Study on fracture behavior of molars based on three-dimensional high-precision computerized tomography scanning and...

Area of Science:

• Biomaterials Science
• Computational Mechanics
• Dental Research

Background:

• Tooth failure is a complex process influenced by internal structure and external forces.
• Understanding molar failure mechanics is crucial for restorative dentistry and material development.

Purpose of the Study:

• To investigate the gradual failure process of molars using advanced 3D numerical simulations.
• To analyze crack initiation, propagation, and final failure patterns under compression.

Main Methods:

• Three-dimensional numerical simulations were performed on realistic molar models.
• Computerized tomography, digital image processing, and 3D matrix mapping were used to create models.
• The 3D realistic failure process analysis (RFPA3D) method simulated tooth failure.

Main Results:

• Microcracks initiate, nucleate, and interconnect to form macroscopic cracks under over-compression.
• Macroscopic crack propagation leads to fracture surfaces and penetrating cracks, indicating tooth failure.
• Material heterogeneity significantly affects mechanical properties and fracture modes (crown, crown-root, or root fractures).

Conclusions:

• Tooth failure is a progressive process involving microcrack coalescence into macrocracks.
• Material heterogeneity is a critical determinant of tooth fracture patterns and mechanical response.
• 3D numerical simulations provide valuable insights into the biomechanics of molar failure.