SAS 4 Clinical Significance of Oral Anatomy, Histology,Physiology and Occlusion to Operative Dentistry

Question 1

is formed by cells called ameloblasts, which originate from the embryonic germ layer known as an ectoderm.

Answer 1

Enamel

Question 2

have short extensions toward the dentinoenamel junction (DEJ); these are termed Tomes processes.

Answer 2

Ameloblasts

Question 3

The building structures or blocks of enamel are called

Answer 3

Enamel rods

Question 4

appear like “keyholes” or paddle shaped.

Answer 4

Enamel rods

Question 5

are entwined rods with adjacent groups of rods, which follows a curving irregular path toward the tooth surface

Answer 5

Gnarled enamel

Question 6

These bands appear to be composed of alternate light and dark zones of varying widths that have slightly different permeability and organic content.

Answer 6

Hunter schreger bands

Question 7

hypomineralized structures of enamel rods and inter-rod substance that project between
adjacent groups of enamel rods from the DEJ. May play a role in the spread of dental caries.

Answer 7

Enamel tufts

Question 8

are thin leaf-like faults between enamel rod groups that extend from the enamel surface to DEJ sometimes into the dentin.

Answer 8

Enamel lamellae

Question 9

contain mostly organic material, which is a weak area
predisposing a tooth to the entry of bacteria and dental caries.

Answer 9

Enamel lamellae

Question 10

originate from the DEJ, may serve as pain receptors, explaining the enamel sensitivity experienced by some patients during tooth preparation.

Answer 10

Enamel spindles

Question 11

the interface of the enamel and dentin.

Answer 11

Dentino enamel junction DEJ

Question 12

It is scalloped or wavy in outline, with the crest of the waves penetrating toward the enamel.

Answer 12

DEJ

Question 13

is formed by cells called odontoblasts.

Answer 13

Dentin

Question 14

is the dentin forming the initial shape of the tooth

Answer 14

Primary dentin

Question 15

is characterized by a slower rate of deposition and an abrupt change in the direction of the dentinal tubules.

Answer 15

Secondary dentin

Question 16

Two kinds of cementum are formed:

Answer 16

Acellular and cellular

Question 17

first formed cementum

Answer 17

Acellular cementum

Question 18

most of it is formed after tooth reaches
occlusal surface

Answer 18

Cellular cementum

Question 19

covers approximately the cervical third or half
of the root

Answer 19

Acellular

Question 20

Covers the apical third of the root

Answer 20

Cellular

Question 21

Contain cementocytes

Answer 21

Cellular

Question 22

TRUE OR FALSE

DOES ACELLULAR CEMENTUM CONTAINS NO CELLS ?

Answer 22

True

Question 23

More calcified

Answer 23

Acellular

Question 24

Sharpey’s fibers make up most of the
structures

Answer 24

Acellular

Question 25

Completely calcified

Answer 25

Acellular