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Angrisani N, von der Ahe C, Willumeit-Römer R, Windhagen H, Scheper V, Schwarze M, Wiese B, Helmholz H, Reifenrath J. Treatment of osteoarthritis by implantation of Mg- and WE43-cylinders - A preclinical study on bone and cartilage changes and their influence on pain sensation in rabbits. Bioact Mater 2024; 40:366-377. [PMID: 38978802 PMCID: PMC11228885 DOI: 10.1016/j.bioactmat.2024.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 04/20/2024] [Accepted: 06/01/2024] [Indexed: 07/10/2024] Open
Abstract
With its main features of cartilage degeneration, subchondral bone sclerosis and osteophyte formation, osteoarthritis represents a multifactorial disease with no effective treatment options. As biomechanical shift in the trabecular network may be a driver for further cartilage degeneration, bone enhancement could possibly delay OA progression. Magnesium is known to be osteoconductive and already showed positive effects in OA models. We aimed to use magnesium cylinders to enhance subchondral bone quality, condition of cartilage and pain sensation compared to sole drilling in vivo. After eight weeks of implantation in rabbits, significant increase in subchondral bone volume and trabecular thickness with constant bone mineral density was found indicating favored biomechanics. As representative for pain, a higher number of CD271+ vessels were present in control samples without magnesium. However, this result could not be confirmed by sensitive, objective lameness evaluation using a pressure sensing mat and no positive effect could be shown on either cartilage degeneration evaluated by OARSI score nor the presence of regenerative cells in CD271-stained samples. The presented results show a relevant impact of implanted magnesium on key structures in OA pain with missing clinical relevance regarding pain. Further studies with shifted focus should examine additional structures as joint capsule or osteophytes.
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Affiliation(s)
- Nina Angrisani
- Hannover Medical School, Clinic for Orthopaedic Surgery, Lower Saxony Centre for Biomedical Engineering, Implant Research and Development (NIFE), Hannover, Lower Saxony, Germany
| | - Christin von der Ahe
- Hannover Medical School, Clinic for Orthopaedic Surgery, Lower Saxony Centre for Biomedical Engineering, Implant Research and Development (NIFE), Hannover, Lower Saxony, Germany
| | | | - Henning Windhagen
- Hannover Medical School, Clinic for Orthopaedic Surgery, Lower Saxony Centre for Biomedical Engineering, Implant Research and Development (NIFE), Hannover, Lower Saxony, Germany
| | - Verena Scheper
- Hannover Medical School, Department of Otolaryngology, Lower Saxony Centre for Biomedical Engineering, Implant Research and Development (NIFE), Hannover, Lower Saxony, Germany
| | - Michael Schwarze
- Hannover Medical School, Clinic for Orthopaedic Surgery, Laboratory for Biomechanics and Biomaterials, Hannover, Lower Saxony, Germany
| | - Björn Wiese
- Helmholtz-Zentrum Hereon, Institute of Metallic Biomaterials, Geesthacht, Germany
| | - Heike Helmholz
- Helmholtz-Zentrum Hereon, Institute of Metallic Biomaterials, Geesthacht, Germany
| | - Janin Reifenrath
- Hannover Medical School, Clinic for Orthopaedic Surgery, Lower Saxony Centre for Biomedical Engineering, Implant Research and Development (NIFE), Hannover, Lower Saxony, Germany
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Chen L, Han J, Guo C. Research status and prospects of biodegradable magnesium-based metal guided bone regeneration membranes. HUA XI KOU QIANG YI XUE ZA ZHI = HUAXI KOUQIANG YIXUE ZAZHI = WEST CHINA JOURNAL OF STOMATOLOGY 2024; 42:415-425. [PMID: 39049628 PMCID: PMC11338478 DOI: 10.7518/hxkq.2024.2024140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Revised: 05/16/2024] [Indexed: 07/27/2024]
Abstract
Biodegradable magnesium-based metal guided bone regeneration (GBR) membranes possess excellent mechanical properties, biodegradability, and osteopromotive capabilities, making them ideal implants for the treatment of maxillofacial bone defects. This review summarizes the current status and future research trends related to magnesium-based GBR membranes. First, the research history and application fields of magnesium-based metals are introduced, and the advantages of the use of magnesium-based materials for GBR membranes, including their mechanical properties, biocompatibility, osteopromotive performance, and underlying mechanisms are discussed. Finally, this review addresses the current limitations of magnesium-based GBR membranes and their applications and prospects in the field of dentistry. In conclusion, considerable advancements have been in fundamental and translational research on magnesium-based GBR membranes, which lays a crucial foundation for the treatment of maxillofacial bone defects.
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Affiliation(s)
- Liangwei Chen
- Dept. of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing 100081, China
- National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing 100081, China
| | - Jianmin Han
- National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing 100081, China
- Dept. of Key Laboratory, Peking University School and Hospital of Stomatology, Beijing 100081, China
| | - Chuanbin Guo
- Dept. of Oral and Maxillofacial Surgery, Peking University School and Hospital of Stomatology, Beijing 100081, China
- National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing 100081, China
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Willbold E, Kalla K, Janning C, Bartsch I, Bobe K, Brauneis M, Haupt M, Reebmann M, Schwarze M, Remennik S, Shechtman D, Nellesen J, Tillmann W, Witte F. Dissolving magnesium hydroxide implants enhance mainly cancellous bone formation whereas degrading RS66 implants lead to prominent periosteal bone formation in rabbits. Acta Biomater 2024:S1742-7061(24)00407-0. [PMID: 39053818 DOI: 10.1016/j.actbio.2024.07.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 06/20/2024] [Accepted: 07/18/2024] [Indexed: 07/27/2024]
Abstract
Bone fractures often require internal fixation using plates or screws. Normally, these devices are made of permanent metals like titanium providing necessary strength and biocompatibility. However, they can also cause long-term complications and may require removal. An interesting alternative are biocompatible degradable devices, which provide sufficient initial strength and then degrade gradually. Among other materials, biodegradable magnesium alloys have been developed for craniofacial and orthopaedic applications. Previously, we tested implants made of magnesium hydroxide and RS66, a strong and ductile ZK60-based alloy, with respect to biocompatibility and degradation behaviour. Here, we compare the effects of dissolving magnesium hydroxide and RS66 cylinders on bone regeneration and bone growth in rabbit condyles using microtomographical and histological analysis. Both magnesium hydroxide and RS66 induced a considerable osteoblastic activity leading to distinct but different spatio-temporal patterns of cancellous and periosteal bone growth. Dissolving RS66 implants induced a prominent periosteal bone formation on the medial surface of the original condyle whereas dissolving magnesium hydroxide implants enhance mainly cancellous bone formation. Especially periosteal bone formation was completed after 6 and 8 weeks, respectively. The observed bone promoting functions are in line with previous reports of magnesium stimulating cancellous and periosteal bone growth and possible underlying signalling mechanisms are discussed. STATEMENT OF SIGNIFICANCE: Biodegradable magnesium based implants are promising candidates for use in orthopedic and traumatic surgery. Although these implants are in the scientific focus for a long time, comparatively little is known about the interactions between degrading magnesium and the biological environment. In this work, we investigated the effects of two degrading cylindrical magnesium implants (MgOH2 and RS66) both on bone regeneration and on bone growth. Both MgOH2 and RS66 induce remarkable osteoblastic activities, however with different spatio-temporal patterns regarding cancellous and periosteal bone growth. We hypothesize that degradation products do not diffuse directionless away, but are transported by the restored blood flow in specific spatial patterns which is also dependent on the used surgical technique.
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Affiliation(s)
- Elmar Willbold
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany.
| | - Katharina Kalla
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany
| | - Carla Janning
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany
| | - Ivonne Bartsch
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany
| | - Katharina Bobe
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany
| | - Maria Brauneis
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany
| | - Maike Haupt
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany
| | - Mattias Reebmann
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany
| | - Michael Schwarze
- Laboratory for Biomechanics and Biomaterials, Department of Orthopaedic Surgery, Hannover Medical School, Anna-von-Borries-Straße 1-7, 30625 Hannover, Germany
| | - Sergei Remennik
- The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel
| | - Dan Shechtman
- Department of Materials Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Jens Nellesen
- Institute of Materials Engineering, Technische Universität Dortmund, Leonhard-Euler-Straße 2, 44227 Dortmund, Germany
| | - Wolfgang Tillmann
- Institute of Materials Engineering, Technische Universität Dortmund, Leonhard-Euler-Straße 2, 44227 Dortmund, Germany
| | - Frank Witte
- Charité - Universitätsmedizin Berlin, Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Aßmannshauser Straße 4-6, 14197, Berlin, Germany
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Ma C, An H, Kim YK, Kim SY, Jang YS, Lee MH. Polycaprolactone-MXene coating for controlling initial biodegradation of magnesium implant via near-infrared light. RSC Adv 2024; 14:19718-19725. [PMID: 38899034 PMCID: PMC11185355 DOI: 10.1039/d4ra00799a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 05/20/2024] [Indexed: 06/21/2024] Open
Abstract
The mechanical strength of magnesium implants undergoes a rapid decline after implantation due to bioabsorption, which can lead to the risk of rupture. To ensure sustained mechanical strength and initiate bioabsorption selectively upon specific external stimuli until the bone regains sufficient support, we developed a biosafe near-infrared light (NIR)-sensitive polymer coating using polycaprolactone (PCL) and Ti3C2 (MXenes). The synthetic MXene powders were characterized using SEM, EDS, and XRD, and the amount of MXenes had a proliferation-promoting effect on MC3T3-E1, as observed through cell assays. The PCL-MXene coating was successfully prepared on the magnesium surface using the casting coating method, and it can protect the magnesium surface for up to 28 days by decreasing the corrosion ratio. However, the coating can be easily degraded after exposure to NIR light for 20 minutes to expose the magnesium substrate, especially in a liquid environment. Meanwhile, the magnesium implant with the PCL-MXene coating has no cytotoxicity toward MC3T3-E1. These findings can provide a new solution for the development of controlled degradation implants.
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Affiliation(s)
- Chen Ma
- Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University Jeon-Ju 54896 Republic of Korea
- School of Stomatology, Shandong First Medical University Jinan 250117 Shandong China
| | - Hao An
- Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University Jeon-Ju 54896 Republic of Korea
| | - Yu-Kyoung Kim
- Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University Jeon-Ju 54896 Republic of Korea
| | - Seo-Young Kim
- Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University Jeon-Ju 54896 Republic of Korea
| | - Yong-Seok Jang
- Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University Jeon-Ju 54896 Republic of Korea
| | - Min-Ho Lee
- Department of Dental Biomaterials, Institute of Biodegradable Materials, School of Dentistry, Jeonbuk National University Jeon-Ju 54896 Republic of Korea
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Menze R, Hesse B, Kusmierczuk M, Chen D, Weitkamp T, Bettink S, Scheller B. Synchrotron microtomography reveals insights into the degradation kinetics of bio-degradable coronary magnesium scaffolds. Bioact Mater 2024; 32:1-11. [PMID: 37771679 PMCID: PMC10522944 DOI: 10.1016/j.bioactmat.2023.09.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 08/18/2023] [Accepted: 09/12/2023] [Indexed: 09/30/2023] Open
Abstract
Bioresorbable magnesium scaffolds are a promising future treatment option for coronary artery stenosis, especially for young adults. Due to the degradation of these scaffolds (<1 year), long-term device-related clinical events could be reduced compared to treatments with conventional drug eluting stents. First clinical trials indicate a return of vasomotion after one year, which may be associated with improved long-term clinical outcomes. However, even after decades of development, the degradation process, ideal degradation time and biological response in vivo are still not fully understood. The present study investigates the in vivo degradation of magnesium scaffolds in the coronary arteries of pigs influenced by different strut thicknesses and the presence of antiproliferative drugs. Due to high 3D image contrast of synchrotron-based micro-CT with phase contrast (SR-μCT), a qualitative and quantitative evaluation of the degradation morphology of magnesium scaffolds was obtained. For the segmentation of the μCT images a convolutional network architecture (U-net) was exploited, demonstrating the huge potential of merging high resolution SR-μCT with deep learning (DL) supported data analysis. In total, 30 scaffolds, made of the rare earth alloy Resoloy®, with different strut designs were implanted into the coronary arteries of 10 domestic pigs for 28 days using drug-coated or uncoated angioplasty balloons for post-dilatation. The degradation morphology was analyzed using scanning electron microscopy, energy dispersive x-ray spectroscopy and SR-μCT. The data from these methods were then related to data from angiography, optical coherence tomography and histology. A thinner strut size (95 vs. 130 μm) and the presence of paclitaxel indicated a slower degradation rate at 28 d in vivo, which positively influences the late lumen loss (0.5 and 0.6 mm vs. 1.0 and 1.1 mm) and recoil values (0 and 1.7% vs. 6.1 and 22%).
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Affiliation(s)
- Roman Menze
- MeKo Manufacturing e.K., Im Kirchenfelde 12-14, 31157, Sarstedt, Germany
| | - Bernhard Hesse
- Xploraytion GmbH, Bismarckstr. 10-12, 10625, Berlin, Germany
| | | | - Duote Chen
- Xploraytion GmbH, Bismarckstr. 10-12, 10625, Berlin, Germany
| | - Timm Weitkamp
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190, Saint-Aubin, France
| | | | - Bruno Scheller
- Universität des Saarlandes, Campus Homburg, 66421, Homburg, Germany
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Elad A, Pul L, Rider P, Rogge S, Witte F, Tadić D, Mijiritsky E, Kačarević ŽP, Steigmann L. Resorbable magnesium metal membrane for sinus lift procedures: a case series. BMC Oral Health 2023; 23:1006. [PMID: 38097992 PMCID: PMC10722874 DOI: 10.1186/s12903-023-03695-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Accepted: 11/22/2023] [Indexed: 12/17/2023] Open
Abstract
BACKGROUND The purpose of this case series was to demonstrate the use of a magnesium membrane for repairing the perforated membrane in both direct and indirect approaches, as well as its application in instances where there has been a tear of the Schneiderian membrane. CASE PRESENTATION The case series included four individual cases, each demonstrating the application of a magnesium membrane followed by bone augmentation using a mixture of xenograft and allograft material in the sinus cavity. In the first three cases, rupture of Schneiderian membrane occurred as a result of tooth extraction, positioning of the dental implant, or as a complication during the procedure. In the fourth case, Schneiderian membrane was perforated as a result of the need to aspirate a polyp in the maxillary sinus. In case one, 10 mm of newly formed bone is visible four months after graft placement. Other cases showed between 15 and 20 mm of newly formed alveolar bone. No residual magnesium membrane was seen on clinical inspection. The vertical and horizontal augmentations proved stable and the dental implants were placed in the previously grafted sites. CONCLUSION Within the limitations of this case series, postoperative clinical examination, and panoramic and CBCT images demonstrated that resorbable magnesium membrane is a viable material for sinus lift and Schneiderian membrane repair. The case series showed successful healing and formation of new alveolar bone with separation of the oral cavity and maxillary sinus in four patients.
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Affiliation(s)
| | - Luka Pul
- Department of Dental Medicine, Faculty of Dental Medicine and Health Osijek, J.J. Strossmayer University of Osijek, Crkvena 21, 31 000, Osijek, Croatia
| | | | - Svenja Rogge
- Botiss Biomaterials GmbH, 15806, Zossen, Germany
| | - Frank Witte
- Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, Aßmannshauser Straße, 4-6, 14197, Berlin, Germany
| | - Dražen Tadić
- Botiss Biomaterials GmbH, 15806, Zossen, Germany
| | - Eitan Mijiritsky
- Department of Head and Neck and Maxillofacial Surgery, Tel-Aviv Sourasky Medical Center, The Sackler Faculty of Medicine, Tel-Aviv University, 6139001, Tel Aviv, Israel
| | - Željka Perić Kačarević
- Botiss Biomaterials GmbH, 15806, Zossen, Germany.
- Department of Anatomy, Histology, Embryology, Pathology Anatomy and Pathology Histology, Faculty of Dental Medicine and Health Osijek, J.J. Strossmayer University of Osijek, Crkvena 21, 31 000, Osijek, Croatia.
| | - Larissa Steigmann
- Department of Oral Medicine, Infection, and Immunity, Division of Periodontology, Harvard School of Dental Medicine, Boston, MA, USA
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Zhao G, Wang S, Wang G, Zhang B, Huang H, Yao Y. Enhancing bone formation using absorbable AZ31B magnesium alloy membranes during distraction osteogenesis: A new material study. Heliyon 2023; 9:e18032. [PMID: 37534007 PMCID: PMC10391921 DOI: 10.1016/j.heliyon.2023.e18032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 06/24/2023] [Accepted: 07/05/2023] [Indexed: 08/04/2023] Open
Abstract
Purpose To investigate whether the use of absorble AZ31B magnesium alloys over distraction gaps improves the quality and quantity of regenerated bone better than the use of Collagen membranes. Methods Fifteen mixed-breed dogs were randomly divided into the experimental (n = 10) and control (n = 5) groups. In the experimental group, two devices were implanted along the mandible; one side with absorble AZ31B and the other side with Collagen. The control animals did not undergo osteotomy or distraction. After a consolidation time of two months, 30 specimens were harvested, and newly created bone was identified using CBCT and micro-CT. Results The Collagen membranes were absorbed completely, and the AZ31B membranes became irregular and rough. Mandible length was successfully extended approximately 1 cm. More bone formation was found after using AZ31B than Collagen, and there was a significant difference in width reduction between experimental sites treated with AZ31B (0.11 ± 0.04 cm) and Collagen (0.42 ± 0.06 cm) (p < 0.05). Trabecular thickness was also significantly higher in AZ31B (0.338 ± 0.08 cm) and control (0.417 ± 0.05 cm) than Collagen (0.178 ± 0.04 cm) (p < 0.05). Conclusion An AZ31B membrane barrier is biocompatible and absorbable which can maintain the distraction gap and provide support to the attached osteoprogenitors by providing space for them to proliferate.
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Affiliation(s)
- Guiran Zhao
- Department of Oral and Maxillofacial Surgery. First Affiliated Hospital of Jinzhou Medical University, Jinzhou City, Liaoning Province, China
| | - Shu Wang
- Second Affiliated Hospital of Jinzhou Medical University, Jinzhou City, Liaoning Province, China
| | - Guijun Wang
- First Affiliated Hospital of Jinzhou Medical University, Jinzhou City, Liaoning Province, China
| | - Bin Zhang
- First Affiliated Hospital of Jinzhou Medical University, Jinzhou City, Liaoning Province, China
| | - Han Huang
- First Affiliated Hospital of Jinzhou Medical University, Jinzhou City, Liaoning Province, China
| | - Yusheng Yao
- Third Affiliated Hospital of Jinzhou Medical University, No.2, Section5, Heping Road, Linghe District, Jinzhou City, Liaoning Province, China
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Blašković M, Blašković D, Hangyasi DB, Peloza OC, Tomas M, Čandrlić M, Rider P, Mang B, Kačarević ŽP, Trajkovski B. Evaluation between Biodegradable Magnesium Metal GBR Membrane and Bovine Graft with or without Hyaluronate. MEMBRANES 2023; 13:691. [PMID: 37623752 PMCID: PMC10456676 DOI: 10.3390/membranes13080691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Revised: 07/12/2023] [Accepted: 07/24/2023] [Indexed: 08/26/2023]
Abstract
Bone substitutes and barrier membranes are widely used in dental regeneration procedures. New materials are constantly being developed to provide the most optimal surgical outcomes. One of these developments is the addition of hyaluronate (HA) to the bovine bone graft, which has beneficial wound healing and handling properties. However, an acidic environment that is potentially produced by the HA is known to increase the degradation of magnesium metal. The aim of this study was to evaluate the potential risk for the addition of HA to the bovine bone graft on the degradation rate and hence the efficacy of a new biodegradable magnesium metal GBR membrane. pH and conductivity measurements were made in vitro for samples placed in phosphate-buffered solutions. These in vitro tests showed that the combination of the bovine graft with HA resulted in an alkaline environment for the concentrations that were used. The combination was also tested in a clinical setting. The use of the magnesium metal membrane in combination with the tested grafting materials achieved successful treatment in these patients and no adverse effects were observed in vivo for regenerative treatments with or without HA. Magnesium based biodegradable GBR membranes can be safely used in combination with bovine graft with or without hyaluronate.
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Affiliation(s)
- Marko Blašković
- Department of Oral Surgery, Faculty of Dental Medicine Rijeka, University of Rijeka, Krešimirova 40/42, 51000 Rijeka, Croatia;
- Dental Clinic Dr. Blašković, Linićeva ulica 16, 51000 Rijeka, Croatia;
| | - Dorotea Blašković
- Dental Clinic Dr. Blašković, Linićeva ulica 16, 51000 Rijeka, Croatia;
| | | | - Olga Cvijanović Peloza
- Department of Anatomy, Faculty of Medicine, University of Rijeka, Braće Branchetta 20/1, 51000 Rijeka, Croatia;
| | - Matej Tomas
- Department of Dental Medicine, Faculty of Dental Medicine and Health Osijek, Josip Juraj Strossmayer University of Osijek, Crkvena 21, 31000 Osijek, Croatia; (M.T.); (M.Č.)
| | - Marija Čandrlić
- Department of Dental Medicine, Faculty of Dental Medicine and Health Osijek, Josip Juraj Strossmayer University of Osijek, Crkvena 21, 31000 Osijek, Croatia; (M.T.); (M.Č.)
| | - Patrick Rider
- Botiss Biomaterials, Ullsteinstrasse 108, 12109 Berlin, Germany; (P.R.); (B.M.)
| | - Berit Mang
- Botiss Biomaterials, Ullsteinstrasse 108, 12109 Berlin, Germany; (P.R.); (B.M.)
| | - Željka Perić Kačarević
- Department of Anatomy, Embriology, Pathology and Pathohistology, Faculty of Dental Medicine and Health Osijek, Josip Juraj Strossmayer University of Osijek, Crkvena 21, 31000 Osijek, Croatia
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Tomic J, Wiederstein-Grasser I, Schanbacher M, Weinberg AM. Newly Developed Resorbable Magnesium Biomaterials for Orbital Floor Reconstruction in Caprine and Ovine Animal Models-A Prototype Design and Proof-of-Principle Study. J Funct Biomater 2023; 14:339. [PMID: 37504834 PMCID: PMC10381438 DOI: 10.3390/jfb14070339] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/12/2023] [Accepted: 06/21/2023] [Indexed: 07/29/2023] Open
Abstract
BACKGROUND orbital floor fractures have not been reconstructed using magnesium biomaterials. METHODS To test technical feasibility, ex vivo caprine and ovine heads (n = 5) were used. Head tissues were harvested from pubescent animals (n = 5; mean age: 3.2 years; mean mass: 26.3 kg) and stored below 11 degrees for 7-10 days. All procedures were performed in a university animal resource facility. Two experienced maxillofacial surgeons performed orbital floor procedures in both orbits of all animals in a step-by-step preplanned dissection. A transconjunctival approach was chosen to repair the orbital floor with three different implants (i.e., magnesium implants; titanium mesh; and polydioxanone or PDO sheets). The position of each implant was evaluated by Cone-beam computed tomography (CBCT). RESULTS Axial, coronal, and sagittal plane images showed good positioning of the magnesium plates. The magnesium plates had a radiographic visibility similar to that of the PDO sheets but lower than that of the titanium mesh. CONCLUSIONS The prototype design study showed a novel indication for magnesium biomaterials. Further testing of this new biomaterial may lead to the first resorbable biomaterial with good mechanical properties for extensive orbital wall defects.
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Affiliation(s)
- Josip Tomic
- Department of Oral and Maxillofacial Surgery, Medical University of Graz, 8036 Graz, Austria
| | - Iris Wiederstein-Grasser
- Core Facility Experimental Biomodels, Division of Biomedical Research, Medical University of Graz, 8036 Graz, Austria
| | - Monika Schanbacher
- Department of Oral and Maxillofacial Surgery, Medical University of Graz, 8036 Graz, Austria
| | - Annelie Martina Weinberg
- Department of Orthopaedics and Trauma, Medical University of Graz, Auenbruggerplatz 5, 8036 Graz, Austria
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10
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Li Q, He W, Li W, Luo S, Zhou M, Wu D, Li Y, Wu S. Band-Aid-Like Self-Fixed Barrier Membranes Enable Superior Bone Augmentation. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2206981. [PMID: 37029705 PMCID: PMC10238180 DOI: 10.1002/advs.202206981] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 02/10/2023] [Indexed: 06/04/2023]
Abstract
In guided bone regeneration surgery, a barrier membrane is usually used to inhibit soft tissue from interfering with osteogenesis. However, current barrier membranes usually fail to resist the impact of external forces on bone-augmented region, thus causing severe displacement of membranes and their underlying bone graft materials, eventually leading to unsatisfied bone augmentation. Herein, a new class of local double-layered adhesive barrier membranes (ABMs) is developed to successfully immobilize bone graft materials. The air-dried adhesive hydrogel layers with suction-adhesion properties enable ABMs to firmly adhere to the wet bone surface through a "stick-and-use" band-aid-like strategy and effectively prevent the displacement of membranes and the leakage of bone grafts in uncontained bone defect treatment. Furthermore, the strategy is versatile for preparing diverse adhesive barrier membranes and immobilizing different bone graft materials for various surgical regions. By establishing such a continuous barrier for the bone graft material, this strategy may open a novel avenue for designing the next-generation barrier membranes.
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Affiliation(s)
- Qianqian Li
- Hospital of StomatologyGuanghua School of StomatologyGuangdong Provincial Key Laboratory of StomatologySun Yat‐sen UniversityGuangzhou510055P. R. China
| | - Wenyi He
- PCFM LabSchool of ChemistrySun Yat‐sen UniversityGuangzhou510006P. R. China
| | - Weiran Li
- Hospital of StomatologyGuanghua School of StomatologyGuangdong Provincial Key Laboratory of StomatologySun Yat‐sen UniversityGuangzhou510055P. R. China
| | - Shulu Luo
- Hospital of StomatologyGuanghua School of StomatologyGuangdong Provincial Key Laboratory of StomatologySun Yat‐sen UniversityGuangzhou510055P. R. China
| | - Minghong Zhou
- Medical Research InstituteGuangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences)Southern Medical UniversityGuangzhou510080P. R. China
| | - Dingcai Wu
- PCFM LabSchool of ChemistrySun Yat‐sen UniversityGuangzhou510006P. R. China
| | - Yan Li
- Hospital of StomatologyGuanghua School of StomatologyGuangdong Provincial Key Laboratory of StomatologySun Yat‐sen UniversityGuangzhou510055P. R. China
| | - Shuyi Wu
- Hospital of StomatologyGuanghua School of StomatologyGuangdong Provincial Key Laboratory of StomatologySun Yat‐sen UniversityGuangzhou510055P. R. China
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11
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Blašković M, Butorac Prpić I, Blašković D, Rider P, Tomas M, Čandrlić S, Botond Hangyasi D, Čandrlić M, Perić Kačarević Ž. Guided Bone Regeneration Using a Novel Magnesium Membrane: A Literature Review and a Report of Two Cases in Humans. J Funct Biomater 2023; 14:307. [PMID: 37367271 DOI: 10.3390/jfb14060307] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2023] [Revised: 05/29/2023] [Accepted: 05/30/2023] [Indexed: 06/28/2023] Open
Abstract
Guided bone regeneration (GBR) is a common procedure used to rebuild dimensional changes in the alveolar ridge that occur after extraction. In GBR, membranes are used to separate the bone defect from the underlying soft tissue. To overcome the shortcomings of commonly used membranes in GBR, a new resorbable magnesium membrane has been developed. A literature search was performed via MEDLINE, Scopus, Web of Science and PubMed in February 2023 for research on magnesium barrier membranes. Of the 78 records reviewed, 16 studies met the inclusion criteria and were analyzed. In addition, this paper reports two cases where GBR was performed using a magnesium membrane and magnesium fixation system with immediate and delayed implant placement. No adverse reactions to the biomaterials were detected, and the membrane was completely resorbed after healing. The resorbable fixation screws used in both cases held the membranes in place during bone formation and were completely resorbed. Therefore, the pure magnesium membrane and magnesium fixation screws were found to be excellent biomaterials for GBR, which supports the findings of the literature review.
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Affiliation(s)
- Marko Blašković
- Department of Oral Surgery, Faculty of Dental Medicine Rijeka, University of Rijeka, Krešimirova 40/42, 51 000 Rijeka, Croatia
- Dental Clinic Blašković, Linićeva ulica 16, 51 000 Rijeka, Croatia
| | - Ivana Butorac Prpić
- Department of Dental Medicine, Faculty of Dental Medicine and Health Osijek, J.J. Strossmayer University of Osijek, Crkvena 21, 31 000 Osijek, Croatia
| | | | | | - Matej Tomas
- Department of Dental Medicine, Faculty of Dental Medicine and Health Osijek, J.J. Strossmayer University of Osijek, Crkvena 21, 31 000 Osijek, Croatia
| | - Slavko Čandrlić
- Department of Interdisciplinary Areas, Faculty of Dental Medicine and Health Osijek, J.J. Strossmayer University of Osijek, Crkvena 21, 31 000 Osijek, Croatia
| | - David Botond Hangyasi
- Department of Periodontology, Faculty of Dentistry, University of Szeged, Tisza Lajos krt. 64-66, H-6720 Szeged, Hungary
| | - Marija Čandrlić
- Department of Dental Medicine, Faculty of Dental Medicine and Health Osijek, J.J. Strossmayer University of Osijek, Crkvena 21, 31 000 Osijek, Croatia
| | - Željka Perić Kačarević
- Botiss Biomaterials GmbH, 15806 Zossen, Germany
- Department of Anatomy, Histology, Embriology, Pathology Anatomy and Pathology Histology, Faculty of Dental Medicine and Health Osijek, J.J. Strossmayer University of Osijek, Crkvena 21, 31 000 Osijek, Croatia
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12
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Application of Biodegradable Magnesium Membrane Shield Technique for Immediate Dentoalveolar Bone Regeneration. Biomedicines 2023; 11:biomedicines11030744. [PMID: 36979728 PMCID: PMC10045016 DOI: 10.3390/biomedicines11030744] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 02/20/2023] [Accepted: 02/22/2023] [Indexed: 03/06/2023] Open
Abstract
For the first time, the clinical application of the first CE registered magnesium membrane is reported. Due to the material characteristics of magnesium metal, new treatment methodologies become possible. This has led to the development of a new technique: the magnesium membrane shield technique, used to rebuild the buccal or palatal walls of compromised extraction sockets. Four clinical cases are reported, demonstrating the handling options of this new technique for providing a successful regenerative outcome. Using the technique, immediate implant placement is possible with a provisional implant in the aesthetic zone. It can also be used for rebuilding both the buccal and palatal walls simultaneously. For instances where additional mechanical support is required, the membrane can be bent into a double layer, which additionally provides a rounder edge for interfacing with the soft tissue. In all reported clinical cases, there was a good bone tissue regeneration and soft tissue healing. In some instances, the new bone had formed a thick cortical bone visible in cone beam computed tomography (CBCT) radiographs of the regenerated sites, which is known to be remodeled in the post treatment period. Overall, the magnesium membrane shield technique is presented as an alternative treatment option for compromised extraction sockets.
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13
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Degradable Pure Magnesium Used as a Barrier Film for Oral Bone Regeneration. J Funct Biomater 2022; 13:jfb13040298. [PMID: 36547558 PMCID: PMC9781112 DOI: 10.3390/jfb13040298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 12/08/2022] [Accepted: 12/09/2022] [Indexed: 12/23/2022] Open
Abstract
The barrier membrane plays an extremely critical role in guided bone regeneration (GBR), which determines the success or failure of GBR technology. In order to obtain barrier membranes with high mechanical strength and degradability, some researchers have focused on degradable magnesium alloys. However, the degradation rate of pure Mg-based materials in body fluids is rather fast, thus posing an urgent problem to be solved in oral clinics. In this study, a novel micro-arc oxidation (MAO) surface-treated pure Mg membrane was prepared. Electrochemical tests, immersion experiments and in vivo experiments were carried out to investigate its potential use as a barrier membrane. The experimental results showed that the corrosion resistance of a pure Mg membrane treated by MAO is better than that of the uncoated pure Mg. The results of cell experiments showed no obvious cytotoxicity, which suggests the enhanced differentiation of osteoblasts. At the same time, the MAO-Mg membrane showed better biological activity than the pure Ti membrane in the early stage of implantation, exhibiting relatively good bone regeneration ability. Consequently, the MAO membrane has been proven to possess good application prospects for guided bone regeneration.
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14
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Gambaro S, Nascimento ML, Shekargoftar M, Ravanbakhsh S, Sales V, Paternoster C, Bartosch M, Witte F, Mantovani D. Characterization of a Magnesium Fluoride Conversion Coating on Mg-2Y-1Mn-1Zn Screws for Biomedical Applications. MATERIALS (BASEL, SWITZERLAND) 2022; 15:8245. [PMID: 36431729 PMCID: PMC9692750 DOI: 10.3390/ma15228245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Revised: 11/12/2022] [Accepted: 11/17/2022] [Indexed: 06/16/2023]
Abstract
MgF2-coated screws made of a Mg-2Y-1Mn-1Zn alloy, called NOVAMag® fixation screws (biotrics bioimplants AG), were tested in vitro for potential applications as biodegradable implants, and showed a controlled corrosion rate compared to non-coated screws. While previous studies regarding coated Mg-alloys have been carried out on flat sample surfaces, the present work focused on functional materials and final biomedical products. The substrates under study had a complex 3D geometry and a nearly cylindrical-shaped shaft. The corrosion rate of the samples was investigated using an electrochemical setup, especially adjusted to evaluate these types of samples, and thus, helped to improve an already patented coating process. A MgF2/MgO coating in the µm-range was characterized for the first time using complementary techniques. The coated screws revealed a smoother surface than the non-coated ones. Although the cross-section analysis revealed some fissures in the coating structure, the electrochemical studies using Hanks' salt solution demonstrated the effective role of MgF2 in retarding the alloy degradation during the initial stages of corrosion up to 24 h. The values of polarization resistance (Rp) of the coated samples extrapolated from the Nyquist plots were significantly higher than those of the non-coated samples, and impedance increased significantly over time. After 1200 s exposure, the Rp values were 1323 ± 144 Ω.cm2 for the coated samples and 1036 ± 198 Ω.cm2 for the non-coated samples, thus confirming a significant decrease in the degradation rate due to the MgF2 layer. The corrosion rates varied from 0.49 mm/y, at the beginning of the experiment, to 0.26 mm/y after 1200 s, and decreased further to 0.01 mm/y after 24 h. These results demonstrated the effectiveness of the applied MgF2 film in slowing down the corrosion of the bulk material, allowing the magnesium-alloy screws to be competitive as dental and orthopedic solutions for the biodegradable implants market.
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Affiliation(s)
- Sofia Gambaro
- National Research Council, Institute of Condensed Matter Chemistry and Technologies for Energy, CNR-ICMATE, 16149 Genoa, Italy
| | - M. Lucia Nascimento
- Biotrics Bioimplants AG, Ullsteinstrasse 108, 12109 Berlin, Germany
- Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité Universitätsmedizin Berlin, Aßmannshauser Straße 4–6, 14197 Berlin, Germany
| | - Masoud Shekargoftar
- Laboratory for Biomaterials and Bioengineering (CRC-I), Department of Min-Met-Materials Engineering and University Hospital Research Center, Regenerative Medicine, Laval University, Quebec City, QC G1V 0A6, Canada
| | - Samira Ravanbakhsh
- Laboratory for Biomaterials and Bioengineering (CRC-I), Department of Min-Met-Materials Engineering and University Hospital Research Center, Regenerative Medicine, Laval University, Quebec City, QC G1V 0A6, Canada
| | - Vinicius Sales
- Laboratory for Biomaterials and Bioengineering (CRC-I), Department of Min-Met-Materials Engineering and University Hospital Research Center, Regenerative Medicine, Laval University, Quebec City, QC G1V 0A6, Canada
| | - Carlo Paternoster
- Laboratory for Biomaterials and Bioengineering (CRC-I), Department of Min-Met-Materials Engineering and University Hospital Research Center, Regenerative Medicine, Laval University, Quebec City, QC G1V 0A6, Canada
| | - Marco Bartosch
- Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité Universitätsmedizin Berlin, Aßmannshauser Straße 4–6, 14197 Berlin, Germany
| | - Frank Witte
- Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité Universitätsmedizin Berlin, Aßmannshauser Straße 4–6, 14197 Berlin, Germany
| | - Diego Mantovani
- Laboratory for Biomaterials and Bioengineering (CRC-I), Department of Min-Met-Materials Engineering and University Hospital Research Center, Regenerative Medicine, Laval University, Quebec City, QC G1V 0A6, Canada
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15
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Systems, Properties, Surface Modification and Applications of Biodegradable Magnesium-Based Alloys: A Review. MATERIALS 2022; 15:ma15145031. [PMID: 35888498 PMCID: PMC9316815 DOI: 10.3390/ma15145031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 07/16/2022] [Accepted: 07/18/2022] [Indexed: 02/07/2023]
Abstract
In recent years, biodegradable magnesium (Mg) alloys have attracted the attention of many researchers due to their mechanical properties, excellent biocompatibility and unique biodegradability. Many Mg alloy implants have been successfully applied in clinical medicine, and they are considered to be promising biological materials. In this article, we review the latest research progress in biodegradable Mg alloys, including research on high-performance Mg alloys, bioactive coatings and actual or potential clinical applications of Mg alloys. Finally, we review the research and development direction of biodegradable Mg alloys. This article has a guiding significance for future development and application of high-performance biodegradable Mg alloys, promoting the future advancement of the magnesium alloy research field, especially in biomedicine.
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16
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Cho DH, Avey T, Nam KH, Dean D, Luo AA. In vitro and in vivo assessment of squeeze-cast Mg-Zn-Ca-Mn alloys for biomedical applications. Acta Biomater 2022; 150:442-455. [DOI: 10.1016/j.actbio.2022.07.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2022] [Revised: 07/20/2022] [Accepted: 07/25/2022] [Indexed: 11/30/2022]
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17
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Biodegradation of a Magnesium Alloy Fixation Screw Used in a Guided Bone Regeneration Model in Beagle Dogs. MATERIALS 2022; 15:ma15124111. [PMID: 35744169 PMCID: PMC9229971 DOI: 10.3390/ma15124111] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 06/03/2022] [Accepted: 06/08/2022] [Indexed: 02/06/2023]
Abstract
Nowadays, the most commonly used fixation systems are non-resorbable, but new resorbable magnesium alloy fixation screws have been introduced recently. Therefore, the aim of this study was to compare the magnesium fixation screw and the commonly used non-resorbable titanium screw in an animal model. Four 3-wall defect sites were covered with collagen membranes in the mandible of twenty beagle dogs (two sites on the left and two on the right). Each membrane was fixed with either four magnesium screws or four titanium screws. Post-operative follow-up revealed the expected observations such as transient inflammation and pain. Both groups showed a good healing response, with no differences between groups. Micro-CT analysis showed no significant difference between groups in terms of BV/TV or soft tissue volume. The void volume in the magnesium fixation screw group continued to decrease on average between the different timepoints, but not significantly. Furthermore, a gradual progression of the degradation process of the magnesium screws was observed in the same group. Magnesium screws and titanium screws showed equal performance in tissue regeneration according to GBR principles. An additional advantage of magnesium screws is their resorbable nature, which eliminates the need for a second surgical step to remove the screws.
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18
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Chen J, Dai J, Qian J, Li W, Li R, Pang D, Wan G, Li P, Xu S. Influence of Surface Roughness on Biodegradability and Cytocompatibility of High-Purity Magnesium. MATERIALS 2022; 15:ma15113991. [PMID: 35683285 PMCID: PMC9182346 DOI: 10.3390/ma15113991] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/25/2022] [Accepted: 05/29/2022] [Indexed: 11/16/2022]
Abstract
High-purity magnesium (Mg) is a promising biodegradable metal for oral and maxillofacial implants. Appropriate surface roughness plays a critical role in the degradation behavior and the related cellular processes of biodegradable Mg-based metals. Nevertheless, the most optimized surface roughness has been questionable, especially for Mg-based oral and maxillofacial implants. Three representative scales of surface roughness were investigated in this study, including smooth (Sa < 0.5 µm), moderately rough (Sa between 1.0−2.0 µm), and rough (Sa > 2.0 µm). The results indicated that the degradation rate of the Mg specimen in the cell culture medium was significantly accelerated with increased surface roughness. Furthermore, an extract test revealed that Mg with different roughness did not induce an evident cytotoxic effect. Nonetheless, the smooth Mg surface had an adversely affected cell attachment. Therefore, the high-purity Mg with a moderately rough surface exhibited the most optimized balance between biodegradability and overall cytocompatibility.
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Affiliation(s)
- Jiahao Chen
- Department of Oral Implantology, Stomatological Hospital, Southern Medical University, Guangzhou 510280, China; (J.C.); (J.D.)
| | - Jingtao Dai
- Department of Oral Implantology, Stomatological Hospital, Southern Medical University, Guangzhou 510280, China; (J.C.); (J.D.)
| | - Junyu Qian
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (J.Q.); (G.W.)
| | - Weirong Li
- Medical Device Division, Dongguan Eontec Co., Ltd., Dongguan 523662, China; (W.L.); (R.L.); (D.P.)
| | - Ronghui Li
- Medical Device Division, Dongguan Eontec Co., Ltd., Dongguan 523662, China; (W.L.); (R.L.); (D.P.)
| | - Dong Pang
- Medical Device Division, Dongguan Eontec Co., Ltd., Dongguan 523662, China; (W.L.); (R.L.); (D.P.)
| | - Guojiang Wan
- Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; (J.Q.); (G.W.)
| | - Ping Li
- Department of Oral Implantology, Stomatological Hospital, Southern Medical University, Guangzhou 510280, China; (J.C.); (J.D.)
- Correspondence: (P.L.); (S.X.)
| | - Shulan Xu
- Department of Oral Implantology, Stomatological Hospital, Southern Medical University, Guangzhou 510280, China; (J.C.); (J.D.)
- Correspondence: (P.L.); (S.X.)
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