Chapter 8 Test Review

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

Mandibular anterior

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.

Maternal infection can harm the child.

Dentin is formed by which of the following types of cells? A. Osteoblasts B. Odontoblasts C. Cementoblasts D. Ameloblasts

Odontoblasts

Which of the following types of cells remove bone? A. Osteoblasts B. Osteoclasts C. Osteocytes D. Fibroblasts

Osteoclasts

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

Overlies root dentin

Which of the following periods of prenatal development takes place during the first week? A. Embryonic B. Fetal C. Preimplantation D. Zygote

Preimplantation

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.

Preimplantation, embryonic, and fetal periods.

Which of the following processes is common to all of the bud, cap, and bell stages of tooth development? A. Proliferation B. Differentiation C. Morphogenesis D. Induction

Proliferation

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

Sharpey's fibers

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

Specialized

Oral mucosa is composed of which of the following types of epithelium? A. Cuboidal B. Simple squamous C. Stratified squamous D. Ciliated pseudostratified columnar

Stratified squamous

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.

Succedaneous teeth are permanent teeth that replace primary teeth.

The dentition of a 5-year-old child, ±9 months, would contain A. all primary teeth and first permanent molars erupting. B. all primary teeth with first permanent molars fully erupted. C. all primary teeth. D. None of the above

all primary teeth.

The periodontium supports the teeth within the A. alveolar process. B. cementum. C. periodontal ligament. D. enamel prism.

alveolar process.

Enamel-producing cells are called A. ameloblasts B. ameloclasts C. odontoblasts D. odontoclasts

ameloblasts

Fusion of the palate begins from the _________ during the ninth week and is completed during the ________ week within the fetal period. A. anterior; tenth B. anterior; twelfth C. posterior; tenth D. posterior; twelfth

anterior; twelfth

An enamel rod is composed of A. calcified enamel prisms. B. 99% inorganic matter. C. hydroxyapatite. D. All of the above

calcified enamel prisms.

The periodontium connects the ______________ of the tooth to the alveolar bone. A. cementum B. dentin C. apical foramen D. inner enamel epithelium

cementum

The root of the tooth is covered with A. cementum. B. dentin. C. enamel. D. pulp.

cementum.

The portion of the tooth that is visible in the mouth is the A. root. B. clinical crown. C. anatomic crown. D. cementum.

clinical crown.

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

cortical plate

The compact bone that lines the tooth socket is known as the A. alveolar crest. B. cortical plate. C. lamina dura. D. trabeculae.

cortical plate.

Every tooth consists of a ______________ and one or more roots. A. superstructure B. crown C. frame D. foundation

crown

The shedding of a primary tooth is called A. exfoliation. B. odontogenesis. C. calcification. D. remodeling.

exfoliation.

The face and its related tissues begin to form during the A. first week of prenatal development. B. first month of prenatal development. C. fourth month of prenatal development. D. fourth week of prenatal development.

fourth week of prenatal development.

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

histodifferentiation

The primary purpose of ____________, the fiber group of the periodontal ligament, is to aid in resisting tipping and twisting of the tooth. A. alveolar crest B. horizontal C. interradicular D. apical

interradicular

Histology is the study of the __________________ of the body. A. microscopic structure and function B. structure C. prenatal development D. function

microscopic structure and function

Anything that surrounds the apex of a tooth is known as A. endodontic. B. periodontic. C. periapical. D. circumferential.

periapical.

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.

periodontal ligament.

Embryology is the study of A. cell development. B. structure and function at the microscopic level. C. prenatal development prior to birth. D. postnatal development prior to age 1 year.

prenatal development prior to birth.

The structure units of enamel are called enamel A. lamellae. B. prisms. C. spindles. D. tubules.

prisms.

The innermost area of the tooth is the A. anatomic crown. B. apical foramen. C. cementoenamel junction. D. pulp chamber.

pulp chamber.

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

reduced enamel epithelium

The periodontal ligament is capable of A. repair. B. remodeling. C. resorption. D. All of the above

repair.

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.

stages before birth.

Histology is the study of A. cell development. B. structure and function at the microscopic level. C. prenatal development prior to birth. D. postnatal development prior to age 1 year.

structure and function at the microscopic level.

The adult second premolar that replaces a primary second molar is called a(n) _____________ tooth. A. odontoblast B. crown C. succedaneous D. exfoliation

succedaneous

Down syndrome, fetal alcohol syndrome, and endogenous tetracycline stain of the teeth are examples of a A. congenital malformation. B. developmental disturbance. C. drug ingestion during the fetal period. D. All of the above

All of the above

Ectoderm differentiates into A. hair. B. skin. C. lining of the oral cavity. D. All of the above

All of the above

Tertiary dentin A. is formed before eruption. B. forms on the wall of the pulp chamber. C. is formed in response to an irritant. D. causes a gradual narrowing of the pulp chamber with age. E. Both forms on the wall of the pulp chamber and in response to an irritant.

Both forms on the wall of the pulp chamber and in response to an irritant.

Formation of the dental lamina starts during which of the following growth periods of tooth development? A. Bud B. Cap C. Bell D. Histodifferentiation

Bud

Which of the following is the correct sequence for the growth periods of a tooth? A. Bud, bell, cap B. Bell, cap, bud C. Cap, bud, bell D. Bud, cap, bell

Bud, cap, bell

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

Dens in dente

Which of the following constitutes the bulk of the tooth? A. Pulp B. Apex C. Enamel D. Dentin

Dentin

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.

Dentin is characterized by Hunter-Schreger bands.

Teeth form from which of the following primordial layer(s)? A. Ectoderm B. Mesoderm C. Endoderm D. Ectoderm and mesoderm

Ectoderm and mesoderm

_____________ is movement of the tooth into its functional position in the oral cavity. A. Attrition B. Eruption C. Exfoliation D. Remodeling

Eruption

The main portion of the tooth structure is made up of enamel. A. True B. False

False

The portion of the pulp that lies within the crown of the tooth is the radicular pulp. A. True B. False

False

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

Mandibular anterior then maxillary anterior

The external human face develops from the frontonasal process and which of the following branchial arches? A. 1 B. 2 C. 3 D. 4

1

The buds for the first permanent molars form at approximately A. 17 weeks of fetal life. B. 6 months before birth. C. 6 months after birth. D. 5 years after birth.

17 weeks of fetal life.

Dentin A. is capable of regeneration. B. forms the bulk of the tooth. C. is an excellent thermal conductor. D. All of the above

All of the above

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

Hereditary

___________ mucosa is noted for its soft texture, moist surface, and ability to stretch and be compressed? A. Masticatory B. Lining C. Specialized D. Gingival

Lining

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.

Teratogens are genetic factors that are passed from generation to generation.

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.

Tertiary dentin forms as a response to irritation.

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.

The alveolar crest is flattening out.

The oral epithelium will form which of the following during the cap stage of tooth development? A. The enamel organ B. The dental papilla C. The dental sac D. The dentinoenamel junction

The enamel organ

Enamel that has lost calcium due to the remineralization process can become remineralized. A. True B. False

True

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.

apical foramen.

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.

discrepancies in tooth and jaw size.

The earliest signs of tooth development appear A. during the second trimester. B. during the third month in utero. C. immediately following birth. D. during the first trimester.

during the first trimester.

The face begins to develop during the fourth week of pregnancy within the ___________ period. A. preimplantation B. embryonic C. fetal D. proliferative

embryonic

The hardest calcified substance in the body is A. bone. B. cementum. C. dentin. D. enamel.

enamel.

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.

is continuous with tissues of the periapical area through the apical foramen.

The mucosa noted for a soft texture, a moist surface, and an ability to cushion underlying structures is A. masticatory mucosa. B. lining mucosa. C. specialized mucosa. D. None of the above

lining mucosa.

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.

mandibular central incisors.

Tooth enamel is formed in the A. ectodermal embryonic layer. B. mesodermal embryonic layer. C. endodermal embryonic layer. D. None of the above

mesodermal embryonic layer.

The posterior portion of the tongue is formed by the ___________ branchial arch. A. first B. second C. third D. fourth

third

Enamel is _______________ and ranges in color from yellow to grayish white. A. opaque B. translucent C. transparent D. composed of dentinal tubules

translucent

The division of a tooth root into three roots is called A. bifurcation. B. trifurcation. C. dentinogenesis imperfecta. D. exfoliation.

trifurcation.