DH 1350 Quiz 12 Chap 13

Which cells are responsible for producing dentin?

Ameloblasts
Cemetoblasts
Odontoblasts
Osteoblasts

Dentin can be removed by dental hygiene
instrumentation.

True
False
True False

Dentin develops from which of the following embryonic tissues?

Ectoderm
Ectomesenchyme
Endoderm
Mesoderm
Ectomesenchyme AND Mesoderm
Ectomesenchyme AND Endoderm

Which of the following WILL NOT be found in the dentinal tubule?

Afferent Axon
Dentinal Fluid
Efferent Axon
Odontoblastic Process

The mineral content of enamel and dentin are, respectively: 

96% and 70%
80% and 70%
96% and 60%
90% and 50%

In the process of dentin maturation,
_______________ mineralization is when calcium hydroxyapatite crystals form as
globules that calcify and expand, but do not fuse completely.

Dentin is on the average about _____ %
mineralized by weight.

50
65
70
96

Match the following terms with their descriptors:

peritubular dentin
mantle dentin
circumpulpal dentin
intertubular dentin

makes up the bulk of the tooth having collagen fibers arranged parallel to the DEJ

is very prevalent in mantel dentin

found between the dentinal tubules

first predentin to form having fibers perpendicular to the CEJ

The peritubular dentin that is found
surrounding each odontoblastic process is:

not true dentin
less calcified than intertubular dentin
more calcified than intertubular dentin
not different from intertubular dentin

The _____ fluid in the tubule is presumably tissue fluid surrounding the cell membrane of the odontoblast.

Like enamel, dentin is avascular.

True
False
True False

Of the two types of curvature established by the direction of the denitnal tubules over time, _____curvature resemlbes a large "S"-shaped curve.

Whether it is touch, hot, cold, or any other stimulus, the nerves of a tooth only translate the message to the brain as _________.

Match the following terms with their descriptors:

primary dentin
secondary dentin
tertiary dentin

continues to form throughout life of the tooth

formed before completion of the apical foramen

formed quickly with an irregular pattern of tubules

In which location is the cell body of the odontoblast found in a mature, healthy  erupted tooth?

along the dentinoenamel junction
in the outer pulpal wall
near the dentinocemental junction
within the pulpal core
along the cementoenamel junction

Match the following terms with their descriptors:

imbrication lines of von ebner
contour lines of owen
tome's granular layer

demonstrate a disturbance in body  metabolism that affects the odontoblasts by altering their formation efforts

spotty microscopic appearance found adjacent to the DCJ

incremental lines that can be likened to growth rings of trees

The ___________ pulp is in the crown are of the tooth, while ___________ pulp is in the root(s) of the tooth.

Which of the following features of the pulp will make endodontic therapy more difficult?

Accessory Canals Only
Pulp Stones Only
Apical Foramen Only
Pulp Horns Only
Pulp Stones & Accessory Canals
Apical Foramen & Pulp Horns

Which cell type is most prominent in the pulp?

Odontoblasts
Fibroblasts
Red Blood Cells
Neurons

During cavity preparation of a tooth, care MUST be taken to preserve the:

Enamel rod fluid
Support of the dentinal tubules
Cemental vascularity
Vitality of the pulp

The dentin and pulp share many of their
functions, which of the folowing is ONLY accomplished by the PULP?

Formation of Dentin
Sensory
Protective
Nutritional

List two (2) causes of pulpitis ____  and ____ .

MULTIPLE ANSWERS

Which of the following descriptors describe what happens to dentin with increased age?

Becomes more translucent

Diameter of the dentin tuble increases/widens

sensitivty to simtulation

Odontoblats have increased organelle content

More exposure due to attrition and gingival recession

Which of the following pulp structures is formed when Hertwig’s epithelial root sheath encounters a blood vessel?

pulp horn
pulp chamber
apical foramen
accessory canal
odontoblastic layer

Which of the following terms associated with dentin can be used to CORRECTLY describe the largest portion of the tooth’s dentin?

Tomes’ granular layer
mantle dentin
circumpulpal dentin
interglobular dentin
peritubular dentin

MULTIPLE ANSWERS

Which of the following are characterisitics
of the developmental disturbance  dentinogenesis imperfecta?

A type of dentin dysplasia

Teeth appear blue-gray or brown

Teeth lack an opalescent sheen

The apposition and maturation of enamel is normal

There is severe atrrition due to the prevalence of globular dentin

Which of the following describes a pronounced band due to the trauma of birth present on the cross section of both enamel and dentin?

line of Retzius
imbrication line of von Ebner
neonatal line
contour line of Owen
perikymata