Novel Osteogenic Ti-6Al-4V Device For Restoration Of Dental Function In Patients With Large Bone Deficiencies: Design, Development And Implementation

D J Cohen, A Cheng, A Kahn, M Aviram, A J Whitehead, S L Hyzy, R M Clohessy, B D Boyan, Z Schwartz

Full text link : https://pubmed.ncbi.nlm.nih.gov/26854193/

Novel Osteogenic Ti-6Al-4V Device for Restoration of Dental Function in Patients with Large Bone Deficiencies: Design, Development and Implementation

1. Scientific Reference

• Study Title: Novel Osteogenic Ti-6Al-4V Device for Restoration of Dental Function in Patients with Large Bone Deficiencies: Design, Development and Implementation
• Authors: D. J. Cohen, A. Cheng, A. Kahn, M. Aviram, A. J. Whitehead, S. L. Hyzy, R. M. Clohessy, B. D. Boyan, Z. Schwartz
• Journal: Scientific Reports
• Year of Publication: 2016
• DOI: 10.1038/srep20493

2. Scientific Background

Management of severely resorbed edentulous jaws remains one of the most demanding challenges in implant dentistry and oral reconstruction. Conventional endosseous implants require adequate bone volume for primary stability, yet many patients with advanced mandibular atrophy lack sufficient residual bone to support traditional implant placement.

Current treatment strategies often involve bone grafting procedures, guided bone regeneration techniques, or staged surgical approaches aimed at rebuilding lost alveolar bone before implant rehabilitation. While effective in selected cases, these protocols may increase treatment complexity, morbidity, cost, and overall treatment duration.

Advances in digital planning, computed tomography, CAD/CAM technologies, and additive manufacturing have created opportunities for highly individualized implant solutions. The present study explores whether a patient-specific titanium alloy device, manufactured through 3D printing and enhanced with osteogenic surface modifications, could promote bone formation and osseointegration in situations where conventional implant therapy may be difficult or impossible.

3. Study Objective

The primary objective of this investigation was to develop and evaluate a customized subperiosteal titanium alloy device capable of stimulating bone regeneration and achieving stable osseointegration in patients with severe mandibular bone deficiencies.

The authors sought to determine whether a laser-sintered Ti-6Al-4V construct with micro- and nano-scale surface modifications could enhance osteogenic activity, support new bone formation, and ultimately provide a stable foundation for dental rehabilitation.

4. Methodology

This translational study combined in vitro experimentation, preclinical animal research, and preliminary human clinical application.

Ti-6Al-4V devices were produced using additive manufacturing technology based on computerized design workflows. Following fabrication, the surfaces underwent grit blasting and acid etching to generate hierarchical micro- and nano-scale topography.

The biological response of normal human osteoblasts was assessed on smooth and roughened titanium surfaces. Osseointegration and bone formation were subsequently evaluated in rat calvarial models and rabbit tibial models using micro-computed tomography, histological analysis, and biomechanical testing.

The clinical phase involved two edentulous patients who received patient-specific implants designed from CT-based mandibular reconstructions. Follow-up imaging was performed to assess osseointegration and implant stability.

5. Main Results

The modified titanium surfaces demonstrated enhanced osteogenic behavior compared with smoother control surfaces. Human osteoblasts cultured on micro- and nano-textured surfaces produced higher levels of osteogenic and angiogenic markers, including osteocalcin, BMP-2, and VEGF.

In animal models, porous implants supported progressive bone ingrowth and increasing bone-to-implant contact over time. The addition of demineralized bone matrix (DBX) further improved several measures of bone formation and mechanical integration. Biomechanical pull-out testing showed stronger implant fixation when surface modification was combined with DBX treatment.

Rabbit tibia experiments demonstrated progressive osseointegration, with substantial bone formation observed both within and around the custom wrap implants.

In the two clinical cases presented, radiographic evaluations at three and eight months showed evidence of new bone formation and successful integration of the customized devices. The implants remained functional during the reported observation period, and no complications were described.

6. Clinical Analysis

This study represents an important step toward the development of personalized implant solutions for patients with extensive jawbone deficiencies. Rather than relying solely on mechanical fixation, the proposed device was designed to actively encourage biological integration through a combination of customized geometry and osteogenic surface engineering.

A key finding is that surface characteristics appear to play a significant role in regulating cellular activity and subsequent bone formation. The results suggest that micro- and nano-scale surface modifications can influence osteoblast behavior and may contribute to improved osseointegration.

From a clinical perspective, the concept is particularly relevant for patients with advanced mandibular atrophy who may not be ideal candidates for conventional implant placement. The ability to fabricate patient-specific devices directly from CT imaging introduces a precision-medicine approach that could potentially reduce the need for extensive reconstructive procedures in selected cases.

However, caution is warranted when interpreting the clinical implications. Human data are limited to two cases with relatively short follow-up. The study does not provide sufficient evidence to determine long-term implant survival, biological complications, prosthetic outcomes, or comparative effectiveness against established reconstructive techniques.

Therefore, the findings should be viewed primarily as proof-of-concept evidence supporting further clinical investigation.

7. Clinical Applications

The findings may be relevant in several challenging clinical scenarios, including:

• Severe mandibular bone atrophy.
• Complex implant rehabilitation in edentulous patients.
• Cases where conventional endosseous implant placement is not feasible.
• Digitally planned implant reconstruction using CT-based workflows.
• CAD/CAM and additive manufacturing applications in oral surgery.
• Patient-specific reconstruction of compromised alveolar ridges.
• Advanced implant-supported prosthetic rehabilitation.

The study also highlights the potential role of customized titanium devices in broader maxillofacial reconstruction settings where conventional treatment options may be limited.

8. Level of Evidence, Limitations, and Transparency

This publication should be considered a translational preclinical investigation supported by limited clinical case experience. Consequently, the level of clinical evidence remains relatively low.

Several limitations should be acknowledged:

• Only two human clinical cases were reported.
• No clinical control group was included.
• Follow-up was limited to the period described in the article.
• Long-term implant survival data were not available.
• Direct comparisons with alternative reconstructive approaches were not performed.

The information provided does not identify any specific conflicts of interest requiring special consideration. The authors are affiliated with academic institutions, research centers, and clinical organizations involved in biomedical engineering, dentistry, and oral surgery.

9. Key Study Points

• Study Type: Translational preclinical study with clinical case reports.
• Level of Evidence: Low to moderate clinical evidence.
• Population Studied: In vitro human osteoblast experiments, rat and rabbit animal models, and two human patients.
• Number of Patients: Two clinical cases.
• Follow-up Duration: Up to eight months in the reported clinical cases.
• Primary Outcome: Bone regeneration and osseointegration of customized Ti-6Al-4V implants.
• Main Finding: Surface-modified additively manufactured implants promoted osteogenic activity and demonstrated successful integration in experimental and clinical settings.
• Scientific Conclusion: Customized titanium devices with micro- and nano-scale surface modifications show promise for supporting bone regeneration and implant rehabilitation in patients with severe bone deficiencies.
• Limitations: Small clinical sample size and absence of long-term clinical data.

10. Scientific Impact

This study occupies an important position within the evolution of digital implantology and personalized maxillofacial reconstruction. By combining CT-based planning, additive manufacturing, and biologically optimized implant surfaces, the authors introduced a comprehensive workflow that extends beyond traditional implant design concepts.

Its scientific value lies not only in demonstrating the feasibility of manufacturing patient-specific devices but also in providing evidence that surface engineering may influence biological integration. The stepwise progression from cellular investigations to animal validation and preliminary clinical implementation strengthens the translational relevance of the work.

Although clinical evidence remains limited, the study contributes to the growing body of research supporting personalized implant solutions for patients with severe anatomical deficiencies. It also provides a foundation for future investigations exploring additive manufacturing, regenerative implant design, and advanced reconstruction strategies in implant dentistry and oral surgery.

11. Editorial Conclusion

This study presents an innovative approach to implant rehabilitation by integrating additive manufacturing, patient-specific design, and osteogenic surface modification into a single treatment concept. The experimental and early clinical findings suggest that customized Ti-6Al-4V devices may facilitate bone regeneration and osseointegration in patients with severe bone loss. While the results are encouraging, the limited number of clinical cases and relatively short follow-up period require cautious interpretation. Larger prospective clinical studies will be necessary to determine the long-term predictability and clinical value of this technology in implant dentistry and oral reconstruction.