Secondary Dentine
Definition
Dentine deposited by the odontoblasts throughout adult life inside the pulp chamber, progressively reducing its volume. Visible radiographically as a narrowing of the pulp canal and chamber, and the basis of the Kvaal and volumetric pulp-ratio methods.
- Deposited by
- Odontoblasts lining the pulp
- Timing
- Continuously through adult life
- Radiographic sign
- Narrowing of pulp chamber and canal
- Used in
- Kvaal method, volumetric pulp-ratio age estimation
Common questions
How does secondary dentine differ from primary dentine?+
Primary dentine forms before eruption and shapes the tooth, while secondary dentine is laid down slowly afterward as a normal ageing change, gradually encroaching on the pulp chamber rather than responding to injury.
Why does pulp-chamber narrowing help estimate age?+
Because deposition proceeds at a fairly steady rate through adulthood, measuring remaining pulp volume relative to tooth volume on radiographs or sections correlates with chronological age, though precision drops once the trend flattens later in life.
Can secondary dentine be confused with tertiary dentine?+
Tertiary (reparative) dentine forms rapidly and irregularly under a specific irritant such as caries, whereas secondary dentine is slow and generalized across the whole pulp chamber, so distinguishing localized reaction from whole-life ageing matters for accurate scoring.
Related terms
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- Kvaal Method
- A non-destructive radiographic method that measures pulp-to-tooth ratios at defined reference points on periapical radiographs to estimate age from secondary dentine deposition....
- Root Transparency
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