Enamel dictates whole tooth deformation: a finite element model study validated by a metrology method

Area of Science:

• Biomaterials Science
• Dental Biomechanics
• Structural Biology

Background:

• Understanding the biomechanical roles of tooth structures is crucial for analyzing whole tooth function under load.
• Enamel and dentin are the primary structural components of teeth, each contributing uniquely to mechanical integrity.

Purpose of the Study:

• To determine the biomechanical role of enamel and dentin in whole tooth behavior under load.
• To compare the mechanical response of intact teeth with teeth exhibiting compromised enamel integrity.

Main Methods:

• Finite Element (FE) models of human premolars were created using high-resolution micro-CT scans.
• FE models were validated through in vitro electronic speckle pattern interferometry (ESPI) experiments.
• The mechanical behavior of intact and defect-introduced teeth was simulated using validated FE models.

Main Results:

• The enamel cap is a stiff biological structure whose morphology significantly influences whole tooth mechanical behavior.
• Even with a small defect (simulating a cavity), the enamel cap largely retained its stiffness function under load.
• The study demonstrated that enamel plays a dominant role in the tooth's overall mechanical response.

Conclusions:

• Enamel, not dentin, primarily dictates the mechanical behavior of the whole tooth under typical loading conditions.
• The intrinsic stiffness and structural integrity of the enamel cap are critical for maintaining tooth function.
• These findings have implications for understanding tooth failure mechanisms and designing dental restorations.