Dr. Homero Hermosillo, board-certified facial plastic surgeon in Monterrey, Mexico

OUR MATERIAL STANDARD

Why Dr. Hermosillo Never Uses Standard PEEK

Dr. Homero Hermosillo made a deliberate decision: he does not offer standard PEEK implants. Every custom implant he designs uses PEEK/DMI bone- and tissue-fusing technology—because tolerating a foreign object in your face is not the same as healing with one.

THE INDUSTRY BASELINE

What Is Standard PEEK, and Why Isn’t It Enough?

PEEK (polyether ether ketone) has been the standard material for custom facial implants for over a decade, and for good reason. It’s lightweight, mechanically strong, and radiolucent—meaning it doesn’t scatter or obscure CT and MRI imaging the way metal implants can, which matters if you ever need future imaging. Standard PEEK is also biocompatible, meaning your body tolerates its presence without an active immune reaction.

But biocompatible only means your body will not attack it. It does not mean your body integrates with it. For decades, the industry treated “biocompatible” as the finish line. Dr. Hermosillo does not.

THE HIDDEN RISK

The Hidden Flaw Inside Every Standard PEEK Implant

Biocompatible only means a material passes three narrow tests: no cytotoxicity, no significant acute inflammatory response, and chemical stability in tissue. None of that is the same as functional integration. Standard PEEK, like solid silicone, is bio-inert: the body responds to it by building a fibrous capsule around it. That capsule is not integration. It is defensive isolation.

Structurally, that capsule creates a mechanically weak interface, a potential sliding plane, and a biological barrier between the implant and the bone. And that interface is never static—it is subject to cyclic chewing loads, constant muscle activity, repetitive microimpacts, and the bone’s own adaptive changes. Without direct integration, the system never reaches primary structural stability: the bone never forms a direct union, and the soft tissue never forms a functional seal.

  • Suboptimal load distribution across the implant-bone interface.
  • Relative micro-displacements every time you chew, speak, or move your jaw.
  • Localized mechanical stress that the bone was never designed to absorb.
  • Progressive mechanical erosion—not simple resorption—of the bone in contact with the implant.

The real problem isn’t micromovement itself. It is the absence of structural integration that allows physiological load transmission. Left uncorrected, this can progress from healthy bone resorption—a normal, adaptive process—into mechanical erosion: a pathological, progressive, and largely irreversible loss of bone driven by sustained pressure and friction against an implant that was never built to fuse with it. This is not unique to one brand of PEEK, and it is not a rare complication. It is a documented, mechanical consequence of any bio-inert material—standard PEEK, silicone, or porous polyethylene—that is not engineered to integrate with living bone. It is precisely why Dr. Hermosillo will not place a standard PEEK implant in a patient’s face.

MECHANICAL COMPATIBILITY

Why a Good Modulus Alone Doesn’t Solve the Problem

Matching a material’s stiffness to bone—its Young’s modulus—reduces how differently the two deform under load. Titanium, at roughly 110 GPa, is far stiffer than bone. It can be so stiff that it shields the underlying bone from normal physiological loading, a phenomenon called stress shielding, causing that bone to gradually resorb from disuse.

PEEK is much closer to the modulus of cortical bone (roughly 3–4 GPa), which is part of why it became popular. But mechanical compatibility is not the same as biological integration. Without a bioactive surface, PEEK is still bio-inert, and the result is still a fibrous capsule. A favorable modulus is a necessary condition—never a sufficient one.

Silicone: Simple, But Prone to Drift

Widely used and easy to remove, but prone to displacement, constant micromovement at the interface, pressure-driven bone resorption, and progressively worsening asymmetry over time.

Porous Polyethylene: Better Fixation, Harder to Revise

Tissue can grow into its pores, improving stability over silicone, but that same ingrowth makes revision surgery more aggressive and removal more likely to damage surrounding tissue.

THE END OF THE FOREIGN OBJECT

PEEK/DMI: The Only Implant Material Dr. Hermosillo Uses

DMI (Direct Molecular Integration) implants are not simply another PEEK product—they are a fundamental reimagining of the implant as a biological scaffold. The PEEK matrix is modified with hydroxyapatite (HA), a mineral chemically similar to bone itself, which increases surface energy, encourages osteoblasts to adhere directly to the implant, and reduces fibrous capsule formation. Dr. Hermosillo requires this dual-interface design for every patient: bone that fuses directly to the implant, and soft tissue that adheres to it just as directly—sealing the mechanically weak gap that standard PEEK leaves behind.

Osseointegration (Skeletal Lock)

Hydroxyapatite in the implant's engineered surface encourages your own bone cells to grow directly into its matrix, creating a fused, load-bearing bond rather than an implant that simply rests against the bone.

Soft-Tissue Integration (Mechanical Lock)

Collagen and fibroblasts weave directly into the implant's surface, forming a natural seal instead of the slippery scar-tissue capsule that surrounds a bio-inert implant.

Lower Infection & Biofilm Risk

The engineered surface is designed to inhibit biofilm formation, one of the primary drivers of implant-related infection and rejection.

THE CHOICE

Standard PEEK vs. PEEK/DMI: Why Dr. Hermosillo Only Offers One

Standard PEEK (Not Offered by Dr. Hermosillo)

  • Bio-inert—your body only tolerates it, never fuses with it
  • Isolated by a fibrous scar-tissue capsule—a hidden, unintegrated gap
  • Rests against bone instead of fusing to it
  • Fibrous capsule creates a mechanically weak, unstable interface
  • Prone to micromovement and progressive bone erosion over time
  • A space-filler, not a living part of your anatomy

PEEK/DMI (The Only Material Dr. Hermosillo Uses)

  • Bio-active surface technology enhanced with hydroxyapatite
  • True osseointegration—bone fuses directly into the implant matrix
  • Soft tissue integrates to form a natural, sealed barrier
  • ~30% less post-operative swelling in comparative data
  • Engineered to reduce infection, biofilm, and rejection risk

TESTED & CERTIFIED

Rigorously Tested for Safety

  • ISO 10993-5 cytotoxicity testing completed
  • ISO 10993-10 irritation & sensitization testing completed
  • ISO 10993-11 systemic toxicity testing completed
  • ISO 10993-23 irritation testing completed
  • REACH compliant (EC 1907/2006)
  • Manufactured in the U.S. under ISO 13485 quality certification
  • Compatible with multiple sterilization methods—steam autoclave, gamma, e-beam, and ethylene oxide—for flexible surgical workflows

COMMON QUESTIONS

Implant Material: Frequently Asked Questions

Because standard PEEK is bio-inert: the body walls it off in a fibrous capsule instead of fusing with it, creating a mechanically weak, unintegrated interface that is prone to micromovement and, over time, progressive bone erosion. Dr. Hermosillo made the decision to use only PEEK/DMI bone- and tissue-fusing implants, engineered to integrate with a patient’s own bone and soft tissue instead of simply being tolerated by it.
PEEK (polyether ether ketone) is a lightweight, mechanically strong, radiolucent polymer that has been the standard material for custom facial implants for over a decade. It’s biocompatible, meaning the body tolerates it without an active immune reaction, and it doesn’t interfere with future CT or MRI imaging the way metal implants can.
Biocompatibility only confirms that a material is tolerated—no cytotoxicity, no significant acute inflammatory response, chemical stability. It says nothing about active integration. A bio-inert material like silicone or standard PEEK still forms a fibrous capsule that is mechanically unstable and biologically passive, blocking physiological load transmission and setting up long-term complications.
Not on its own—it’s a symptom. The root cause is the lack of solid structural integration between implant and bone. Without intimate integration, chewing and muscle loads aren’t transmitted properly, which produces instability, bone erosion, and the absence of durable primary stability.
Bio-inert means a material is tolerated by the body but not actively integrated with it. Rather than fusing with your bone or soft tissue, the body forms a thin capsule of scar tissue around a bio-inert implant, leaving a microscopic unintegrated space between the implant and your own tissue.
DMI (Direct Molecular Integration) implants use the same trusted PEEK platform as standard implants, with an added engineered surface technology that promotes true integration—bone grows directly into the implant, and soft tissue forms a natural seal—rather than the body simply tolerating it as a foreign object.
No. Dr. Hermosillo does not offer standard PEEK implants for any procedure. Every custom implant he designs for facial feminization, facial masculinization, or orthognathic cases uses PEEK/DMI bone- and tissue-fusing technology, built from your own CT scan.
DMI implants have completed ISO 10993-5 cytotoxicity, ISO 10993-10 irritation and sensitization, ISO 10993-11 systemic toxicity, and ISO 10993-23 irritation testing, and are REACH compliant. Manufacturing takes place in the U.S. under ISO 13485 quality certification.
Material can influence certain aspects of recovery. Comparative data on DMI bone and tissue fusing implants shows approximately 30% less post-operative swelling than standard bio-inert implants. Your surgeon will walk you through what to expect for your specific procedure.

Considering facial feminization surgery? See how custom PEEK/DMI implants are used for FFS in Monterrey.

Considering facial masculinization surgery? See how custom implants are used for FMS in Monterrey.

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