Chapter 6 Midterm Questions

Question 1

What does the pre eruptive phase include?

Answer 1

all movements of primary and permanent tooth crowns from the time of their early initiation and formation to the time of crown completion (phase finished with early initiation of root formation)

Question 2

What is the pre eruptive phase?

Answer 2

movements related to tooth eruption (begin during crown formation and require adjustments relative to the forming bony crypt)

Question 3

What is the functional eruptive phase?

Answer 3

phase in which teeth reach incisal or occlusal contact and then undergo functional eruptive movements, which include compensation for jaw growth and occlusal wear of the enamel

Question 4

True or False

The ruffled border greatly increases the surface area of the osteoclast and allows the cell to function maximally in bone resorption

Answer 4

True

Question 5

True or False

Fibers of the periodontal ligament separate into groups oriented about the gingiva, alveolar crest, and alveolar surface around the root

Answer 5

True (fibers stabilize the tooth to a greater degree, and blood vessels become more highly organized in the spaces between the bundles of fibers)

Question 6

What is shedding?

Answer 6

loss of primary dentition caused by the physiologic resorption of the roots, loss of the bone supporting structure, and therefore the inability of these teeth to withstand the masticatory forces

Question 7

What is the largest pulp horn in the primary molars?

Answer 7

mesiobuccal pulp horn

second largest is the mesiolingual pulp horn

Question 8

What is the usual location of accessory canals in primary teeth?

Answer 8

furcation zone (in permanent teeth at the apical one third of the completed root)

Question 9

True or False

Tooth-size differences are critical in assessment of potential space for permanent teeth to erupt into alignment

Answer 9

True