Exam 2

Front 1

What is the correct order of the softest tooth tissue to the hardest?

Back 1

Cementum, Dentin, Enamel
(CDE)

Front 2

What is the correct order of the tooth tissue with the most organic composition to the lease organic?

Back 2

Cementum, Dentin, Enamel
(CDE)

Front 3

What is the name of the type of cell that forms dentin

Back 3

Odontoblasts

Front 4

Cementum is formed from cementocytes which originate in the

Back 4

PDL

Front 5

In which location will you not find evidence of any part of an odontoblast?

Back 5

Cementum- lacunae

Front 6

Which tissue will not remain intact if its formative cells die?

Back 6

Pulp

Front 7

Same or different?
Irregular dentin, reactive dentin, tertiary dentin

Back 7

Same

Front 8

Same or different?
Tome's fiber, dentinal fiber, odontoblastic process

Back 8

Same

Front 9

Same or different?
Dead tract, sclerotic dentin, secondary dentin?

Back 9

Different

Front 10

During odontogenesis when the dentin forms around the dental papilla, the inner most tissue of the papilla is considered the?

Back 10

Pulp

Front 11

The histiocytes in which tooth tissue can help fight infection?

Back 11

Pulp

Front 12

What is not a significant clinical effect of the death of the cells of the pulp?

Dentin formation ceases
Cementum formation ceases
Tooth becomes brittle
Tooth cannot sense pain

Back 12

Cementum formation DOES NOT cease

Front 13

Tetracycline stains are difficult to bleach or whiten due to most of the stain being in the ?

Back 13

Enamel and dentin

Front 14

Because of its mineral level, cementum appears more...

Back 14

Radiolucent (darker)

Front 15

Which formation is least normal?

Secondary dentin
hypercementosis
interglobular dentin

Back 15

Hypercementosis

Front 16

Which is not a problem that denticles may cause?

Restriction of blood flow in pulp
Cementicle formation
difficult root canal procedure

Back 16

Cementicle formation

Front 17

Which of the following is not a true statement about cementum?

It protects the dentin of the root
New cementum formation is much greater closer to the apical end of the root.

it helps compensate for occlusal wear of enamel
It lines the pulp

Back 17

It DOES NOT line the pulp- dentin does.

Front 18

Usually extra sensitive areas in dentin may be caused by hypocalcified areas such as:

dead tracts and sclerotic dentin
Tome's granular layer and interglobular dentin
Reactive dentin and Owen's lines of contour
Secondary denting and dentinal tubules

Back 18

Tome's granular layer and interglobular dentin can cause extra sensitive areas.

Front 19

After the loss of the Tome's fiber , a dentinal tubule which has filled in solid is called

Back 19

sclerotic dentin

Front 20

The unit of pattern of formation of enamel is called the

Back 20

Rod

Front 21

Sharpey's fibers do not anchor to

Back 21

Enamel

They do anchor to the lamina dura of the alveolar bone and the cementum

Front 22

Pulp stones are usually painful

Back 22

False

Front 23

Cervical abrasion of teeth can result in exposed dentin, causing sensitivity

Back 23

True

Front 24

The dentinoenamel junction is where the enamel meets secondary dentin

Back 24

False

Front 25

The most newly formed cementum is located nearest to the dentin

Back 25

False- forms outward

Front 26

Cementum formation begins before enamel

Back 26

False
Dentin first, enamel, then cementum (DEC)

Front 27

Hunter- Schreger bands are histological features found in dentin

Back 27

False they are found in enamel

Front 28

Dentin formation continues throughout life as long as the tooth is vital

Back 28

True

Front 29

Cementum formation begins before enamel formation

Back 29

False

Front 30

Enamel Rods are parallel to the dentin- enamel junction

Back 30

False- perpendicular

Front 31

The functions of the pulp include formative, sensory, nutritive, and protective

Back 31

True

Front 32

The embryologic background of cementum and dentin would tend to make the cemento-dentin junction less defined than the dentin-enamel junction

Back 32

True

Front 33

This tissue cannot remain alive throughout life

Back 33

Enamel

Front 34

The histiocytes in this tooth tissue perform a defensive function

Back 34

Pulp

Front 35

The stripes of Retzius appear on the surface of enamel as wavy lines called

Back 35

Perikymata

Front 36

The part of the tooth germ forms pulp tissue

Back 36

Dental papilla

Front 37

List the softest tooth tissue to the hardest

Back 37

Pulp, cementum, dentin, enamel

Front 38

Tooth pulp tissue does not include this type of cell

Ameloblast
Fibroblast
histiocyte
odontoblast

Back 38

Ameloblast- it is not included in tooth pulp

Front 39

Where do pulp stones form

Back 39

Pulpal Wall

Front 40

Dentin contains tubules within which normally are the cytoplasmic processes of

Back 40

odonotoblasts

Front 41

The tissue of the pulp is composed mostly of

Back 41

Fibrocytes

Front 42

The pulp is derived from the

Back 42

Dental papilla

Front 43

Cementum has a similar inorganic matter to that of

Back 43

Bone

Front 44

What percentage of dentin is inorganic

Back 44

70%

Front 45

The most commonly occurring process following tooth eruption

Secondary dentin
intraglobular dentin
pulp stone in pulp canal
Denticle in pulp chamber

Back 45

Secondary dentin

Front 46

If all of the cells of the tooth pulp die, the tooth will most likely

Back 46

No longer form dentin

Front 47

The possible locations of parts of an odontoblast include

Back 47

Lining of pulp, dentinal tubule, enamel spindle

Front 48

Terms that mean the same as reactive dentin

Back 48

reparative dentin, irregular dentin

Front 49

This tooth tissue looses its formative cells upon eruption

Back 49

Enamel

Front 50

After the loss of the dentinal fiber, a dentinal tubule that has filled in with other matter is called

Back 50

Sclerotic dentin

Front 51

The cell which produces dentin is called

Back 51

Odontoblasts

Front 52

The dentinoenamel junction is where the enamel meets ________ dentin

Back 52

Primary dentin

Front 53

Pulp stones are only found in the...

Back 53

Pulp

Front 54

The most newly formed cementum is located nearest to the

Back 54

Periodontal ligament

Front 55

The one tooth tissue that ectoderm forms

Back 55

Enamel

Front 56

Denticles will not cause this problem

Difficult root canal
Restriction of pulpal blood flow
rampant tooth decay

Back 56

Rampant tooth decay- pulpal stones do not cause this.

Front 57

An odontoblast fiber is normally inside a dentinal tubule

Back 57

True

Front 58

Incompletely calcified areas in dentin such as these may cause extra sensitivity

Back 58

Tome's granular layer and interglobular denting

Front 59

Rapid spread of caries is most likely in this tooth tissue

Back 59

dentin

Front 60

The cells that form enamel

Back 60

Ameloblasts

Front 61

An individual unit of enamel is formed in this pattern of formation

Back 61

Enamel Rod

Front 62

Odontoblasts differentiate from mesenchymal cells in the

Back 62

Dental papilla

Front 63

Proof that cementum develops after enamel is that it

Back 63

may overlap enamel

Front 64

Cementum has a _________ % of organic material that enamel

Back 64

higher- Cementum 23% organic plus 12% water
Enamel 4%

Front 65

Cellular cementum is usually only found near the _____ portion of the tooth

Back 65

Apical portion of the root

Front 66

Tome's granular layer represents areas of incomplete calcification in the root portion of dentin adjacent to the

Back 66

Cementum

Front 67

Enamel rods are perpendicular to the

Back 67

Dentino enamel junction

Front 68

The cell bodies which contain the nucleus of odontoblast cells reside in the

Back 68

pulp

Front 69

Cementum can protect the tooth root from

Back 69

External resorption ( the outer surface of dentin)

Front 70

The cell which forms cementum and is not yet within a lacunae is called a

Back 70

Cementoblast

Front 71

Cementum is derived from the cells that differentiated from

Back 71

Periodontal ligament

Front 72

Cementum is thinnest at

Back 72

The cervical portion of the root

Front 73

All portions of the tooth where dentin is found include the

Back 73

Root and crown

Front 74

All portions of the tooth where cementum is primarily found includes the

Back 74

Root

Front 75

Cementocytes are cells which are found within

Back 75

Cellular cementum

Front 76

________ dentin represents areas of hypomineralization between globules of mineralized dentin

Back 76

Interglobular

Front 77

Newly forming semi mineralized dentin is called

Back 77

Predentin or dentinoid

Front 78

Secondary dentin is that dentin which is produced

Back 78

After eruption or apical closure of the root

Front 79

Which group of periodontal ligament fibers will be the ones to most resist chewing forces of biting straight down

Back 79

oblique

Front 80

What is not a function of the PDL?

Shock absorber
reformation of cementum and/ or bone
sense pressure on tooth
reformation of dentin

Back 80

Reformation of dentin

Front 81

Which is not involved with tissue reformation during orthodontic movement of a tooth?
Osteoblast
Osteoclast
Odonontoblast
PDL

Back 81

Odontoblast