Create an account
Components of Cementum
1. Cells (cementoblasts, cementocytes and cementoclasts) 2. Fibrous matrix (Collagen type I fibers) 3. Ground substance
Components of Alveolar bone proper
1. Cells (osteoblasts, osteocytes, osteoclasts) 2. Fibrous matrix (Collagen type I fibers) 3. Ground substance
Collagen fibers of PDL
Run into bone and cementum at a 90 degree angle, perpendicular to bone and cementum. Type I, some III and oxytalan.
Collagen fibers of Cementum and Bone
Produced by either cementoblasts or osteoblasts, run parallel to DCJ. Type I fibers
The oldest, located in cervical 1/3 of root. The first cementum laid down, thin, can remove with instruments
The newest, located in apical and middle 1/3, second formed. Formed after tooth has reached functional occlusion. Continues to deposit cementum throughout life of tooth
Cellular Cementum can change to
Acellular Cementum because junctional epithelium can move apically so there's no blood supply
30% of cases. Cementum and enamel meet end to end. Hertwig Sheath broken up at right time
10% of cases. Hertwig Sheath did not break up. Dentin is exposed and patients experience hypersensitivity
Calcified bodies of cementum. May be free floating, attached or embedded. NOT seen on x-rays
Found at or near CEJ, similar to enamel pearls. Due to irregular deposition of cementum
Excessive production of cellular cementum, mainly occurs at apex. Usually found in elderly people
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together