Cementum

Question 1

three descriptions of the CEJ and their percentage of occurance

Answer 1

1. Overlap -60% - consists of the acellular afribrilar cementum
2. Butt Joint - 30%
3. Gap -10%

Question 2

mean thickness of cementum pattern

Answer 2

thickest at the apex - increases as go towards apex
50 um at the CEJ
120-160 at mid-root level
200-250 at apex level

Question 3

two main forms of cementum

Answer 3

acellular, collagen -fiber-containing type - static/attachment of tooth to bone - not bone like

cellular, collagen fiber-containing - dynamic/adaptation - more bone like

Question 4

composition of cementum

Answer 4

60% inorganic of HAP - Ca10(PO4)6(OH)2

40% organic - which is 80-90% collagen fiber composition

Question 5

mantle dentin of crown

Answer 5

requires the reduced enamel epithelium to form

Question 6

mantle dentin of root

Answer 6

requires the hertwig’s epithelial root sheath