Card Set Information
Chapter fourteen cementum
The hard and soft tissues that support the teeth
What are 3 components of periodontium?
Component of the periodontium that sits on the dentin in the root of the tooth
Component of the periodontium that holds the teeth in the jaw
component of the periodontium that connects the cementum to the bone and is made up of lots of fibers
Where does the cementum come from?
The cementum covers the entire______of the tooth
The________serves as one end of the attachment for the ligaments, the other end is_______________.
true or false. Cementum is avascular and has no innervation.
Where does cementum get its nutrition? Why does it have to get it from there?
from the periodontal ligament
because it is avascular and has no innervation
Cementum is________% mineralized
Enamel is___________% mineralized
Dentin is__________% mineralized
Why can't ameloblasts create enamel in the area where the cementum is?
because the ameloblasts don't have their support structures (stellate reticulum)
In the beginning of the development of cementum______________start laying dentin matrix
Odontoblasts lay what structure?
What induces the cells of the dental sac to differentiate into cementoblasts?
newly formed dentin
newly formed dentin____________the cells of the dental sac to______________into cementoblasts
newly formed dentin induces the cells of the dental sac to differentiate into what?
What are cementoblasts?
cells that lay down cementoid or become cementocytes if they get caught in the matrix
The cementoblasts lay their__________and some of them get caught in the matrix and become___________
The ends of the periodontal ligament that have embedded themselves into the cementum
where the cementum and the enamel meet
What are the 3 types of meetings for the cementoenamel junction?
Why is there overlap in the cementoenamel junction sometimes?
because the enamel was formed first
In what type of cementoenamel junction does the junction feel rough and may be confused with calculus?
What is the ideal meeting type for the cementoenamel junction?
meet perfectly in the middle
Whay type of cementoenamel junction meeting has a space between the cementum and the enamel, leaving the underlying dentin exposed?
What type of cementoenamel junction meeting can cause dentin hypersensitivity?
name 2 types of lines you can see in cementum repair
lines after cementum resorption, you can tell where the resorption stopped and started laying down new cementum, the cementum had been broken down, but it lays down new cementum
just like retzius lines with enamel and lines of Von Ebner with dentin
Name 2 types of cementum
The first cementum to get laid down, it has no cementocytes
the last cementum to get laid down, it is getting laid at a quicker pace so the cementoblasts get stuck in it
What happens to the cementoblasts that don't get stuck in the cellular cementum?
they migrate to the periphery of the cellular cementum and wait until they need to make more cementum
What are 3 clinical considerations with cementum?
cementoblasts start to lay cementoid around cellular debris in the periodontal ligament, it can just float there or start to fuse with the cementum as more is laid
the cementoid was laid down weird and caused a spur of cementum to come off at the CEJ, similar to enamel pearls
excessive production of cementum, usually a result of occlusal trauma
What is the main difference between cementicles and cemental spurs?
cementicles start non-connected to the tooth, and cemental spurs start connected to the tooth
What is hypercementosis usually a result of?