Denatl Anatomy

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
organic material
water

What tooth structure makes up the bulk of the tooth?

true or false. dentin is avascular, it has no blood vessels
True False

the main function of the dentin is to what?

What color is dentin?

true or false. Dentin feels rough, but is softer than enamel
True False

Why does apposition of dentin matrix occur throughout the life of the tooth? We can make new dentin if needed?

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

new globules form in the partially mineralized predentin, and don't completely fuse

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

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