CF-PEEK vs. Titanium Dental Implants: Stress Distribution and Fatigue Performance in Variable Bone Qualities

Area of Science:

• Biomaterials Science
• Dental Implantology
• Finite Element Analysis

Background:

• Titanium is the gold standard for dental implants, but its high stiffness can lead to stress shielding.
• Carbon fiber-reinforced polyetheretherketone (CF-PEEK) presents a potential alternative with biomechanical properties closer to bone.

Purpose of the Study:

• To compare the biomechanical behavior of titanium and CF-PEEK dental implants.
• To evaluate their performance under various bone densities and loading conditions using finite element analysis (FEA).

Main Methods:

• A finite element model of a mandibular molar implant system was created using titanium or CF-PEEK components.
• Simulations included four bone density configurations and vertical/oblique static loads (100 N).
• Analysis focused on stress, strain, and fatigue life.

Main Results:

• Titanium implants showed higher von Mises stress (>400 MPa) under oblique loading.
• CF-PEEK implants exhibited lower stress but higher strain, with more uniform stress distribution in surrounding bone.
• CF-PEEK components demonstrated reduced fatigue life, particularly in low-density bone under oblique loads.

Conclusions:

• CF-PEEK implants facilitate more physiological load transfer and reduce stress shielding compared to titanium.
• The structural reliability of CF-PEEK requires careful consideration, especially in compromised bone conditions.
• Further material and design optimization are needed for CF-PEEK dental implants.