Cementum Flashcards
what part if the tooth does cementum cover?
root dentine
what is the structure of cementum and what is it similar too?
bone
- collagen matrix
- lamellar arrangment
what is cementum laid down by?
cementocytes and cementoblasts
what does cementum provide?
attachment for some periodontal fibres
what are the 2 types of cementum?
cellular and acellular
where is the cellular cementum found?
the outer portion of cementum
where is acellular cementum found?
inner cementum
closer to the dentine
describe acellular cementum.
-no cells within
- usually adjacent to dentine
- first formed (primary cementum)
describe cellular cementum.
- contains cementocytes
- present in apical part of root and in furcation regions
-later formed (secondary cementum)
what is a furcation region?
the space in between a root
where is cementum compared to enamel?
3 ways
- can over lap with enamel
- can finish level to the enamel
- can leave a gap which causes pain as its exposed
what are sharpey’s fibres?
matrix of connective tissue consisting of bundles of strong predominantly type I collagen fibres
what do sharpey’s fibres do?
connecting periosteum (outer surface of bone) to bone.
what type of cementum is representative of tooth attachment to bone?
acellular
(sharpey’s fibres present)
where are intrinsic collagen fibres on cellular cementum?
parallel to surface
what type of cementum is extrinsic and intrinsic?
acellular = extrinsic
cellular = intrinsic
where is acellular extrinsic fibre cementum present on tooth?
cervical 2/3 of roots
what type of cementum is equivalent to secondary cellular cementum?
cellular intrinsic fibre cementum
what type of cementum is equivalent to primary cellular cementum?
acellular extrinsic fibre cementum
what is the difference between periodontitis and gingivitis?
gingivitis = gum disease, bleeding gums
periodontitis = gum looses attachment of tooth
