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Poon KK, Wurm MC, Evans DM, Einarsrud MA, Lutz R, Glaum J. Biocompatibility of (Ba,Ca)(Zr,Ti)O 3 piezoelectric ceramics for bone replacement materials. J Biomed Mater Res B Appl Biomater 2019; 108:1295-1303. [PMID: 31444960 DOI: 10.1002/jbm.b.34477] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/01/2019] [Accepted: 08/06/2019] [Indexed: 02/02/2023]
Abstract
Total joint replacement implants are generally designed to physically mimic the biological environment to ensure compatibility with the host tissue. However, implant instability exposes patients to long recovery periods, high risk for revision surgeries, and high expenses. Introducing electrical stimulation to the implant site to accelerate healing is promising, but the cumbersome nature of wired devices is detrimental to the implant design. We propose a novel strategy to stimulate cells at the implant site by utilizing piezoelectric ceramics as electrical stimulation sources. The inherent ability of these materials to form electric surface potentials under mechanical load allows them to act as internal power sources. This characteristic is commonly exploited in non-biomedical applications such as transducers or sensors. We investigate calcium/zirconium-doped barium titanate (BCZT) ceramics in an in vitro environment to determine their potential as implant materials. BCZT exhibits low cytotoxicity with human osteoblast and endothelial cells as well as high piezoelectric responses. Microstructural adaptation was identified as a route for optimizing piezoelectric behavior. Our results show that BCZT is a promising system for biomedical applications. Its characteristic ability to autonomously generate electric surface potentials opens the possibility to functionalize existing bone replacement implant designs to improve implant ingrowth and long-term stability.
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Affiliation(s)
- Kara K Poon
- Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim, Norway
| | - Matthias C Wurm
- Department of Oral and Maxillofacial Surgery, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Donald M Evans
- Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim, Norway
| | - Mari-Ann Einarsrud
- Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim, Norway
| | - Rainer Lutz
- Department of Oral and Maxillofacial Surgery, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Julia Glaum
- Department of Materials Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim, Norway
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Kerker FA, Adler W, Brunner K, Moest T, Wurm MC, Nkenke E, Neukam FW, von Wilmowsky C. Correction to: Anatomical locations in the oral cavity where surgical resections of oral squamous cell carcinomas are associated with a close or positive margin-a retrospective study. Clin Oral Investig 2018; 23:509. [PMID: 30543024 DOI: 10.1007/s00784-018-2781-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The following note was inadvertently omitted from the published paper: This work was performed in (partial) fulfillment of the requirements for the first author's obtaining the degree Dr. med. dent.
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Affiliation(s)
- Florian Alexander Kerker
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany
| | - Werner Adler
- Department of Medical Informatics, Biometry and Epidemiology, University of Erlangen-Nürnberg, Waldstraße 6, 91054, Erlangen, Germany
| | - Kathrin Brunner
- Department of Pathology, University of Erlangen-Nürnberg, Krankenhausstraße 8-10, 91054, Erlangen, Germany
| | - Tobias Moest
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany
| | - Matthias C Wurm
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany
| | - Emeka Nkenke
- Department of Cranio-, Maxillofacial and Oral Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
| | - Friedrich Wilhelm Neukam
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany
| | - Cornelius von Wilmowsky
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany.
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Wurm MC, Hagen J, Nkenke E, Neukam FW, Schlittenbauer T. The fitting accuracy of pre-bend reconstruction plates and their impact on the temporomandibular joint. J Craniomaxillofac Surg 2018; 47:53-59. [PMID: 30470467 DOI: 10.1016/j.jcms.2018.05.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 04/05/2018] [Accepted: 05/11/2018] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Various causes for bone defects of the lower jaw have been described. As a result, patients often suffer from compromised aesthetics and a loss of, or reduction in, important physiological functions, such as swallowing, breathing, and speaking. A change in the shape of the lower jaw can impair the natural occlusion and leads to an atypical or modified position of the temporomandibular joint. Titanium reconstruction plates are the standard approach to jaw reconstruction, and are used for temporary bridging of a jaw defect or fixation of a bone graft. Conventionally these plates are intraoperatively adjusted to the mandible by the surgeon. Computer-aided manufacturing, computer-aided design, and rapid prototyping have gained increasing importance in the field of medicine, as they allow the production of individual models of the lower jaw, with the possibility of preoperatively bending the reconstruction plates. In this retrospective study, the accuracy of pre-bent titanium plates and their effect on the temporomandibular joint situation in comparison with intraoperatively curved plates will be discussed. MATERIALS AND METHODS Patients who attended our department for lower jaw reconstruction between March 2013 and February 2015 were included in this retrospective study. Within that time 20 patients were treated with pre-bent reconstruction plates (group 1). 20 comparable patients were selected with reconstruction and conventional intraoperative bending (group 2). To evaluate the accuracy of the plates and the condylar position, postoperative cone beam computed tomograms and computed tomograms were used to assess the bone-plate distance at 12 defined points and four angles in axial reconstruction. The results were compared, statistically evaluated, and discussed. RESULTS Regarding the maximum bone-plate distances and the sum of distances, there was a significant difference between the accuracy of the pre-bent and the conventionally bent reconstruction plates (p = 0.022, p = 0.048). Regarding the condylar position, there was no significant difference between both methods (p = 0.867). CONCLUSION The results of this study show that a better fitting accuracy can be achieved using pre-bent plates. Preparation of the plates proves to be advantageous and meaningful, especially in complex bone defects and deformations of the lower jaw. Nevertheless, concerning the position of the temporomandibular joint, no significant difference could be ascertained between the shown methods, contradicting several studies.
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Affiliation(s)
- Matthias C Wurm
- Department of Oral and Maxillofacial Surgery (Head of Department Friedrich Wilhelm Neukam, Prof., MD, DMD, PhD, Dr. h. c), Friedrich-Alexander-University Erlangen-Nuremberg, Glueckstrasse 11, 91054 Erlangen, Germany
| | - Julia Hagen
- Department of Oral and Maxillofacial Surgery (Head of Department Friedrich Wilhelm Neukam, Prof., MD, DMD, PhD, Dr. h. c), Friedrich-Alexander-University Erlangen-Nuremberg, Glueckstrasse 11, 91054 Erlangen, Germany
| | - Emeka Nkenke
- Department of Cranio-Maxillofacial and Oral Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090 Vienna, Austria
| | - Friedrich Wilhelm Neukam
- Department of Oral and Maxillofacial Surgery (Head of Department Friedrich Wilhelm Neukam, Prof., MD, DMD, PhD, Dr. h. c), Friedrich-Alexander-University Erlangen-Nuremberg, Glueckstrasse 11, 91054 Erlangen, Germany
| | - Tilo Schlittenbauer
- Department of Oral and Maxillofacial Surgery (Head of Department Friedrich Wilhelm Neukam, Prof., MD, DMD, PhD, Dr. h. c), Friedrich-Alexander-University Erlangen-Nuremberg, Glueckstrasse 11, 91054 Erlangen, Germany.
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Kerker FA, Adler W, Brunner K, Moest T, Wurm MC, Nkenke E, Neukam FW, von Wilmowsky C. Anatomical locations in the oral cavity where surgical resections of oral squamous cell carcinomas are associated with a close or positive margin-a retrospective study. Clin Oral Investig 2018; 22:1625-1630. [PMID: 29572686 DOI: 10.1007/s00784-018-2424-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 03/13/2018] [Indexed: 12/15/2022]
Abstract
OBJECTIVES This study aimed to identify anatomical areas where resections of oral squamous cell carcinomas (OSCC) are significantly associated with close or positive margins. MATERIALS AND METHODS This retrospective study included 330 patients with a primary OSCC from 2010 to 2015. Patient and tumour data were categorised into three groups by R-status (R0 [clear], ≥ 5 mm, 185 patients [56.06%]; R1 [positive], < 1 mm, 24 patients [7.27%]; and R0 [close], 1-5 mm, 121 patients [36.67%]). RESULTS Areas where resections were significantly associated with close or positive margins were the hard palate (p < 0.001), buccal mucosa (p = 0.03), floor of the mouth (p = 0.004), lower alveolar ridge (p = 0.01), retromolar triangle (p = 0.005), and dorsal tongue (p = 0.02). CONCLUSIONS Anatomical areas were identified in the oral cavity where it is challenging to resect OSCCs with an adequate safety margin. CLINICAL RELEVANCE These results may enable surgeons to achieve a postulated safe distance during tumour resection, leading to a survival benefit for patients.
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Affiliation(s)
- Florian Alexander Kerker
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany
| | - Werner Adler
- Department of Medical Informatics, Biometry and Epidemiology, University of Erlangen-Nürnberg, Waldstraße 6, 91054, Erlangen, Germany
| | - Kathrin Brunner
- Department of Pathology, University of Erlangen-Nürnberg, Krankenhausstraße 8-10, 91054, Erlangen, Germany
| | - Tobias Moest
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany
| | - Matthias C Wurm
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany
| | - Emeka Nkenke
- Department of Cranio-, Maxillofacial and Oral Surgery, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria
| | - Friedrich Wilhelm Neukam
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany
| | - Cornelius von Wilmowsky
- Department of Oral and Maxillofacial Surgery, University of Erlangen-Nürnberg, Glückstrasse 11, 91054, Erlangen, Germany.
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Wurm MC, Möst T, Bergauer B, Rietzel D, Neukam FW, Cifuentes SC, Wilmowsky CV. In-vitro evaluation of Polylactic acid (PLA) manufactured by fused deposition modeling. J Biol Eng 2017; 11:29. [PMID: 28919925 PMCID: PMC5594599 DOI: 10.1186/s13036-017-0073-4] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Accepted: 08/01/2017] [Indexed: 12/02/2022] Open
Abstract
Background With additive manufacturing (AM) individual and biocompatible implants can be generated by using suitable materials. The aim of this study was to investigate the biological effects of polylactic acid (PLA) manufactured by Fused Deposition Modeling (FDM) on osteoblasts in vitro according to European Norm / International Organization for Standardization 10,993–5. Method Human osteoblasts (hFOB 1.19) were seeded onto PLA samples produced by FDM and investigated for cell viability by fluorescence staining after 24 h. Cell proliferation was measured after 1, 3, 7 and 10 days by cell-counting and cell morphology was evaluated by scanning electron microscopy. For control, we used titanium samples and polystyrene (PS). Results Cell viability showed higher viability on PLA (95,3% ± 2.1%) than in control (91,7% ±2,7%). Cell proliferation was highest in the control group (polystyrene) and higher on PLA samples compared to the titanium samples. Scanning electron microscopy revealed homogenous covering of sample surface with regularly spread cells on PLA as well as on titanium. Conclusion The manufacturing of PLA discs from polylactic acid using FDM was successful. The in vitro investigation with human fetal osteoblasts showed no cytotoxic effects. Furthermore, FDM does not seem to alter biocompatibility of PLA. Nonetheless osteoblasts showed reduced growth on PLA compared to the polystyrene control within the cell experiments. This could be attributed to surface roughness and possible release of residual monomers. Those influences could be investigated in further studies and thus lead to improvement in the additive manufacturing process. In addition, further research focused on the effect of PLA on bone growth should follow. In summary, PLA processed in Fused Deposition Modelling seems to be an attractive material and method for reconstructive surgery because of their biocompatibility and the possibility to produce individually shaped scaffolds.
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Affiliation(s)
- Matthias C Wurm
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| | - Tobias Möst
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| | - Bastian Bergauer
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| | - Dominik Rietzel
- Institute for Polymer Technology, Friedrich-Alexander-University Erlangen-Nuremberg, Am Weichselgarten 9, 91058 Erlangen, Germany
| | - Friedrich Wilhelm Neukam
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
| | - Sandra C Cifuentes
- Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Química, IAAB, Universidad Carlos III de Madrid, Avda. de la Universidad, 30, 28911 Leganés, Madrid Spain
| | - Cornelius von Wilmowsky
- Department of Oral and Maxillofacial Surgery, University Hospital Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany
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