Deck 8: Oral Embryology and Histology

Question 1

The genetic factor that is most often of concern during prenatal tooth development is:

A)failure of the enamel to form properly.
B)failure of the dentin to form properly.
C)discrepancies in tooth and jaw size.
D)Down syndrome.

Answer 1

discrepancies in tooth and jaw size.

Question 2

The portion of the tooth that is visible in the mouth is the:

A)root.
B)clinical crown.
C)anatomic crown.
D)cementum.

Answer 2

clinical crown.

Question 3

Oral mucosa is composed of which of the following types of epithelium?

A)Cuboidal
B)Simple squamous
C)Stratified squamous
D)Ciliated pseudostratified columnar

Answer 3

Stratified squamous

Question 4

Which of the following constitutes the bulk of the tooth?

A)Pulp
B)Apex
C)Enamel
D)Dentin

Question 5

________ mucosa is noted for its soft texture,moist surface,and ability to stretch and be compressed?

A)Masticatory
B)Lining
C)Specialized
D)Gingival

Question 6

Embryology is the study of prenatal development throughout the:

A)embryonic period.
B)stages before birth.
C)ninth week up until birth.
D)the first week after fertilization.

Question 7

The first signs of tooth development are found in which of the following regions of the developing embryo?

A)Maxillary anterior
B)Maxillary posterior
C)Mandibular anterior
D)Mandibular posterior

Question 8

Which of the following is the name for the periodontal ligament fibers that are embedded in cementum and bone?

A)Gingival fibers
B)Sharpey's fibers
C)Interradicular fibers
D)Lamina dura

Question 9

Histology is the study of the _______ of the body.

A)microscopic structure and function
B)structure
C)prenatal development
D)function

Question 10

Which of the following types of cells form new bone?

A)Osteoblasts
B)Osteoclasts
C)Osteocytes
D)Fibroblasts

Question 11

Radicular pulp:

A)is the part of the pulp that lies within the crown portion of the tooth.
B)includes extensions of the pulp that project toward the cusp tips and incisal edges.
C)is continuous with tissues of the periapical area through the apical foramen.
D)is coronally located and becomes wider during development of the root.

Question 12

The periodontal ligament connects the ______ of the tooth to the alveolar bone.

A)cementum
B)dentin
C)apical foramen
D)inner enamel epithelium

Question 13

Anything that surrounds the apex of a tooth is known as:

A)endodontic.
B)periodontic.
C)periapical.
D)circumferential.

Question 14

The adult second premolar that replaces a primary second molar is called a(n)_________ tooth.

A)odontoblast
B)crown
C)succedaneous
D)exfoliation

Question 15

The __________ is the dense outer covering of the bone of the alveolar process and provides strength for the place where skeletal muscles attach.

A)bony projection
B)alveolar process
C)cortical plate
D)lamina dura

Question 16

Every tooth consists of a _______ and one or more roots.

A)superstructure
B)crown
C)frame
D)foundation

Question 17

The _________ of the erupting tooth fuses with the oral epithelium during active tooth eruption and provides a pathway for the erupting tooth.

A)dental sac
B)cementoenamel junction
C)reduced enamel epithelium

Question 18

Which of the following is the correct sequence of the periods of prenatal development?

A)Blastula, gastrula, and morula periods.
B)Preimplantation, embryonic, and fetal periods.
C)Implantation, ectodermal, and fetal periods.
D)Conception, zygote, and embryonic periods.

Question 19

Dentin is formed by which of the following types of cells?

A)Osteoblasts
B)Odontoblasts
C)Cementoblasts
D)Ameloblasts

Question 20

Formation of the dental lamina starts during which of the following growth periods of tooth development?

A)Bud
B)Cap
C)Bell
D)Histodifferentiation

Question 21

Which of the following is the correct sequence for the growth periods of a tooth?

A)Bud, cap, bell
B)Bell, cap, bud
C)Cap, bud, bell
D)Bell, bud, cap

Question 22

The buds for the third molars form at approximately:

A)17 weeks.
B)6 months before birth.
C)6 months after birth.
D)5 years after birth.

Question 23

The crown of the tooth is covered with:

A)cementum.
B)dentin.
C)enamel.
D)pulp.

Question 24

Formation has begun on all primary dentition at ______ month(s).

A)1
B)2
C)3
D)4

Question 25

The development of a supernumerary (extra)tooth is considered to be due to which of the following causes?

A)Teratogen
B)Hereditary
C)Displacement
D)Toxin

Question 26

Fungiform papillae and their associated taste buds are considered a part of which of the following types of mucosa?

A)Specialized
B)Lining
C)Gingival
D)Masticatory

Question 27

The cells differentiate and become specialized in a process called ______ during the bell stage of tooth formation.

A)initiation
B)proliferation
C)histodifferentiation
D)morphodifferentiation

Question 28

_________ is movement of the tooth into its functional position in the oral cavity.

A)Attrition
B)Eruption
C)Exfoliation
D)Remodeling

Question 29

The face begins to develop during the fourth week of pregnancy within the _______ period.

A)preimplantation
B)embryonic
C)fetal
D)proliferative

Question 30

Odontogenesis is the process of tooth:

A)calcification.
B)formation.
C)eruption.
D)exfoliation.

Question 31

During the bell stage of tooth development,the ________ form enamel.

A)ameloblasts
B)odontoblasts
C)cementoblasts
D)fibroblasts

Question 32

Which of the following dental developmental disturbances occurs when the enamel organ invaginates into the dental papilla?

A)Gemination
B)Microdontia
C)Anodontia
D)Dens in dente

Question 33

Generally,the first primary teeth to erupt into the mouth are the:

A)maxillary central incisors.
B)mandibular central incisors.
C)maxillary first molars.
D)mandibular first molars.

Question 34

Why is the mother's dental health during pregnancy a concern for the baby?

A)It is a genetic factor.
B)Maternal infection can harm the child.
C)It can cause tooth and jaw size discrepancies.
D)The mother does not affect the dental health of the baby.

Question 35

Teeth form from which of the following primordial layer(s)?

A)Ectoderm
B)Mesoderm
C)Endoderm
D)Ectoderm and mesoderm

Question 36

Which of the following periods of prenatal development extends from the beginning of the second week until the end of the eighth week?

A)Embryonic
B)Fetal
C)Preimplantation
D)Zygote

Question 37

Fusion of the palate begins from the _________ during the ________week.

A)anterior; ninth
B)anterior; twelfth
C)posterior; ninth
D)posterior; twelfth

Question 38

Which of the following correctly depicts the sequence of primary tooth development?

A)Mandibular anterior then mandibular posterior
B)Mandibular anterior then maxillary anterior
C)Maxillary anterior then maxillary posterior
D)Maxillary anterior then mandibular posterior

Question 39

Which statement is not true about teratogens?

A)Teratogens may cause birth defects.
B)Drinking alcohol during pregnancy is considered a teratogen.
C)Taking antibiotics during pregnancy could be considered a teratogen.
D)Teratogens are genetic factors that are passed from generation to generation.

Question 40

Which statement is true of succedaneous teeth?

A)All permanent teeth are succedaneous teeth.
B)Succedaneous teeth begin forming after birth.
C)Succedaneous teeth are only permanent molars.
D)Succedaneous teeth are permanent teeth that replace primary teeth.

Question 41

Which statement is not true of dentin?

A)Dentin composes the main portion of the tooth structure.
B)Dentin extends almost the entire length of the tooth.
C)Dentin is characterized by Hunter-Schreger bands.
D)Dentin is capable of growth and repair.

Question 42

Enamel is ________ and ranges in color from yellow to grayish white.

A)opaque
B)translucent
C)transparent
D)composed of dentinal tubules

Question 43

Which of the following is the most reliable indicator of periodontal disease?

A)The alveolar socket around the entire crown of the tooth is resorbing.
B)The alveolar process is increasing in size and shape.
C)The periodontal ligament is narrowing.
D)The alveolar crest is flattening out.

Question 44

The muscles of mastication are formed by the _______ branchial arch.

A)first
B)second
C)fourth
D)sixth

Question 45

What is the difference between secondary dentin and tertiary dentin?

A)Secondary dentin forms before the tooth erupts and continues forming during the life of the tooth while tertiary dentin forms after eruption, composing the bulk of the tooth.
B)Secondary dentin forms after the tooth is erupted as a response to irritation, whereas tertiary dentin appears within the wall of the pulp chambers.
C)Tertiary dentin forms as a response to irritation.
D)Secondary dentin forms on the apical half of the root, whereas tertiary dentin does not.

Question 46

The attachment apparatus that retains the tooth in its functional position in the jaw includes the cementum,alveolar process,and:

A)enamel.
B)apical foramen.
C)periodontal ligament.
D)dentin.

Question 47

Which of the following is true of cementum?

A)Provides sensation to the tooth
B)Overlies root dentin
C)Forms the bulk of the tooth
D)Transmits pain stimuli from the tooth

Question 48

The periodontium supports the teeth within the:

A)alveolar process.
B)cementum.
C)periodontal ligament.
D)enamel prism.

Question 49

Pulp is made up of blood vessels and nerves that enter the pulp chamber through the:

A)coronal pulp.
B)apical foramen.
C)pulp horns.
D)root pulp.