DH 101 - Chapter 8 Exam with
Accurate Solutions
dentin is a - ANSWER-living, sensitive tissue not normally exposed to the oral
environmentl
dentin is - ANSWER-yellowish in contrast to enamel
dentin appears - ANSWER-darker if a root canal has been performed
dentin is composed of - ANSWER-70% inorganic calcium hydroxyapatite crystals
20% organic collagen fibers with small amounts of other proteins
10% water by weight
response = - ANSWER-when the original odonoblasts function in deposition, can also
be called reactionary dentin
predentin is - ANSWER-a band of newly formed, unmineralized matrix of dentin at the
pulpal border of dentin
Dentin forms in 2 stages - ANSWER-first the organic matrix of collagen is deposited
second an inorganic mineral substance is added
during primary dentin formation, - ANSWER-4 microns of predentin is deposited and
calcified each day
after occlusion and function, this activity - ANSWER-decreases to 1.0 to 1.5 microns per
day
odonoblasts form dentin from the - ANSWER-DEJ to the pulp
odonoblast process begins forming - ANSWER-before either enamel or dentin matrix
begins forming
dentin spindles = - ANSWER-tubules that normally begin at the DEJ but may extend
into the forming enamel matrix
the odonoblastic process forms - ANSWER-an S shaped curve which extends to the
pulp
, as the odonoblastic process elongates it - ANSWER-branches to form secondary
processes that appear at nearly right angles to the main process
the DEJ surface is - ANSWER-5 times the size of the pulp surface
the dentinal tubule size is smaller and further apart - ANSWER-at the DEJ than an the
pulpal surface
canaliculi are - ANSWER-lateral branches from tubules
canaliculi connect to - ANSWER-other tubules or to the intertubal matrix
intratubular or peritubular dentin is the - ANSWER-dentinal matrix that immediately
surrounds the dentinal tubule
peritubular dentin is present in - ANSWER-tubules throughout dentin except near the
pulp
peritubular dentin is a - ANSWER-hypermineralized collar around the dentinal tubule
intratubular or peritubular dentin is missing from dentinal tubules in the - ANSWER-
interglobular region
peritubular dentin may obliterate tubules and create - ANSWER-sclerotic or transparent
dentin
sclerotic or transparent dentin is when - ANSWER-intratubular dentin obliterates
dentinal tubules
sclerotic or transparent dentin increases in amount with - ANSWER-age, believed to be
another mechanism to protect the pulp, like reactionary/response and reparative dentin
in sclerotic or transparent dentin permeability to the pulp is - ANSWER-elminated
sclerotic or transparent dentin is found in areas of - ANSWER-attrition, abrasion,
fracture, and caries
sclerotic dentin is formed due to the - ANSWER-death of the odonoblasts causing
dentinal tubules to close
the main body of dentin is located - ANSWER-between and around the dentinal tubules
intertubular dentin is - ANSWER-the body of dentin which comprises the crown and root
intertubular dentin consists of the same type of organic material matrix fibers as -
ANSWER-intratubular dentin, but less calcified
Accurate Solutions
dentin is a - ANSWER-living, sensitive tissue not normally exposed to the oral
environmentl
dentin is - ANSWER-yellowish in contrast to enamel
dentin appears - ANSWER-darker if a root canal has been performed
dentin is composed of - ANSWER-70% inorganic calcium hydroxyapatite crystals
20% organic collagen fibers with small amounts of other proteins
10% water by weight
response = - ANSWER-when the original odonoblasts function in deposition, can also
be called reactionary dentin
predentin is - ANSWER-a band of newly formed, unmineralized matrix of dentin at the
pulpal border of dentin
Dentin forms in 2 stages - ANSWER-first the organic matrix of collagen is deposited
second an inorganic mineral substance is added
during primary dentin formation, - ANSWER-4 microns of predentin is deposited and
calcified each day
after occlusion and function, this activity - ANSWER-decreases to 1.0 to 1.5 microns per
day
odonoblasts form dentin from the - ANSWER-DEJ to the pulp
odonoblast process begins forming - ANSWER-before either enamel or dentin matrix
begins forming
dentin spindles = - ANSWER-tubules that normally begin at the DEJ but may extend
into the forming enamel matrix
the odonoblastic process forms - ANSWER-an S shaped curve which extends to the
pulp
, as the odonoblastic process elongates it - ANSWER-branches to form secondary
processes that appear at nearly right angles to the main process
the DEJ surface is - ANSWER-5 times the size of the pulp surface
the dentinal tubule size is smaller and further apart - ANSWER-at the DEJ than an the
pulpal surface
canaliculi are - ANSWER-lateral branches from tubules
canaliculi connect to - ANSWER-other tubules or to the intertubal matrix
intratubular or peritubular dentin is the - ANSWER-dentinal matrix that immediately
surrounds the dentinal tubule
peritubular dentin is present in - ANSWER-tubules throughout dentin except near the
pulp
peritubular dentin is a - ANSWER-hypermineralized collar around the dentinal tubule
intratubular or peritubular dentin is missing from dentinal tubules in the - ANSWER-
interglobular region
peritubular dentin may obliterate tubules and create - ANSWER-sclerotic or transparent
dentin
sclerotic or transparent dentin is when - ANSWER-intratubular dentin obliterates
dentinal tubules
sclerotic or transparent dentin increases in amount with - ANSWER-age, believed to be
another mechanism to protect the pulp, like reactionary/response and reparative dentin
in sclerotic or transparent dentin permeability to the pulp is - ANSWER-elminated
sclerotic or transparent dentin is found in areas of - ANSWER-attrition, abrasion,
fracture, and caries
sclerotic dentin is formed due to the - ANSWER-death of the odonoblasts causing
dentinal tubules to close
the main body of dentin is located - ANSWER-between and around the dentinal tubules
intertubular dentin is - ANSWER-the body of dentin which comprises the crown and root
intertubular dentin consists of the same type of organic material matrix fibers as -
ANSWER-intratubular dentin, but less calcified
