Yes, based on research, the flexural strength of dentin does decrease with age. Specifically, studies indicate a significant reduction in dentin's strength and fracture resistance as people get older.
Understanding Age-Related Changes in Dentin
While the question simply asks if dentin decreases, it is important to specify what is decreasing. It's not necessarily the volume of dentin, but rather its structural integrity and strength. Research has shown that the material properties of dentin change with age, leading to decreased performance.
Key Findings Regarding Dentin and Age
- Reduced Flexural Strength: As we age, the dentin's ability to withstand bending or flexing decreases substantially. One study found that the flexural strength of coronal dentin reduces by almost 20 MPa per decade, starting after adulthood.
- Decreased Fracture Resistance: The energy required to fracture dentin also declines significantly with age. A study comparing young patients (age ≤ 30) and older patients (age ≥ 55) showed a 75% reduction in the energy needed to fracture dentin in the older group. (Arola et al., 2009)
Why Does Dentin Change with Age?
The precise reasons for these changes are complex and multifactorial, likely involving:
- Changes in Mineral Content: Alterations in the mineral structure and composition of dentin can affect its mechanical properties.
- Collagen Modifications: The collagen matrix, which forms the scaffolding of dentin, might undergo structural changes.
- Accumulated Damage: Over time, micro-fractures and other damage can accumulate within the dentin, leading to weakening.
Practical Implications
The age-related weakening of dentin has clinical relevance, potentially leading to:
- Increased susceptibility to dental fractures
- Higher risk of tooth wear and erosion
- Greater vulnerability to damage from dental procedures
Summary
The research clearly indicates that while the amount of dentin may not decrease, its quality and strength do significantly diminish with age. This is an important factor to consider in dental health and treatment planning. The research highlights a significant drop in the flexural strength of dentin (almost 20 MPa per decade after adulthood) and a considerable reduction (75%) in the energy required to fracture dentin in older patients (age ≥ 55), compared to younger ones (age ≤ 30) (Arola et al., 2009).
