Biomimetic pins and screws design is reshaping oral and maxillofacial surgery by creating fixation devices that mimic the structure, mechanics, and behaviour of living tissue, from bone-like stiffness to bioactive surfaces and controlled resorption. In dentistry, this shift is visible in next‑gen pins, tacks, and screws used for guided bone regeneration (GBR), block graft fixation, and orthognathic stabilization. These solutions aim to reduce secondary surgeries, improve osseointegration, and optimise healing biology. (1),(2).
1) What makes a fixation device “biomimetic” in dentistry?
In oral surgery, biomimetic refers to materials and designs that replicate key properties of natural tissues, such as a bone-like modulus to limit stress shielding, graded or textured surfaces to cue osteogenesis, and bioresorption that aligns with the bone-healing timeline. These concepts are central to modern oral biomaterials research and are being applied to both implant surfaces and fixation hardware.(1),(2).
Two broad strategies dominate:
- Material biomimicry: Using resorbable polymers (PLLA/PLGA) or magnesium alloys that are gradually replaced by bone, eliminating routine hardware removal. Magnesium, in particular, offers metal-like strength with controlled biodegradation properties. (3), (4), (5)
- Surface and topology biomimicry: Applying bioactive or ECM‑like coatings (e.g., hydroxyapatite, collagen, BMP‑2, antimicrobial peptides) or micro/nano‑texturing to boost cell adhesion, antibacterial performance, and early bone‑to‑implant contact. (2), (6), (7)
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2) Biomimetic Pins and Screws vs. Conventional Titanium Fixation
Titanium remains a gold standard for strength and long‑term stability. However, non-resorbable hardware can require a second procedure for removal, particularly after GBR or block grafting, which adds cost and morbidity. Biomimetic magnesium screws provide comparable fixation initially, then resorb and are replaced by bone, potentially removing the need for a second surgery. A recent systematic review reported high union rates, low revision rates, and favourable safety for magnesium in bone fixation when compared with titanium, although most clinical data are still outside maxillofacial sites. (5), (8).
Clinicians should also know that magnesium degradation can release hydrogen, sometimes perceived as tingling or crepitation; this is typically self‑limiting and reflects the device’s resorption mechanism. A 2024 GBR case report using a resorbable magnesium membrane and screws in the posterior mandible documented sensation during early healing, followed by dense vascular bone at 3 months. (9)
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3) Biomimetic Pins and Screws with nature‑inspired mechanics: magnesium and polymer systems
- Resorbable magnesium (e.g., MAGNEZIX®): Designed to match bone‑like biomechanics, provide interfragmentary compression, and resorb homogeneously as new bone forms. Clinical evidence in orthopaedics supports non‑inferiority to titanium for certain indications, and design elements (self‑tapping tip, differential pitch) target stable, compressive fixation during healing. (5),(10), (11)
- PLLA/PLGA ultrasonic pins (SonicPin/SonicWeld Rx®): Ultrasound‑activated resorbable pins liquefy locally to “weld” into cancellous bone and polymer plates/meshes, offering 3D primary stability without later removal—a technique well established in cranio‑maxillofacial surgery. (3), (12)
- Resorbable polymer plates and screws (RAPIDSORB™, Delta+): These PLGA‑based systems retain strength through the critical 8–12 weeks of bone healing and then degrade to CO₂ and H₂O over roughly 8–13 months, reducing stress shielding and avoiding routine retrieval. (4), (13)
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4) Biomimetic coatings and surface treatments for dental pins and screws
Even when the core material is metallic, biomimetic surface engineering can drive outcomes:
- Bioactive coatings (hydroxyapatite, BMP‑2, ECM proteins) have shown measurable improvements in bone‑to‑implant contact and early osseointegration in meta‑analyses and preclinical/clinical studies. The key is tuning the dose and release to avoid burst effects and adverse reactions. (8), (2)
- Growth‑factor–bearing apatite layers can enhance osteogenesis, but BMP‑2 requires controlled delivery to stay within osteoinductive thresholds and prevent complications—highlighting why carrier and coating design matter. (14)
- Antibacterial/osteogenic hybrid surfaces (e.g., copper‑incorporated biomimetic micro/nano topographies) show enhanced stem‑cell osteogenesis and reduced oral pathogen viability in vitro, pointing to future infection‑resistant fixation hardware. (6)
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5) Clinical use cases: membrane fixation, block grafts, and tenting—where pins and tacks shine
For GBR, immobilising the clot–graft–membrane complex is crucial. Titanium tacks and pins remain widely adopted for collagen membrane fixation in horizontal and vertical augmentation, sinus lifts, and fenestration repair; many systems allow no pre‑drilling and are designed for easy retrieval. (15), (16) [Geistlich…Pharma AG]
When the goal is to avoid a second surgery, newer systems offer absorbable magnesium pins within the same kit (e.g., creos™ pin fixation), giving clinicians a choice between magnesium (resorbable) and titanium (removable) based on case demands. (17)
Practical options you’ll see in labs and kits include:
- Precision tack systems for membrane fixation and tenting (e.g., Osteogenics Pro‑fix™; Meisinger Master‑Pin; Geistlich Tack System).
- Off‑the‑shelf titanium tacks and self‑drilling micro‑screws sized specifically for GBR stabilisation, with instrumentation for fast pickup, transfer, and removal.
For resorbable plate‑and‑pin constructs (e.g., paediatric craniofacial cases or thin cortices), ultrasonic PDLLA pins and PLGA plate/screw systems provide temporary, bone‑friendly stability aligned to growth and remodelling needs. [KLS Martin…icWeld Rx®], [RAPIDSORB™…uy Synthes]
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6) Beyond metals: polymer and composite routes to “bone‑like” mechanics
PEEK (polyetheretherketone) and carbon‑fibre–reinforced PEEK offer bone‑comparable stiffness and radiolucency, reducing stress shielding and artefacts. Reviews and finite‑element analyses in oral applications suggest that while CFR‑PEEK plates/screws can lower hardware stresses and match bone mechanics, displacements can be slightly higher than titanium, emphasising the need for proper design and case selection. [PEEK for O…hesive …], [Effect of…gittal …]
From an engineering standpoint, thread geometry is also a biomimetic lever. Studies show square or trapezoidal thread forms and wider diameters can reduce peri‑implant stresses and micromovement, improving primary stability—principles applicable to mini‑screws and fixation screws used around grafts and plates. [Investigat…on the …], [Biomechani…dental …]
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Practical selection guide (quick take)
FAQs
Do resorbable magnesium screws really convert to bone?
Clinical and preclinical data indicate magnesium alloys can be gradually resorbed and replaced by bone, with CE‑approved implants in orthopaedics showing non‑inferiority to titanium in defined indications. Controlled corrosion profiles and oxide films help maintain integrity during healing. [Technology…ntellix AG], [Compressio…orld-wide.]
Are there downsides to biomimetic systems?
All resorbables require case selection and healing time alignment. Hydrogen release (magnesium) and strength trade‑offs (some polymers) are known considerations; planning, fixation geometry, and patient factors determine success. [Bioabsorba…n Bone …], [RAPIDSORB™…uy Synthes]
Where do these devices fit in GBR workflows?
Use tacks/pins to immobilise membranes and grafts, tenting screws to preserve space, and block graft screws for rigid fixation—choosing titanium (removal) or resorbable (no removal) based on defect size, tissue thickness, and planned re‑entry. [Pro-fix™ P…e Fixation], [Geistlich…Pharma AG]
Key takeaways for clinicians
- Biomimetic dental screws and pins bring bone‑like mechanics, bioactive surfaces, and smart resorption to daily oral surgery tasks, promising fewer second surgeries and more biologically harmonious healing. [Research p…l medicine], [Biomimetic…ate – MDPI]
- Evidence is growing: systematic reviews and case reports support magnesium and bioactive‑coated solutions; polymers remain valuable for paediatric and select adult cases. Continue to match the device to the indication. [Bioabsorba…n Bone …], [Bioactive…- Springer]
- Design still matters—from thread geometry to surface chemistry—so choose systems with validated biomechanical and biological performance. [Investigat…on the …], [Biomimetic…ate – MDPI]
References
Biomimetic Pins and Screws: Advancements in Dental Surgery
1-Research progress of biomimetic materials in oral medicine
2-Biomimetic Aspects of Oral and Dentofacial Regeneration
3- SonicWeld Rx®
SonicWeld Rx® is a revolutionary technique for use in craniomaxillofacial osteosynthesis. It combines highly advanced ultrasound technology with resorbable implants to provide extremely stable fixation, eliminating the need for a second operation.
4- RAPIDSORB™ Resorbable Fixation System
5-MAGNEZIX® – a milestone in material research
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