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Flashcards in 510-9 Deck (31):
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2 functions of teeth

digestion, communication

1

crown

anatomically- covered with enamel
clinically- exposed

2

PDL

connects cementum to alveolar bone

3

enamel

96% mineral
hardest tissue in the body
translucent
non living in adults
slightly porous

4

dentin

70% mineral
2nd hardest tissue in the body
alive in adult

5

pulp

vascular and innervated

6

cementum

living, bone-like material
45-60% mineral

7

apatites

calcium phosphate crystals that make up enamel
combine with Cl, Fl, OH
HYDROXYAPATITE most common

8

Floridation

when Fl is incorporated in apatite

9

fluorosis

when too much Fl is incorporated into apatite crystal and the enamel has a mottled appearance

10

enamel rods

hydroxyapatite crystals in enamel arranged by amelogenins

11

amyloblasts

produce enamel

12

enamel etching

enamel etched with acid to allow bonding agent to stick to the tooth (type I, type II, type III)

13

meth mouth

loss of enamel

14

dentinoenamel junction

where dentin meets enamel (not smooth but scalloped to withstand shearing)

15

3 types of microscopic enamel imperfections

1.) lamellae- spans whole enamel (organic material)
2.) tufts- spans a short section of enamel (enamel proteins)
3.) spindles- odontoblast processes stuck in enamel

16

odontoblasts

secrete cells of the dentin remain attached to the DEJ by processes

17

peritubular dentin

mineralized dentin immediately surrounding the odontoblast process

18

intertubular dentin

dentin in between tubulues

19

predentin

unmineralized dentin (newly deposited)

20

primary dentin

makes up most of the dentin (mineralized predentin)

21

secondary dentin

deposited once roots form and slowly shrink the pulp cavity

22

tertiary dentin

used locally for repairs
REACTIONARY- produced by existing odontoblasts
REPARATIVE- produced by newly differentiated odontoblasts

23

mantle dentin

dentil deposited under the enamel

24

dead dentinal tracts

dead odontoblastic processes that can't be repaired

25

Nerve Plexus of Raschkow

nerves that loop from the pulp into the predentin

26

3 proposed mechanisms of dentin sensitivity

1.) direct innervation of dentin
2.) odontoblasts act as receptors
3.) tubular nature of dentin allows for fluid movement

27

cementum

living, bone like structure between the root and the PDL
45-60% mineral

28

cementoblasts

produce cementum and become encased in cementum and become CEMENTOCYSTS

29

2 main types of cementum

1.) acellular- no cells present cuz located by PDL, functions in anchoring, found in cervical region of tooth
2.) cellular- mobility, cells dispersed throughout, located low on roots

30

4 zones of the pulp

1.) odontoblast
2.) cell free
3.) cell rich
4.) pulp core