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Cross-section of a tooth. B is dentin. Dentin (/ ˈ d ɛ n t ɪ n / DEN-tin) (American English) or dentine (/ ˈ d ɛ n ˌ t iː n / DEN-teen or / ˌ d ɛ n ˈ t iː n / DEN-TEEN) (British English) (Latin: substantia eburnea) is a calcified tissue of the body and, along with enamel, cementum, and pulp, is one of the four major components of teeth.
The dental canaliculi (sometimes called dentinal tubules) are the blood supply of a tooth. [4] Odontoblast process run in the canaliculi that transverse the dentin layer and are referred as dentinal tubules. [5] The number and size of the canaliculi decrease as the tubules move away from the pulp and toward the enamel or cementum.
The hydrodynamic theory proposes that when dentinal tubules are exposed at the pulp and dentine surface, external stimuli cause changes in fluid flow. [7] Dentinal tubules may become exposed due to various reasons: e.g. dental erosion, enamel loss and periodontal diseases. [8]
Dentin has microscopic channels, called dentinal tubules, which radiate outward through the dentin from the pulp cavity to the exterior cementum or enamel border. [17] The diameter of these tubules range from 2.5 μm near the pulp, to 1.2 μm in the midportion, and 900 nm near the dentino-enamel junction. [18]
Cross-sectional diagram of a molar tooth. 1: crown, 2: root, 3: enamel, 4: dentin and dentin tubules, 5: pulp chamber, 6: blood vessels and nerve within root canal, 7: periodontal ligament, 8: apex and periapical region, 9: alveolar bone VITA classical A1-D4 shade guide arranged according to value VITA classical A1-D4 shade guide arranged according to chroma; A: red-brown, B: red-yellow, C ...
Nutrition for odontoblasts within the dentin comes through the dentinal tubules from tissue fluid that originally traveled from the blood vessels located in the adjacent pulp tissue. Within each dentinal tubule is a space of variable size containing dentinal fluid, an odontoblastic process, and possibly an afferent axon (see next discussion).
English: SVG version of image, adding several aspects not reproducible by any photograph, including the shape and orientation of the enamel rods (interlocking keyholes oriented away from the surface of the dentin) and of the dentin tubules (S-shaped fibers stretching between the pulp and the enamel/ cementum layer, thicker on the pulp end and narrow on the enamel end).
Derived from the mesoderm, dentin is a mineralised, flexible tissue with a weight percentage of 70% inorganic material, 20% organic material, and 10% fluid. On the other hand, enamel, which comes from ectoderm, is an extremely brittle tissue that is mainly made up of water (about 3%), trace organic matrix (approximately 1%), and the mineral ...