

Answer 9

Dentino. Imp. Type I

Question 10

Clinically termed as “Osteogenesis Imperfecta with opalescent teeth”

Answer 10

TYPE I D.I

Question 11

Most common supernumerary tooth

Answer 11

Mesiodens

Question 12

Is a developmental union of two or more teeth in which the dentin and other dental tissue are united

Answer 12

Fusion

Question 13

Cementum of two or more teeth becomes united

Answer 13

Concrescence

Question 14

Also called as dens invaginatus means “tooth within a tooth”; a deep invagination of the enamel organ during formation.

Most likely associated tooth?

Answer 14

Dens in dente

Maxillary lateral incisor

Question 15

A single tooth bud attempts to divide and gives rise to the appearance of two clinical crowns

Answer 15

Gemination

Question 16

All of the following are differential diagnoses for hypercementosis EXCEPT one.

Cemento - osseous dysplasia
Cementoblastoma
Condensing osteitis
Odontogenic keratocyst

Answer 16

OKC

Question 17

An enamel defect resulting from the incomplete formation of the enamel matrix is called:

Answer 17

Enamel hypoplasia

Question 18

It involves hard tissues that are derived from both epithelial (enamel) and mesenchymal (dentin and cementum); exhibits short roots, open apical foramina and enlarged pulp chambers.

Answer 18

Regional odontodysplasia

Question 19

Clinical appearance of enamel hypoplasia

Answer 19

Lack of contact between teeth
Rapid breakdown of occlusal surface
Yellowish-brown stain

Question 20

Fusion of the cementum or dentin to the surrounding alveolar bone after loss of the intervening periodontal membrane; associated with hypodontia

Answer 20

Ankylosis

Question 21

Most commonly ankylosed tooth

Answer 21

Primary 2M

Question 22

The abnormal loss of tooth structure due to non-masticatory physical friction is referred as:

Answer 22

Abrasion

Question 23

Is the wearing away of enamel and dentin due to the normal function or most commonly, due to excessive grinding or gritting together of teeth by patient.

Answer 23

Attrition

Question 24

Wedge shaped cervical erosive lesion that cannot be attributed to any particular cause

Answer 24

Abfraction

Question 25

The following conditions cause intrinsic staining of teeth:

Answer 25

Dentinogenesis imperfecta
Erythroblastosis fetalis
Porphyria
Fluorosis
Pulpal injury
Internal resorption
Tetracyclines
Hypomineralized enamel

Question 26

In an unusual form of tooth resorption that begins centrally within the tooth; endodontic therapy may be carried out

Answer 26

Internal resorption

Question 27

Extremely common and typically involved the middle or apical root. The source of resorption is in the PDL.

Answer 27

External resorption

Question 28

Type I dentin dysplasia, roots appear extremely short, and pulps are:

Answer 28

Completely obliterated

Question 29

An autosomal dominant trait that affects dentin.

Answer 29

Dentin dysplasia

Question 30

Radiographic features:

Obliterated pulp chambers and root canal
Residual fragments of pulp tissue appear typically as horizontal lucencies (chevrons)

Answer 30

Type I (radicular dysplasia) - more common type

Question 31

“Thistle tube” in appearance

Answer 31

Type II (coronal dysplasia)