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Dental erosion and loss of enamel increase the patency of dentinal tubules. 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 ...
Within each dentinal tubule is a space of variable size containing dentinal fluid, an odontoblastic process, and possibly an afferent axon (see next discussion). The dentinal fluid in the tubule presumably also includes the tissue fluid surrounding the cell membrane of the odontoblast, which is continuous from the cell body in the pulp. [2]
The dentinal tubules extend from the dentinoenamel junction (DEJ) in the crown area, or dentinocemental junction (DCJ) in the root area, to the outer wall of the pulp. [9] From the outer surface of the dentin to the area nearest the pulp, these tubules follow an S-shaped path. The diameter and density of the tubules are greatest near the pulp.
The glutaraldehyde in Gluma works by occluding (blocking) the microscopic tubules that compose dentin, thereby preventing the flow of fluid and decreasing sensitivity. [4] Gluteraldehyde induces coagulation of proteins in dentinal tubules, which reacts with the serum albumin in the dentinal fluid to cause its precipitation.
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.
Failure of root canal treatment is directly related to the lack of seal on the coronal 1/3 and apical 1/3 portion. A. Coronal 1/3 The problem is with the Obtura backfill that is used in the warm gutta percha technique. Under the surgical microscope, there is an obvious gap between the heated and cooled gutta percha and the dentinal wall.
The diameter of the dentinal tubules is largest near the pulp (about 2.5 μm) and smallest (about 900 nm) at the junction of dentin and enamel. [82] The carious process continues through the dentinal tubules, which are responsible for the triangular patterns resulting from the progression of caries deep into the tooth.
In dentistry, the smear layer is a layer found on root canal walls after root canal instrumentation. It consists of microcrystalline and organic particle debris. It was first described in 1975 and research has been performed since then to evaluate its importance in bacteria penetration into the dentinal tubules and its effects on endodontic treatment.