The fluid in teeth is essentially an ultrafiltrate of blood plasma originating from the pulp capillaries. It's a liquid found within the dentin, the main body of the tooth.
Composition and Origin
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Origin: This fluid isn't just random water; it's derived from blood within the dental pulp, the soft tissue at the center of the tooth containing nerves and blood vessels. Specifically, it's an ultrafiltrate, meaning it's been filtered from the blood within the capillaries of the pulp.
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Composition: Because it's an ultrafiltrate of blood, its composition is similar to blood plasma. It contains various components found in plasma, contributing to the overall health and function of the tooth.
Location and Quantity
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Location: This fluid resides within the dentinal tubules, microscopic channels that run throughout the dentin.
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Quantity: The amount of fluid varies depending on the location within the dentin. Superficial dentin contains about 1% free fluid, whereas deep dentin, closer to the pulp, can contain approximately 22% of its total volume as fluid.
Significance
The fluid within the dentinal tubules plays a role in:
- Tooth sensitivity: Movement of this fluid can stimulate nerve endings in the pulp, contributing to tooth sensitivity, especially in response to temperature changes or pressure.
- Nutrient transport: Although limited, it likely helps transport nutrients to the dentin.
- Defense mechanisms: It may play a minor role in the tooth's defense against bacterial invasion.
In summary, the fluid in teeth is a plasma-like liquid found within the dentin, originating from the blood vessels in the pulp and contributing to the tooth's overall physiology and sensitivity.
