FATIGUE OF BIOMATERIALS: HARD TISSUES.

Area of Science:

• Biomaterials Science
• Orthopedics
• Dental Science

Background:

• Hard tissues (bone, cementum, dentin, enamel) are highly mineralized, load-bearing biological materials.
• Their fatigue and fracture behavior are critical for understanding degradation and maintaining lifelong health.
• Characterizing these tissues presents significant challenges due to size constraints and complex microstructures.

Purpose of the Study:

• To review the current understanding of hard tissue fatigue and fracture.
• To highlight the challenges in characterizing the mechanical behavior of these tissues.
• To identify unanswered questions in the field.

Main Methods:

• Review of existing literature on hard tissue biomechanics.
• Analysis of factors influencing fatigue and fracture, including loading conditions and physiological factors.
• Discussion of microstructural complexities and their impact on crack initiation and propagation.

Main Results:

• Fatigue and fracture in hard tissues are influenced by microstructure, constituents, and physiological factors like aging and disease.
• Significant challenges exist in accurately characterizing fatigue behavior due to material complexity and scale.
• The interplay between constituents, defect distribution, and crack growth dynamics remains incompletely understood.

Conclusions:

• A comprehensive understanding of hard tissue fatigue is essential for both clinical applications and biomimetic material design.
• Further research is needed to address the complexities of microstructure and constituent contributions to failure mechanisms.
• Overcoming characterization challenges will advance both biological and engineering material science.