Study Identifies Dentin Yellowness as a Predictor of Mechanical Stiffness in Aging Teeth
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Event tier C · Tier ceiling 74 · LONGIFI_SIGNAL_V1
Quick take
A cross-sectional study reveals that dentin yellowness correlates more strongly with mechanical stiffness than with advanced glycation end-product accumulation, indicating that tooth color could serve as a noninvasive biomarker of structural dental aging.
What happened
Researchers from Lion Corporation, the Max Planck Institute of Colloids and Interfaces, Osaka University, and StemRIM analyzed extracted human premolars and molars from donors aged 16 to 77 to evaluate relationships between tooth color, mechanical properties, and advanced glycation end-product (AGE) accumulation.
The researchers measured yellowness (b*) via optical microscopy, Young's modulus using position-resolved nanoindentation, and pentosidine concentration using high-performance liquid chromatography across four anatomical regions of the crown and root.
While yellowness, Young's modulus, and pentosidine concentration all increased significantly with age, a strong positive correlation was identified specifically between yellowness and Young's modulus in most dentin regions, whereas no consistent correlation was found between pentosidine concentration and mechanical stiffness.
Why it matters
The findings demonstrate that age-related tooth yellowing is directly associated with physical mechanical changes in dentin, moving the clinical understanding of tooth discoloration beyond cosmetic considerations.
The study observed more pronounced age-related mechanical and color changes in root dentin than in crown dentin, indicating anatomical variation in the structural aging process of human teeth.
Because pentosidine concentration did not consistently correlate with Young's modulus, the mechanical hardening of aging dentin may involve structural alterations distinct from advanced glycation end-product accumulation alone.
Market impact
The study supports the development of noninvasive, optical diagnostic tools in clinical dentistry to assess the structural integrity of teeth and predict fracture risks in elderly populations.
The lack of active pipelines targeting dental aging or dental tissue regeneration among monitored longevity biotechs indicates that oral longevity remains an open area for therapeutic translation.
What comes next
Subsequent translational research is expected to evaluate whether in vivo optical colorimetric measurements can reliably predict tooth structural decline and guide preventive interventions in clinical settings.
Sources
- NCBIPUBMED:LONGEVITY_RESEARCH