Histo Chapter 14: Periodotium: Cementum, Alveolar Bone Pdl

Front 1

What is included in the periodontium.

Back 1

cementum
alveolar bone
periodontal Ligaments

Front 2

What part of the periodontium attaches to the teeth and the alveolar bone by anchoring the periodontal ligament

Back 2

cementum

Front 3

The cementum overlies what part of the dentin in the root?

Back 3

Tome's granular layer

Front 4

The cementum is thickest at what area of the tooth

Back 4

tooth's apex and in the interradicular areas of multirooted teeth ( 50-200 micrometers)

Front 5

The cementum in the thinnest at what part of the tooth?

Back 5

at the CEJ at the cervix of the tooth (10-50 micrometers)

Front 6

Where does the cementum receives it's nutrition from?

Back 6

Surrounding Periodontal ligaments

Front 7

T/F
The cementum has no innvervations and is avascular?

Back 7

True

Front 8

What is the composition of Cementum?

Back 8

65% inorganic or Mineralized
23% organic material
12 % water

Front 9

What houses the tooth root?

Back 9

Alveolar Bone

Front 10

PDL attaches the cementum to the?

Back 10

Alveolar Bone

Front 11

The mineralized component of cementum is predominately?

Back 11

Calcium Hydroxyapatite

Front 12

Cementum appears more ____(darker) than enamel or dentin?

Back 12

Radiolucent

Front 13

Cementum is more ____ (lighter) than pulp

Back 13

radiopaque

Front 14

Cementum forms from what structure?

Back 14

Dental Sac

***Cementum forms on the root after the disintegration of Hertwig's epithelial root sheath ( H.E.R.S)***

Front 15

T/F
In the Cementum there is presence of nervous and vascular tissue?

Back 15

False

it may have Cementocytes but does NOT have nervous or vascular tissue present

Front 16

H.E.R.S. disintegrates and forms the?

Back 16

rests of Malassez

Front 17

In the development of Cementum, cells from the the undifferentiated dental sac differentiate into?

Back 17

Cementoblast

Front 18

What is the function of Cementum?

Back 18

1. Primary fnx: to attach the rest of the periodontium with the tooth
2. Protect the underlying dentin. It can mend the area of root fracture
3. Compensates by apposition of material to the apex with attrition reduces tooth structure

Front 19

what is the process when cementoblast covers the forming root dentin

Back 19

cementogenesis

Front 20

during cementogenesis what is being layed down

Back 20

cementoids

Front 21

Cementoblast that are surrounded by cementum become what?

Back 21

cementocytes

Front 22

calcification of cementoids yields what?

Back 22

cementum

Front 23

primary cementum is also know as?

Back 23

Acellular cementum

* it is the first deposited along the complete root surface

Front 24

secondary cementum is also known as

Back 24

Cellular cementum

*located on the apical third of the root over the acellular cementum*

Front 25

T/F
Cellular cementum can be deposited or resorbed throughout the life of the tooth

Back 25

TRUE

Front 26

Composition of Alveolar Bone

Back 26

60% mineralized inorganic material
25% organic material
15% water

Front 27

What remodels easily and makes orthodontic movement of teeth possible

Back 27

Alveolar Bone

Front 28

What are two clinicial considerations with Alveolar bone

Back 28

1. Orthodontic teeth movement
2. Mesial Drift

Front 29

What are two primary divisions of the Jaw bone:

Back 29

1. Alveolar bone--contains the tooth roots
2. Basal bone--apical to the alveolar process

Front 30

Alveolar bone proper is compose of ?

Back 30

compact bone--sometimes called cribiform plate

** allows Volkman's canals to pass into the PDL

Front 31

Sharpey's fibers insert into alveolar bone and cementum at a _____ angle

Back 31

90 degree

Front 32

The lamina propria of the attached gingiva serves as a

Back 32

Mucoperiosteum for the alveolar bone proper

Front 33

the supporting alveolar bone consist of:

Back 33

of a mix and cortical trabecular bone

Front 34

The cortical bone lines what surfaces of the alveolus

Back 34

the facial and lingual surfaces and consist of plates of compact bone.

Front 35

Periodontal ligaments appear as ____ on the radiograph

Back 35

radiolucent gab between the root and lamina propria

Front 36

The functions of Periodontal ligaments are:

Back 36

1."shock absorber"
2.provides nurishment and removes waste from the cementum and alveolar bone

Front 37

The nerve supply of PDLs permits accurate judgement of the ?

Back 37

pressure of mastication on the teeth

Front 38

Components of the PDL include:

Back 38

Fibroblasts
Cementoblasts
Osteocytes, osteoclasts, odontoblasts, odontoclasts
Mesenchymal cells,
Epithelial rests of Malassez

Front 39

what are the 5 main alveolodental group of fibers?

Back 39

Alveolar crest
Horizontal
Oblique
Apical
Interradicular