Deck 8: Oral Embryology and Histology

Question 1

The term _____ is used for a permanent tooth that replaces a primary tooth.

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

Answer 1

succedaneous

Question 2

Every tooth is divided into:

A)enamel and dentin.
B)crown and root.
C)clinical crown and anatomic crown.
D)cementum and root.

Answer 2

crown and root.

Question 3

The tissue that covers the inside of the cheeks,vestibule,lips,soft palate,and ventral surface of the tongue is called _____ mucosa.

A)masticatory
B)lining
C)specialized
D)gingival

Answer 3

lining

Question 4

The movement of the teeth into their functional positions in the oral cavity is known as:

A)exfoliation.
B)eruption.
C)tooth growth.

Question 5

The tapered end of each root tip is known as the:

A)anatomic crown.
B)clinical crown.
C)apex.
D)CEJ.

Question 6

The _____ within the periodontium.

A)cementum connects the alveolar bone and periodontal ligaments
B)alveolar bone connects the cementum and periodontal ligaments
C)periodontal ligaments connect the cementum and alveolar bone
D)cemento-enamel junction connects the alveolar bone and periodontal ligaments

Question 7

The process of laying down new bone is called _____; it is accomplished by cells called _____.

A)deposition; osteoblasts
B)deposition; osteoclasts
C)resorption; osteoblasts
D)resorption; osteoclasts

Question 8

_____ is the living tissue of the tooth,made up of blood vessels and nerves.

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

Question 9

The embedded portions of the periodontal ligament fibers that connect the cementum of the tooth and the bone are called:

A)Sharpey's fibers.
B)gingival fibers.
C)interradicular fibers.
D)lamina dura.

Question 10

Oral mucosa is composed of _____ epithelium overlying connective tissue.

A)cuboidal
B)simple squamous
C)stratified squamous
D)ciliated pseudostratified columnar

Question 11

The portion of the tooth that is covered with enamel is the:

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

Question 12

The study of the structure and function of the tissues at the microscopic level is:

A)histology.
B)embryology.
C)anatomy.
D)physiology.

Question 13

Which of the following statements is true concerning developmental disturbances during tooth formation?

A)During prenatal tooth development, the environmental factor that is most often of concern is tooth and jaw size.
B)During prenatal tooth development, the genetic factor that is most often of concern is tooth and jaw size.
C)Developmental disturbances can be caused by genetic but not environmental factors.
D)Developmental disturbances can be caused by environmental but not genetic factors.

Question 14

When are the first signs of tooth development found in the anterior mandibular region of the developing embryo?

A)Six weeks after the baby is born
B)During the third trimester of pregnancy
C)When the embryo is five to six weeks old
D)At three months of age

Question 15

The three primary periods of odontogenesis are known as:

A)bud, cap, and bell.
B)growth, calcification, and eruption.
C)zygote, embryo, and fetus.
D)osteoblast, osteoclast, and ameloblast.

Question 16

_____ are enamel-forming cells.

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

Question 17

The extensions of the bone of the mandible and maxilla that support the teeth in their functional positions in the jaws are called:

A)bony projections.
B)alveolar processes.
C)cortical plates.
D)lamina dura.

Question 18

Radicular pulp:

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

Question 19

Embryology is the study of:

A)the body's structure.
B)prenatal development.
C)the function of the body.
D)the nervous system.

Question 20

The stages of prenatal development are:

A)ectoderm, mesoderm, and endoderm.
B)growth, bud, and cap stages.
C)preimplantation, embryonic, and fetal periods.
D)conception, zygote, and embryo.

Question 21

Which statement is NOT true of succedaneous teeth?

A)Succedaneous teeth are permanent teeth.
B)Succedaneous teeth begin forming at 12 to 14 weeks of gestation.
C)Succedaneous teeth are only permanent molars.
D)Succedaneous teeth form during the cap stage of tooth development.

Question 22

The last tooth buds to develop are for the _____ molars.

A)primary first
B)primary second
C)permanent second
D)permanent third

Question 23

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

A)maxillary anterior.
B)mandibular anterior.
C)maxillary posterior.
D)mandibular posterior.

Question 24

The primary dentition will begin to form during the _____ month of gestation.

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

Question 25

Any disruption during the formation and fusing of the palate could result in cleft:

A)lip.
B)palate.
C)both a and b.
D) neither a nor b.

Question 26

The basic shape and size of each tooth is established during the process of:

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

Question 27

If a pregnant patient has to have dental x-rays taken,the safest time to take the x-rays is after the _____ week of pregnancy.

A)first
B)third
C)sixth
D)ninth

Question 28

The teeth develop in which sequence?

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

Question 29

The process of tooth formation is:

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

Question 30

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)Women of childbearing years should avoid teratogens after the second month of pregnancy.

Question 31

During the bell stage of tooth development,the odontoblasts form:

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

Question 32

The face begins to develop during the _____ week of pregnancy.

A)first
B)fourth
C)eighth
D)twelfth

Question 33

Tooth enamel form from which embryonic layer?

A)Ectoderm
B)Mesoderm
C)Endoderm
D)None of the above

Question 34

Each tooth develops from its own tooth bud,which develops during the ____ stage of tooth development.

A)bud
B)bell
C)cap
D)none of the above

Question 35

The tough,light pink,keratinized tissue that covers the hard palate and includes the attached gingiva is _____ mucosa.

A)specialized
B)lining
C)gingival
D)masticatory

Question 36

The development of a supernumerary (extra) tooth is considered to be a(n):

A)teratogen.
B)anomaly.
C)displacement.
D)toxin.

Question 37

The mother's dental health during pregnancy is considered to be:

A)a genetic factor.
B)an environmental factor.
C)uncontrollable.
D)not a factor to the health of the baby.

Question 38

An example of a developmental disturbance that is a genetic factor where there is absence of one or more teeth is known as:

A)macrodontia.
B)microdontia.
C)anodontia.
D)dens in dente.

Question 39

The root of the tooth is covered with:

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

Question 40

The normal process of shedding or losing primary teeth is:

A)attrition.
B)eruption.
C)exfoliation.
D)none of the above.

Question 41

If a baby is born without the ability to smile,which branchial arch failed to completely form?

A)First
B)Second
C)Fourth
D)Sixth

Question 42

During an examination,the dentist discovers that a patient is in the early stages of periodontal disease.How did the dentist determine this?

A)The alveolar socket around the crown of the tooth is resorbing.
B)The alveolar process is increasing in size and shape.
C)The alveolar crest is flattening out, increasing the distance between the CEJ and the alveolar crest.
D)The periodontal ligaments are narrowing.

Question 43

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, making up the bulk of the tooth.
B)Secondary dentin forms after the tooth is erupted as a response to trauma, while tertiary dentin appears within the wall of the pulp chambers.
C)Secondary dentin forms after the tooth erupts, forming the bulk of the tooth, while tertiary dentin forms as a response to trauma.
D)Secondary dentin forms on the apical half of the root, while tertiary dentin forms within the wall of the pulp chambers.

Question 44

Blood vessels and nerves enter the pulp of the tooth through the:

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

Question 45

The attachment apparatus that retains the tooth in its functional position in the jaw includes the:

A)alveolar bone.
B)cementum.
C)periodontal ligaments.
D)all of the above.

Question 46

The primary function of cementum is to:

A)provide sensory to the tooth.
B)anchor the tooth into the bony socket.
C)form the bulk of the tooth.
D)transmit pain stimuli.

Question 47

The structure that surrounds,supports,and is attached to the teeth is the:

A)alveolar bone.
B)cementum.
C)periodontal ligament.
D)periodontium.

Question 48

Which statement is NOT true of dentin?

A)Dentin makes up the main portion of the tooth structure.
B)Dentin extends almost the entire length of the tooth.
C)Dentin is the hardest tissue in the body.
D)Dentin is capable of growth and repair.

Question 49

Variations in the shades or coloring of enamel are caused by _____ the enamel.

A)differences in the thickness of
B)translucency of
C)color of the dentin beneath
D)all of the above