Temporomandibular Joint Arthroplasty Using Metal-on-Metal and Acrylic-on-Metal Configurations : Wear In Laboratory...

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Mechanical Engineering

Background:

• Long-term performance of temporomandibular joint (TMJ) implants is significantly influenced by wear.
• Understanding wear mechanisms is critical for developing durable TMJ arthroplasty solutions.

Purpose of the Study:

• To compare the wear performance of metal-on-metal TMJ implants against acrylic-on-metal and polyethylene-on-metal configurations.
• To analyze wear characteristics of retrieved and laboratory-tested TMJ implants.

Main Methods:

• Optical microscopy and scanning electron microscopy (SEM) were used to examine retrieved and laboratory-tested TMJ implants.
• Volumetric wear was quantified for different implant material pairings under laboratory conditions.

Main Results:

• Metal-on-metal TMJ implants demonstrated volumetric wear an order of magnitude lower than acrylic-on-metal implants in laboratory tests.
• The wear rate of metal-on-metal implants was approximately half that reported for polyethylene-on-metal implants.
• Retrieved metal-on-metal implants showed abrasive wear with smaller wear zones compared to acrylic-on-metal implants.

Conclusions:

• Metal-on-metal bearing surfaces offer superior wear resistance for temporomandibular joint implants.
• Further research into wear characterization and minimization is essential for advancing TMJ arthroplasty.
• These findings support the continued development of metal-on-metal designs for improved TMJ implant longevity.