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Ciobanu P, Danciu M, Pascu A, Gardikiotis I, Forna N, Sirbu MT, Calistru AE, Puha B, Veliceasa B, Sirbu PD. Experimental Study on Rats with Critical-Size Bone Defects Comparing Effects of Autologous Bone Graft, Equine Bone Substitute Bio-Gen ® Alone or in Association with Platelet-Rich Fibrin (PRF). Polymers (Basel) 2024; 16:1502. [PMID: 38891449 PMCID: PMC11175103 DOI: 10.3390/polym16111502] [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: 04/11/2024] [Revised: 05/17/2024] [Accepted: 05/23/2024] [Indexed: 06/21/2024] Open
Abstract
BACKGROUND A critical-sized bone defect (CsBD) is considered one that will not heal spontaneously and requires reconstruction. This study aims to compare the results of using different bone reconstructive techniques and to study the potential of platelet-rich fibrin (PRF) to enhance the healing properties of a bone substitute (BS). METHODS In this experimental study on rats, the treatment of critical-sized bone defects was carried out by analysing four groups: a control group in which the bone defect was left empty; a group treated with Bio-Gen®; another group in which the defect was treated with PRF in combination with Bio-Gen®; and the last that was treated with autologous bone graft (ABG). The defects were evaluated by microcomputed tomography (µCT) and then histomorphometrically. RESULTS From both the histological and imagistic point of view, the best results were registered in the ABG group, followed by the group treated with Bio-Gen® with PRF, Bio-Gen® group, and control group, with statistically significant differences. CONCLUSIONS A 5 mm defect in the rat radius can be considered critical. ABG showed the best results in treating the bone defect. PRF significantly enhanced the efficacy of Bio-Gen®.
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Affiliation(s)
- Petru Ciobanu
- Department of Surgery II—Orthopedics and Traumatology, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 700454 Iasi, Romania
| | - Mihai Danciu
- Department of Morphofunctional Sciences I—Morphopathology, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 700454 Iasi, Romania
| | - Andrei Pascu
- Department of Morphofunctional Sciences I—Morphopathology, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 700454 Iasi, Romania
| | - Ioannis Gardikiotis
- Advanced Center for Research and Development in Experimental Medicine, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 700454 Iasi, Romania
| | - Norin Forna
- Department of Surgery II—Orthopedics and Traumatology, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 700454 Iasi, Romania
| | - Mihnea Theodor Sirbu
- Faculty of Medicine, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 700454 Iasi, Romania
| | - Anca-Elena Calistru
- Research Institute for Agriculture and Environment, Iasi University of Life Science, 700490 Iasi, Romania
| | - Bogdan Puha
- Department of Surgery II—Orthopedics and Traumatology, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 700454 Iasi, Romania
| | - Bogdan Veliceasa
- Department of Surgery II—Orthopedics and Traumatology, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 700454 Iasi, Romania
| | - Paul-Dan Sirbu
- Department of Surgery II—Orthopedics and Traumatology, Grigore T. Popa University of Medicine and Pharmacy of Iasi, 700454 Iasi, Romania
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da Costa RR, da Cunha G, Freitas RDS, Weber JBB. Effects of boric acid on alveolar sockets filling after dental extraction in rats. Oral Maxillofac Surg 2024; 28:355-361. [PMID: 37020145 DOI: 10.1007/s10006-023-01151-9] [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: 09/14/2022] [Accepted: 03/26/2023] [Indexed: 04/07/2023]
Abstract
PURPOSE After extraction, dental alveolus filling aims to reduce bone loss and maintain the alveolus volume during patient rehabilitation. Boric acid (BA) is a boron-derived compound with osteogenic properties and an interesting candidate for alveoli filling. This study aims to investigate the osteogenic capacity of the local application of BA in dental socket preservation. METHODS Thirty-two male Wistar rats were submitted to upper right incisor extraction and randomly divided into four groups (n = 8): control group (no intervention), BA (8 mg/kg) socket filling, bone graft (Cerabone®, Botiss, Germany), and BA + bone graft socket filling. Animals were euthanized 28 days after dental extraction. MicroCT and histological analysis were performed to evaluate the newly formed bone on the dental alveolus. RESULTS MicroCT analysis demonstrated that bone volume fraction (BV/TV), bone surface (BS), bone surface/bone volume ratio (BS/BV), bone surface density (BS/TV), trabecular thickness (Tb.Th), total bone porosity (Po-tot), and total volume of pore space (Po.V(tot)) from BA and BA + bone graft rats were significantly different from the control group. Histological evaluation displayed a delayed bone repair in BA rats, with the presence of connective tissue and inflammatory infiltrate. However, the BA + bone graft group demonstrated histological aspects like the bone graft animals, with less organized osteoblasts, suggesting inferior bone repair. CONCLUSION Osteogenic capacity did not depend on the BA local application after 28 days of dental extraction. The presence of inflammation in the BA group can represent toxicity induced by the substance dosage used.
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Affiliation(s)
- Renan R da Costa
- School of Health and Life Sciences, Post-Graduate Program in Dentistry, Pontifical Catholic University of Rio Grande do Sul, PUCRS, Avenida Ipiranga, 6681, Partenon, Porto Alegre, RS, 90619-900, Brazil
| | - Gabriela da Cunha
- School of Health and Life Sciences, Post-Graduate Program in Dentistry, Pontifical Catholic University of Rio Grande do Sul, PUCRS, Avenida Ipiranga, 6681, Partenon, Porto Alegre, RS, 90619-900, Brazil
| | - Raquel D S Freitas
- School of Medicine, Post-Graduate Program in Medicine and Health Sciences, Pontifical Catholic University of Rio Grande do Sul, PUCRS, Porto Alegre, RS, Brazil
- Nutrition Thinking® Co., Tecnopuc, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - João B B Weber
- School of Health and Life Sciences, Post-Graduate Program in Dentistry, Pontifical Catholic University of Rio Grande do Sul, PUCRS, Avenida Ipiranga, 6681, Partenon, Porto Alegre, RS, 90619-900, Brazil.
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Fan DY, Zhai HY, Zhao Y, Qiao X, Zhu DC, Liu HJ, Liu C. The role of cannabinoid receptor 2 in bone remodeling during orthodontic tooth movement. BMC Oral Health 2024; 24:23. [PMID: 38178129 PMCID: PMC10768142 DOI: 10.1186/s12903-023-03810-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2023] [Accepted: 12/19/2023] [Indexed: 01/06/2024] Open
Abstract
BACKGROUND The purpose of this study is to explore the effects of CB2 on bone regulation during orthodontic tooth movement. METHODS Thirty male mice were allocated into 2 groups (n = 15 in each group): wild type (WT) group and CB2 knockout (CB2-/-) group. Orthodontic tooth movement (OTM) was induced by applying a nickel-titanium coil spring between the maxillary first molar and the central incisors. There are three subgroups within the WT groups (0, 7 and 14 days) and the CB2-/- groups (0, 7 and 14 days). 0-day groups without force application. Tooth displacement, alveolar bone mass and alveolar bone volume were assessed by micro-CT on 0, 7 and 14 days, and the number of osteoclasts was quantified by tartrate-resistant acid phosphatase (TRAP) staining. Moreover, the expression levels of RANKL and OPG in the compression area were measured histomorphometrically. RESULTS The WT group exhibited the typical pattern of OTM, characterized by narrowed periodontal space and bone resorption on the compression area. In contrast, the accelerated tooth displacement, increased osteoclast number (P < 0.0001) and bone resorption on the compression area in CB2-/- group. Additionally, the expression of RANKL was significantly upregulated, while OPG showed low levels in the compression area of the CB2 - / - group (P < 0.0001). CONCLUSIONS CB2 modulated OTM and bone remodeling through regulating osteoclast activity and RANKL/OPG balance.
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Affiliation(s)
- Deng-Ying Fan
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - Hao-Yan Zhai
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - Yuan Zhao
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - Xing Qiao
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - De-Chao Zhu
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China
| | - Hui-Juan Liu
- The Key Laboratory of Stomatology, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology, Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China.
| | - Chunyan Liu
- Department of Orthodontics, School and Hospital of Stomatology, Hebei Medical University & Hebei Key Laboratory of Stomatology & Hebei Clinical Research Center for Oral Diseases, East 383 Zhongshan Road, Shijiazhuang, Hebei Province, 050017, China.
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Rizk M, Niederau C, Florea A, Kiessling F, Morgenroth A, Mottaghy FM, Schneider RK, Wolf M, Craveiro RB. Periodontal ligament and alveolar bone remodeling during long orthodontic tooth movement analyzed by a novel user-independent 3D-methodology. Sci Rep 2023; 13:19919. [PMID: 37964111 PMCID: PMC10646115 DOI: 10.1038/s41598-023-47386-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 11/13/2023] [Indexed: 11/16/2023] Open
Abstract
The structural process of bone and periodontal ligament (PDL) remodeling during long-term orthodontic tooth movement (OTM) has not been satisfactorily described yet. Although the mechanism of bone changes in the directly affected alveolar bone has been deeply investigated, detailed knowledge about specific mechanism of PDL remodeling and its interaction with alveolar bone during OTM is missing. This work aims to provide an accurate and user-independent analysis of the alveolar bone and PDL remodeling following a prolonged OTM treatment in mice. Orthodontic forces were applied using a Ni-Ti coil-spring in a split-mouth mice model. After 5 weeks both sides of maxillae were scanned by high-resolution micro-CT. Following a precise tooth movement estimation, an extensive 3D analysis of the alveolar bone adjacent to the first molar were performed to estimate the morphological and compositional parameters. Additionally, changes of PDL were characterized by using a novel 3D model approach. Bone loss and thinning, higher connectivity as well as lower bone mineral density were found in both studied regions. Also, a non-uniformly widened PDL with increased thickness was observed. The extended and novel methodology in this study provides a comprehensive insight about the alveolar bone and PDL remodeling process after a long-duration OTM.
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Affiliation(s)
- Marta Rizk
- Department of Orthodontics, University Hospital RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany
| | - Christian Niederau
- Department of Orthodontics, University Hospital RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany
| | - Alexandru Florea
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Aachen, Germany
- Department of Radiology and Nuclear Medicine, Academic Hospital Maastricht, Maastricht, The Netherlands
- School for Cardiovascular Diseases (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Fabian Kiessling
- Institute for Experimental Molecular Imaging, University Clinic Aachen, RWTH Aachen University, Aachen, Germany
| | - Agnieszka Morgenroth
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Aachen, Germany
| | - Felix M Mottaghy
- Department of Nuclear Medicine, University Hospital RWTH Aachen, Aachen, Germany
- Department of Radiology and Nuclear Medicine, Academic Hospital Maastricht, Maastricht, The Netherlands
- School for Cardiovascular Diseases (CARIM), Maastricht University, Maastricht, The Netherlands
| | - Rebekka K Schneider
- Institute of Cell and Tumor Biology, RWTH Aachen University, Aachen, Germany
| | - Michael Wolf
- Department of Orthodontics, University Hospital RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany
| | - Rogerio B Craveiro
- Department of Orthodontics, University Hospital RWTH Aachen, Pauwelsstr. 30, 52074, Aachen, Germany.
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Putri A, Pramanik F, Azhari A. Micro Computed Tomography and Immunohistochemistry Analysis of Dental Implant Osseointegration in Animal Experimental Model: A Scoping Review. Eur J Dent 2023; 17:623-628. [PMID: 36977479 PMCID: PMC10569876 DOI: 10.1055/s-0042-1757468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023] Open
Abstract
Osseointegration is a complex process that involves the interaction of dental implants, bone, and the immune system. Preclinical testing was carried out to develop a better understanding of the mechanism. Micro-computed tomography (micro-CT) imaging techniques and immunohistochemistry are excellent tools for this objective as both enable quantitative assessment of bone microarchitecture and intercellular interaction. An extensive literature search was conducted using the databases PubMed, Science Direct, Wiley Online, Proquest and Ebscohost from January 2011 to January 2021. Among the publications retrieved, the rat model was the most frequently used experimental protocol, with the tibia being the most frequently implanted site. The region of interest demonstrates a high degree of homogeneity as measured by trabecula but varies in size and shape. The most frequently mentioned micro-CT bone parameter and immunohistochemistry bone markers were bone volume per total volume (BV/TV) and runt-related transcription factors (RUNX). Animal models, micro-CT analysis methods, and immunohistochemistry biomarkers yielded a variety of results in the studies. Understanding bone architecture and the remodeling process will aid in the selection of a viable model for a specific research topic.
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Affiliation(s)
- Annisa Putri
- Dentomaxillofacial Radiology Residency Program, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Farina Pramanik
- Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
| | - Azhari Azhari
- Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Universitas Padjadjaran, Bandung, Indonesia
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Borges JS, Costa VC, Irie MS, de Rezende Barbosa GL, Spin-Neto R, Soares PBF. Definition of the Region of Interest for the Assessment of Alveolar Bone Repair Using Micro-computed Tomography. J Digit Imaging 2023; 36:356-364. [PMID: 36070014 PMCID: PMC9984626 DOI: 10.1007/s10278-022-00693-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 08/10/2022] [Accepted: 08/10/2022] [Indexed: 10/14/2022] Open
Abstract
The objective of this study was to evaluate the influence of the extraction socket (distal or lingual root) and the type of region of interest (ROI) definition (manual or predefined) on the assessment of alveolar repair following tooth extraction using micro-computed tomography (micro-CT). The software package used for scanning, reconstruction, reorientation, and analysis of images (NRecon®, DataViewer®, CT-Analyzer®) was acquired through Bruker < https://www.bruker.com > . The sample comprised the micro-CT volumes of seven Wistar rat mandibles, in which the right first molar was extracted. The reconstructed images were analyzed using the extraction sockets, i.e., the distal and intermediate lingual root and the method of ROI definition: manual (MA), central round (CR), and peripheral round (PR). The bone volume fraction (BV/TV) values obtained were analyzed by two-way ANOVA with Tukey's post hoc test (α = 5%). The distal extraction socket resulted in significantly lower BV/TV values than the intermediate lingual socket for MA (P = 0.001), CR (P < 0.001), and PR (P < 0.001). Regarding the ROI, when evaluating the distal extraction socket, the BV/TV was significantly higher (P < 0.001) for MA than for CR and PR, with a lower BV/TV for CR. However, no significant difference was observed for MA (P = 0.855), CR (P = 0.769), or PR (P = 0.453) in the intermediate lingual extraction socket. The bone neoformation outcome (BV/TV) for alveolar bone repair after tooth extraction is significantly influenced by the ROI and the extraction socket. Using the predefined method with a standardized ROI in the central region of the distal extraction socket resulted in the assessment of bone volume, demonstrating the most critical region of the bone neoformation process.
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Affiliation(s)
- Juliana Simeão Borges
- Department of Periodontology and Implantology, School of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Vitor Cardoso Costa
- Department of Periodontology and Implantology, School of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Milena Suemi Irie
- Department of Periodontology and Implantology, School of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38400-902, Brazil
| | | | - Rubens Spin-Neto
- Department of Dentistry and Oral Health, Section for Oral Radiology, Health, Aarhus University, Aarhus, Denmark
| | - Priscilla Barbosa Ferreira Soares
- Department of Periodontology and Implantology, School of Dentistry, Federal University of Uberlândia, Avenida Pará s/n°, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38400-902, Brazil.
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Figueredo CA, Abdelhay N, Ganatra S, Gibson MP. The role of Dentin Sialophosphoprotein (DSPP) in craniofacial development. J Oral Biol Craniofac Res 2022; 12:673-678. [DOI: 10.1016/j.jobcr.2022.08.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 03/17/2022] [Accepted: 08/10/2022] [Indexed: 11/16/2022] Open
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Three-Dimensional Analysis of Bone Volume Change at Donor Sites in Mandibular Body Bone Block Grafts by a Computer-Assisted Automatic Registration Method: A Retrospective Study. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12147261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This study aimed to evaluate the bone volume change at donor sites in patients who received mandibular body bone block grafts using intensity-based automatic image registration. A retrospective study was conducted with 32 patients who received mandibular bone block grafts between 2017 and 2019 at the Pusan National University Dental Hospital. Cone-beam computed tomography (CBCT) images were obtained before surgery (T0), 1 day after surgery (T1), and 4 months after surgery (T2). Scattered artefacts were removed by manual segmentation. The T0 image was used as the reference image for registration of T1 and T2 images using intensity-based registration. A total of 32 donor sites were analyzed three-dimensionally. The volume and pixel value of the bones were measured and analyzed. The mean regenerated bone volume rate on follow-up images (T2) was 34.87% ± 17.11%. However, no statistically significant differences of regenerated bone volume were noted among the four areas of the donor site (upper anterior, upper posterior, lower anterior, and lower posterior). The mean pixel value rate of the follow-up images (T2) was 78.99% ± 16.9% compared with that of T1, which was statistically significant (p < 0.05). Intensity-based registration with histogram matching showed that newly generated bone is generally qualitatively and quantitatively poorer than the original bone, thus revealing the feasibility of pixel value to evaluate bone quality in CBCT images. Considering the bone mass recovered in this study, 4 months may not be sufficient for a second harvesting, and a longer period of follow-up is required.
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Dudiki T, Nascimento DW, Childs LS, Kareti S, Androjna C, Zhevlakova I, Byzova TV. Progressive skeletal defects caused by Kindlin3 deficiency, a model of autosomal recessive osteopetrosis in humans. Bone 2022; 160:116397. [PMID: 35342016 PMCID: PMC9133165 DOI: 10.1016/j.bone.2022.116397] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/18/2022] [Accepted: 03/21/2022] [Indexed: 11/20/2022]
Abstract
The cellular and molecular mechanisms of bone development and homeostasis are clinically important, but not fully understood. Mutations in integrins and Kindlin3 in humans known as Leukocyte adhesion deficiencies (LAD) cause a wide spectrum of complications, including osteopetrosis. Yet, the rarity, frequent misdiagnosis, and lethality of LAD preclude mechanistic analysis of skeletal abnormalities in these patients. Here, using inducible and constitutive tissue-specific Kindlin3 knockout (K3KO) mice, we show that the constitutive lack of embryonic-Kindlin3 in myeloid lineage cells causes growth retardation, edentulism, and skull deformity indicative of hydrocephaly. Micro-CT analysis revealed craniosynostosis, choanal stenosis, and micrognathia along with other skeletal abnormalities characteristic of osteopetrosis. A marked progression of osteosclerosis occurs in mature to middle-aged adults, resulting in the narrowing of cranial nerve foramina and bone marrow cavities of long bones. However, postnatal-Kindlin3 is less critical for bone remodeling and architecture. Thus, myeloid Kindlin3 is essential for skeletal development and its deficiency leads to autosomal recessive osteopetrosis (ARO). The study will aid in the diagnosis, management, and treatment choices for patients with LAD-III and ARO.
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Affiliation(s)
- Tejasvi Dudiki
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Daniel W Nascimento
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Lauren S Childs
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Swetha Kareti
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Charlie Androjna
- Biomedical Engineering, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Irina Zhevlakova
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Tatiana V Byzova
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195, USA.
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Photodynamic Therapy with Natural Photosensitizers in the Management of Periodontal Disease Induced in Rats. Gels 2022; 8:gels8020134. [PMID: 35200515 PMCID: PMC8872554 DOI: 10.3390/gels8020134] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/11/2022] [Accepted: 02/17/2022] [Indexed: 01/27/2023] Open
Abstract
This study aims to investigate the effect of new natural photosensitizers (PS) (based on oregano essential oil, curcuma extract, and arnica oil) through in vitro cytotoxicity and biological tests in rat-induced periodontal disease, treated with photodynamic therapy (aPDT). The cytotoxicity of PS was performed on human dental pulp mesenchymal stem cells (dMSCs) and human keratinocyte (HaCaT) cell lines. Periodontal disease was induced by ligation of the first mandibular molar of 25 rats, which were divided into 5 groups: control group, periodontitis group, Curcuma and aPDT-treated group, oregano and aPDT-treated group, and aPDT group. The animals were euthanized after 4 weeks of study. Computed tomography imaging has been used to evaluate alveolar bone loss. Hematological and histological evaluation showed a greater magnitude of the inflammatory response and severe destruction of the periodontal ligaments in the untreated group.. For the group with the induced periodontitis and treated with natural photosensitizers, the aPDT improved the results; this therapy could be an important adjuvant treatment. The obtained results of these preliminary studies encourage us to continue the research of periodontitis treated with natural photosensitizers activated by photodynamic therapy.
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Ahmed HMA. A critical analysis of laboratory and clinical research methods to study root and canal anatomy. Int Endod J 2022; 55 Suppl 2:229-280. [DOI: 10.1111/iej.13702] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 02/02/2022] [Accepted: 02/04/2022] [Indexed: 11/30/2022]
Affiliation(s)
- Hany Mohamed Aly Ahmed
- Department of Restorative Dentistry Faculty of Dentistry University of Malaya Kuala Lumpur
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Irie MS, Spin-Neto R, Borges JS, Wenzel A, Soares PBF. Effect of data binning and frame averaging for micro-CT image acquisition on the morphometric outcome of bone repair assessment. Sci Rep 2022; 12:1424. [PMID: 35082347 PMCID: PMC8791988 DOI: 10.1038/s41598-022-05459-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 01/05/2022] [Indexed: 11/09/2022] Open
Abstract
Despite the current advances in micro-CT analysis, the influence of some image acquisition parameters on the morphometric assessment outcome have not been fully elucidated. The aim of this study was to determine whether data binning and frame averaging affect the morphometric outcome of bone repair assessment using micro-CT. Four Wistar rats' tibiae with a surgically created bone defect were imaged with micro-CT six times each, frame averaging set to 1 and 2, and data binning set to 1, 2 and 4, for each of the averaging values. Two-way ANOVA followed by Bonferroni tests assessed the significance of frame averaging and data binning on a set of morphometric parameters assessed in the image volumes (p < 0.01). The effect of frame averaging was not significant for any of the assessed parameters. Increased data binning led to larger trabecular thickness. In contrast, smaller bone volume fraction and bone volume were found as data binning increased. Trabeculae number and trabecular separation were not influenced by any of the parameters. In conclusion, the morphometric outcome of bone repair assessment in micro-CT demonstrated dependency upon data binning, but not frame averaging. Therefore, image acquisition of small anatomical structures (e.g., rat trabeculae) should be performed without data binning.
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Affiliation(s)
- Milena Suemi Irie
- Department of Periodontology and Implantology, School of Dentistry, Federal University of Uberlândia, Avenida Pará s/no, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Rubens Spin-Neto
- Department of Dentistry and Oral Health, Section for Oral Radiology, Aarhus University, Aarhus C, Denmark
| | - Juliana Simeão Borges
- Department of Periodontology and Implantology, School of Dentistry, Federal University of Uberlândia, Avenida Pará s/no, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38400-902, Brazil
| | - Ann Wenzel
- Department of Dentistry and Oral Health, Section for Oral Radiology, Aarhus University, Aarhus C, Denmark
| | - Priscilla Barbosa Ferreira Soares
- Department of Periodontology and Implantology, School of Dentistry, Federal University of Uberlândia, Avenida Pará s/no, Campus Umuarama, Bloco 4L, Bairro Umuarama, Uberlândia, Minas Gerais, 38400-902, Brazil.
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13
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Tan J, Labrinidis A, Williams R, Mian M, Anderson PJ, Ranjitkar S. Micro-CT-Based Bone Microarchitecture Analysis of the Murine Skull. METHODS IN MOLECULAR BIOLOGY (CLIFTON, N.J.) 2022; 2403:129-145. [PMID: 34913121 DOI: 10.1007/978-1-0716-1847-9_10] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
X-ray micro-computed tomography (micro-CT) imaging has important applications in microarchitecture analysis of cortical and trabecular bone structure. While standardized protocols exist for micro-CT-based microarchitecture assessment of long bones, specific protocols need to be developed for different types of skull bones taking into account differences in embryogenesis, organization, development, and growth compared to the rest of the body. This chapter describes the general principles of bone microarchitecture analysis of murine craniofacial skeleton to accommodate for morphological variations in different regions of interest.
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Affiliation(s)
- Jenny Tan
- Adelaide Dental School, The University of Adelaide, Adelaide, SA, Australia
| | - Agatha Labrinidis
- Adelaide Microscopy, The University of Adelaide, Adelaide, SA, Australia
| | - Ruth Williams
- Adelaide Microscopy, The University of Adelaide, Adelaide, SA, Australia
| | - Mustafa Mian
- Adelaide Dental School, The University of Adelaide, Adelaide, SA, Australia
| | - Peter J Anderson
- Adelaide Dental School, The University of Adelaide, Adelaide, SA, Australia.,Australian Craniofacial Unit, Women's and Children's Hospital, North Adelaide, SA, Australia.,South Australian Health and Medical Research Institute (SAHMRI), Adelaide, SA, Australia
| | - Sarbin Ranjitkar
- Adelaide Dental School, The University of Adelaide, Adelaide, SA, Australia. .,Department of Dentistry and Oral Health, La Trobe Rural Health School, La Trobe University, Bendigo, VIC, Australia.
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14
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Padala SR, Kashyap B, Dekker H, Mikkonen JJW, Palander A, Bravenboer N, Kullaa AM. Irradiation affects the structural, cellular and molecular components of jawbones. Int J Radiat Biol 2021; 98:136-147. [PMID: 34855558 DOI: 10.1080/09553002.2022.2013568] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PURPOSE Emerging evidence shows that changes in the bone and its microenvironment following radiotherapy are associated with either an inhibition or a state of low bone formation. Ionizing radiation is damaging to the jawbone as it increases the complication rate due to the development of hypovascular, hypocellular, and hypoxic tissue. This review summarizes and correlates the current knowledge on the effects of irradiation on the bone with an emphasis on jawbone, as these have been a less extensively studied area. CONCLUSIONS The stringent regulation of bone formation and bone resorption can be influenced by radiation, causing detrimental effects at structural, cellular, vascular, and molecular levels. It is also associated with a high risk of damage to surrounding healthy tissues and an increased risk of fracture. Technological advances and research on animal models as well as a few human bone tissue studies have provided novel insights into the ways in which bone can be affected by high, low and sublethal dose of radiation. The influence of radiation on bone metabolism, cellular properties, vascularity, collagen, and other factors like inflammation, reactive oxygen species are discussed.
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Affiliation(s)
- Sridhar Reddy Padala
- Institute of Dentistry, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
| | - Bina Kashyap
- Institute of Dentistry, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
| | - Hannah Dekker
- Amsterdam University Medical Centers, Academic Centre for Dentistry Amsterdam (ACTA), Department of Oral and Maxillofacial Surgery/Oral Pathology, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Jopi J W Mikkonen
- Institute of Dentistry, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
| | - Anni Palander
- Institute of Dentistry, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
| | - Nathalie Bravenboer
- Amsterdam UMC, Department of Clinical Chemistry, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.,Department of Internal Medicine, Division of Endocrinology and Center for Bone Quality, Leiden University Medical Center, Leiden, The Netherlands
| | - Arja M Kullaa
- Institute of Dentistry, Faculty of Health Sciences, University of Eastern Finland, Kuopio, Finland
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15
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Körmendi S, Vecsei B, Ambrus S, Orhan K, Dobó-Nagy C. Evaluation of the effect of vitamin D3 on mandibular condyles in an ovariectomized mouse model: a micro-CT study. BMC Oral Health 2021; 21:627. [PMID: 34876086 PMCID: PMC8650511 DOI: 10.1186/s12903-021-01980-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 10/26/2021] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND This study aimed to investigate the effect of ovariectomy and vitamin D3 on bone microstructure; this effect was examined in three regions of interest at one femoral and two mandibular sampling sites bone in an ovariectomized mouse model. METHODS Thirty-six week-old female mice were randomly divided into three groups: 10 subjects were given oral cholecalciferol (vitamin D3) daily for 6 weeks after undergoing bilateral ovariectomy (D3 group), while 10 ovariectomized subjects (OVX) and 10 subjects who underwent a sham operation (SHAM) received peanut oil daily during the investigation. After extermination, the left hemimandible and femur were removed and scanned by micro-CT. The bone micromorphology parameters were analyzed and the BMD was calculated. RESULTS The bone volume fraction (BV/TV) was significantly lower in the trabecular bone of the mandibular condyle in the OVX group than in the SHAM and D3 groups. Also there was a significant difference between the SHAM and D3 groups. The specific bone surface (BS/BV) was significantly higher in the OVX and D3 groups than in the SHAM group. Trabecular thickness (Tb.Th) was significantly higher in the SHAM group, and the trabecular bone pattern factor (Tb.Pf) was significantly higher in the OVX group than in the other two groups. Bone mineral density (BMD) of the femur and the mandible was significantly lower in the OVX group than in the SHAM and D3 groups. CONCLUSIONS Our results show that ovariectomy causes a significantly weaker bone microstructure in the mandibular condyle, where the protective effect of vitamin D3 resulted in a partial resorption.
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Affiliation(s)
- Szandra Körmendi
- Department of Prosthodontics, Semmelweis University, Szentkirályi u. 47, Budapest, 1088 Hungary
| | - Bálint Vecsei
- Department of Prosthodontics, Semmelweis University, Szentkirályi u. 47, Budapest, 1088 Hungary
| | - Szilvia Ambrus
- Department of Prosthodontics, Semmelweis University, Szentkirályi u. 47, Budapest, 1088 Hungary
| | - Kaan Orhan
- Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Emniyet Mah.İncitaş sokak.Sabancı Kız yurdu karşısı, 06500 Ankara, Turkey
| | - Csaba Dobó-Nagy
- Department of Oral Diagnostics, Semmelweis University, Szentkirályi u. 47, Budapest, 1088 Hungary
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16
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Trelenberg-Stoll V, Wolf M, Busch C, Drescher D, Becker K. Standardized assessment of bone micromorphometry around teeth following orthodontic tooth movement : A µCT split-mouth study in mice. J Orofac Orthop 2021; 83:403-411. [PMID: 34342661 PMCID: PMC9596514 DOI: 10.1007/s00056-021-00336-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 05/25/2021] [Indexed: 11/30/2022]
Abstract
Purpose Volumetric quantitative analyses of bone micromorphometry changes following orthodontic tooth movements are hardly standardizable. The present study aimed at validating and applying a novel microcomputed tomography (CT)-based approach that enables the segmentation of teeth and definition of a standardized volume of interest (VOI) around the roots to assess local bone micromorphometry. Methods The jaws of 3 untreated and 14 orthodontically treated mice (protraction of the upper right molar for 11 days with 0.5 N; untreated left upper molar) were scanned with a micro-CT. The first molars and the alveolar bone were segmented, and a standardized VOI was defined around the teeth. The bone volume per total volume (BV/TV) was assessed within the VOI, and BV/TV values were compared between contralateral sites in both untreated (method validation) and treated animals (method application). Results The intraclass correlation coefficient of 0.99 revealed high reliability of the method. In the untreated animals, Bland–Altman analysis confirmed comparable BV/TV fractions (mean difference: −1.93, critical difference: 1.91, Wilcoxon: p = 0.03). In the orthodontically treated animals, BV/TV values were significantly lower at the test compared to the control site (test: 33.23% ± 5.74%, control: 41.33% ± 4.91%, Wilcoxon: p < 0.001). Conclusion Within the limits of the study, the novel approach demonstrated the applicability to evaluate bone micromorphometry around teeth subjected to orthodontic treatment.
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Affiliation(s)
| | - Michael Wolf
- Department of Orthodontics, Universitätsklinikum RWTH Aachen, Aachen, Germany
| | - Caroline Busch
- Department of Oral Surgery, Universitätsklinikum Düsseldorf, Düsseldorf, Germany
| | - Dieter Drescher
- Department of Orthodontics, Universitätsklinikum Düsseldorf, 40225, Düsseldorf, Germany
| | - Kathrin Becker
- Department of Orthodontics, Universitätsklinikum Düsseldorf, 40225, Düsseldorf, Germany.
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17
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Akbulut N, Çetin S, Bilecenoğlu B, Altan A, Ocak M, Şen E, Atakan C, Orhan K. Evaluation of the detectability of early mandible fracture healing findings in terms of vitality aspect by using micro-CT technology in postmortem interval. Leg Med (Tokyo) 2021; 52:101914. [PMID: 34091405 DOI: 10.1016/j.legalmed.2021.101914] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 05/03/2021] [Accepted: 05/26/2021] [Indexed: 11/26/2022]
Abstract
The purpose of the present study was to investigate the vitality aspect of mandibular fractures using micro-CT in the analysis of bone mineral density and other bone microstructure trabecular parameters in the postmortem interval. This study included 72 female Wistar rats. In the study groups, the rats' mandibles were first fractured and after three days of living, the rats were sacrificed. In the control groups, the rats were sacrificed first and then the mandibles were fractured. All rats were left for a natural putrefaction period according to their group's time as week-0, week-1, week-2, week-4, week-8, and week-12. All fractured hemi-mandibles were scanned by micro-CT and analyzed in terms of BMD and other bone trabecular microstructures. BMD and the other bone trabecular microstructures, such as bone volume, percent bone volume, trabecular separation, and trabecular pattern factor, showed statistically significant differences in both the study and control groups (p ≤ 0.05). There were statistically significant differences between the study and control groups in comparisons of BMD in groups 1, 2, 3, 4 and 5, bone volume and percent bone volume in groups 1 and 3, bone surface and bone surface density in group 6, trabecular separation in group 1, and trabecular number, trabecular pattern factor, and structural model index in group 6. Micro-CT scanning and analysis of BMD and other bone trabecular microstructure parameters for evaluation of vitality aspects of mandible fractures in the PMI has various valuable results that should provide guidance for possible studies in the future.
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Affiliation(s)
- Nihat Akbulut
- Tokat Gaziosmanpaşa University, Faculty of Dentistry, Oral and Maxillofacial Surgery Department, Tokat, Turkey
| | - Selçuk Çetin
- Tokat Gaziosmanpaşa University, Faculty of Medicine, Forensic Medicine Department, Tokat, Turkey
| | - Burak Bilecenoğlu
- Ankara Medipol University, Faculty of Medicine, Anatomy Department, Ankara, Turkey
| | - Ahmet Altan
- Tokat Gaziosmanpaşa University, Faculty of Dentistry, Oral and Maxillofacial Surgery Department, Tokat, Turkey.
| | - Mert Ocak
- Ankara University, Faculty of Dentistry, Anatomy Department, Ankara, Turkey
| | - Esengül Şen
- Tokat Gaziosmanpaşa University, Faculty of Dentistry, Oral and Maxillofacial Surgery Department, Tokat, Turkey
| | - Cemal Atakan
- Ankara University, Faculty of Sciences, Statistics Department, Ankara, Turkey
| | - Kaan Orhan
- Ankara University, Faculty of Dentistry, Department of DentoMaxillofacial Radiology, Ankara, Turkey
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18
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Chavez MB, Chu EY, Kram V, de Castro LF, Somerman MJ, Foster BL. Guidelines for Micro-Computed Tomography Analysis of Rodent Dentoalveolar Tissues. JBMR Plus 2021; 5:e10474. [PMID: 33778330 PMCID: PMC7990153 DOI: 10.1002/jbm4.10474] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 01/16/2021] [Accepted: 02/09/2021] [Indexed: 12/21/2022] Open
Abstract
Micro–computed tomography (μCT) has become essential for analysis of mineralized as well as nonmineralized tissues and is therefore widely applicable in the life sciences. However, lack of standardized approaches and protocols for scanning, analyzing, and reporting data often makes it difficult to understand exactly how analyses were performed, how to interpret results, and if findings can be broadly compared with other models and studies. This problem is compounded in analysis of the dentoalveolar complex by the presence of four distinct mineralized tissues: enamel, dentin, cementum, and alveolar bone. Furthermore, these hard tissues interface with adjacent soft tissues, the dental pulp and periodontal ligament (PDL), making for a complex organ. Drawing on others' and our own experience analyzing rodent dentoalveolar tissues by μCT, we introduce techniques to successfully analyze dentoalveolar tissues with similar or disparate compositions, densities, and morphological characteristics. Our goal is to provide practical guidelines for μCT analysis of rodent dentoalveolar tissues, including approaches to optimize scan parameters (filters, voltage, voxel size, and integration time), reproducibly orient samples, define regions and volumes of interest, segment and subdivide tissues, interpret findings, and report methods and results. We include illustrative examples of analyses performed on genetically engineered mouse models with phenotypes in enamel, dentin, cementum, and alveolar bone. The recommendations are designed to increase transparency and reproducibility, promote best practices, and provide a basic framework to apply μCT analysis to the dentoalveolar complex that can also be extrapolated to a variety of other tissues of the body. © 2021 The Authors. JBMR Plus published by Wiley Periodicals LLC. on behalf of American Society for Bone and Mineral Research.
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Affiliation(s)
- Michael B Chavez
- Division of Biosciences, College of Dentistry The Ohio State University Columbus OH USA
| | - Emily Y Chu
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) National Institutes of Health (NIH) Bethesda MD USA
| | - Vardit Kram
- National Institute of Dental and Craniofacial Research (NIDCR)National Institutes of Health (NIH) Bethesda MD USA
| | - Luis F de Castro
- National Institute of Dental and Craniofacial Research (NIDCR)National Institutes of Health (NIH) Bethesda MD USA
| | - Martha J Somerman
- National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) National Institutes of Health (NIH) Bethesda MD USA
| | - Brian L Foster
- Division of Biosciences, College of Dentistry The Ohio State University Columbus OH USA
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19
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Gong C, Wen J, Wang H, Li H. Study of changes in rat mandibular condyle under intermittent cyclic and continuous compressive stress. Arch Oral Biol 2021; 124:105066. [PMID: 33571732 DOI: 10.1016/j.archoralbio.2021.105066] [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: 09/03/2020] [Revised: 01/24/2021] [Accepted: 01/25/2021] [Indexed: 10/22/2022]
Abstract
OBJECTIVES This study aimed to investigate the effects of intermittent and continuous compressive stress on rat mandibular condyles. DESIGN Ninety rats were randomly divided into 5 groups: non-loading control groups and 1-day intermittent cyclic loading, 3-day intermittent cyclic loading, 7-day intermittent cyclic loading, continuous loading groups. In the loading groups, compressive mechanical stresses were loaded onto the condyles. The rats were euthanized after one, two, or four weeks. Histomorphometric and immunochemical staining of the cartilage and the micro-CT scanning of subchondral bone were investigated. RESULTS Under continuous loading following the first week, cartilage thickness, numbers of chondrocytes, extracellular matrix (Type-II collagen) and proliferation decreased significantly, and there was no apparent repair response after the second and fourth weeks. The cartilage of 1-day and 3-day intermittent cyclic loading groups showed similar pathological changes but better proliferative activity compared with the continuous loading group. The 7-day intermittent loading group had significant recovery after 2 weeks, including the increase of cartilage thickness and the number of chondrocytes, cell swelling and rearranging. However, the remodeling of subchondral bone showed no significant difference between the intermittent and continuous loading stress compared to the control group. CONCLUSIONS Under moderate mechanical stress, the condylar cartilage actively remodeled, whereas the subchondral bone, as supportive rigid structure, was less sensitive to mechanical pressure. The intermittent compressive stress protects the condylar cartilage from excessive damage, which is different from continuous compressive stress. With longer intervals, the cartilage has the potential capability for recovery as the initial state.
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Affiliation(s)
- Cheng Gong
- Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China
| | - Juan Wen
- Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China
| | - Huijuan Wang
- Department of Orthodontics, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China
| | - Huang Li
- Department of Oral Science, Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, People's Republic of China.
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20
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Martinez-Zelaya VR, Archilha NL, Calasans-Maia M, Farina M, Rossi AM. Trabecular architecture during the healing process of a tibial diaphysis defect. Acta Biomater 2021; 120:181-193. [PMID: 32860947 DOI: 10.1016/j.actbio.2020.08.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 08/16/2020] [Accepted: 08/19/2020] [Indexed: 01/08/2023]
Abstract
The adaptation of trabecular bone microstructure to mechanical loads has been intensively investigated. However, loading-unrelated aspects of trabecular architecture remain unclear. We used synchrotron radiation-based X-ray microtomography to study the 3D microarchitecture of newly formed trabecular tissue in a defect produced in the cortical region of the rat tibia diaphysis, in the absence (7, 14, and 21 days) or the presence (21 days) of carbonated hydroxyapatite/alginate (cHA) microspheres. This work provides the first evidence that the woven bone trabecular network, formed during the healing process, displays a well-organized 3D microarchitecture consisting of nodes with 3 (3-N), 4 (4-N) and 5 (5-N) connecting trabeculae, with a mean relative abundance of (3-N)/(4-N)/(5-N) = 66/24/7, for the analyzed periods. The measured inter-trabecular angles (ITA) distribution presented a Gaussian profile, with mean value at 115° for 3-N nodes, and 105° for 4-N nodes, close to the angles of idealized 3D regular structures (120° and 109.5°, respectively). Changes in the dispersion of ITA distribution suggested that a highly symmetric trabecular fabric organized under tensegrity principles is formed early during the bone healing process. Post-implantation, cHA disaggregated into multiple fragments (~20-400 μm), stimulating osteoconduction and bone growth toward the interior of the medullary cavity. The presence of biomaterials in bone defects affected the trabecular dimensions; however, it did not interfere with the formation of geometrical motifs with topological parameters similar to those found in the sham-defects. STATEMENT OF SIGNIFICANCE: The trabecular bone microstructure enables the tissue to meet the necessary mechanical and functional demands. However, the process of trabecular microarchitecture formation during healing, in the absence or presence of a bone graft, is not yet well understood. This work demonstrated that, from the beginning of its formation in cortical bone defects, the woven-bone trabecular network is spatially organized according to the principle of tensegrity. This microarchitecture is comprised of highly symmetric geometric motifs and is an intrinsic characteristic of trabecular growth, regardless of hierarchical scale or mechanical stimulation. The addition of a biodegradable nanostructured calcium phosphate graft did not disrupt trabecular microarchitecture; however, graft biodegradation should be controlled to optimize the reproduction of intrinsic trabecular motifs throughout the defect.
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Affiliation(s)
- Victor R Martinez-Zelaya
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Zip Code 13083-970 Campinas, Sao Paulo, Brazil; Department of Condensed Matter, Applied Physics and Nanoscience, Brazilian Center for Research in Physics, Zip Code 22290-180 Rio de Janeiro, RJ, Brazil.
| | - Nathaly L Archilha
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Zip Code 13083-970 Campinas, Sao Paulo, Brazil
| | - Mônica Calasans-Maia
- Oral Surgery Department, Fluminense Federal University, Zip Code 24020-140 Niterói, RJ, Brazil
| | - Marcos Farina
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Zip Code 21941-902 Rio de Janeiro, RJ, Brazil
| | - Alexandre M Rossi
- Department of Condensed Matter, Applied Physics and Nanoscience, Brazilian Center for Research in Physics, Zip Code 22290-180 Rio de Janeiro, RJ, Brazil.
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21
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Fleissig O, Hazan-Molina H, Chaushu S, Aizenbud D, Klein Y, Zini A, Gabet Y. Analytical methodology to measure periodontal bone morphometry following orthodontic tooth movement in mice. Eur J Orthod 2021; 43:665-671. [DOI: 10.1093/ejo/cjaa081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Abstract
Introduction
Basic research in orthodontics is commonly conducted in rodents. However, experimental studies on orthodontic tooth movement (OTM) lack a standard method to examine OTM and periodontal changes. This study describes a unifying protocol for the analysis of OTM and associated bone microarchitectural changes in mice using microcomputed tomography (µCT).
Methods
Mice (10 animals/group) were divided into control and OTM groups. OTM was generated by anchoring a nickel–titanium closed-coil spring to the upper incisors to pull the upper left first molar. A third group of TNFα −/− mice was added since these are known to have slower OTM. Using µCT, we implemented and tested a number of methods to measure OTM distance and examine 3D bone morphometric parameters associated with OTM in mice.
Results
In total, we tested five methods to measure the OTM distance in mice. The results indicated that measuring the intermolar diastema, and assessing tooth movement relative to the anterior root of the zygomatic arch, displayed the lowest standard deviation and enabled optimal detection of intergroup differences. We also developed two protocols for µCT analysis of the periradicular bone that yielded no false-positive results. Our results revealed that including the width of the periodontal ligament rather than excluding it from the region of interest in mice detected more statistically significant differences in the morphometric parameters between the OTM and control sides and between WT and TNFα −/− mice despite more subtle differences.
Conclusions
We, therefore, propose new guidelines for a standardized μCT-based method to analyse OTM and the extent of the periradicular bone structural changes in mice.
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Affiliation(s)
- Omer Fleissig
- Department of Orthodontics, Faculty of Dental Medicine, The Hebrew University and Hadassah, Jerusalem
| | - Hagai Hazan-Molina
- Orthodontic and Craniofacial Center, Graduate School of Dentistry, Rambam Health Care Campus, Bruce Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Haifa
| | - Stella Chaushu
- Department of Orthodontics, Faculty of Dental Medicine, The Hebrew University and Hadassah, Jerusalem
| | - Dror Aizenbud
- Orthodontic and Craniofacial Center, Graduate School of Dentistry, Rambam Health Care Campus, Bruce Rappaport Faculty of Medicine, Technion—Israel Institute of Technology, Haifa
| | - Yehuda Klein
- Department of Orthodontics, Faculty of Dental Medicine, The Hebrew University and Hadassah, Jerusalem
| | - Avraham Zini
- Department of Community Dentistry, Faculty of Dental Medicine, The Hebrew University and Hadassah, Jerusalem
| | - Yankel Gabet
- Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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22
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Koca CG, Kösehasanoğulları M. Evaluation of single-dose applied teriparatide effect on bone healing with histomorphometric and micro-ct analysis. J Craniomaxillofac Surg 2020; 49:98-103. [PMID: 33384204 DOI: 10.1016/j.jcms.2020.12.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 10/12/2020] [Accepted: 12/08/2020] [Indexed: 01/21/2023] Open
Abstract
The aim of the present study was to evaluate the effects of a single dose of locally administered teriparatide (TP) on healing critical-sized defects in rat mandibles through histomorphometric and microcomputed tomography (micro-CT) analyses. In this study, 48 Sprague-Dawley rats were used. The experimental animals were divided into 4 groups as follows: Group 1 had empty defects, Group 2 received autografts, Group 3 received allografts, and Group 4 received allografts combined with 40 μg of TP. Eight weeks after the surgical procedure, all rats were sacrificed, and all specimens were evaluated using micro-CT and histomorphometric analyses. The results of the histomorphometric analysis showed that Group 4 had the most new bone area (0.85 mm2 ± 0.13 mm2) (p = 0.002) and the highest number of osteoblasts (86.61 ± 4.86) (p = 0.001). In addition, the results of the micro-CT analysis showed that Group 4 had the highest bone volume/total volume (23.27% ± 0.15%) (p = 0.001). The histomorphometric and micro-CT values of Group 2 were higher than those of Group 1 but lower than those of Group 3 and Group 4. The results of the study show that a single dose of locally administered TP has a positive effect on the integration of allografts. However, further studies are necessary to identify the mechanism of action and the effective minimum and maximum doses of locally administered TP.
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Affiliation(s)
- Cansu Gül Koca
- Usak University Dentistry Faculty Department of Oral and Maxillofacial Surgery, Uşak, Turkey.
| | - Meryem Kösehasanoğulları
- Usak Training and Research Hospital, Department of Physical Therapy and Rehabilitation, Usak, Turkey.
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23
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Coelho CA, Bordelo JP, Camassa JA, Barros VA, Babo PS, Gomes ME, Reis RL, Azevedo JTDE, Requicha JF, FaÍsca P, Carvalho PP, Viegas CA, Dias IR. Evaluation of hematology, general serum biochemistry, bone turnover markers and bone marrow cytology in a glucocorticoid treated ovariectomized sheep model for osteoporosis research. AN ACAD BRAS CIENC 2020; 92:e20200435. [PMID: 33295580 DOI: 10.1590/0001-3765202020200435] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 10/16/2020] [Indexed: 11/22/2022] Open
Abstract
Osteoporosis is a metabolic disorder characterized by a loss of bone mass and structure and increasing the risk of fragility fractures, mostly among postmenopausal women. Sheep is a recognized large animal model for osteoporosis research. An experimental group of ewes (3-4 years old) was subjected to ovariectomy (OVX) and weekly glucocorticoid (GC) application for 24 weeks and compared with a sham control group. Blood and bone marrow parameters were analyzed before and 24 weeks after OVX and GC administration. Osteopenia was confirmed through micro-computed tomography and histomorphometric analysis of L4 vertebra in the study end. A statistically significant increase was observed in mean corpuscular volume, mean cell hemoglobin and monocytes and a decrease in red blood count and eosinophils (p<0.05). Alkaline phosphatase (ALP), gamma-glutamyl transpeptidase, magnesium and α1-globulin increased, and creatinine, albumin, sodium and estradiol decreased (p<0.05). A slight decrease of bone formation markers (bone ALP and osteocalcin) and an increase of bone resorption markers (C-terminal telopeptides of collagen type 1 and tartrate-resistant acid phosphatase) were observed, but without statistical significance. This study aims to contribute to better knowledge of sheep as a model for osteoporosis research and the consequences that a performed induction protocol may impose on organic metabolism.
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Affiliation(s)
- Catarina A Coelho
- Faculty of Veterinary Medicine (FMV), University Lusófona de Humanidades e Tecnologias (ULHT), Campo Grande, 376 1749-024 Lisbon, Portugal
| | - JoÃo P Bordelo
- Department of Veterinary Sciences, School of Agricultural and Veterinary Sciences (ECAV), University of Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal
| | - JosÉ A Camassa
- Department of Veterinary Sciences, School of Agricultural and Veterinary Sciences (ECAV), University of Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal
| | - Vera A Barros
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães 4805-017, Portugal
| | - Pedro S Babo
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães 4805-017, Portugal
| | - Manuela E Gomes
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães 4805-017, Portugal
| | - Rui L Reis
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães 4805-017, Portugal
| | - Jorge T DE Azevedo
- Department of Animal Sciences, ECAV, UTAD, 5000-801 Vila Real, Portugal.,CECAV - Centre for Animal Sciences and Veterinary Studies, UTAD, 5000-801 Vila Real, Portugal
| | - JoÃo F Requicha
- Department of Veterinary Sciences, School of Agricultural and Veterinary Sciences (ECAV), University of Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal.,CECAV - Centre for Animal Sciences and Veterinary Studies, UTAD, 5000-801 Vila Real, Portugal
| | - Pedro FaÍsca
- Faculty of Veterinary Medicine (FMV), University Lusófona de Humanidades e Tecnologias (ULHT), Campo Grande, 376 1749-024 Lisbon, Portugal.,Research Center in Biosciences and Health Technologies, FMV, ULHT, Campo Grande, 376, 1749-024 Lisbon, Portugal
| | - Pedro P Carvalho
- Department of Veterinary Medicine, University School Vasco da Gama (EUVG), Av. José R. Sousa Fernandes 197, Lordemão, 3020-210 Coimbra, Portugal.,CIVG - Vasco da Gama Research Center, EUVG, 3020-210 Coimbra, Portugal
| | - Carlos A Viegas
- Department of Veterinary Sciences, School of Agricultural and Veterinary Sciences (ECAV), University of Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal.,3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães 4805-017, Portugal.,CITAB - Centre for the Research and Technology of Agro-Environmental and Biological Sciences, UTAD, 5000-801 Vila Real, Portugal
| | - Isabel R Dias
- Department of Veterinary Sciences, School of Agricultural and Veterinary Sciences (ECAV), University of Trás-os-Montes e Alto Douro (UTAD), Quinta de Prados, 5000-801 Vila Real, Portugal.,3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal.,ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães 4805-017, Portugal.,CITAB - Centre for the Research and Technology of Agro-Environmental and Biological Sciences, UTAD, 5000-801 Vila Real, Portugal
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Assessment of irradiated socket healing in the rabbit's mandible: Experimental study. Res Vet Sci 2020; 133:226-231. [PMID: 33032109 DOI: 10.1016/j.rvsc.2020.09.021] [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: 05/20/2020] [Revised: 08/24/2020] [Accepted: 09/17/2020] [Indexed: 11/23/2022]
Abstract
As bone healing is altered after external radiation therapy, its evaluation is mandatory and lacks in clinical practice. The aim of the pilot study was to validate micro computed tomography (microCT) as a simple and reliable technique for assessing irradiated bone healing in the rabbit's mandible and compare with histologic findings. Nineteen rabbits (female New Zealand white) were used. The radiation protocol consisted of 5 sessions delivering 8.5 Gy each. MicroCT was performed at D0, D7, D14, D28 and D42 for the control group and D0, D28 and D42 for the irradiated group. A modified Perry's score was determined on histologic samples, and comparison between microCT and histological findings was performed. The main differences between irradiated and non-irradiated rabbits were observed at Day 28 and 42. There was a strong correlation between imaging and histologic findings. Radiation decreases bone quality and bone mineral density. As the correlation was strong between microCT and histologic findings, micro imaging could be considered as a simple and reliable technique to assess bone healing after radiation therapy and allows an easy comparison between samples, without invasive procedures. Great attention should be kept on the parameters and on the region of interest. The development of in-vivo microCT enlarges the perspectives of microCT use in experimental studies, avoiding invasive procedures, and preserving animal lives and well-being, and furthermore lead to clinical applications.
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25
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Song D, Shujaat S, Zhao R, Huang Y, Shaheen E, Van Dessel J, Orhan K, Vande Velde G, Coropciuc R, Pauwels R, Politis C, Jacobs R. In vivo quantification of mandibular bone remodeling and vascular changes in a Wistar rat model: A novel HR-MRI and micro-CT fusion technique. Imaging Sci Dent 2020; 50:199-208. [PMID: 33005577 PMCID: PMC7506089 DOI: 10.5624/isd.2020.50.3.199] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 06/07/2020] [Accepted: 06/25/2020] [Indexed: 12/16/2022] Open
Abstract
Purpose This study was performed to introduce an in vivo hybrid multimodality technique involving the coregistration of micro-computed tomography (micro-CT) and high-resolution magnetic resonance imaging (HR-MRI) to concomitantly visualize and quantify mineralization and vascularization at follow-up in a rat model. Materials and Methods Three adult female rats were randomly assigned as test subjects, with 1 rat serving as a control subject. For 20 weeks, the test rats received a weekly intravenous injection of 30 µg/kg zoledronic acid, and the control rat was administered a similar dose of normal saline. Bilateral extraction of the lower first and second molars was performed after 10 weeks. All rats were scanned once every 4 weeks with both micro-CT and HR-MRI. Micro-CT and HR-MRI images were registered and fused in the same 3-dimensional region to quantify blood flow velocity and trabecular bone thickness at T0 (baseline), T4 (4 weeks), T8 (8 weeks), T12 (12 weeks), T16 (16 weeks), and T20 (20 weeks). Histological assessment was the gold standard with which the findings were compared. Results The histomorphometric images at T20 aligned with the HR-MRI findings, with both test and control rats demonstrating reduced trabecular bone vasculature and blood vessel density. The micro-CT findings were also consistent with the histomorphometric changes, which revealed that the test rats had thicker trabecular bone and smaller marrow spaces than the control rat. Conclusion The combination of micro-CT and HR-MRI may be considered a powerful non-invasive novel technique for the longitudinal quantification of localized mineralization and vascularization.
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Affiliation(s)
- Dandan Song
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Sohaib Shujaat
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Ruiting Zhao
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Yan Huang
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Eman Shaheen
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Jeroen Van Dessel
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Kaan Orhan
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.,Department of Dentomaxillofacial Radiology, Faculty of Dentistry, University of Ankara, Ankara, Turkey
| | - Greetje Vande Velde
- Biomedical MRI, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven, Leuven, Belgium
| | - Ruxandra Coropciuc
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Ruben Pauwels
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.,Department of Radiology, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.,Aarhus Institute of Advanced Studies, Aarhus University, Aarhus, Denmark
| | - Constantinus Politis
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium
| | - Reinhilde Jacobs
- OMFS IMPATH Research Group, Department of Imaging and Pathology, Faculty of Medicine, KU Leuven and Oral and Maxillofacial Surgery, University Hospitals Leuven, Leuven, Belgium.,Department of Dental Medicine, Karolinska Institute, Stockholm, Sweden
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Ten Years of Micro-CT in Dentistry and Maxillofacial Surgery: A Literature Overview. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10124328] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Micro-computed tomography (micro-CT) is a consolidated imaging technology allowing non-destructive three-dimensional (3D) qualitative and quantitative analysis by the observation of microstructures with high resolution. This paper aims at delivering a structured overview of literature about studies performed using micro-CT in dentistry and maxillofacial surgery (MFS) by analyzing the entire set of articles to portray the state of the art of the last ten years of scientific publications on the topic. It draws the scenario focusing on biomaterials, in vitro and in/ex vivo applications, bone structure analysis, and tissue engineering. It confirms the relevance of the micro-CT analysis for traditional research applications and mainly in dentistry with respect to MFS. Possible developments are discussed in relation to the use of the micro-CT combined with other, traditional, and not, techniques and technologies, as the elaboration of 3D models based on micro-CT images and emerging numerical methods. Micro-CT results contribute effectively with whose ones obtained from other techniques in an integrated multimethod approach and for multidisciplinary studies, opening new possibilities and potential opportunities for the next decades of developments.
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Protective effects of extracorporeal shockwave on rat chondrocytes and temporomandibular joint osteoarthritis; preclinical evaluation with in vivo 99mTc-HDP SPECT and ex vivo micro-CT. Osteoarthritis Cartilage 2019; 27:1692-1701. [PMID: 31323297 DOI: 10.1016/j.joca.2019.07.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 06/30/2019] [Accepted: 07/06/2019] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Extracorporeal shockwave therapy (ESWT) has been shown to have chondroprotective effects on arthritic diseases. We investigated the effects of ESWT on temporomandibular joint osteoarthritis (TMJOA) using rat chondrocytes and TMJOA rat models. DESIGN Cell viability and expression of pro-inflammatory cytokines, cartilage degradation, and apoptosis markers were measured in control, monosodium iodoacetate (MIA)-treated and ESWT plus MIA-treated chondrocytes in vitro, and intra-articular MIA injection (TMJOA) and ESWT on TMJOA rats in vivo. In vivo99mTc-hydroxymethylene diphosphonate (HDP) single-photon emission computerized tomography/computerized tomography (SPECT/CT) and ex-vivo micro-CT and histologic examinations were performed in rat models. RESULTS ESWT plus MIA-treated chondrocytes showed increased cell viability significantly (P = 0.007), while decreased genetic expression of pro-inflammatory cytokines [tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and interleukin-6 (IL-6); P < 0.001 for each] and cartilage degradation markers [matrix metalloproteinase-3 (MMP3), matrix metalloproteinase-13 (MMP13), and bone morphogenetic protein 7 (BMP7); P < 0.001 for each], and number of apoptotic cells (P < 0.001) compared to MIA-treated chondrocytes. Changes in cytochrome c and cleaved caspase-3 levels relative to procaspase-3 were decreased over MIA-treated chondrocytes. ESWT on TMJOA rat models was associated with a significant decrease in pro-inflammatory and cartilage degradation markers, as demonstrated by real-time PCR and immunohistochemistry stains (P < 0.001 for each). On 99mTc-HDP SPECT/CT, the ESWT group showed a significantly lower uptake ratio compared to the TMJOA group (P = 0.008). Micro-CT analysis revealed that the ESWT group showed improved structure and bone quality compared to the TMJOA control group. CONCLUSIONS ESWT was associated with a protective effect on cartilage and subchondral bone structures of TMJOA by reducing inflammation, cartilage degradation, and chondrocyte apoptosis.
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Kwon JJ, Hwang J, Kim YD, Shin SH, Cho BH, Lee JY. Automatic three-dimensional analysis of bone volume and quality change after maxillary sinus augmentation. Clin Implant Dent Relat Res 2019; 21:1148-1155. [PMID: 31651078 DOI: 10.1111/cid.12853] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 09/08/2019] [Accepted: 09/19/2019] [Indexed: 12/13/2022]
Abstract
INTRODUCTION Maxillary sinus augmentation is a widely used surgical procedure to increase the bone volume before implant placement. In order to predict the stability of the implant, analysis of the change in bone volume and quality after a sinus graft procedure is necessary. The purpose of this study was to analyze the change in volume and quality of bone graft material after maxillary sinus augmentation using cone beam computed tomography (CBCT). METHODS AND MATERIALS Maxillary sinus lift procedures using bovine bone materials (Bio-Oss, Geistrich, Swiss) without immediate implantation were performed at the Pusan National University Dental Hospital in 22 patients, from 2014 to 2017. CBCT images were captured before surgery (T1), a day after surgery (T2), and after 4 to 7 months at follow-up (T3). The T2 and T3 images were registered to the T1 image using histogram matching and intensity-based registration. A total of 30 sinuses were analyzed three-dimensionally (3-D), using self-made software MATLAB 2018a (MathWorks, Natick, Massachusetts). The volume and structural indices of the bone graft material were measured and analyzed. RESULTS The average volume of graft material showed a decrease, while the average gray value showed an increase during the follow-up period, but these changes were not statistically significant. The structural indices of the graft material after histogram matching showed a significant difference in homogeneity, connectivity, thickness, and roughness at the postoperative follow-up. CONCLUSIONS The volume and gray value showed no statistically significant changes after the maxillary sinus lift procedures. The results of this study show that structural analysis using histogram matching can be used as a promising tool to analyze the quality of graft materials.
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Affiliation(s)
- Jin-Ju Kwon
- Department of Oral and Maxillofacial Surgery, Pusan National University, Dental Research Institute, Yangsan, Korea
| | - JaeJoon Hwang
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Korea
| | - Yong-Deok Kim
- Department of Oral and Maxillofacial Surgery, Pusan National University, Dental Research Institute, Yangsan, Korea
| | - Sang-Hun Shin
- Department of Oral and Maxillofacial Surgery, Pusan National University, Dental Research Institute, Yangsan, Korea
| | - Bong-Hae Cho
- Department of Oral and Maxillofacial Radiology, School of Dentistry, Pusan National University, Dental Research Institute, Yangsan, Korea
| | - Jae-Yeol Lee
- Department of Oral and Maxillofacial Surgery, Pusan National University, Dental Research Institute, Yangsan, Korea
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Lee JH, Han SS, Lee C, Kim YH, Battulga B. Microarchitectural changes in the mandibles of ovariectomized rats: a systematic review and meta-analysis. BMC Oral Health 2019; 19:128. [PMID: 31242880 PMCID: PMC6595683 DOI: 10.1186/s12903-019-0799-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Accepted: 05/31/2019] [Indexed: 12/14/2022] Open
Abstract
Background This study aimed to examine radiologic microarchitectural changes in the mandibles of ovariectomized (OVX) rats through a systematic review and meta-analysis and to identify factors of the OVX rat model that influence on the bone microstructure. Methods Eligible articles were identified by searching electronic databases, including Embase, Medline, Web of Science, and KoreaMed, for articles published from January 1966 to November 2017. Two reviewers independently performed study selection, data extraction, and quality assessment. The pooled standardized mean difference (SMD) with 95% confidence intervals was calculated using a random-effects model. Subgroup analysis and meta-regression were performed to explore the effect of potential sources on the outcomes. The reliability of the results was assessed by sensitivity analysis and publication bias. Results Of 1160 studies, 16 studies (120 OVX and 120 control rats) were included in the meta-analysis. Compared to the control group, the OVX rats’ trabecular bone volume fraction (SMD = − 2.41, P < 0.01, I2 = 81%), trabecular thickness (SMD = − 1.73, P < 0.01, I2 = 73%) and bone mineral density (SMD = − 0.95, P = 0.01, I2 = 71%) displayed the bone loss consistent with osteoporosis. The trabecular separation (SMD = 1.66, P < 0.01, I2 = 51%) has widen in the OVX mandibular bone in comparison to the control group. However, the trabecular number showed no indication to detect the osteoporosis (SMD = − 0.45, P = 0.38, I2 = 76%). The meta-regression indicated that longer post-OVX periods led to greater changes in bone mineral density (β = − 0.104, P = 0.017). However, the rats’ age at OVX was not linked to bone microstructure change. Conclusions Using meta-regression and sensitivity analysis techniques, heterogeneity across the micro CT studies of OVX-induced osteoporosis was found. The major factors of heterogeneity were the region of interest and post-OVX period. Our assessment can assist in designing experiments to maximize the usefulness of OVX rat model.
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Affiliation(s)
- Jeong-Hee Lee
- Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, 50-1 Yonsei-ro Seodaemun-gu, Seoul, 03722, Korea
| | - Sang-Sun Han
- Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, 50-1 Yonsei-ro Seodaemun-gu, Seoul, 03722, Korea.
| | - Chena Lee
- Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, 50-1 Yonsei-ro Seodaemun-gu, Seoul, 03722, Korea
| | - Young Hyun Kim
- Department of Oral and Maxillofacial Radiology, Yonsei University College of Dentistry, 50-1 Yonsei-ro Seodaemun-gu, Seoul, 03722, Korea
| | - Bulgan Battulga
- School of Dentistry, Mongolian National University of Medical Sciences, Ulaanbaatar, Mongolia
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Abstract
3D analysis of animal or human whole teeth and alveolar bone can be performed with high sensitivity in a nondestructive manner by microcomputed tomography. Here we describe the protocols to be followed for the most common applications in the developmental studies of dental and craniofacial tissues. Emphasis is placed on the basis of choosing settings for image acquisition, such as voxel resolution (Fig. 1), or beam energy (Fig. 2) and for processing, such as segmentation method (Fig. 3), parameters. The limitations to take into account for optimal efficiency and image quality are also explained.
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Affiliation(s)
- Kostas Verdelis
- Department of Restorative Dentistry/Comprehensive Care, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
- Department of Endodontics and Center for Craniofacial Regeneration, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
| | - Phil Salmon
- Department of Restorative Dentistry/Comprehensive Care, School of Dental Medicine, University of Pittsburgh, Pittsburgh, PA, USA
- Bruker microCT, Kontich, Belgium
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31
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Balanta-Melo J, Torres-Quintana MA, Bemmann M, Vega C, González C, Kupczik K, Toro-Ibacache V, Buvinic S. Masseter muscle atrophy impairs bone quality of the mandibular condyle but not the alveolar process early after induction. J Oral Rehabil 2018; 46:233-241. [PMID: 30468522 DOI: 10.1111/joor.12747] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/15/2018] [Accepted: 11/17/2018] [Indexed: 12/27/2022]
Abstract
BACKGROUND Masseter muscle function influences mandibular bone homeostasis. As previously reported, bone resorption markers increased in the mouse mandibular condyle two days after masseter paralysis induced with botulinum toxin type A (BoNTA), followed by local bone loss. OBJECTIVE This study aimed to evaluate the bone quality of both the mandibular condyle and alveolar process in the mandible of adult mice during the early stage of a BoNTA-induced masseter muscle atrophy, using a combined 3D histomorphometrics and shape analysis approach. METHODS Adult BALB/c mice were divided into an untreated control group and an experimental group; the latter received one single BoNTA injection in the right masseter (BoNTA-right) and saline in the left masseter (Saline-left). 3D bone microstructural changes in the mandibular condyle and alveolar process were determined with high-resolution microtomography. Additionally, landmark-based geometric morphometrics was implemented to assess external shape changes. RESULTS After 2 weeks, masseter mass was significantly reduced (P-value <0.001). When compared to Saline-left and untreated condyles, BoNTA-right condyles showed significant bone loss (P-value <0.001) and shape changes. No significant bone loss was observed in the alveolar processes of any of the groups (P-value >0.05). CONCLUSION Condyle bone quality deteriorates at an early stage of BoNTA-induced masseter muscle atrophy, and before the alveolar process is affected. Since the observed bone microstructural changes resemble those in human temporomandibular joint degenerative disorders, the clinical safety of BoNTA intervention in the masticatory apparatus remains to be clarified.
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Affiliation(s)
- Julián Balanta-Melo
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,School of Dentistry, Universidad del Valle, Cali, Colombia.,Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | | | - Maximilian Bemmann
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Carolina Vega
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago, Chile
| | | | - Kornelius Kupczik
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.,Center for Quantitative Analysis in Dental Anthropology, Faculty of Dentistry, Universidad de Chile, Santiago, Chile
| | - Viviana Toro-Ibacache
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,Center for Quantitative Analysis in Dental Anthropology, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Sonja Buvinic
- Institute for Research in Dental Sciences, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,Center for Exercise, Metabolism and Cancer Studies CEMC2016, Faculty of Medicine, Universidad de Chile, Santiago, Chile
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Kustro T, Kiss T, Chernohorskyi D, Chepurnyi Y, Helyes Z, Kopchak A. Quantification of the mandibular defect healing by micro-CT morphometric analysis in rats. J Craniomaxillofac Surg 2018; 46:2203-2213. [PMID: 30343871 DOI: 10.1016/j.jcms.2018.09.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 07/29/2018] [Accepted: 09/19/2018] [Indexed: 12/17/2022] Open
Abstract
PURPOSE The goal of this study was the evaluation of the bone tissue structural characteristics over the time course of mandibular defect healing using micro-CT technique, as well as determination of the inter-relationships between different micro-CT parameters used for assessment of the bone regeneration process and the patterns of their dynamic changes. MATERIALS AND METHODS The body and ramus of the mandible was exposed in 24 Wistar rats. A 2-mm full thickness bony defect was created. Animals were randomized into four groups, which were ended 3, 6, 12 and 24 weeks after operation. The mandible was excised and underwent micro-CT analysis. For statistical evaluation, the Mann-Whitney U test, polynomial or exponential regression and Spearman analysis were applied. RESULTS The absolute volume of the bone regenerate increased from 1.69 ± 0.53 mm3 (3 weeks) to 3.36 mm3 ± 0.56 (6 months), as well as percentage of bone volume, increased significantly from 12.5 ± 2.3% at the 3-week term to 26.4 ± 8.7% at the 3-month term or 23.1 ± 8.7% at the 6-month term. Structural (trabecular) thickness gradually increased from 0.13 ± 0.007 mm at the 3-week term to 0.3 ± 0.11 mm at the 6-month term. The structural model index was 0.79 ± 0.46 in the early phase after trauma and then decreased to negative values. CONCLUSION The bone regeneration process was characterized by a significant increase (p < 0.05) in bone volume, percentage of bone volume, structural thickness and bone mineral density, and a decrease in bone surface-to-volume ratio and volume of pore space from the 3-week term to the 6-month term. These changes can be mathematically described by nonlinear exponential regression models.
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Affiliation(s)
- T Kustro
- Department of Stomatology, Bogomolets National Medical University, 13, T. Shevchenko blvd, 01601, Kyiv, Ukraine
| | - T Kiss
- János Szentágothai Research Centre & Department of Pharmacology and Pharmacotherapy, Medical School, University of Pecs, Ifjúság útja 20, Pécs, H-7624, Hungary
| | - D Chernohorskyi
- Department of Stomatology, Bogomolets National Medical University, 13, T. Shevchenko blvd, 01601, Kyiv, Ukraine
| | - Y Chepurnyi
- Department of Stomatology, Bogomolets National Medical University, 13, T. Shevchenko blvd, 01601, Kyiv, Ukraine.
| | - Z Helyes
- János Szentágothai Research Centre & Department of Pharmacology and Pharmacotherapy, Medical School, University of Pecs, Ifjúság útja 20, Pécs, H-7624, Hungary; PharmInVivo Ltd., Szondi Gy. u. 7, H-7629, Pécs, Hungary
| | - A Kopchak
- Department of Stomatology, Bogomolets National Medical University, 13, T. Shevchenko blvd, 01601, Kyiv, Ukraine
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Chappard D, Kün-Darbois JD, Mercier P, Guillaume B, Aguado E. Microcomputed tomography (microCT) and histology of the mandibular canal in human and laboratory animals. Morphologie 2018; 102:263-275. [PMID: 30245167 DOI: 10.1016/j.morpho.2018.08.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 08/28/2018] [Accepted: 08/28/2018] [Indexed: 11/19/2022]
Abstract
The inferior alveolar nerve (IAN) is a sensitive branch of the trigeminal nerve. It has an intra-bone path in the mandible, inside the mandibular canal, where it is accompanied by lymph, venous and arterial vessels. We have studied the mandibular canal in human mandibles and in some laboratory animals (mice, rats, rabbits and cats). Microcomputed tomography evidenced that the walls of the canal are made with thin plates of trabecular bone with numerous fenestrations. This aspect is evidenced in dentate subjects and become more evident in edentulous subjects with atrophy of the alveolar bone. In rats and mice, the wall of the canal is also clearly composed of trabecular plates coming from the surrounding alveolar bone of the mandible. In the rabbit, similar findings are also observed but the trajectory of the canal is more difficult to identify. In the cat, the floor of the canal is composed of the cortical bone from the basilar cortex of the mandible and the roof has a trabecular nature. Vascular injections of gelatin-barium evidenced the arterial trajectories inside the bone in rats and humans. Undecalcified bone sections in human evidenced the histological aspect of the IAN and its connective sheets. Some nervous bundles can be observed outside the epineurium. Bone remodeling is observed on the wall of the mandibular canal. These descriptive findings have a clinical relevance in dental implantology or mandibular surgery.
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Affiliation(s)
- D Chappard
- Groupe études remodelage osseux et les bioMatériaux (GEROM), Labcom NextBone, IRIS-IBS, institut de biologie en santé, CHU d'Angers, université d'Angers, 49933 Angers cedex, France.
| | - J-D Kün-Darbois
- Groupe études remodelage osseux et les bioMatériaux (GEROM), Labcom NextBone, IRIS-IBS, institut de biologie en santé, CHU d'Angers, université d'Angers, 49933 Angers cedex, France; Service de chirurgie maxillo-faciale et stomatologie, CHU d'Angers, 4, rue Larrey, 49933 Angers cedex, France
| | - P Mercier
- Groupe études remodelage osseux et les bioMatériaux (GEROM), Labcom NextBone, IRIS-IBS, institut de biologie en santé, CHU d'Angers, université d'Angers, 49933 Angers cedex, France; Laboratoire d'anatomie, faculté de santé, 28, rue Roger-Amsler, 49045 Angers cedex 1, France
| | - B Guillaume
- Groupe études remodelage osseux et les bioMatériaux (GEROM), Labcom NextBone, IRIS-IBS, institut de biologie en santé, CHU d'Angers, université d'Angers, 49933 Angers cedex, France; Collège français d'implantologie (CFI), 6, rue de Rome, 75008 Paris, France
| | - E Aguado
- Groupe études remodelage osseux et les bioMatériaux (GEROM), Labcom NextBone, IRIS-IBS, institut de biologie en santé, CHU d'Angers, université d'Angers, 49933 Angers cedex, France; Ministère de l'agriculture et de la pêche, route de Gachet, 44307 Nantes cedex 3, France
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Park HS, Lee J, Kim JW, Kim HY, Jung SY, Lee SM, Park CH, Kim HS. Preventive effects of tonsil-derived mesenchymal stem cells on osteoradionecrosis in a rat model. Head Neck 2017; 40:526-535. [PMID: 29140591 DOI: 10.1002/hed.25004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 08/05/2017] [Accepted: 09/26/2017] [Indexed: 11/08/2022] Open
Abstract
BACKGROUND The purpose of this study was to investigate the effects of tonsil-derived mesenchymal stem cells (MSCs) on osteoradionecrosis (ORN). METHOD We generated a mandibular ORN rat model using a combination of 20-Gy single-dose irradiation and tooth extraction. Study groups were negative control (tooth extraction only), ORN group (irradiation, tooth extraction), Matrigel-1 group (Matrigel; BD Biosciences, San Jose, CA; irradiation, Matrigel application immediately after tooth extraction), tonsil-derived MSC-1 group (irradiation, tonsil-derived MSC application immediately after tooth extraction), Matrigel-4 group (irradiation, Matrigel application 4 weeks after tooth extraction), and tonsil-derived MSC-4 group (irradiation, tonsil-derived MSC application 4 weeks after tooth extraction). RESULT Bone mineral density was significantly lower in the ORN group than in the negative control group. The tonsil-derived MSC-1 group showed significantly higher bone mineral density than did the ORN and tonsil-derived MSC-4 groups. CONCLUSION A single 20-Gy dose of irradiation combined with tooth extraction successfully generated ORN in the rat model. The tonsil-derived MSCs can be effective for bone regeneration in ORN, particularly when applied immediately after dentoalveolar trauma or surgery.
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Affiliation(s)
- Hae Sang Park
- Department of Otorhinolaryngology - Head and Neck Surgery, Chuncheon Sacred Heart Hospital, Hallym University, School of Medicine, Chuncheon, Republic of Korea.,Nano-Bio Regenerative Medical Institute, Hallym University, School of Medicine, Chuncheon, Republic of Korea
| | - Jihae Lee
- Department of Radiation Oncology, School of Medicine, Ewha Womans University, Seoul, Republic of Korea
| | - Jin-Woo Kim
- Department of Oral and Maxillofacial Surgery, Ewha Womans University Medical Center, Seoul, Korea
| | - Ha Young Kim
- Department of Molecular Medicine, School of Medicine, Ewha Womans University, Seoul, Republic of Korea
| | - Soo Yeon Jung
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, EwhaWomans University, Seoul, Republic of Korea
| | - Sung Min Lee
- Department of Otorhinolaryngology - Head and Neck Surgery, Chuncheon Sacred Heart Hospital, Hallym University, School of Medicine, Chuncheon, Republic of Korea
| | - Chan Hum Park
- Department of Otorhinolaryngology - Head and Neck Surgery, Chuncheon Sacred Heart Hospital, Hallym University, School of Medicine, Chuncheon, Republic of Korea.,Nano-Bio Regenerative Medical Institute, Hallym University, School of Medicine, Chuncheon, Republic of Korea
| | - Han Su Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, EwhaWomans University, Seoul, Republic of Korea
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Abstract
Micro-computed tomography can be applied for the assessment of the micro-architectural characteristics of the cortical and trabecular bones in either physiological or disease conditions. However, reports often lack a detailed description of the methodological steps used to analyse these images, such as the volumes of interest, the algorithms used for image filtration, the approach used for image segmentation, and the bone parameters quantified, thereby making it difficult to compare or reproduce the studies. This study addresses this critical need and aims to provide standardized assessment and consistent parameter reporting related to quantitative jawbone image analysis. Various regions of the rat jawbones were screened for their potential for standardized micro-computed tomography analysis. Furthermore, the volumes of interest that were anticipated to be most susceptible to bone structural changes in response to experimental interventions were defined. In the mandible, two volumes of interest were selected, namely, the condyle and the trabecular bone surrounding the three molars. In the maxilla, the maxillary tuberosity region and the inter-radicular septum of the second molar were considered as volumes of interest. The presented protocol provides a standardized and reproducible methodology for the analysis of relevant jawbone volumes of interest and is intended to ensure global, accurate, and consistent reporting of its morphometry. Furthermore, the proposed methodology has potential, as a variety of rodent animal models would benefit from its implementation.
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Kwon HJ, Kim JM, Han KI, Jung EG, Kim YH, Patnaik BB, Yoon MS, Chung SK, Kim WJ, Han MD. Mutan: A mixed linkage α-[(1,3)- and (1,6)]-d-glucan from Streptococcus mutans, that induces osteoclast differentiation and promotes alveolar bone loss. Carbohydr Polym 2016; 137:561-569. [DOI: 10.1016/j.carbpol.2015.11.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2015] [Revised: 11/03/2015] [Accepted: 11/06/2015] [Indexed: 01/04/2023]
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