单词	dentin
释义	dentin noun den·​tin ˈden-tᵊn  variants or dentine ˈden-ˌtēn  den-ˈ : a calcareous material similar to but harder and denser than bone that composes the principal mass of a tooth see tooth illustration dentinal den-ˈtē-nᵊl  ˈden-tə-nəl  adjective Example Sentences Recent Examples on the Web Shark teeth have dentin, like human teeth, according to the Dental Center of Indiana. Olivia Munson, USA TODAY, 9 Aug. 2022 This cycle of violence was revealed by a second signal in Fred’s tusks, encoded in oxygen isotopes, which tracked the steady sawtooth tick of the seasons passing by and provided a kind of calendar kept in dentin. Peter Brannen, The Atlantic, 22 June 2022 His teeth are chewed down to nubs, the dentin and nerves exposed. Gene Weingarten, Washington Post, 8 Nov. 2021 Once the enamel is dissolved, the underlying portion of the tooth, the dentin, is softer and more easily destroyed by the acid, thus leading to wider and deeper expansion of the cavity. Jeffrey Ebersole, The Conversation, 18 May 2021 The erosion of enamel can also cause teeth to become more yellow over the long-term, as the yellow-colored dentin, the inner layer of tooth, is exposed. Lisa Drayer, CNN, 3 Oct. 2019 According to a case study from the American Academy of Pediatric Dentistry, a compound odontoma is considered a developmental anomaly where tumors made of formed of enamel and dentin are formed. Doha Madani, NBC News, 1 Aug. 2019 This may eventually compromise the underlying dentin, which is a tissue containing hollow canals called tubules. Korin Miller, SELF, 18 Apr. 2018 Like human teeth, the dragonfish’s teeth have a dense inner dentin layer surrounded by an outer enamellike layer. Helen Santoro, Science | AAAS, 5 June 2019 See More Word History First Known Use circa 1845, in the meaning defined above Kids Definition dentin noun den·​tin ˈden-tᵊn  variants or dentine ˈden-ˌtēn : a calcium-containing material that is similar to bone but harder and that makes up the main part of a tooth Medical Definition dentin noun den·​tin ˈdent-ᵊn  variants or dentine ˈden-ˌtēn  den-ˈtēn  : a calcareous material similar to bone but harder and denser that composes the principal mass of a tooth, is formed by the odontoblasts of the surface of the dental papilla, and consists of a matrix containing minute parallel tubules which open into the pulp cavity and during life contain processes of the cells of the pulp compare cementum, enamel
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