Cementum Annuli
Definition
Incremental growth layers in cementum, deposited at a rate of approximately one pair of translucent and opaque bands per year throughout adult life. Counted in a thin ground section viewed under transmitted light microscopy to estimate age at death, typically within plus or minus two to three years.
- Structure
- Incremental translucent and opaque cementum bands
- Deposition rate
- About one band pair per year
- Viewing method
- Ground thin section, transmitted light microscopy
- Accuracy
- Plus or minus two to three years
- Applies through
- Adult life
Common questions
Is cementum annuli counting the same method as cementum annulation?+
Yes, they describe the same biological structure and technique, cementum annuli being the more general anatomical term for the incremental bands that cementum annulation analysis counts to estimate age.
Why is cementum annuli counting preferred for adult age estimation over skeletal methods?+
Skeletal ossification markers used for younger individuals close and stop changing once growth ends, while cementum keeps depositing new layers throughout adult life, giving a continuing biological clock that skeletal methods lack past skeletal maturity.
Related terms
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