A groundbreaking clinical trial has been successfully conducted by a team of Korean researchers, marking a world first for a next-generation implant alloy. This innovative material surpasses traditional titanium in strength while more closely mimicking the physical properties of bone.
Hallym University Sacred Heart Hospital announced on Thursday that Professors Yang Byeong-eun, Byeon Su-hwan, and Park Sang-yoon from its Department of Oral and Maxillofacial Surgery have published their findings in the latest issue of the Journal of Functional Biomaterials (Impact Factor: 5.2).
Pure titanium is currently the most widely used metal for dental implants. While it boasts excellent biocompatibility, its strength and durability aren’t always optimal.
This can be particularly problematic for narrow-diameter implants or in patients with strong biting forces, where long-term use may lead to fracture risks.
Another significant concern is a phenomenon known as stress shielding.
This occurs when the titanium implant, substantially harder than human bone, absorbs most of the chewing forces. Consequently, the surrounding bone receives insufficient stimulation, potentially leading to weakening or resorption over time.
To address these limitations, the research team developed a novel β-type titanium alloy implant (Ti-Nb-Zr, TNZ) by incorporating niobium (Nb) and zirconium (Zr). They then conducted a comprehensive evaluation of both its material properties and clinical performance.
The TNZ alloy used in this study combines titanium with approximately 40% niobium and 7% zirconium.
The research was conducted in two phases. Initially, the implant surface was analyzed using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS), confirming a uniform distribution of alloy components across the surface.
Subsequent strength testing revealed that the TNZ alloy’s tensile strength averaged 1139 MPa, approximately 27% higher than existing implant materials.
Interestingly, the elastic modulus, which indicates the metal’s flexibility, measured 75 GPa – lower than traditional titanium and more closely resembling the properties of human bone.
The TNZ implant also demonstrated superior fatigue resistance. Fatigue life tests showed it could withstand an average of about 1.06 million cycles of repetitive loading, four times longer than conventional titanium implants.
The team conducted clinical trials involving 80 adult patients at Hallym University Sacred Heart Hospital and Bundang Seoul National University Hospital.
Patients were randomly assigned either the TNZ implant or a traditional titanium implant, with follow-up evaluations at 6 and 12 months post-surgery.
The results were impressive: both groups achieved a 100% success rate and survival rate for the implants. No significant differences were observed in gum health or the stability of the surrounding bone between the two groups.
X-ray analysis of the microstructural changes in the bone around the implants revealed that bone stability remained within normal ranges for all patients.
Notably, no side effects or adverse reactions were reported, confirming the safety and biocompatibility of the TNZ alloy implants.
Professor Yang stated that they’ve validated the potential of this next-generation implant material, which offers superior strength to traditional titanium while more closely mimicking the physical properties of bone.
He added that this could provide a valuable new treatment option in challenging clinical scenarios, such as for patients with bruxism or those requiring narrow implants due to limited jaw width.
Looking ahead, the research team plans to further validate the clinical advantages of the TNZ alloy implant through long-term follow-up studies and multi-center clinical trials.