histology chapter 13

inner part of the tooth...usually not visible

composition of dentin

induce outer cells of dental papilla to differentiate into odontoblast

begin secreting predentin(dentinogenesis)

T/F: the odontoblasts move away from the DEJ depositing layers of predentin
True False

____covers most of the crown and root

T/F: only some afferent fibers to a tooth are pain fibers
True False

during what stage is the mineral content increased in the dentin

dentin that is more heavily mineralized

dentin that is less mineralized

cellular extensions of the odontoblast

? extend form DEJ or CEJ to the pulp chamber
contain odontoblastic process(makes the tubules)
may contain afferent axon

channels that carry axons(nerve fibers) To the brain

channels that carry axons(nerve fibers) away form the brain
motor nerves

cellular extension of odontoblast

8 types of dentin

highly mineralized and forms the walls sof the dentinal tubules

fills in the space between the tubules and is less mineralized than peritubular dentin

the first layer of dentin to form, it is more tubular than the inner dentin,and more heavily mineralized than inner dentin(circumpupal dentin)

found adjacent to the pulp, forms after mantle dentin most of the dentin in a tooth is this type

formed BEFORE the completion of the apical foramen

formed AFTER the completion of the apical foramen-makes pulp chamber smaller over time

reparative dentin

formed in response to injury and is more irregular than primary or secondary dentin

formed in response to chronic caries-the odontoblastic processes die and the tubles fill in with dentin-it has a dark smooth and shiny appearance

this dentin is rare

tiny hole at the end of the root of a tooth

growth lines of dentin
dark lines or bands
correspond to growth rings

formed when several imbrication lines adjoin
neonatal line is most pronounced
demonstrates disturbances in metabolism

this is found adjacent to the DCJ
only appears granular
only on root surface

T/F: tubules become filled in over time
True False

provides support maintenance and formation of the dentin

this pulp is with in the crown

this pulp is within the root

opening at root tip where nerves and vessels enter

secondary openings into the pulp chamber along the lateral surface of the root

these make RCT very difficult

features of the pulp-componets of connectve tissue(cells)

contains mostly collagen fibers

has extensive vascular supply,
has a rudimentary lymphatic system

most numerous cells of the pulp

2nd most numerous cells of the pulp

masses of dentin within the pulp chamber

2 types of pulp stones

microscopic zones in the pulp

T/F: the pulp becomes less cellular, more fibrotic, smaller and has less capacity to repair itself
True False