Card Set Information
unexposed inner portion of the tooth, found in the crown and root and discussed as one unit
where does the dentin come from?
What percent of dentin is made up of:
mineralized inorganic material
What tooth structure makes up the bulk of the tooth?
true or false. dentin is avascular, it has no blood vessels
the main function of the dentin is to what?
protect the pulp
What color is dentin?
true or false. Dentin feels rough, but is softer than enamel
Why does apposition of dentin matrix occur throughout the life of the tooth? We can make new dentin if needed?
because the odontoblasts remain living in the outer pulpal wall
process of dentin matrix formation
initial material laid down by the odontoblasts; they were the outer cells of dental papilla
What are the two types of mineralization of dentin?
Ca hydroxyapatite crystals form as globules in the predentin, expand, and completely fuse together
primary mineralization of dentin
new globules form in the partially mineralized predentin, and don't completely fuse
secondary mineralization of dentin
long tube in dentin that extends from the DEJ to the DCJ into the pulp, and run PERPENDICULAR to the DEJ
What 3 structures are contained in the dentinal tubules?
long cellular extension still attached to the cell body of the odontoblast within the pulp, in the dentinal tubule
odontoblastic process (keeps forming new dentin)
myelinated axon located within the pulp and involved in the sensation of PAIN only, in the dentinal tubule
dentin that creates the wall of the dentinal tubule
dentin that is found between each dentinal tubule
first dentin that is formed
layer of dentin around the outer pulpal wall
first dentin formed, and formed in a tooth before the completion of the apical formation
dentin formed after the completion of the apical foramen, and continues to form throughout the life of the tooth, fomred to protect the pulp
dentin formed quickly and as a result to injury, forms underneath the exposed dentins tubules along the outer pulpal wall
dentinal tubules diameter__________with age