Don't Want Metal in Your Implant? PEEK Might Be the Answer
Anyone who has had a dental implant may be familiar with this experience: post-procedure X-rays show the metal implant as a bright white mass, and the dentist has to look carefully to assess the condition of the surrounding bone.
Then there’s the aesthetic problem: for patients with thin gum tissue near the front teeth, the metal implant casts a grayish shadow through the gum line. Something always looks slightly off when you smile.
These are problems that titanium alloy implants haven’t solved in decades of clinical use — because they’re inherent properties of the material itself. Switching brands doesn’t help.
PEEK can.
The Most Immediate Benefits
PEEK is radiolucent on X-rays. During follow-up appointments, the dentist can clearly see how bone healing is progressing and whether there are any signs of infection — no more squinting at a field of artifacts trying to guess.
PEEK is ivory-colored, closely matching natural tooth tissue. Even in patients with very thin gum tissue, there’s no metal shadow showing through.
The Deeper Reason
Titanium alloy has a long-standing problem: it’s too stiff.
Human cortical jaw bone has an elastic modulus of approximately 14–18 GPa. Titanium alloy comes in at 110–120 GPa — six to seven times stiffer. What happens when an implant is so much harder than the surrounding bone?
During chewing, most of the mechanical load is borne by the implant, leaving the surrounding bone relatively unstimulated. Bone is a “use it or lose it” tissue — without load stimulus, it gradually resorbs. This phenomenon is called “stress shielding,” and it’s one of the primary reasons for long-term peri-implant bone loss with titanium implants.
PEEK has an elastic modulus of 3–4 GPa, much closer to bone. Rather than stealing mechanical load from the bone, PEEK allows forces to be distributed more uniformly. Over the long term, the surrounding bone stays healthier.
Where It’s Being Used
The most clinically mature PEEK application in dentistry today is abutments — the connector piece between the implant fixture and the crown.
PEEK abutments completely eliminate metallic show-through, making them particularly well-suited for anterior (front) tooth restorations. Some clinicians also use PEEK for temporary abutments during the healing phase — more comfortable to wear, with better gingival contour shaping outcomes.
Another major application is removable partial denture frameworks. Traditional cobalt-chromium alloy frameworks are heavy and rigid, with metal clasps visible when the patient smiles. Some patients are also allergic to metal. PEEK frameworks are lighter, more flexible, more natural-looking, and much more comfortable to wear.
It’s Not Perfect
PEEK’s osseointegration is genuinely inferior to titanium — the surface is too smooth for bone to readily grow onto.
However, this is an active area of development. Surface roughening techniques including sandblasting and acid etching, plasma treatment, and hydroxyapatite coatings are all being used to increase PEEK surface roughness and biological activity. 3D-printed porous PEEK structures that allow bone ingrowth are also being explored.
In the near term, PEEK won’t replace titanium across the board. But for cases where aesthetics are a priority and bone quality is good, it has already become a highly competitive option.
Dental practices interested in custom PEEK abutments or denture framework solutions are welcome to reach out to our technical team.