Ob Lecture 11 Root

Front 1

What forms the ERS?

Back 1

when IEE and OEE come together

Front 2

briefly say 3 things ERS does...ie how does it develop the root?

Back 2

1) ERS forms outline of root

2) induces odontoblasts of papilla to produce dentin of root

3) secretes enamel like proteins (intermediate cement)

Front 3

3 things that outer FOLLICLE FORMS (think to the left of the tooth)

Back 3

1) cementoblasts form cement

2) fibroblasts secrete collagen bundles that form the PL

3) osteoblasts form the alveolar bone

Front 4

where does formation shift as the root forms downwards?

Back 4

it shifts from the ERS to the follicle (i.e. root develops, then the cement, then the PL beside it, then the bone)

Front 5

what side is the hyaline layer on? what does it contain? what does it not contain?

Back 5

on odontoblast side... contains collagen/organic layer,

NO ODONTOBLAST PROCESS!

Front 6

briefly outline how collagen is laid down? i.e. orientation from fibroblasts, first layer layer down, etc

Back 6

first collagen laid down by odontoblasts, then cementoblasts lay down intrinsic parallel fibbers, then collagen fibers lay down extrinsic perpendicular fibbers (FIBROUS FRINGE)

FINALLY FIBROBLASTS start laying down collagen with no particular orientation.

Front 7

what kind of union is there b/w cement and dentin, why?

VERY VERY VERY FIRST LAYER OF CEMENT LAYED DOWN CALLED?

Back 7

seamless union, ATTEMPT TO PROTECT ROOT!

PRIMARY ACELLULAR INTRINSIC CEMENT (THE EXCEPTION)

Front 8

UNMINERALIZED AREA OF DENTIN?

Back 8

HYALINE LAYER

Front 9

second layer after acelluar intrinsic layer of cement?

Back 9

acellular extrinsic cement...all perp to root (stretches the whole length from cement to alveolar bone)

Front 10

how does orientation of the fibbrs change?

what adv does it give?

Back 10

from a unidirectional orientation to a multidirectional orientation --> gives strength in all directions

Front 11

what specific cell does cellular cement have and where is cellular cement?

Back 11

has cementoCYTES, at apical part

Front 12

what happens to the enamel organ during all of this?

Back 12

it collapses to form the reduced enamel epithelium

Front 13

what happens above the reduced enamel epithelium?

does it fuse with anything?

Back 13

modified OEE cells dissolve away bone and tissue (i.e. collagen) along the eruption pathway.

the reduced enamel epithelium fuses with the oral epithelium?

Front 14

when does the tooth erupt?

what happens to the gingiva?

Back 14

when the reduced enamel epithelium fuses with the oral epithelium

the gingiva adheres with the CERVICAL part of the tooth AFTER ERUPTION

Front 15

when are all the ameloblasts dead?

Back 15

eruption marks the end of most ameloblasts

Front 16

complications with new teeth?

Back 16

a primary tooth must be pulled without damaging the secondary tooth

Front 17

canal forming above a developing tooth is called?

what does it do/have

Back 17

gubernacular canal...thought to have collagen fibers puling it up

Front 18

what happens to the old root of teeth being replaced

Back 18

osteclasts take bite out of it called Howship's lacunae

Front 19

at what stage are both teeth present and changing called?

Back 19

mixed dentition stage

Front 20

which parts of teeth are causing forces by formation?

forces due to remodelling?

Back 20

formation= GPR- growth of pulp (pressure) and root

remodelling- PL and alveolar bone

Front 21

what is required for a tooth to erupt? most recent model...

FB- facebook

what can't u remove? what could u remove and still get eruption?

Back 21

NEED FOLLICLE AND BONE DEVELOPMENT/remodelling

remove follicle from dog- no eruption

metal tooth in dog but leave follicle- GET ERUPTION

Front 22

HOW DO YOU GET MULTIPLE ROOTS?

how many roots?

Back 22

the ERS furcates/branches. number of roots matches number of cusps?

Front 23

to clarify, what happens above reduced enamel epithelium during eruption?

Back 23

1) modifiedOEE dissolve collagen and fibroblasts

2) osteclasts break down root of tooth above and ameloblast remnants...howship's lacuane

3) oral epithelium and reduced Enamel ep. fuse