"Dentin" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings). Descriptors are arranged in a hierarchical structure, which enables searching at various levels of specificity.
MeSH information
The hard portion of the tooth surrounding the pulp, covered by enamel on the crown and cementum on the root, which is harder and denser than bone but softer than enamel, and is thus readily abraded when left unprotected. (From Jablonski, Dictionary of Dentistry, 1992)

This graph shows the total number of publications written about "Dentin" by people in this website by year, and whether "Dentin" was a major or minor topic of these publications.
Bar chart showing 2074 publications over 29 distinct years, with a maximum of 160 publications in 2013
To see the data from this visualization as text, click here.