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Kranz S, Heyder M, Rabe U, Liu P, Mrozinska A, Guellmar A, Berg A, Steen D, Tuckermann J, Watts DC, Sigusch B, Reise M. Osseointegration of photodynamic active biomaterials for bone regeneration in an animal bone model over a period of 12 months. Dent Mater 2023; 39:977-985. [PMID: 37709590 DOI: 10.1016/j.dental.2023.09.001] [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: 05/09/2023] [Revised: 09/04/2023] [Accepted: 09/06/2023] [Indexed: 09/16/2023]
Abstract
OBJECTIVES Previous efforts led to the development of two different polymeric biomaterials for periodontal regeneration with antibacterial photodynamic surface activity. The present study aimed to investigate osseointegration and bone formation of both materials in an ovine model. METHODS Both biomaterials: 1) urethane dimethacrylate-based Biomaterial 1 (BioM1) and 2) tri-armed oligoester-urethane methacrylate-based Biomaterial 2 (BioM2) are enriched with beta-tri-calcium phosphate and the photosensitizer meso-tetra(hydroxyphenyl)chlorin (mTHPC). These materials were implanted in non-critical size bone defects in the sheep femur (n = 16) and tibia (n = 8). Empty defects served as controls (n = 16). Polyfluorochrome sequential bone labeling was carried out at baseline and after 3, 6, and 12 months. Animals were sacrificed after 12 months. Bone specimens (n = 40) were fixed and subjected to microtomographic analysis (µCT) for the evaluation of the bone-volume-fraction (BV/TV), trabecular number and trabecular thickness. Subsequently, histological sections were arranged and polyfluorochrome sequential bone labeling was analyzed by confocal laser scanning microscopy (cLSM). RESULTS cLSM analysis revealed that highest remodeling and bone formation activity occurred during the second half of the study period (6-12 months). Bone formation in the tibia was significantly lower for the control (2.71 ± 1.26%) as compared to BioM1 (6.01 ± 2.99%) and BioM2 (6.45 ± 2.12%); (p = 0.006, p = 0004). Micro-computed tomography revealed a BV/TV volume fraction of 44.72 ± 9.01% in femur defects filled with BioM1 which was significantly higher compared to the control (32.27 ± 7.02%; p = 0.01). Bone architecture (trabecular number, trabecular thickness) did not significantly differ from the self-healed defects. SIGNIFICANCE Both biomaterials, especially BioM1 showed good osseointegration and bone formation characteristics and can be recommended for further examination in periodontal regeneration studies.
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Affiliation(s)
- S Kranz
- Department of Conservative Dentistry and Periodontology, University Hospital Jena, An der, alten Post 4, 07743 Jena, Germany.
| | - M Heyder
- Department of Conservative Dentistry and Periodontology, University Hospital Jena, An der, alten Post 4, 07743 Jena, Germany
| | - U Rabe
- Department of Conservative Dentistry and Periodontology, University Hospital Jena, An der, alten Post 4, 07743 Jena, Germany
| | - P Liu
- Institute of Comparative Molecular Endocrinology, University Ulm, Helmholtzstr. 8/1, 9081 Ulm, Germany
| | - A Mrozinska
- Department of Conservative Dentistry and Periodontology, University Hospital Jena, An der, alten Post 4, 07743 Jena, Germany
| | - A Guellmar
- Department of Conservative Dentistry and Periodontology, University Hospital Jena, An der, alten Post 4, 07743 Jena, Germany
| | - A Berg
- Department of Biomaterials, INNOVENT e.V., Prüssingstr. 27b, 07745 Jena, Germany
| | - D Steen
- biolitec research GmbH, Otto-Schott-Str. 15, 07745 Jena, Germany
| | - J Tuckermann
- Institute of Comparative Molecular Endocrinology, University Ulm, Helmholtzstr. 8/1, 9081 Ulm, Germany
| | - David C Watts
- University of Manchester, School of Medical Sciences, Oxford Road, M13 9PL Manchester, UK
| | - Bernd Sigusch
- Department of Conservative Dentistry and Periodontology, University Hospital Jena, An der, alten Post 4, 07743 Jena, Germany
| | - M Reise
- Department of Conservative Dentistry and Periodontology, University Hospital Jena, An der, alten Post 4, 07743 Jena, Germany
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Balakumar B, Jasper A, Livingstone RS, Gangadharan S, Gibikote S, Madhuri V. Can Pixel Value Ratio be Used in the Assessment of Ceramic Bone Substitute Incorporation? Observations from a Pilot Study. Pol J Radiol 2017; 82:706-712. [PMID: 29657637 PMCID: PMC5894053 DOI: 10.12659/pjr.903022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2016] [Accepted: 02/10/2017] [Indexed: 11/09/2022] Open
Abstract
Background Assessment of bone graft substitute incorporation is critical in the clinical decision making process and requires special investigations. We examined if the pixel value ratio (PVR) obtained in routine follow-up digital radiographs could be used for such assessment. Material/Methods Radiographic images were acquired using either computed radiography or flat panel digital radiography systems. The PVR from radiographs of thirty children with ceramic bone substitute grafting were analyzed using the software from the picture archival and communication system (PACS) workstation. Graft incorporation was also assessed using the van Hemert scale. Three independent observers (A, B, C) measured PVRs at two different time points during the first and the last follow-up visits. PVR was compared with the van Hemert scale scores and analyzed using Spearman's rank correlation. Results The mean intra-observer reliability was 0.8996, and inter-observer reliabilities were 0.69 (A vs. C), 0.78 (A vs. B), and 0.85 (B vs. C) for the first follow-up visit and 0.74 (A vs. C), 0.82 (A vs. B), and 0.70 (B vs. C) for the last follow-up measurements. Spearman's correlation showed a strong negative association between PVR values and van Hemert scale scores, as the healing process advanced on serial measurements at each follow-up (r=-0.94, n=60, z=-7.24, p≤0.0001). The reliability of the PVR measurements was assessed using an aluminum step wedge and ceramic graft. Conclusions PVR is potentially a reliable indicator of bone graft incorporation and can aid in clinical decision making provided standard radiographic techniques are used.
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Affiliation(s)
| | - Anitha Jasper
- Department of Radiodiagnosis, Christian Medical College, Vellore, India
| | | | | | - Sridhar Gibikote
- Department of Radiodiagnosis, Christian Medical College, Vellore, India
| | - Vrisha Madhuri
- Pediatric Orthopedic Unit, Christian Medical College, Vellore, India
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Knothe Tate ML, Dolejs S, Miller RM, Knothe UR. Role of mechanical loading in healing of massive bone autografts. J Orthop Res 2010; 28:1657-64. [PMID: 20589937 DOI: 10.1002/jor.21190] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We assessed healing of a 3.5 cm autograft transport segment, denuded of periosteum, and docked to the healthy distal femur with an intramedullary nail. We hypothesized that healing relates to proximity to the healthy distal femur and to mechanical loading patterns. Total bone area, area of new bone apposition, and quality of new bone formed in the 2 weeks after surgery, and area and degree of perfusion 16 weeks after surgery were measured as a function of proximity and loading patterns (as defined by the major and minor centroidal axes, CA). At 16 weeks, no significant differences in early bone apposition or perfusion were observed as a function of distance from the healthy distal femur. Qualitatively, bone was well perfused, both vascularly and pericellularly, and highly remodeled. When cross-sections were pooled from distal to proximal through the docking zone and normalized for total bone area, significant differences in the amount of early proliferative woven bone were related to loading patterns. In contrast, no differences in normalized perfusion area were attributable to loading patterns. Furthermore, early bone apposition and perfusion decreased with increasing radial distance from the bone surface toward the intramedullary nail. Finally, no differences were observed in areas of resorption within the docking zone compared to baseline levels measured in the control (in bone removed to create the defect zone at the time of surgery). Interestingly, infilling of resorption spaces within docking zone specimens related significantly to predominant loading patterns, where areas within the major CA exhibited significantly more infilling.
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Affiliation(s)
- Melissa L Knothe Tate
- Department of Biomedical Engineering, Case Western Reserve University, 10900 Euclid Ave, Wickenden 309, Cleveland, Ohio 44106, USA
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