EX2; Periodontium - Cementum Flashcards Preview

May14 Oral Histology > EX2; Periodontium - Cementum > Flashcards

Flashcards in EX2; Periodontium - Cementum Deck (26):
1

What are the three main functions of cementum

attachement
protection
adaptation (to the physiological forces of mastication

2

What is the composition of cementum

45-50% organic
50-55% inorganic (but can vary)

3

What makes up the organic component of cementum

90% collagen (90:10 type I to type III)
non-collagenous proteins
ground substance

4

True or False
Cementum is not vascularized

True

5

True or False
Cementum does remodel

False; it does not remodel

6

What is the main difference between cementum and bone

cementum is secreted throughout life, but not normally resorbed

7

Where is cementum the thinest/thickest

thinest = ~CEJ (vulnerable)
thickets = towards the root apex

8

What are the different types of CEJ joints

overlap (60%)
butt against (30%)
gap (10%)

9

Primary cementum is composed of what

acellular extrinsic fiber (AEFC)

10

What does extrinsic refer to in talking about AEFC

the fact that the organic matrix of cementum is secreted by cementoblasts and PDL fibroblasts that do NOT become entrapped in the cementum

11

Acellular extrinsic fiber cementum is considered to play the most important role in what

attachment

12

These constitute the mineralized ends of the PDL fibers

Sharpey's fibers

13

This consists of collagen fibers oriented parallel to the surface of the cementum with no clear connection to the PDL

cellular intrinsic fiber cementum (CIFC); type of secondary cementum

14

This comprises the bulk of secondary cementum

mixed fiber cementum

15

What type of fibers does mixed fiber cementum contain

intrinsic (parallel)
extrinsic (perpendicular)
perpendicular plays the roll in attachment

16

When is mixed fiber cementum secreted

after and more slowly than the initial wave of secondary cementum, more prominent apically

17

Where is the secondary cementum most thick

in places in response to occlusal forces

18

These were originally cementoblasts, entrapped in the mineralizing extracellular matrix

cementocytes

19

True or False
Cementocytes are actively participating in synthesizing cementum

False; they are not

20

The rate of cementum formation varies based upon what

environmental factors

21

An increase in cementum production has been associated with what

attrition
periodontal disease accompanied by pronounced inflammation

22

Continued deposition of cementum can cause the size of what to become progressively smaller

the apical foramen

23

Where are the cementoblasts located

lying at the end of the PDL, their long axis parallel to the CEJ

24

The outmost layer of cementum directly adjacent to the cementoblasts is sometimes unmineralized, and called what

cementoid

25

These are similarly found in dentin and enamel, apparent in layers in the cementum

growth lines

26

This is excessively large amounts of cementum deposition (around the root)

hypercementosis (relatively rare)
in the case study; the patient presented with gingival recession but no pain