MIDTERM ORALHISTO Flashcards
exam
1
Q
tooth development is also known as?
A
odontogenesis
2
Q
formation and development of enamel
A
amelogenesis
3
Q
formation of dentin
A
dentinogenesis
4
Q
epithelial lining of the stomodeum
A
stratified squamous epithelium
5
Q
primary epithelial band divides into?
A
dental lamina
vestibular lamina
6
Q
the vestibular lamina gives rise to?
A
oral vestibules
7
Q
the dental lamina gives rise to?
A
the tooth bud
8
Q
forms the primary dentition
A
primary dental lamina
9
Q
dental lamina of the permanent teeth;
seen lingual to the primary dental lamina
A
successional dental lamina
10
Q
tooth development starts/initiated when?
A
6th week in utero
11
Q
stages in the life cycle of a tooth
A
growth stage
calcification
eruption
attrition
12
Q
physiologic process in tooth growth stage
A
initiation
proliferation
histodifferentiation
morphodifferentiation
apposition
13
Q
morphologic process in tooth growth stage
A
dental lamina
bud stage
early cap stage
advanced cap stage
early bell stage
advanced cap stage
enamel and dentin formation
14
Q
hardening process; addition of calcium and phosphate in enamel and dentin
A
calcification
15
Q
vertical movement of tooth towards the oral cavity in its functional position
A
eruption
16
Q
wearing off of tooth structure by friction of contact
A
attrition
17
Q
wearing off of tooth structure due to mechanical substances/materials
A
abrasion
18
Q
wearing away of tooth structure due to acids
A
erosion
19
Q
germ layers present in cap stage
A
IEE
OEE
stellate reticulum
20
Q
germ layers present in bell stage
A
IEE
OEE
stellate reticulum
stratum intermedium
21
Q
this gives rise to the enamel
A
enamel organ
22
Q
this gives rise to the dentin and pulp
A
dental papilla
23
Q
this gives rise to the periodontium
A
dental follicle/sac
24
Q
signifies the presence of an invagination of the dental organ
A
cap stage
25
Transient structures that may be present during late cap stage until advanced bell stage
enamel cord
enamel knot
enamel septum
enamel navel
26
toothgerm, which is a developing tooth and surrounding structures originates from?
ectoderm
mesoderm
27
what are the tooth germs
dental organ (enamel)
dental papilla (dentin & pulp)
dental follicle/sac (cementum, periodontal ligament, alveolar bone)
28
formative cells of enamel
ameloblasts
29
ameloblasts cell structure
tall columnar cells
30
formative cells of dentin
odontoblasts
31
cell structure of odontoblasts
cuboidal but later becomes columnar
32
the basement membrane separating dental papilla from IEE
membrana preformativa
(future DEJ)
33
dental sac is
mesodermal tissue + dental papilla
(expound)
during bell stage, the mesodermal tissue around the dental organ and the base of the dental papilla differentiates into fibrous connective tissue capsule forming the dental sac (or aka dental follicle)
34
a stage in tooth growth where:
IEE cells → ameloblast
and
dental papilla → odontoblast
histodifferentiation
35
a stage in tooth growth where the form and shape of the crown is to be developed
morphodifferentiation
36
the form and the shape of the crown to be developed is determined by?
membrana preformativa
37
a stage in tooth growth where there is deposition of enamel, dentin, and cementum
apposition
38
an epithelial structure that arise from the junction of the IEE and OEE along the margins of the dental organ
Hertwig's epithelial root sheath
(HERS)
39
the hard translucent tissue covering the anatomical crowns of teeth
enamel
40
structural elements of enamel
enamel prisms (enamel rods)
interprismatic substance (interrod cementing substance)
prism sheath (rod sheath)
41
brownish lines that mark the growth periods of enamel
band of retzius
42
the transverse wave-like grooves thought to be the external manifestations of retzius
perikymata
43
leaf-like structural defects extending from the surface of the enamel towards the interior
enamel lamellae
44
narrow, ribbon-like structures composed of bundles of poorly calcified rods
enamel tufts
45
club-shaped extensions or projections of the dentinal tubules into the enamel
enamel spindles
46
alternating light and dark bands originating from dentinoenamel junction towards the surface
hunter-schreger's bands
47
lines crossing the rods 4 microns interval, which becomes more visible when in contact with acid
transverse striations
48
2 phases of amelogenesis
1. formative phase
2. mineralization and maturation phase
**explain**
49
a thin membrane on the surface of the enamel;
protective covering of the enamel
Nasmyth membrane
50
fate of the enamel organ:
what is the result when the 4 layers of cells of the dental organ fuse into one layer
reduced enamel epithelium
(REE)
51
what is formed when REE unites with unites with the epithelium of the oral mucosa
epithelial attachment
52
what is the life cycle of ameloblasts
1. morphogenic stage
2. organizing stage
3. formative stage
4. maturative stage
5. protective stage
6. desmolytic stage
**explain**
53
a condition where there is disturbance in the formation and maturation of the enamel matrix
amelogenesis imperfecta
54
embryonic tissue of enamel
ectoderm
55
formative tissue of enamel
enamel organ
56
formative cell of enamel
ameloblast
57
area of fusion between the inner dental epithelium and outer dental epithelium
cervical loop
58
basic structural units of the enamel
enamel prism/ enamel rods
59
Accentuated band of Retzius seen in the partial development of deciduous teeth
neonatal line/ring
60
forms the main bulk of the tooth
dentin
61
formative tissue of dentin
dental papilla
62
formative cell of dentin
odontoblast
63
embryonic tissue of dentin
mesenchymal tissue
64
basic structural unit of dentin
dentinal tubules
65
parts of the dentinal matrix
peritubular dentin
intertubular dentin
66
the part of the dentinal matrix that forms the immediate wall of the dentinal tubules;
highly mineralized
peritubular dentin
67
the part of the dentinal matrix found between the dentinal tubules;
main bulk of the dentin
intertubular dentin
68
these are regularly arranged canals that surround the odontoblastic process;
they radiate from the pulp cavity to the DEJ and DCJ
dentinal tubules
69
contents of the dentinal tubules
odontoblastic process
dentinal fluid
nerve fibers
70
the cytoplasmic extensions of odontoblasts found inside the dentinal tubules
odontoblastic process
71
the fluid present between the odontoblastic process and the wall of the dentinal tubule
dentinal fluid
72
# theory on pain mechanism of dentin
stimuli in some manner reach the nerve endings in the inner dentin;
stimulus can be pressure or temp
direct neural transmission theory
73
# theory on pain mechanism of dentin
odontoblast cell is the primary structure *excited by the stimulus and the impulse* is transmitted to the nerve endings in the inner dentin
transduction theory
74
# theory on pain mechanism of dentin
various stimuli affect fluid movement in the dentinal tubules;
movement stimulates pain mechanism in the tubules by mechanical disturbance of nerves associated with odontoblasts
hydrodynamic theory
75
structural characteristics of dentin
interglobular dentin
granular layer of Tome's
contour lines of Owen
Von Ebner lines
neonatal lines
76
# structural characteristic of dentin
hypomineralization between the globules;
imperfectly calcified
interglobular dentin
77
# structural characteristic of dentin
imperfectly calcified dentinal matrix found at or near the DCJ only
granular layer of Tome's
78
# structural characteristic of dentin
lines that mark the difference in the degree of matrix calcification resulting in banding of the dentin
contour lines of owen
79
# structural characteristic of dentin
incremental lines or imbrication linesdefines each layer of dentin deposited
Von Ebner lines
80
# structural characteristic of dentin
formed by the abrupt change in environment that occurs at birth;
maybe a zone of hypocalcification
neonatal line
81
dentin formed during it development;
formed before eruption
primary dentin
82
uncalcified dentin;
layer of dentin found right after the odontoblast cell
predentin
83
first calcified dentin
mantle dentin
84
main bulk of the primary dentin
circumpulpal dentin
85
dentin formed after eruption of tooth
secondary dentin
86
dentin formed as a response to injury
tertiary dentin
87
dentin that appears to be like bone
osteodentin
88
layer by layer calcification of predentin
linear calcification
89
globules of calcospherites are formed that enlarge and fuse to form a perfectly calcified dentin
globular calcification
90
synthesized by odontoblasts in pre-existing ground substance of dental papilla
fibers
91
process of forming fibers
fibrilogenesis
92
pre-existing substance of the dental papilla
ground substance
93
2 phases of dentinogenesis
1. formation (formative stage)
2. mineralization (calcification)
