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Wang Z, Luo W, Zhao C, Yu M, Li H, Zhou F, Wang D, Bai F, Chen T, Xiong Y, Wu Y. FoxO1-modulated macrophage polarization regulates osteogenesis via PPAR-γ signaling. Biochim Biophys Acta Mol Basis Dis 2024; 1870:167333. [PMID: 38960054 DOI: 10.1016/j.bbadis.2024.167333] [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: 01/07/2024] [Revised: 06/06/2024] [Accepted: 06/27/2024] [Indexed: 07/05/2024]
Abstract
Periodontitis, a common chronic inflammatory disease, epitomizes a significant impairment in the host immune system and an imbalance of bone metabolism. Macrophage polarization, a dynamic process dictated by the microenvironment, intricately contributes to the interplay between the immune system and bone remodeling, namely the osteoimmune system. Forkhead box protein O1 (FoxO1) has been shown to play a dramatic role in mediating oxidative stress, bone mass, as well as cellular metabolism. Nevertheless, the function and underlying mechanisms of FoxO1 in regulating macrophage polarization-mediated osteogenesis in periodontitis remain to be further elucidated. Here, we found that FoxO1 expression was closely linked to periodontitis, accompanied by aggravated inflammation. Notably, FoxO1 knockdown skewed macrophage polarization from M1 to the antiinflammatory M2 phenotype under inflammatory conditions, which rescued the impaired osteogenic potential. Mechanistically, we revealed that the enhancement of the transcription of peroxisome proliferator-activated receptor (PPAR) signaling in FoxO1-knockdown macrophages. In agreement with this contention, GW9662, a specific inhibitor of PPAR-γ signaling, greatly aggravated macrophage polarization from M2 to the M1 phenotype and attenuated osteogenic potential under inflammatory conditions. Additionally, PPAR-γ signaling agonist rosiglitazone (RSG) was applied to address ligature-induced periodontitis with attenuated inflammation. Our data lend conceptual credence to the function of FoxO1 in mediating macrophage polarization-regulated osteogenesis which serves as a novel therapeutic target for periodontitis.
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Affiliation(s)
- Zhanqi Wang
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Wenxin Luo
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Chengzhi Zhao
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Muqiao Yu
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Haiyun Li
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Feng Zhou
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Dongyang Wang
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Fuwei Bai
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Tao Chen
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Yi Xiong
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China
| | - Yingying Wu
- State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, Department of Oral Implantology, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, Sichuan, China.
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2
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Liao C, Liang S, Wang Y, Zhong T, Liu X. Sclerostin is a promising therapeutic target for oral inflammation and regenerative dentistry. J Transl Med 2022; 20:221. [PMID: 35562828 PMCID: PMC9102262 DOI: 10.1186/s12967-022-03417-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 04/28/2022] [Indexed: 11/10/2022] Open
Abstract
Sclerostin is the protein product of the SOST gene and is known for its inhibitory effects on bone formation. The monoclonal antibody against sclerostin has been approved as a novel treatment method for osteoporosis. Oral health is one of the essential aspects of general human health. Hereditary bone dysplasia syndrome caused by sclerostin deficiency is often accompanied by some dental malformations, inspiring the therapeutic exploration of sclerostin in the oral and dental fields. Recent studies have found that sclerostin is expressed in several functional cell types in oral tissues, and the expression level of sclerostin is altered in pathological conditions. Sclerostin not only exerts similar negative outcomes on the formation of alveolar bone and bone-like tissues, including dentin and cementum, but also participates in the development of oral inflammatory diseases such as periodontitis, pulpitis, and peri-implantitis. This review aims to highlight related research progress of sclerostin in oral cavity, propose necessary further research in this field, and discuss its potential as a therapeutic target for dental indications and regenerative dentistry.
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Affiliation(s)
- Chufang Liao
- School of Stomatology, Jinan University, Guangzhou, China.,Clinical Research Platform for Interdiscipline of Stomatology, Jinan University, Guangzhou, China.,Department of Stomatology Medical Center, The First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Shanshan Liang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China.,Department of Prosthodontics, Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Yining Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China.,Department of Prosthodontics, Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Ting Zhong
- School of Stomatology, Jinan University, Guangzhou, China.,Clinical Research Platform for Interdiscipline of Stomatology, Jinan University, Guangzhou, China.,Department of Stomatology Medical Center, The First Affiliated Hospital of Jinan University, Guangzhou, China
| | - Xiangning Liu
- School of Stomatology, Jinan University, Guangzhou, China. .,Clinical Research Platform for Interdiscipline of Stomatology, Jinan University, Guangzhou, China. .,Department of Stomatology Medical Center, The First Affiliated Hospital of Jinan University, Guangzhou, China.
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3
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Autogenous Tooth Bone Grafts for Repair and Regeneration of Maxillofacial Defects: A Narrative Review. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19063690. [PMID: 35329377 PMCID: PMC8955500 DOI: 10.3390/ijerph19063690] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 03/16/2022] [Accepted: 03/17/2022] [Indexed: 11/16/2022]
Abstract
Autogenous tooth graft is an innovative and ingenious technique that employs a stepwise approach and utilizes human teeth as an autogenous source of bone graft. The structure of teeth closely resembles bone, both physically and biochemically, and can be efficiently used for the process as it depicts properties of osteoinduction and osteoconduction. Autogenous tooth bone has characteristics similar to bone grafts in terms of healing potential, physical properties, and clinical outcome. Autogenous tooth graft has shown reasonable promise as a graft material for the regeneration of maxillary and mandibular defects. Autogenous tooth bone graft finds its principal application in sinus and ridge augmentations and for socket preservation before implant placement. Additionally, it can be used successfully for alveolar cleft patients and patients with limited periodontal defects. The overall complication rates reported for autogenous tooth grafts are comparable to other graft sources. However, although long-term results are still underway, it is still recommended as a grafting option for limited defects in the cranio-facial region.
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4
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Takagi T, Yamamoto M, Sugano A, Kanehira C, Kitamura K, Katayama M, Sakai K, Sato M, Abe S. Alteration of Oral and Perioral Soft Tissue in Mice following Incisor Tooth Extraction. Int J Mol Sci 2022; 23:ijms23062987. [PMID: 35328407 PMCID: PMC8951366 DOI: 10.3390/ijms23062987] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/06/2022] [Accepted: 03/07/2022] [Indexed: 01/01/2023] Open
Abstract
Oral and perioral soft tissues cooperate with other oral and pharyngeal organs to facilitate mastication and swallowing. It is essential for these tissues to maintain their morphology for efficient function. Recently, it was reported that the morphology of oral and perioral soft tissue can be altered by aging or orthodontic treatment. However, it remains unclear whether tooth loss can alter these tissues’ morphology. This study examined whether tooth loss could alter lip morphology. First, an analysis of human anatomy suggested that tooth loss altered lip morphology. Next, a murine model of tooth loss was established by extracting an incisor; micro-computed tomography revealed that a new bone replaced the extraction socket. Body weight was significantly lower in the tooth loss (UH) group than in the non-extraction control (NH) group. The upper lip showed a greater degree of morphological variation in the UH group. Proteomic analysis and immunohistochemical staining of the upper lip illustrated that S100A8/9 expression was higher in the UH group, suggesting that tooth loss induced lip inflammation. Finally, soft-diet feeding improved lip deformity associated with tooth loss, but not inflammation. Therefore, soft-diet feeding is essential for preventing lip morphological changes after tooth loss.
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Affiliation(s)
- Takahiro Takagi
- Department of Anatomy, Tokyo Dental College, 2-9-18, Kandamisaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan; (T.T.); (C.K.); (S.A.)
| | - Masahito Yamamoto
- Department of Anatomy, Tokyo Dental College, 2-9-18, Kandamisaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan; (T.T.); (C.K.); (S.A.)
- Correspondence:
| | - Aki Sugano
- Department of Dental Hygiene, Tokyo Dental Junior College, 2-9-18, Kandamisaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan;
| | - Chiemi Kanehira
- Department of Anatomy, Tokyo Dental College, 2-9-18, Kandamisaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan; (T.T.); (C.K.); (S.A.)
| | - Kei Kitamura
- Department of Histology and Developmental Biology, Tokyo Dental College, 2-9-18, Kandamisaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan;
| | - Masateru Katayama
- Department of Neurosurgery, Tokyo Dental College, Ichikawa General Hospital, 5-11-13, Sugano, Ichikawa 272-8513, Japan;
| | - Katsuhiko Sakai
- Department of Oral Medicine and Hospital Dentistry, Tokyo Dental College, 5-11-13, Sugano, Ichikawa 272-8513, Japan;
| | - Masaki Sato
- Laboratory of Biology, Tokyo Dental College, 2-9-18, Kandamisaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan;
| | - Shinichi Abe
- Department of Anatomy, Tokyo Dental College, 2-9-18, Kandamisaki-cho, Chiyoda-ku, Tokyo 101-0061, Japan; (T.T.); (C.K.); (S.A.)
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5
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Thim T, Scholz KJ, Hiller KA, Buchalla W, Kirschneck C, Fleiner J, Woelber JP, Cieplik F. Radiographic Bone Loss and Its Relation to Patient-Specific Risk Factors, LDL Cholesterol, and Vitamin D: A Cross-Sectional Study. Nutrients 2022; 14:nu14040864. [PMID: 35215516 PMCID: PMC8877125 DOI: 10.3390/nu14040864] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/01/2022] [Accepted: 02/16/2022] [Indexed: 02/01/2023] Open
Abstract
The influence of patient-specific factors such as medical conditions, low-density lipoprotein cholesterol (LDL-C) or levels of 25-hydroxyvitamin D (25OHD) on periodontal diseases is frequently discussed in the literature. Therefore, the aim of this retrospective cross-sectional study was to evaluate potential associations between radiographic bone loss (RBL) and patient-specific risk factors, particularly LDL-C and 25OHD levels. Patients from a dental practice, who received full-mouth cone beam CTs (CBCTs) and blood-sampling in the course of implant treatment planning, were included in this study. RBL was determined at six sites per tooth from CBCT data. LDL-C and 25OHD levels were measured from venous blood samples. Other patient-specific risk factors were assessed based on anamnesis and dental charts. Statistical analysis was performed applying non-parametric procedures (Mann–Whitney U tests, error rates method). Data from 163 patients could be included in the analysis. RBL was significantly higher in male patients, older age groups, smokers, patients with high DMFT (decayed/missing/filled teeth) score, lower number of teeth, and high LDL-C levels (≥160 mg/dL). Furthermore, patients with high 25OHD levels (≥40 ng/mL) exhibited significantly less RBL. In summary, RBL was found to be associated with known patient-specific markers, particularly with age and high LDL-C levels.
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Affiliation(s)
- Teresa Thim
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, 93053 Regensburg, Germany; (T.T.); (K.J.S.); (K.-A.H.); (W.B.)
- Private Practice, 63110 Rodgau, Germany
| | - Konstantin Johannes Scholz
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, 93053 Regensburg, Germany; (T.T.); (K.J.S.); (K.-A.H.); (W.B.)
| | - Karl-Anton Hiller
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, 93053 Regensburg, Germany; (T.T.); (K.J.S.); (K.-A.H.); (W.B.)
| | - Wolfgang Buchalla
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, 93053 Regensburg, Germany; (T.T.); (K.J.S.); (K.-A.H.); (W.B.)
| | - Christian Kirschneck
- Department of Orthodontics, University Hospital Regensburg, 93053 Regensburg, Germany;
| | - Jonathan Fleiner
- Center of Dental Implantology, Periodontology and 3D-Imaging, 78462 Konstanz, Germany;
| | - Johan Peter Woelber
- Department of Operative Dentistry and Periodontology, Faculty of Medicine, University of Freiburg, 79085 Freiburg, Germany;
| | - Fabian Cieplik
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, 93053 Regensburg, Germany; (T.T.); (K.J.S.); (K.-A.H.); (W.B.)
- Correspondence:
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6
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Abstract
Bone regeneration is a central focus of maxillofacial research, especially when dealing with dental implants or critical sized wound sites. While bone has great regeneration potential, exogenous delivery of growth factors can greatly enhance the speed, duration, and quality of osseointegration, making a difference in a patient’s quality of life. Bone morphogenic protein 2 (BMP-2) is a highly potent growth factor that acts as a recruiting molecule for mesenchymal stromal cells, induces a rapid differentiation of them into osteoblasts, while also maintaining their viability. Currently, the literature data shows that the liposomal direct delivery or transfection of plasmids containing BMP-2 at the bone wound site often results in the overexpression of osteogenic markers and result in enhanced mineralization with formation of new bone matrix. We reviewed the literature on the scientific data regarding BMP-2 delivery with the help of liposomes. This may provide the ground for a future new bone regeneration strategy with real chances of reaching clinical practice.
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7
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Potential of Bone-Marrow-Derived Mesenchymal Stem Cells for Maxillofacial and Periodontal Regeneration: A Narrative Review. Int J Dent 2021; 2021:4759492. [PMID: 34795761 PMCID: PMC8594991 DOI: 10.1155/2021/4759492] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 09/19/2021] [Accepted: 10/25/2021] [Indexed: 12/11/2022] Open
Abstract
Bone-marrow-derived mesenchymal stem cells (BM-MSCs) are one of the most widely studied postnatal stem cell populations and are considered to utilize more frequently in cell-based therapy and cancer. These types of stem cells can undergo multilineage differentiation including blood cells, cardiac cells, and osteogenic cells differentiation, thus providing an alternative source of mesenchymal stem cells (MSCs) for tissue engineering and personalized medicine. Despite the ability to reprogram human adult somatic cells to induced pluripotent stem cells (iPSCs) in culture which provided a great opportunity and opened the new door for establishing the in vitro disease modeling and generating an unlimited source for cell base therapy, using MSCs for regeneration purposes still have a great chance to cure diseases. In this review, we discuss the important issues in MSCs biology including the origin and functions of MSCs and their application for craniofacial and periodontal tissue regeneration, discuss the potential and clinical applications of this type of stem cells in differentiation to maxillofacial bone and cartilage in vitro, and address important future hopes and challenges in this field.
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8
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Zhou J, Zhang Z, Joseph J, Zhang X, Ferdows BE, Patel DN, Chen W, Banfi G, Molinaro R, Cosco D, Kong N, Joshi N, Farokhzad OC, Corbo C, Tao W. Biomaterials and nanomedicine for bone regeneration: Progress and future prospects. EXPLORATION 2021; 1:20210011. [PMCID: PMC10190996 DOI: 10.1002/exp.20210011] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 08/12/2021] [Indexed: 06/14/2023]
Affiliation(s)
- Jun Zhou
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
| | - Zhongyang Zhang
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
| | - John Joseph
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
| | - Xingcai Zhang
- School of Engineering and Applied Sciences Harvard University Cambridge Massachusetts USA
- School of Engineering Massachusetts Institute of Technology Cambridge Massachusetts USA
| | - Bijan Emiliano Ferdows
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
- Pomona College Claremont California USA
| | - Dylan Neal Patel
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
- Jericho High School Jericho New York USA
| | - Wei Chen
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
| | - Giuseppe Banfi
- IRCCS Galeazzi Milano Italy
- Università Vita e Salute San Raffaele Milano Italy
| | | | - Donato Cosco
- Department of Health Science Campus Universitario‐Germaneto “Magna Græcia” University of Catanzaro Catanzaro Italy
| | - Na Kong
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
| | - Nitin Joshi
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
| | - Omid C. Farokhzad
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
| | - Claudia Corbo
- School of Medicine and Surgery Nanomedicine Center Nanomib University of Milano‐Bicocca Vedano al Lambro Italy
| | - Wei Tao
- Center for Nanomedicine and Department of Anesthesiology Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA
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9
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Sánchez-Fernández MJ, Peerlings M, Félix Lanao RP, Bender JCME, van Hest JCM, Leeuwenburgh SCG. Bone-adhesive barrier membranes based on alendronate-functionalized poly(2-oxazoline)s. J Mater Chem B 2021; 9:5848-5860. [PMID: 34254100 DOI: 10.1039/d1tb00502b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
To create a novel generation of barrier membranes with bone-adhesive properties, three-component membranes were successfully developed using a solvent-free approach by combining an occlusive polyester backing layer with a bone-adhesive fibrous gelatin carrier impregnated with calcium-binding alendronate-functionalized poly(2-oxazoline)s (POx-Ale). The mechanical properties of these novel membranes were similar to other commercially available barrier membranes. In contrast, the adhesion of our membranes towards bone was by far superior (i.e. 62-fold) compared to conventional commercially available Bio-Gide® membranes. Moreover, alendronate-functionalized membranes retained their bone-adhesive properties under wet conditions in phosphate-buffered saline (PBS) solutions with and without collagenase. Finally, the in vitro degradation of the membranes was studied by monitoring their weight loss upon immersion in PBS solutions with and without collagenase. The membranes degraded in a sustained manner, which was accelerated by the presence of collagenase due to enzymatic degradation of the carrier. In conclusion, our results show that surface functionalization of barrier membranes with alendronate moieties renders them adhesive to bone. As such, the biomaterials design strategy presented herein opens up new avenues of research on bone-adhesive membranes for guided bone regeneration.
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Affiliation(s)
- María J Sánchez-Fernández
- Department of Dentistry-Regenerative Biomaterials, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, 6525 EX Nijmegen, The Netherlands.
| | - Manon Peerlings
- Department of Dentistry-Regenerative Biomaterials, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, 6525 EX Nijmegen, The Netherlands.
| | | | | | - Jan C M van Hest
- Department of Bio-Organic Chemistry, Institute for Complex Molecular Systems, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Sander C G Leeuwenburgh
- Department of Dentistry-Regenerative Biomaterials, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, 6525 EX Nijmegen, The Netherlands.
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10
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Yao Y, Kauffmann F, Maekawa S, Sarment LV, Sugai JV, Schmiedeler CA, Doherty EJ, Holdsworth G, Kostenuik PJ, Giannobile WV. Sclerostin antibody stimulates periodontal regeneration in large alveolar bone defects. Sci Rep 2020; 10:16217. [PMID: 33004873 PMCID: PMC7530715 DOI: 10.1038/s41598-020-73026-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 09/08/2020] [Indexed: 02/06/2023] Open
Abstract
Destruction of the alveolar bone in the jaws can occur due to periodontitis, trauma or following tumor resection. Common reconstructive therapy can include the use of bone grafts with limited predictability and efficacy. Romosozumab, approved by the FDA in 2019, is a humanized sclerostin-neutralizing antibody (Scl-Ab) indicated in postmenopausal women with osteoporosis at high risk for fracture. Preclinical models show that Scl-Ab administration preserves bone volume during periodontal disease, repairs bone defects surrounding dental implants, and reverses alveolar bone loss following extraction socket remodeling. To date, there are no studies evaluating Scl-Ab to repair osseous defects around teeth or to identify the efficacy of locally-delivered Scl-Ab for targeted drug delivery. In this investigation, the use of systemically-delivered versus low dose locally-delivered Scl-Ab via poly(lactic-co-glycolic) acid (PLGA) microspheres (MSs) was compared at experimentally-created alveolar bone defects in rats. Systemic Scl-Ab administration improved bone regeneration and tended to increase cementogenesis measured by histology and microcomputed tomography, while Scl-Ab delivered by MSs did not result in enhancements in bone or cemental repair compared to MSs alone or control. In conclusion, systemic administration of Scl-Ab promotes bone and cemental regeneration while local, low dose delivery did not heal periodontal osseous defects in this study.
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Affiliation(s)
- Yao Yao
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109-2800, USA
| | - Frederic Kauffmann
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109-2800, USA
- Department of Oral and Craniomaxillofacial Surgery, Center for Dental Medicine, University Medical Center Freiburg, 79110, Freiburg, Germany
| | - Shogo Maekawa
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109-2800, USA
- Department of Periodontology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, 113-8510, Japan
| | - Lea V Sarment
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109-2800, USA
| | - James V Sugai
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109-2800, USA
| | - Caroline A Schmiedeler
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109-2800, USA
| | - Edward J Doherty
- Wyss Institute for Biologically Inspired Engineering at Harvard University, Cambridge, MA, 02115, USA
| | | | - Paul J Kostenuik
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA
| | - William V Giannobile
- Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, 48109, USA.
- Biointerfaces Institute, University of Michigan, Ann Arbor, MI, 48109-2800, USA.
- Department of Biomedical Engineering, College of Engineering, University of Michigan, Ann Arbor, MI, 48019, USA.
- Department of Oral Medicine, Infection, and Immunity, Harvard School of Dental Medicine, Boston, MA, 02115, USA.
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11
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Hattingh A, De Bruyn H, Van Weehaeghe M, Hommez G, Vandeweghe S. Contour Changes Following Immediate Placement of Ultra-Wide Implants in Molar Extraction Sockets without Bone Grafting. J Clin Med 2020; 9:jcm9082504. [PMID: 32759638 PMCID: PMC7464762 DOI: 10.3390/jcm9082504] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 07/24/2020] [Accepted: 07/31/2020] [Indexed: 01/18/2023] Open
Abstract
The aim was to evaluate ridge reduction and mucosal recession following immediate placement of ultra-wide implants in molar sockets, without bone grafting. Impressions were taken prior to tooth extraction, 4 months and 1 year after implant placement. The casts were digitized and compared. Mucosal recessions and horizontal ridge reduction were measured. A total of 16 implants were in the maxilla and 11 in the mandible. At the buccal aspect, there was a mean reduction of 0.94 mm after 4 months and 0.89 mm after one year (p = 0.933). At the palatal/lingual aspect, this was 1.09 mm after 4 months and 0.69 mm after 1 year (p = 0.001). After 1 year, a recession of 0.59 mm was measured at the zenith, 1.04 mm at the mesial and 0.98 mm at the distal papilla. The mean midfacial horizontal ridge reduction was 1.23 mm after 4 months and 1.45 mm after 1 year. At the midpalatal/midlingual aspect, the mean horizontal reduction was 1.43 mm after 4 months and 1.16 mm after 1 year. Immediate implant placement without bone grafting in the posterior jaw yields a significant horizontal ridge reduction and minor mucosal recession. Clinicians should anticipate the amount of ridge reduction and consider augmentation at the time of implant placement.
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Affiliation(s)
- André Hattingh
- Private Practice for Periodontology and Oral Implantology, Sevenoaks, Kent TN15 8BQ, UK;
- Oral Health Sciences, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium; (H.D.B.); (M.V.W.); (G.H.)
| | - Hugo De Bruyn
- Oral Health Sciences, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium; (H.D.B.); (M.V.W.); (G.H.)
- Dental Faculty, Radboud University Medical Hospital, 6525EX Nijmegen, The Netherlands
| | - Manù Van Weehaeghe
- Oral Health Sciences, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium; (H.D.B.); (M.V.W.); (G.H.)
| | - Geert Hommez
- Oral Health Sciences, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium; (H.D.B.); (M.V.W.); (G.H.)
| | - Stefan Vandeweghe
- Oral Health Sciences, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium; (H.D.B.); (M.V.W.); (G.H.)
- Correspondence: ; Tel.: +32-9-332-59-22
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Boda SK, Almoshari Y, Wang H, Wang X, Reinhardt RA, Duan B, Wang D, Xie J. Mineralized nanofiber segments coupled with calcium-binding BMP-2 peptides for alveolar bone regeneration. Acta Biomater 2019; 85:282-293. [PMID: 30605770 PMCID: PMC6679595 DOI: 10.1016/j.actbio.2018.12.051] [Citation(s) in RCA: 87] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 11/19/2018] [Accepted: 12/29/2018] [Indexed: 01/08/2023]
Abstract
Bone loss around tooth extraction sites can occur, thus making future placement of dental implants difficult. Alveolar bone regeneration can be guided by the application of a nanofibrous bone graft coupled with osteoinductive proteins/peptides, following tooth loss or tooth extraction. In the present study, we demonstrate the potential of mineralized nanofiber segments coupled with calcium-binding bone morphogenetic protein 2 (BMP-2) mimicking peptides for periodontal bone regeneration. Thin electrospun nanofiber membranes of PLGA-collagen-gelatin (2:1:1 wt ratios) were mineralized in 10× modified simulated body fluid (10× mSBF) and cryocut to segments of 20 µm. For predetermined weights of the mineralized nanofiber segments, it was possible to load various amounts of heptaglutamate E7-domain-conjugated BMP-2 peptide. Mineralized short fiber grafts (2 mg), with and without E7-BMP-2 peptides, were implanted into 2 mm × 2 mm (diameter × depth) critical-sized socket defects created in rat maxillae, following extraction of the first molar teeth. A sustained release profile of E7-BMP-2 from the mineralized nanofiber segments was recorded over 4 weeks. X-ray microcomputed tomography (µ-CT) analysis of peptide-loaded nanofiber graft filled defects revealed ∼3 times greater new bone volume and bone mineral density over 4 weeks in comparison to unfilled control defects. Further, histopathology data confirmed the formation of greater new osseous tissue in the BMP2 peptide-loaded, mineralized nanofiber segment group than that of fibrous connective tissue in the unfilled defect group. Altogether, the mineralized nanofiber segments coupled with E7-BMP-2 peptides may be an effective treatment option for alveolar bone loss and defects. STATEMENT OF SIGNIFICANCE: With the high incidence of dental implants/fixtures for missing teeth, the success of the surgical procedures in restorative dentistry is dictated by the quality and quantity of the supporting alveolar bone. To address the problem of alveolar bone loss and defects due to tumor, periodontitis, or even postextraction remodeling, the present study is the first report on the application of mineralized nanofiber fragments coupled with calcium-binding osteoinductive BMP-2 peptides as a synthetic graft material for oral bone regeneration. The ease of fabrication and application of cryocut mineralized nanofiber fragments as maxillofacial bone defect fillers present a promising alternative to the current dental bone graft formulations. Furthermore, the nanofiber segments may also be utilized for several biomedical applications including hemostasis, soft tissue engineering, and wound healing.
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Affiliation(s)
- Sunil Kumar Boda
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Yosif Almoshari
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Hongjun Wang
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Xiaoyan Wang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Richard A Reinhardt
- Department of Surgical Specialties, College of Dentistry, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Bin Duan
- Division of Cardiology, Department of Internal Medicine and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, NE 68198 United States
| | - Dong Wang
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Jingwei Xie
- Department of Surgery-Transplant and Mary & Dick Holland Regenerative Medicine Program, College of Medicine, University of Nebraska Medical Center, Omaha, Nebraska 68198, United States.
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Nguyen KCT, Pachêco-Pereira C, Kaipatur NR, Cheung J, Major PW, Le LH. Comparison of ultrasound imaging and cone-beam computed tomography for examination of the alveolar bone level: A systematic review. PLoS One 2018; 13:e0200596. [PMID: 30281591 PMCID: PMC6169851 DOI: 10.1371/journal.pone.0200596] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 06/30/2018] [Indexed: 02/01/2023] Open
Abstract
Background and objective The current methods to image alveolar bone in humans include intraoral 2D radiography and cone-beam computed tomography (CBCT). However, these methods expose the subject to ionizing radiation. Therefore, ultrasound imaging has been investigated as an alternative technique, as it is both non-invasive and free from ionizing radiation. In order to assess the validity and reliability of ultrasonography in visualizing alveolar bone, a systematic review was conducted comparing ultrasound imaging to CBCT for examination of the alveolar bone level. Study design Seven databases were searched. Studies addressing examination of alveolar bone level via CBCT and ultrasound were selected. Risk of bias under Cochrane guidelines was used as a methodological quality assessment tool. Results All the four included studies were ex vivo studies that used porcine or human cadaver samples. The alveolar bone level was measured by the distance from the alveolar bone crest to certain landmarks such as cemento-enamel junction or gingival margin. The risk of bias was found as low. The mean difference between ultrasound and CBCT measurements ranged from 0.07 mm to 0.68 mm, equivalent to 1.6% - 8.8%. Conclusions There is currently preliminary evidence to support the use of ultrasonography as compared to CBCT for the examination of alveolar bone level. Further studies comparing ultrasound to gold standard methods would be necessary to help validate the accuracy of ultrasonography as a diagnostic technique in periodontal imaging.
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Affiliation(s)
- Kim-Cuong T. Nguyen
- Department of Radiology & Diagnostic Imaging, University of Alberta, Edmonton, Alberta, Canada
- Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada
| | - Camila Pachêco-Pereira
- School of Dentistry, University of Alberta, Edmonton, Alberta, Canada
- Department of Comprehensive Dentistry, UT Health San Antonio, San Antonio, Texas, United States of America
| | - Neelambar R. Kaipatur
- School of Dentistry, University of Alberta, Edmonton, Alberta, Canada
- * E-mail: (LHL); (NRK)
| | - June Cheung
- Department of Communication Sciences and Disorders, University of Alberta, Edmonton, Alberta, Canada
| | - Paul W. Major
- School of Dentistry, University of Alberta, Edmonton, Alberta, Canada
| | - Lawrence H. Le
- Department of Radiology & Diagnostic Imaging, University of Alberta, Edmonton, Alberta, Canada
- Department of Biomedical Engineering, University of Alberta, Edmonton, Alberta, Canada
- * E-mail: (LHL); (NRK)
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14
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Liu M, Kurimoto P, Zhang J, Niu QT, Stolina M, Dechow PC, Feng JQ, Hesterman J, Silva MD, Ominsky MS, Richards WG, Ke H, Kostenuik PJ. Sclerostin and DKK1 Inhibition Preserves and Augments Alveolar Bone Volume and Architecture in Rats with Alveolar Bone Loss. J Dent Res 2018; 97:1031-1038. [PMID: 29617179 DOI: 10.1177/0022034518766874] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Alveolar bone is a mechanosensitive tissue that provides structural support for teeth. Alveolar bone loss is common with aging, menopause, tooth loss, and periodontitis and can lead to additional tooth loss, reduced denture fixation, and challenges in placing dental implants. The current studies suggest that sclerostin and DKK1, which are established osteocyte-derived inhibitors of bone formation, contribute to alveolar bone loss associated with estrogen ablation and edentulism in rats. Estrogen-deficient ovariectomized rats showed significant mandibular bone loss that was reversed by systemic administration of sclerostin antibody (SAB) alone and in combination with DKK1 antibody (DAB). Osteocytes in the dentate and edentulous rat maxilla expressed Sost (sclerostin) and Dkk1 (DKK1) mRNA, and molar extraction appeared to acutely increase DKK1 expression. In a chronic rat maxillary molar extraction model, systemic SAB administration augmented the volume and height of atrophic alveolar ridges, effects that were enhanced by coadministering DAB. SAB and SAB+DAB also fully reversed bone loss that developed in the opposing mandible as a result of hypo-occlusion. In both treatment studies, alveolar bone augmentation with SAB or SAB+DAB was accompanied by increased bone mass in the postcranial skeleton. Jaw bone biomechanics showed that intact sclerostin-deficient mice exhibited stronger and denser mandibles as compared with wild-type controls. These studies show that sclerostin inhibition, with and without DKK1 coinhibition, augmented alveolar bone volume and architecture in rats with alveolar bone loss. These noninvasive approaches may have utility for the conservative augmentation of alveolar bone.
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Affiliation(s)
- M Liu
- 1 Department of Cardiometabolic and Bone Disorders, Amgen Inc., Thousand Oaks, CA, USA
| | - P Kurimoto
- 1 Department of Cardiometabolic and Bone Disorders, Amgen Inc., Thousand Oaks, CA, USA
| | - J Zhang
- 1 Department of Cardiometabolic and Bone Disorders, Amgen Inc., Thousand Oaks, CA, USA.,Merck Research Labs, South San Francisco, CA, USA
| | - Q T Niu
- 1 Department of Cardiometabolic and Bone Disorders, Amgen Inc., Thousand Oaks, CA, USA
| | - M Stolina
- 1 Department of Cardiometabolic and Bone Disorders, Amgen Inc., Thousand Oaks, CA, USA
| | - P C Dechow
- 2 Baylor College of Dentistry, Texas A&M University, Dallas, TX, USA
| | - J Q Feng
- 2 Baylor College of Dentistry, Texas A&M University, Dallas, TX, USA
| | | | | | - M S Ominsky
- 1 Department of Cardiometabolic and Bone Disorders, Amgen Inc., Thousand Oaks, CA, USA.,Radius Health Inc., Waltham, MA, USA
| | - W G Richards
- 1 Department of Cardiometabolic and Bone Disorders, Amgen Inc., Thousand Oaks, CA, USA
| | - H Ke
- 1 Department of Cardiometabolic and Bone Disorders, Amgen Inc., Thousand Oaks, CA, USA.,4 UCB Pharma, Slough, UK
| | - P J Kostenuik
- 1 Department of Cardiometabolic and Bone Disorders, Amgen Inc., Thousand Oaks, CA, USA.,Phylon Pharma Services, Newbury Park, CA, USA, and School of Dentistry, University of Michigan, Ann Arbor, MI, USA
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15
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Acharya A, Hao J, Mattheos N, Chau A, Shirke P, Lang NP. Residual ridge dimensions at edentulous maxillary first molar sites and periodontal bone loss among two ethnic cohorts seeking tooth replacement. Clin Oral Implants Res 2013; 25:1386-94. [PMID: 25283689 DOI: 10.1111/clr.12292] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/23/2013] [Indexed: 01/12/2023]
Abstract
OBJECTIVES To study residual ridge dimensions at edentulous first molar sites in relation to periodontal bone loss among cohorts of partially edentulous Asian Indian and Hong Kong Chinese subjects seeking tooth replacement. MATERIALS AND METHODS A total of 628 edentulous maxillary first molar sites were analyzed on Cone Beam Computed Tomography scans of 225 Asian Indian (I) and 232 Hong Kong Chinese (C) partially edentulous adults seeking tooth replacement. Age, ethnicity, gender, total tooth loss, the presence or absence of adjacent teeth, categories of periodontal status defined according to radiographic alveolar bone loss (P0: periodontal health, P1: incipient to moderate disease, P2: severe periodontal disease) and sinus membrane abnormalities were noted. Alveolar ridge height (RH), widths at 1 and 3 mm from crest (RW1; RW3), and relative position of the bone crest (RR) were measured. RESULTS Prevalence of P2 status was most frequent in both cohorts(C: 50.4% I: 49.2%). P2 had lowest ridge heights; 13.1% C P2 and 14%I P2 had RH < 2 mm. Sites with both RH <8 mm and RW1 < 6 mm occurred at 59%C P2 and 68%I P2. Sinus membrane abnormalities were most frequent in P2. Periodontal status and sinus membrane abnormality increased the odds of RH <5 mm and RH <8 mm more than 2-fold; additionally, gender and ethnicity significantly impacted RH <8 mm. Gender and adjacent tooth status significantly affected RW1. CONCLUSION Incident advanced periodontal disease was common among Asian Indian and Hong Kong Chinese subjects seeking tooth replacement and associated with lower available bone heights. Ethnicity, gender, sinus membrane thickening affected available bone height in the subsinus region, while the presence of adjacent teeth- and age-affected residual ridge width.
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Affiliation(s)
- Aneesha Acharya
- Department of Implant Dentistry, Oral Rehabilitation, Faculty of Dentistry, University of Hong Kong, Hong Kong, SAR Hong Kong, China; Department of Periodontology and Oral Implantology, Dr D. Y. Patil Dental College and Hospital, D Y Patil Vidyapeeth, Pune, India
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16
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Dechow PC, Wang Q, Peterson J. Edentulation alters material properties of cortical bone in the human craniofacial skeleton: functional implications for craniofacial structure in primate evolution. Anat Rec (Hoboken) 2010; 293:618-29. [PMID: 20235319 DOI: 10.1002/ar.21124] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Skeletal adaptations to reduced function are an important source of skeletal variation and may be indicative of environmental pressures that lead to evolutionary changes. Humans serve as a model animal to investigate the effects of loss of craniofacial function through edentulation. In the human maxilla, it is known that edentulation leads to significant changes in skeletal structure such as residual ridge resorption and loss of cortical thickness. However, little is known about changes in bone tissue structure and material properties, which are also important for understanding skeletal mechanics but are often ignored. The aims of this study were to determine cortical material properties in edentulous crania and to evaluate differences with dentate crania and thus examine the effects of loss of function on craniofacial structure. Cortical bone samples from 15 edentulous human skulls were measured for thickness and density. Elastic properties and directions of maximum stiffness were determined by using ultrasonic techniques. These data were compared to those from dentate crania reported in a previous investigation. Cortical bone from all regions of the facial skeleton of edentulous individuals is thinner than in dentate skulls. Elastic and shear moduli, and density are similar or greater in the zygoma and cranial vault of edentulous individuals, whereas these properties are less in the maxilla. Most cortical bone, especially in edentulous maxillae, has reduced directional orientation. The loss of significant occlusal loads following edentulation may contribute to the change in material properties and the loss of orientation over time during the normal process of bone remodeling. These results suggest that area-specific cortical microstructural changes accompany bone resorption following edentulation. They also suggest that functional forces are important for maintaining bone mass throughout the craniofacial skeleton, even in areas such as the browridges, which have been thought to be little affected by function, because of low in vivo strains found there in several primate studies.
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Affiliation(s)
- Paul C Dechow
- Department of Biomedical Sciences, Texas A and M University, Health Science Center/Baylor College of Dentistry, 3302 Gaston Avenue, Dallas, TX 75246, USA.
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17
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Perugini P, Genta I, Conti B, Modena T, Cocchi D, Zaffe D, Pavanetto F. PLGA microspheres for oral osteopenia treatment: preliminary "in vitro"/"in vivo" evaluation. Int J Pharm 2003; 256:153-60. [PMID: 12695021 DOI: 10.1016/s0378-5173(03)00072-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of this work was to prepare and to evaluate "in vitro"/"in vivo" microspheres based on poly(D,L-lactide-co-glycolide) copolymers containing ipriflavone, for the local treatment of oral bone loss. The first objective was the preparation and "in vitro" characterization of ipriflavone loaded microspheres, by emulsion/solvent evaporation method. Process parameters such as drug:polymer weight ratio, and molecular weight of copolymers, were also investigated. The second objective was to elaborate a suitable animal model of mandibular osteoporosis, to evaluate the efficacy of these microparticulate drug delivery systems. "In vivo" experiments were carried out on female rats, in which oral osteopenia was induced by gonadectomy and molar avulsion. Morphometric analysis of mandibular segment were carried out to quantify the development of oral osteopenia and the efficacy of drug loaded microspheres. Results showed that ipriflavone loaded PLGA microspheres can be successfully obtained with good "in vitro" characteristics, utilizing the emulsification/solvent evaporation method. "In vivo" experiments revealed that local administration of microspheres produced only mild inflammation on the injection site. Morphometric analyses showed, at the level of the third molar, a slight increase in spongy and total bone mass on rat jaw treated with microspheres with respect to control. Control animals exhibited a scarce degree of osteopenia demonstrating that this animal model is not suitable for this purpose.
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Affiliation(s)
- P Perugini
- Department of Pharmaceutical Chemistry, University of Pavia, V.le Taramelli 12, 27100, Pavia, Italy
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18
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Mitsuta T, Horiuchi H, Shinoda H. Effects of topical administration of clodronate on alveolar bone resorption in rats with experimental periodontitis. J Periodontol 2002; 73:479-86. [PMID: 12027248 DOI: 10.1902/jop.2002.73.5.479] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
BACKGROUND We examined whether topical administration of a bisphosphonate clodronate could prevent alveolar bone loss in rats with experimental periodontitis. METHODS On day 0, elastic rings were placed around the cervix of the right and left maxillary first molars (M1) to induce inflammatory periodontitis. Fifty microl of clodronate solution at a concentration of either 0 (0.9% NaCl), 20, 40, or 60 mM was injected into the subperiosteal palatal area adjacent to the interdental area between M1 and M2 on either the left or right (experimental) side on days 0, 2, 4, and 6. The contralateral side served as a control and received 0.9% NaCl solution without clodronate. The animals were sacrificed on day 7. RESULTS Histological examination and determination of bone mineral density in the interdental alveolar bone area between M1 and M2 revealed that placement of an elastic ring caused severe vertical and horizontal bone resorption on the control side, while the topical administration of clodronate significantly prevented such alveolar bone loss. The number of osteoclasts on the experimental side was decreased compared with the control side. Furthermore, many of the osteoclasts on the experimental side were detached from the surface of the alveolar bone and had degenerated appearances, such as rounded shapes and a loss of polarity. CONCLUSIONS These results suggest that topical administration of clodronate may be effective in preventing osteoclastic bone resorption in periodontitis.
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Affiliation(s)
- T Mitsuta
- Department of Oral Rehabilitation and Materials Science, Tohoku University Graduate School of Dentistry, Sendai, Japan
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19
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Shimizu M, Furuya R, Kawawa T, Sasaki T. Bone wound healing after maxillary molar extraction in ovariectomized aged rats: quantitative backscattered electron image analysis. THE ANATOMICAL RECORD 2000; 259:76-85. [PMID: 10760746 DOI: 10.1002/(sici)1097-0185(20000501)259:1<76::aid-ar9>3.0.co;2-0] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The processes of bone wound healing after maxillary molar extraction in ovariectomized aged rats were examined by means of quantitative backscattered electron image analysis and energy-dispersive X-ray microanalysis. Six-month-old female rats were either sham-operated or underwent bilateral ovariectomy (OVX), and 60 days postoperatively, the maxillary first molars were extracted. On post-extraction days 7, 30, and 60, the dissected and resin-embedded maxillae were micromilled in the transverse direction through the extracted alveolar sockets, and new bone formation on the buccal maxillary bone surface and within the extracted alveolar sockets was examined. In both sham-operated control and OVX rats, new bone formation was recognized on the buccal bone surface, as well as within the extracted sockets, and increased daily through to day 60. In comparison to sham-operated controls, new bone formation in OVX rats was significantly decreased both on the buccal bone surface and within the extracted sockets. Our results suggest that bone wound healing by new bone formation after maxillary molar extraction is significantly decreased in OVX-induced osteoporosis.
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Affiliation(s)
- M Shimizu
- First Department of Prosthodontics, School of Dentistry, Showa University, 2-1-1 Kitasenzoku, Ohta-ku, Tokyo 145-8515, Japan
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20
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Johnson RB, Gilbert JA, Cooper RC, Dai X, Newton BI, Tracy RR, West WF, DeMoss TL, Myers PJ, Streckfus CF. Alveolar bone loss one year following ovariectomy in sheep. J Periodontol 1997; 68:864-71. [PMID: 9379331 DOI: 10.1902/jop.1997.68.9.864] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
There is little information concerning the incidence of alveolar bone loss in estrogen-deficient women. Ovariectomized sheep are valid models for study of the effects of estrogen deficiency on bone metabolism. The objective of this study was to compare alveolar bone loss in control (C) and ovariectomized sheep (OVX) at 3 and 12 months following surgery. OVX animals had decreased serum levels of 17-beta-estradiol and increased serum levels of osteocalcin, IL-6, and urinary levels of deoxypyridinoline which, taken together, suggest development of osteoporosis. The mean probing depths and percentage of sites with pocket depths 4 to 6 mm and > 6 mm were significantly greater in OVX than C at each time period and in OVX were significantly greater at 12 months that at 3 months. Gingival tissue interleukin-6 (IL-6) levels (but not the number of IL-6(+) cells) were elevated adjacent to deep periodontal pockets; however, there was no significant elevation of levels of the proinflammatory cytokines IL-1 beta and IL-8 within gingiva. Taken together, the data suggest a systemic contribution for progression of periodontal disease associated with estrogen deficiency. This may involve upregulation of systemic IL-6 synthesis and transfer to gingiva in serum, resulting in enhanced IL-6 accumulation within the gingival tissues or reduced bone density allowing for a greater amount of alveolar bone loss.
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Affiliation(s)
- R B Johnson
- Department of Periodontics, University of Mississippi School of Dentistry, Jackson, USA
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21
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Affiliation(s)
- M K Jeffcoat
- Department of Periodontics, University of Alabama School of Dentistry, Birmingham, USA
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22
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Abstract
Tests for periodontal disease fall into four categories. The test may identify putative periodontopathic plaque bacteria, the susceptible host, metabolic changes associated with inflammation, tissue damage or death or anatomic changes including periodontal probing and radiographs. The current understanding of tests for periodontal disease is reviewed within a framework for understanding the rationale for such tests.
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Affiliation(s)
- M K Jeffcoat
- Department of Periodontics, University of Alabama School of Dentistry, Birmingham
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Jeffcoat MK, Chesnut CH. Systemic osteoporosis and oral bone loss: evidence shows increased risk factors. J Am Dent Assoc 1993; 124:49-56. [PMID: 8227773 DOI: 10.14219/jada.archive.1993.0225] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Aging is associated with a loss of bone mass and an increased risk of oral and systemic bone loss. Systemic osteoporosis can result in bone fractures, especially of the spine and hip, with the characteristic spinal curvature and loss of height often seen in osteoporotic postmenopausal women. Loss of teeth and ridge resorption can occur in the mouth.
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Affiliation(s)
- M K Jeffcoat
- Department of Periodontics, University of Alabama School of Dentistry, Birmingham 35294
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