DA Exam 1

Question 1

Primary dentition consists of how many teeth

Answer 1

20 teeth in total
10 upper
10 lower

Question 2

Mixed dentition period is composed of both ______ and ______ teeth

Answer 2

Deciduous and permanent teeth

Question 3

Mixed dentition period starts with the eruption of the first permanent tooth at about age _____ and ends with the loss of the last deciduous tooth at age ____

Answer 3

6
12-13

Question 4

Permanent dentition is composed of

Answer 4

32 teeth in all
16 upper and 16 lower

Question 5

Permanent molars, which replace nothing, are called

Answer 5

accessional teeth

Question 6

Review this slide

Answer 6

Question 7

Enamel is thickest at the _______

Answer 7

cusp tips

Question 8

Enamel is extremely brittle, its hardness decreases as it approaches the ____

Answer 8

DEJ

Question 9

What are the chemical components in enamel

Answer 9

96% hydroxyapatite
3% water
1% organic

Question 10

Define Retzius lines

Answer 10

retzius lines reflect the appositional growth of enamel during the formation of the crown

Question 11

In newly erupted teeth, the cervical retzius lines end at the surface in a groove called the ____

Answer 11

perikymata

Question 12

What marks the division between enamel formed before birth and that which is produced after birth

Answer 12

the neonatal line

Question 13

The fundamental morphologic unit of enamel is the ____

Answer 13

enamel rod

Question 14

Each enamel rod is formed in increments by an ______

Answer 14

ameloblast

Question 15

How do fissures form

Answer 15

they occur as the result of failure of the enamel to coalesce between developmental lobes and results in invagination of the surface

Question 16

Define pit

Answer 16

non-coalesced enamel at the deepest point of a fossa

Question 17

Hypermineralized zone, aprismatic enamel, strong mechanical scalloped junction

Answer 17

Dentinoenamel junction (DEJ)

Question 18

Chemical components of dentin

Answer 18

70 % hydroxyapatite
20% type 1 collagen
10% water

Question 19

What tissue is softer than enamel but harder than bone and cementum

Answer 19

dentin

Question 20

Dentin origin

Answer 20

ectomesenchyme

Question 21

Odontoblasts have protoplasmic extensions which enter the dentine in circular channels termed ________

Answer 21

dental tubules

Question 22

Where do dental tubules have the smallest diameter and are furthest apart

Answer 22

near the DEJ

Question 23

Where do dental tubules have their largest diameter and are the closest together

Answer 23

Near the pulp

Question 24

Dentinal tubules start at right angles from the ________ and then follow an S shaped course

Answer 24

Pulp surface

Question 25

What type of dentin is the bulk of it formed in the crown and root

Answer 25

primary dentin *has regular formation

Question 26

What type of dentin is not deposited evenly and is deposited on the pulpal surface

Answer 26

secondary dentin

Question 27

What type of dentin is deposited in localized areas beneath trauma

Answer 27

tertiary dentin

Question 28

what type of dentin is highly mineralized and composes the walls of the tubules

Answer 28

Peritubular dentin

Question 29

What type of dentin is the secretory product of the odontoblasts and consist of mostly type 1 collaged

Answer 29

intertubular dentin

Question 30

Cementum is derived from

Answer 30

ectomesenchyme

Question 31

cementum is formed by _____

Answer 31

cemntoblasts

Question 32

What is the hard dental tissue covering the anatomic roots of the teeth

Answer 32

cementum

Question 33

Excessive cementum is called

Answer 33

hypercementosis

Question 34

Chemical components of cementum

Answer 34

inorganic 45% Organic 50% water 5%

Question 35

What are the two kinds of cementum

Answer 35

cellular and acellular

Question 36

Cellular cementum contains entrapped cells called

Answer 36

cementocytes

Question 37

Cellular cementum is found on the _____ half of

Answer 37

apical

Question 38

Acellular cementum is found on the ______ half of the root

Answer 38

coronal half

Question 39

Define pulp chamber

Answer 39

The coronal pulp located in the anatomical crown

Question 40

Define pulp horns Where are they located

Answer 40

projections in the roof of the pulp chamber towards the cusp tips or lobes. The pulp horns are located in the pulp chamber. More prominent in younger patients.

Question 41

Define root canal

Answer 41

the radicular pulp located in the anatomical root

Question 42

define apical foramen

Answer 42

the opening at or near the apex. This foramen is a passage way for blood or lymph vessels, nerves and connective tissue elemetns.

Question 43

Define lateral canals

Answer 43

these are branches of pulp which extend laterally

Question 44

What are maxillary canines most common morphological variations?

Answer 44

Cusp-like tubercle on cingulum