Final- Embryology and Histology

Question 1

Of the following tissues, which one or more have nerve innervations?

Answer 1

pulp and periodontal ligament

Question 2

Because of the proximity of odontoblastic cell bodies to nerve terminal endings in the tooth, clinical exposure of dentin may result in sensitivity. What is the location of the odontoblastic bodies?

Answer 2

pulp

Question 3

The tooth structure loss that occurs from pathologic wear of teeth by foreign substances is called:

Answer 3

abrasion

Question 4

Bone loss is noted on the periapical radiograph of the mandibular incisors. the crest of the alveolar bone is usually apical to the cementoenamel junction(CEJ) by

Answer 4

0.75 to 1.49 mm

Question 5

The tissue lining of an unhealthy gingival sulcus consists of:

Answer 5

nonkeratinized epithelium with rete pegs (rete ridges)

Question 6

The bottom of the gingival sulcus is marked by the

Answer 6

junctional epithelium

Question 7

Which of the following tissues have little or no keratinization?

Answer 7

sulcular epithelium

Question 8

What does bleeding caused by probing indicate?

Answer 8

ulceration of crevicular epithelium

Question 9

Which of the following tissue changes result in erythematous gingiva?

Answer 9

increased vascularization

Question 10

What type of connective tissue underlies the epithelium of the gingiva?

Answer 10

fibrous

Question 11

In gingivitis, poor tissue tone is caused by:

Answer 11

destruction of collagen fibers

Question 12

Definitive diagnosis of furcation involvement is made by:

Answer 12

clinical probing

Question 13

Enamel projections on the root surface are attributed to the differentiation of:

Answer 13

Hertwig’s epithelial root sheath

Question 14

Hertwig’s epithelial root sheath is entirely composted of:

Answer 14

inner and outer enamel epithelium

Question 15

When is root formation completed?

Answer 15

1 to 4 years after eruption

Question 16

Remnants of Hertwig’s epithelial root sheath found in the periodontal ligament of a functioning tooth are called:

Answer 16

rests of Malassez

Question 17

The stippled texture of the gingiva may be attributed to:

Answer 17

connective tissue projections

Question 18

The color of gingiva may be attributed to all the following EXCEPT one. Which one is the EXCEPTION?

Answer 18

connective tissue projections

Question 19

During orthodontic treatment, pressure applied to the periodontal ligament is intended to produce bone formation. Pressure on the periodontal ligament stimulates bone formation.

Answer 19

Both statements are FALSE

Question 20

A specialized periosteum which forms and resorbs bone is called:

Answer 20

periodontal ligament

Question 21

Cementum resorbs less readily than does bone. Cementoid, the outer, less calcified layer of cemental tissue, results in cementum resorbing less readily than bone.

Answer 21

Both statements are TRUE

Question 22

Cementum is a product of:

Answer 22

periodontal ligament

Question 23

The outer, less calcified layer of cementum is called:

Answer 23

cementoid

Question 24

Which of the following cells does the periodontal ligament contain?

Answer 24

osteoclasts and cementoblasts

Question 25

During orthodontic treatment, the maxillary right canine and the first premolar were moved labially outside of the outer cortical plate. A cleft-like absence of the alveolar cortical plate resulting in a denuded root surface is called:

Answer 25

dehiscence

Question 26

Which of the following are characteristics of bundle bone (the alveolar bone proper)?

Answer 26

adjacent to the periodontal ligament and containing Sharpey's fibers

Question 27

Which of the following tissues of the normal periodontium is the alveolar bone directly adjacent to?

Answer 27

periodontal ligament and gingival connective tissue

Question 28

Alveolar bone is the most stable of all periodontal tissues. Pressures used in orthodontic treatment encourage bone to be stable.

Answer 28

Both statements are false.

Question 29

Through tooth movement, the periodontal ligament fibers must be reoriented. the cells that are important in the formation of principle fibers of the periodontal ligament are:

Answer 29

fibroblasts

Question 30

The types of epithelia found lining the oral cavity include:

Answer 30

keratnized and nonkeratinized stratified squamous

Question 31

Epithelial tissues are characterized by:

Answer 31

little intercellular substance and many cells

Question 32

Embryonically, the mandible is derived form:

Answer 32

first branchial arch

Question 33

The anterior portion, or body, of the tongue develops from the:

Answer 33

mandibular process

Question 34

One of the first structures of the face to develop in the primitive embryo is the:

Answer 34

stomodeum

Question 35

The lateral palatine processes initially grow downward toward the future floor of the mouth. This is caused by the presence of the:

Answer 35

tongue

Question 36

When a cleft of the alveolar process is present, it occurs between the:

Answer 36

lateral incisors and canine

Question 37

The cementum is derived from:

Answer 37

dental sac

Question 38

During embryonic development, neural crest cells migrate to the branchial arches and surround the:

Answer 38

mesoderm

Question 39

All the following tooth tissues were derived from the mesoderm EXCEPT one. Which one is the EXCEPTION?

Answer 39

enamel

Question 40

Which of the following is NOT part of the enamel organ?

Answer 40

dental papilla

Question 41

The periodontal ligament is derived from the:

Answer 41

dental sac

Question 42

Dentin is the product of:

Answer 42

dental papilla