Oral Histo And Embryo

Front 1

von Korff's fibers

Back 1

characteristic of mantle dentin, fan-shaped, thich coarse bundles of collagen fibers in between odontoblasts

Front 2

circumpulpal dentin

Back 2

smaller fibrils of collagen, typical of the bulk of dentin, present in mantle dentin

Front 3

terminal branches of odontoblasts

Back 3

numerous, small, located near the DEJ

Front 4

collateral branches of odontoblasts

Back 4

larger and leave the odontoblstic process at a right angle almost anywhere along its length

Front 5

interglobular dentin

Back 5

hypocalcified region

Front 6

globular dentin

Back 6

normally calcified region

Front 7

aprismatic enamel matrix

Back 7

first enamel layer

Front 8

tome's process

Back 8

as ameloblsts retreat, short blunt process, and when the cell retreats, it retreats its process as well, leaving a depression in the enamel matrix, rod space

Front 9

reduced enamel epi

Back 9

postameloblasts, stratum intermedium, outer enamel epi form a cellular sheath

Front 10

primary enamel cuticle

Back 10

acellular noncalcified produced by postameloblasts

Front 11

reduced enamel epi

Back 11

protects the newly formed enamel but participates in the formation of early dentogingival jxn

Front 12

as hertwig's epithelial root sheath elongates,

Back 12

its apical rim is folded in a medial direction. this folded rim = epithelial diaphragm

Front 13

epi diaphragm

Back 13

stabilized at the region where it develops so that it cannot move in a coronal or in an apical direction

Front 14

as root is being formed,

Back 14

the entire developing tooth is moving surfaceward toward the oral cavity

Front 15

hyaline layer of Hopewell-Smith

Back 15

internal layer of Hertwig's epithelial root sheath elaborates a thin, enameloid-like substance on the surface of the newly formed dentin believed to facilitate the adherence of cementum to dentin

Front 16

rest cells of Malassez

Back 16

partial degeneration pieces of hertwig's epi root sheath

Front 17

cementoblasts

Back 17

ectomesenchymal cells from dental sac (follicle) pass through rests of Malassez differentiate into cementoblasts, manufacture cementum matrix

Front 18

enamel pearls

Back 18

in regions where ectomesenchymal cells do not penetrate between the inner layer of hertwig's epi root sheath and the radicular dentin, enamel pearls may develop. these are produced by cells of the epi root sheath which in unknown manner differentiate into functioning ameloblasts

Front 19

primary dentin

Back 19

dentin formed prior to the completion of root formation

Front 20

secondary dentin

Back 20

similar to circumpulpal dentin, dentin that is formed subsequent to root completion, but not in response to trauma, slower rate than primary dentin and also unequal fashion, more on roof and floor of the pulp chamber

Front 21

tertiary dentin (reparative)

Back 21

the more intense the trauma, the more irregular the tertiary dentin

Front 22

dead tracts

Back 22

if noxious stimulus severe, odontoblasts will die, hollow dentinal tubules, microbial agents access route to pulp, the pulp reacts quickly to such dead tracts by rapidly forming tertiary dentin

Front 23

sclerotic dentin

Back 23

more in radicular (apical half of the root) dentin, hypercalcified and transparent dentin, occurs subsequent to trauma

Front 24

contour lines of Owen

Back 24

metabolic disturbances during dev, additional regions of hypocalcifications in dentin, wide arcs of ring perpendicular to the dentinal tubules

Front 25

daily imbrication lines of von Ebner

Back 25

fine lines indicative of daily deposition of dentin, perpendicular to dentinal tubules

Front 26

neonatal line

Back 26

highly accentuated contour line of Owen where dentin was being formed just at the time of birth, representing metabolic shock as a result of birth

Front 27

granular layer of Tomes

Back 27

in radicular dentin near CDJ, result of tortuous curvatures of the terminal portions of the dentinal tubules

Front 28

dentin most sensitive at

Back 28

DEJ and pulp

Front 29

morphology of enamel rods

Back 29

wide head and narrow tail, one ameloblast make head, three make tail

Front 30

striae of Retzius

Back 30

developmental disturbances in enamel, analogous to the lines of Owen in dentin, numerous rod segments

Front 31

neonatal line

Back 31

exaggerated striae of Retzius, display fewer enamel crystals

Front 32

perikymata

Back 32

at the tooth surface, where striae of Retzius overlap one another as shingles on a roof, they form shallow parallel grooves that encircle the tooth

Front 33

DEJ is

Back 33

scalloped so that convexity of the enamel fits the concavity of the dentin

Front 34

enamel spindle

Back 34

terminal ends of the odontoblastic processes that were trapped in enamel during tooth development

Front 35

enamel tufts

Back 35

at DEJ, look like tufts of grass, hypomineralized groups of enamel rods, ameloblasts fail to resorb much of the enamel matrix

Front 36

enamel lamellae

Back 36

hypomineralized regions of enamel that extend from DEJ to the enamel surface, thin leaf-shaped regions

Front 37

intramembranous bone formation

Back 37

relies on a preexisting sheet of loosely arranged collagenous membrane

Front 38

immature or woven bone

Back 38

newly formed bone whose collagen fibers are irregularly arranged

Front 39

endochondral bone formation

Back 39

relies on the presence of cartilage model

Front 40

periosteal bud

Back 40

consists of blood vessels, osteoprogenitor cells, stem cells, and mesenchymal cells

Front 41

primary center of ossification

Back 41

in endochondral bone formation, diaphysis

Front 42

sharpey's fibers

Back 42

anchor periosteum to bone

Front 43

alveolar bone proper

Back 43

the part of the alveolus which immediately surrounds the root of the tooth that is into which fibers of the periodontal ligament are embedded, is compact bone, aka cribriform plate, lamina dura, bundle bone

Front 44

supporting alveolar bone

Back 44

remainder of the alveolar bone which supports the alveolar bone proper

Front 45

alveolar bone proper synonyms

Back 45

cribriform plate, lamina dura, bundle bone

Front 46

cortical plates of mandible are

Back 46

thicker than that of maxilla

Front 47

cementum considered part of

Back 47

periodontium

Front 48

cementum is

Back 48

avascular and does not possess a nerve supply

Front 49

resting lines

Back 49

parallel lines of cementum, successive layers of cementum

Front 50

acellular cementum

Back 50

primary cementum, coronal 1/2 of root

Front 51

cellular cementum

Back 51

secondary cementum, house cementoblasts, apical region

Front 52

cementicles

Back 52

result from calcifications around the rest cells of Malassez, hypercementosis

Front 53

mesenchyme

Back 53

neural crest

Front 54

masticatory mucosa

Back 54

hard palate, gingivae, dorsum of tongue

Front 55

subepithelial connective tissue subdivided into

Back 55

lamina propria and submucosa

Front 56

submucosa

Back 56

deeper, denser layer

Front 57

lamina propria

Back 57

looser, superficial layer

Front 58

stratum basale (stratum germinativum),

Back 58

deepest cell layer of the epidermis of thick skin, in direct contact with the basal lamina, mitiotic divisions,numerous hemidesmosomes, gap jxns, desmosomes

Front 59

stratum spinosum

Back 59

above stratum basale, numerous short blunt processes (intercellular bridges)= prickle cells, numerous desmosomes, may produce membrane coating granules (lamelated granules, odland bodies) which are released into extracellular spaces and coat the external surfaces of the cell membs to decrease permeability of the epithelium

Front 60

merckel cells

Back 60

aka clear cells in stratum basale, tactile receptors, mechanoreceptors which react to pressure

Front 61

alveolar mucosa

Back 61

overlies the cortical plate of the alveolar process, non-kera, vascular even though paillary layer almost absent

Front 62

collagen fibers of the gingiva undergo a turnover that is much more rapid than elsewhere in the body except

Back 62

PDL

Front 63

sulcular epi

Back 63

epi that lines the free gingiva in the sulcus, non-kera, no epi ridges

Front 64

jxnal epi

Back 64

located on enamel surface only, non-kera, epi ridges absent, hemidesmosomes attach jxn epi to tooth surface

Front 65

koplik's spots

Back 65

measeles, yellow spots on a red surface on the buccal mucosa in the vicinity of max molars

Front 66

mumps

Back 66

common viral lesion of the parotid gland

Front 67

most frequent location of a sialolith

Back 67

duct of the submandibular gland

Front 68

salt and sweet

Back 68

CN VII supplying the fungiform papillae

Front 69

bitter and sour

Back 69

CN IX innervating the circumvallate and foliate papillae

Front 70

bitter

Back 70

CN X epiglottis and root of the tongue

Front 71

guiding cusps

Back 71

noncentric cusps, shearing cusps

Front 72

supporting cusps

Back 72

centric cusps