OralHisto Midterms Exam Flashcards
1
Q
what is the process of enamel formation called
A
amelogenesis
2
Q
protein in not fully matured enamel
A
amelogenin
3
Q
represents the short dentinal tubules near the DEJ
A
enamel spindle
4
Q
when does amelogenesis occur
A
apposition
5
Q
cap stage week
A
9-10
6
Q
radiograph of enamel
A
radiopaque
7
Q
chemical properties of dentin
A
65%-75% inorganic
30%-35% organic
8
Q
formative tissue of dentin
A
dental papilla
9
Q
future DEJ
A
basement membrane
10
Q
produces periodontium
A
dental sac
11
Q
stage where ameloblasts form the primary enamel cuticle as the first protective covering of the enamel;
formation of the ree
A
protective
12
Q
wavelike features
A
perikymata
13
Q
what is the crystalline structural unit of enamel
A
enamel rod/prism
14
Q
produces the future dentin and pulp
A
dental papilla
15
Q
oral epithelium produces ?
A
- dental lamina
- vestibular lamina
16
Q
what has the longest developmental period for any set of organs in the body
A
teeth
17
Q
final stage of odontogenesis
A
apposition
18
Q
labial and buccal to the dental lamina ; develop independently
A
vestibular lamina
19
Q
there are four layers of the enamel organ that fuse to form?
A
Reduced Enamel Epithelium
(REE)
20
Q
protein in matured enamel
A
enamelin
21
Q
differentiates into odontoblast
(dentin-secreting cells)
A
outer peripheral cells
22
Q
small dark brushes with their bases near the DEJ
A
enamel tufts
23
Q
dentin that is formed after the completion of the apical foramen and continues to form throughout the life of the tooth
A
secondary dentin
24
Q
controlled cellular growth & accumulation of by-products
A
proliferation
25
formative cell of dentin
odontoblast cell
26
forms the bulk of the tooth
dentin
27
a PRONOUNCED incremental line of retzius
neonatal line
28
fibers that insert in the outer layers of the cementum and surrounding alveolar bone
Sharpeys fibers
29
an optical phenomenon produced by changes in direction between adjacent groups of rods ;
Dark & Light alternating zones
Hunter Shreger Bands
30
basic structural unit of dentin
dentinal tubules
31
marks stress / trauma experienced by the ameloblast during birth
neonatal line
32
interaction between embryological cells
induction
33
consists of incorporation of the fibrillar matrix
ground substance
34
apatite crystals
crystallization
35
sensation fibers
beta fibers
36
main composition of enamel
calcium hyrdroxyapatite
37
dentin that is formed in a tooth before the completion of the apical foramen of the root, which is the opening in the root's pulp canal
primary dentin
38
aka lip furrow band
vestibular lamina
39
a depression results in the deepest part of each tooth bud forming the cap called?
enamel organ
40
permanent teeth count
32
41
partially mineralized vertical sheets of enamel matrix that extend from the DEJ to the outer occlusal surface
enamel lamellae
42
initially consist of 2 horseshoe - shaped bands of tissue at the surface of the stomodeum
oral epithelium
43
overlapping of primary and permanent teeth
mixed dentition
44
protoplasmic projections of ameloblast into the matrix
Tome's process
45
appears as an extension of the dental lamina into the ectomesenchyme lingual to the developing primary tooth germs
successional dental lamina
46
less elastic; coarse fibers
collagen fibers
47
acellular structures that separate the oral epithelium and ectomesenchyme
basement membrane
48
formation of fibers
fibrilogenesis
49
interaction of ameloblasts with adjacent mesenchymal cells determining the shape of the DEJ and crown
morphogenic
50
the remaining ectomesenchyme surrounding the outside of the enamel organ
dental sac
51
reparative dentin or reactive dentin
tertiary dentin
52
determines the shape and number of roots
HERS
53
dentin found in between the tubules
intertubular dentin
54
2 phases of amelogenesis
formative
mineralization & maturation
55
enamel cuticle aka
Nasmyth's membrane
56
most apical segment of the HERS
epithelial diaphragm
57
what are the four layers that fuses
Outer Enamel Epithelium
Inner Enamel Epithelium
Stellate Reticulum
Stratum Intermedium
58
produces enamel
enamel organ
59
Korff's fibers aka
alpha fibers
60
dental sac is derived from?
ectomesenchyme
(mesenchymal in origin)
61
determines the shape of the crown
dentin
62
4 distinct cells in bell stage
IEE'
OEE
SR
SI
63
dentin that is formed quickly in local regions in response to a localized injury to the exposed dentin
tertiary dentin
64
dentin where the process of response dentin is started by the pulp
reparative dentin
65
the hardest mineralized tissue in human body
enamel
66
ameloblasts interact with cells of dental papilla at the periphery which later differentiate into odontoblasts
organizing
67
dentin that creates the wall of the dentinal tubule
peritubular dentin
68
produces enamel matrix
ameloblast
69
becomes the primordium of the pulp
inner central cells
70
when odontoblast synthesize/produce dentinal matrix at the apical end of the cell and along its process
predentin
71
partial mineralization of the segments of matrix
primary calcification
72
gradual completions of the mineralization ; rest of the mineral contents are deposited from the height of the crown to the cervical
secondary calcification
73
periodontium
cementum
periodontal ligaments
alveolar bone
74
first predentin that forms and matures within the tooth near the DEJ and underneath the enamel
mantle dentin
75
formative phase main component
Tome's process
76
outer part of the ectoderm gives rise to?
the oral epithelium
(primary epithelial band)
77
stage where ameloblasts play a role in maturation of the formed matrix
maturative
78
bell stage week
11-12
79
unequal growth in different parts of the tooth bud
cap stage
80
the extension of an odontoblast
odontoblastic process
81
enamel percentage composition
96% inorganic
1% organic
3% water
82
stage where there is destruction of the connective tissue along the pathway of eruption
desmolytic
83
makes up the bulk of the dentin in a tooth. this type forms and matures after mantle dentin
circumpulpal dentin
84
bud stage week
8th
85
enamel organ is derived from?
ectoderm
86
epithelial diaphragm forms?
apical foramen
87
a delicate membrane that covers entire portion of newly erupted crown
enamel cuticle
88
attainment of adult form and size due to proliferation, differentiation, and morphogenesis
maturation
89
change in identical embryonic cells to become distinct structurally and functionally
differentiation
90
series of lines extending from the DEJ towards the tooth surface
striae of retzius
91
development of specific tissue morphology or differing from due to embryonic cell migration and inductive interactions
morphogenesis
92
what is the life cycle of ameloblasts
1. morphogenic
2. organizing
3. formative
4. maturative
5. protective
6. desmolytic
93
a part of the ectomesenchyme deep to the buds has condensed into a mass within the concavity of the cap of the enamel organ
dental papilla
94
stage where ameloblasts form the enamel matrix
formative
95
fiber from the connective tissue cells especially fibroblasts of dental papilla
Korff's fibers
96
structure responsible for root development
cervical loop
97
dentin formation must always occur before enamel formation
true
98
over the cusp of teeth rods appear twisted around each other in a seemingly complex arrangement
gnarled enamel
99
named for an extensive proliferation of oval masses that penetrate into the ectomesenchyme
bud stage
100
what tissue in the body has no nerve supply and is avascular
enamel
101
histologic landmarks identified on an ameloblast, cells involved in the production of tooth enamel
Tome's process
102
incremental growth lines seen in enamel and are the result of enamel development
striae of retzius
