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Nanostructural Analysis of Age-Related Changes Affecting Human Dentin.
Chika Akabane1, Mitsuo Kimura2, Yukio Yamamoto2
1Research and Development Headquarters, LION Corporation, 7 Chome-2-1, Hirai, Edogawa, Tokyo, 132-0035, Japan. chika_a@lion.co.jp.
Calcified Tissue International
|January 3, 2025
Summary
Human dentin
Area of Science:
- Biomaterials Science
- Nanotechnology
- Dental Research
Background:
- Human dentin's lifelong function necessitates extreme durability against repetitive loading.
- Understanding dentin's nanostructure and age-related changes is crucial for elucidating its mechanical properties.
- Previous studies have limited comprehensive analysis of dentin's overall nanostructure and aging effects.
Purpose of the Study:
- To characterize human dentin's mineral particle characteristics.
- To investigate age-related changes in dentin nanostructure using advanced X-ray scattering techniques.
Main Methods:
- Utilized synchrotron scanning small- and wide-angle X-ray scattering (SAXS/WAXS).
- Analyzed 30 human molar and premolar teeth from individuals aged 16 to 77 years.
- Acquired 2D maps of nanostructural features to assess mineral particle size, orientation, and thickness.
Main Results:
- Identified a negative gradient in mineral particle size towards the pulp chamber.
- Observed position-dependent preferential orientation of mineral particles, consistent across tooth types.
- Found a significant age-related increase in mineral particle thickness in the inner crown.
Conclusions:
- Dentin's nanostructure exhibits distinct gradients and orientation patterns.
- Age-related changes, specifically increased mineral particle thickness, may contribute to tubule occlusion.
- These nanostructural alterations likely impact the mechanical performance and durability of teeth over time.
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