Ex 2- Eruption + Shedding

Question 1

______ is the movements a tooth makes to attain and maintain its position in the jaw

Answer 1

Eruption

Question 2

Physiologically, a tooth will move in all directions except _______ to attain and maintain its position in the jaw.

Answer 2

apically

Question 3

Normally tooth movement occurs _______ ______

Answer 3

throughout life

Question 4

The movements of eruption are a cellular activity involving different cell types of the periodontal ligament (PDL); _____ , _______, ______ and ______

Answer 4

cementoblasts
osteoblasts
osteoclasts
fibroblasts

Question 5

________ are from bone marrow and resorb bone when teeth move w/ ortho

Answer 5

osteoclasts

Question 6

________ is the most numerous cell of the PDL, is thought to play a role in tooth movement

Answer 6

fibroblasts

Question 7

Fibroblasts within the PDL _____ and ______ extracellular substance. They also may become contracting cells _____ ________

Answer 7

secrete
lyse (fibroclast)
fibromyocte myofibroblast

Question 8

Fibromyocte myofibroblast is a cell that is connected to principal collagen bundles that connect the tooth to ______ _____, when it contracts the ______ ______ contract moving the _______

Answer 8

alveolar bone
collagen fibers
tooth

Question 9

What are the three stages of eruption?

Answer 9

Preemergence
Prefunctional
Functional

Question 10

During the preemerence stage of eruption the main direction of movement is _______

Answer 10

facially (dentin + enamel forming)

*keeping pace w/ growing jaw

Question 11

During the prefunctional stage of eruption the main direction of movement is _________

Answer 11

occlusally

Question 12

During the functional stage of eruption the main direction of movement is ________

Answer 12

mesially

Question 13

________ stage starts with the appearance of dental lamina and continues to the appearance of reduced enamel epithelium and Hertwig’s root sheath, just prior to start of root dentin formation

Answer 13

preemergence

Question 14

During the primary tooth germ and secondary dental lamina stages the main direction of movement is ________

Answer 14

facially

Question 15

After enamel formation is complete 4 cell layers of enamel organ become _______ _______ ________

Answer 15

reduced enamel epithelium

Question 16

Cervical loop is where outer and inner layers of enamel organ come from to form ______ ______ ____ _____

Answer 16

Hertwig’s epithelial root sheath

Question 17

Reduced enamel epithelium is attached to completed enamel surface by a ____ ______ the last secretion of ameloblasts

Answer 17

basal lamina

Question 18

What are the 2 main functions of Hertwig’s epithelial root sheath?

Answer 18

• Determines # root canals of tooth

- Determines root dentin outline

Question 19

Bone crypts undergo remodeling and become the ______ ______

Answer 19

alveolar process

Question 20

________ stage starts with root dentin formation and ends when tooth reaches _______ plane

Answer 20

Prefunctional

occlusal

Question 21

The main direction of movement during the prefunctional stage is _______

Answer 21

occlusally

Question 22

Hertwig’s Epithelial root sheath covers root dentin and determines root dentin outline, the apical end continues as _____: determines number of ______ _____

Answer 22

diaphragm

root canals

Question 23

Reduced enamel epithelium is over ________ enamel

Answer 23

immature

Question 24

During Hertwig’s epithelial root sheath diagram stage the number of root canals are determined: the tooth erupts ____ from this level

Answer 24

occlusally

Question 25

When hertwig's epithelial root sheath elongation he ______ ______ outline is determined and the diaphragm remains at relatively the same level

Answer 25

root dentin

Question 26

After root dentin forms ______ breaks up: ______ forms on exposed dentin. This sequence continues ______ until root dentin is completed

Answer 26

sheath cementum apically

Question 27

_____ ______ ___ ______ are remnants of epithelial cells from Hertwig's root sheath in the periodontal ligament; appearing during the prefunctional stage of eruption

Answer 27

Epithelial rest of Malassez (can causes cysts to form)

Question 28

During the prefunctional stage of eruption, the merged oral epithelium and reduced enamel epithelium undergo _____ ____ because there is no blood supply. The coronal most part emerges into the _____ ____

Answer 28

cell death | oral cavity

Question 29

Reduced enamel epthelium becomes _______ _______

Answer 29

junctional epithelium

Question 30

Junctional epithelium is attached to the tooth surface by a ____ _____ (acts as a double basal lamina)

Answer 30

basal lamina

Question 31

Collagen fibers bundles of PDL are _____ functionally arranged in groups but are arranged _____

Answer 31

NOT | obliquely

Question 32

The ______ ____ of eruption starts at the occlusal plane and physiologically continues throughout life

Answer 32

functional stage

Question 33

The main movement during the functional stage of eruption is ______

Answer 33

mesially (physiologic mesial drift)

Question 34

________ _______ attachment position changes during functional eruption

Answer 34

junctional epithelium

Question 35

What are the changes to the jucntional epithelium during functional eruption?

Answer 35

-attached to enamel -attached to enamel + cementum -attached to cementum (physiologic passive eruption)

Question 36

Functional arrangement of principal fiber bundles of _____ occurs during _____ stage of eruption

Answer 36

PDL | functional

Question 37

During the functional stage of eruption what 3 changes occur in dentin?

Answer 37

- attrition - dead tracts - reparative (tertiary) dentin

Question 38

During the functional stage of eruption there is continued ______ formation, reduced _____ tissue volume and ______ mineralization

Answer 38

dentin pulp ectopic

Question 39

______ ______ occurs between the junctional epithelium and adjacent connective tissue (lamina propria)

Answer 39

reciprocal induction

Question 40

Dental lamina --> ______ --> cap --> bell --> _______ ---> Hetwig's sheath --> merger -->________ _______ --> occlusal plane

Answer 40

bud apposition junctional epithelium

Question 41

_______ is the physiologic elimination of primary teeth caused by the resorptive action of __________

Answer 41

shedding | odontoclasts

Question 42

Odontoclasts originate in ______ ______ and conveyed to the site by ______ _____

Answer 42

bone marrow | blood vessels

Question 43

Odontoclasts resorb the ___ mineralized tissues of teeth

Answer 43

3

Question 44

If reduced enamel epithelium comes in close contact w/ osteoclast cells what would occur?

Answer 44

protective reduced enamel epithelum breaks down and enamel can be damaged