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Pires JLDS, de Carvalho JJ, Pereira MJDS, Brum IDS, Nascimento ALR, dos Santos PGP, Frigo L, Fischer RG. Repair of Critical Size Bone Defects Using Synthetic Hydroxyapatite or Xenograft with or without the Bone Marrow Mononuclear Fraction: A Histomorphometric and Immunohistochemical Study in Rat Calvaria. MATERIALS 2021; 14:ma14112854. [PMID: 34073482 PMCID: PMC8199028 DOI: 10.3390/ma14112854] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 04/23/2021] [Accepted: 05/19/2021] [Indexed: 11/16/2022]
Abstract
Bone defects are a challenging clinical situation, and the development of hydroxyapatite-based biomaterials is a prolific research field that, in addition, can be joined by stem cells and growth factors in order to deal with the problem. This study compares the use of synthetic hydroxyapatite and xenograft, used pure or enriched with bone marrow mononuclear fraction for the regeneration of critical size bone defects in rat calvaria through histomorphometric (Masson's staining) and immunohistochemical (anti-VEGF, anti-osteopontin) analysis. Forty young adult male rats were divided into five groups (n = 8). Animals were submitted to critical size bone defects (Ø = 8 mm) in the temporoparietal region. In the control group, there was no biomaterial placement in the critical bone defects; in group 1, it was filled with synthetic hydroxyapatite; in group 2, it was filled with xenograft; in group 3, it was filled with synthetic hydroxyapatite, enriched with bone marrow mononuclear fraction (BMMF), and in group 4 it was filled with xenograft, enriched with BMMF. After eight weeks, all groups were euthanized, and histological section images were captured and analyzed. Data analysis showed that in groups 1, 2, 3 and 4 (received biomaterials and biomaterials plus BMMF), a significant enhancement in new bone matrix formation was observed in relation to the control group. However, BMMF-enriched groups did not differ from hydroxyapatite-based biomaterials-only groups. Therefore, in this experimental model, BMMF did not enhance hydroxyapatite-based biomaterials' potential to induce bone matrix and related mediators.
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Affiliation(s)
- Jorge Luís da Silva Pires
- Department of Periodontology, PhD Candidate in Periodontology, School of Dentistry, State University of Rio de Janeiro, Rio de Janeiro 20551-030, Brazil
- Correspondence: ; Tel.: +55-21-986794126
| | - Jorge José de Carvalho
- Laboratory of Cell Ultrastructure and Tissue Biology, Department of Histology and Embryology, State University of Rio de Janeiro, Rio de Janeiro 20550-900, Brazil; (J.J.d.C.); (M.J.d.S.P.); (I.d.S.B.); (A.L.R.N.)
| | - Mario José dos Santos Pereira
- Laboratory of Cell Ultrastructure and Tissue Biology, Department of Histology and Embryology, State University of Rio de Janeiro, Rio de Janeiro 20550-900, Brazil; (J.J.d.C.); (M.J.d.S.P.); (I.d.S.B.); (A.L.R.N.)
| | - Igor da Silva Brum
- Laboratory of Cell Ultrastructure and Tissue Biology, Department of Histology and Embryology, State University of Rio de Janeiro, Rio de Janeiro 20550-900, Brazil; (J.J.d.C.); (M.J.d.S.P.); (I.d.S.B.); (A.L.R.N.)
| | - Ana Lucia Rosa Nascimento
- Laboratory of Cell Ultrastructure and Tissue Biology, Department of Histology and Embryology, State University of Rio de Janeiro, Rio de Janeiro 20550-900, Brazil; (J.J.d.C.); (M.J.d.S.P.); (I.d.S.B.); (A.L.R.N.)
| | - Paulo Gonçalo Pinto dos Santos
- Department of Periodontology, School of Dentistry, State University of Rio de Janeiro, Rio de Janeiro 20551-030, Brazil; (P.G.P.d.S.); (R.G.F.)
| | - Lucio Frigo
- Department of Periodontology, School of Dentistry, Universidade Guarulhos, Guarulhos 07023-070, Brazil;
| | - Ricardo Guimaraes Fischer
- Department of Periodontology, School of Dentistry, State University of Rio de Janeiro, Rio de Janeiro 20551-030, Brazil; (P.G.P.d.S.); (R.G.F.)
- Department of Periodontology, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451-900, Brazil
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Polo CI, Sendyk WR, Correa L, Sendyk D, Deboni MCZ, Naclério-Homem MDG. Synergism between recombinant human bone morphogenetic protein 2/absorbable collagen sponge and bone substitutes favors vertical bone augmentation and the resorption rate of the biomaterials: Histomorphometric and 3D microcomputed tomography analysis. J Periodontol 2020; 91:1295-1306. [PMID: 32052436 DOI: 10.1002/jper.19-0571] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 01/25/2020] [Accepted: 01/28/2020] [Indexed: 11/06/2022]
Abstract
BACKGROUND Recombinant human bone morphogenetic protein 2 (rhBMP-2) is an osteoinductor frequently used for bone regeneration in oral and maxillofacial surgery. There is no consensus about the ideal carrier for this growth factor. The aim of this study was to compare the bone augmentation, bone microarchitecture, and biodegradation rate of additional carriers to rhBMP-2/absorbable collagen sponge (ACS) in a vertical guided bone regeneration model. METHODS Four titanium cylinders were fixed onto the calvaria of rabbits (n = 20) that received (n = 10) or not (n = 10) rhBMP-2/ACS in conjunction with one of the carriers: beta-tricalcium phosphate (β-TCP), biphasic calcium phosphate (BCP), bovine bone mineral (BBM) or blood clot. The samples were analyzed by means of microcomputed tomography and histomorphology after 14 weeks. RESULTS All the materials with rhBMP-2/ACS exhibited improvement on bone augmentation, mainly BCP (P = 0.033) and β-TCP (P = 0.038), in the upper portion of the cylinder. Although trabecular anisotropy was improved in all the materials groups, trabecular connectivity was diminished when the biomaterials received rhBMP-2/ACS. Resorption rate of the remaining biomaterial was improved by rhBMP-2/ACS, mainly in BBM (P <0.01) and β-TCP (P <0.01). BBM exhibited the highest osteoclast density compared with the other materials groups. CONCLUSIONS BCP and β-TCP biomaterials exhibited a synergic effect with rhBMP-2/ACS, acting as suitable and viable carriers for vertical bone augmentation. The addition of rhBMP-2 significantly affected the biodegradation of β-TCP and BBM, accelerating the resorption of these materials.
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Affiliation(s)
- Cristiane Ibanhes Polo
- Department of Oral and Maxillofacial Surgery and Traumatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
| | - Wilson Roberto Sendyk
- Department of Implantology, School of Dentistry, Santo Amaro University (UNISA), São Paulo, Brazil
| | - Luciana Correa
- Department of Stomatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
| | - Daniel Sendyk
- Department of Oral and Maxillofacial Surgery and Traumatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
| | - Maria Cristina Zindel Deboni
- Department of Oral and Maxillofacial Surgery and Traumatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
| | - Maria da Graça Naclério-Homem
- Department of Oral and Maxillofacial Surgery and Traumatology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil
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Bone Formation in Grafts with Bio-Oss and Autogenous Bone at Different Proportions in Rabbit Calvaria. Int J Dent 2020; 2020:2494128. [PMID: 32148500 PMCID: PMC7049819 DOI: 10.1155/2020/2494128] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 01/24/2020] [Indexed: 11/17/2022] Open
Abstract
Background The aim of this study was to assess the volumetric stability and bone formation in grafts with Bio-Oss and autogenous bone at different proportions in rabbit calvaria. Material and Methods. Ten rabbits received four titanium cylinders in their calvaria and randomly divided into the following groups: Group I: Bio-Oss (100%), Group II: Bio-Oss (75%) + autogenous bone (25%), Group III: Bio-Oss (50%) + autogenous bone (50%), and Group IV: autogenous bone (100%). After twelve weeks, the animals were euthanized, and samples were collected for clinical and histological analysis. Results Clinical analysis showed that Groups I (90.43 ± 8.99) and II (90.87 ± 7.43) had greater dimensional stability compared to Group IV (P=0.0005). Histologically, Groups I, II, and III showed areas of bone formation with particles of biomaterial remaining in close contact with the newly formed bone. However, there were no significant differences between the groups regarding the newly formed bone area. Conclusion It was concluded that the use of Bio-Oss either alone or associated with the autogenous bone at a proportion of 25% showed superior dimensional stability compared to the use of autogenous bone in the proposed experimental model.
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Cohen DJ, Scott KM, Kulkarni AN, Wayne JS, Boyan BD, Schwartz Z. Acellular mineralized allogenic block bone graft does not remodel during the 10 weeks following concurrent implant placement in a rabbit femoral model. Clin Oral Implants Res 2019; 31:37-48. [PMID: 31545532 DOI: 10.1111/clr.13544] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 07/22/2019] [Accepted: 09/08/2019] [Indexed: 10/25/2022]
Abstract
OBJECTIVES Due to bone loss, endosseous implants often require addition of a bone graft to support adequate primary fixation, bone regeneration, and osseointegration. The aim of this study was to compare effectiveness of autogenic and allogenic bone grafts when used during simultaneous insertion of the implant. MATERIALS AND METHODS 4-mm-diameter rabbit diaphyseal bone autografts or allografts (n = 16/group) with a 3.2-mm pre-drilled hole in the center were placed into a 4 mm defect in the proximal femur of 3.5 kg male New Zealand White rabbits. Machined 3.2 × 10 mm grit-blasted, acid-etched titanium-aluminum-vanadium (Ti6Al4V) implants were placed. Control implants were placed into progressively drilled 3.2-mm holes in the contralateral limbs. Post-insertion day 70, samples were analyzed by micro-CT and calcified histology, or by mechanical torque and push-out testing followed by decalcified histology. RESULTS Both grafts were integrated with the native bone. Micro-CT showed less bone volume (BV) and bone volume/total volume (BV/TV) in the allograft group, but histology showed no differences in BV or BV/TV between groups. Allograft lacked living cells, whereas autograft was cellularized. No difference was found in maximum removal torque between groups. Compressive loading at the graft-to-bone interface was significantly lower in allograft compared with autograft groups. CONCLUSIONS There was less bone in contact with the implant and significantly less maximum compressive load in the allograft group compared with autograft. The allograft remained acellular as demonstrated by empty lacunae. Taken together, block allograft implanted simultaneously with an implant produces a poorer quality bone compared with autograft.
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Affiliation(s)
- D Joshua Cohen
- College of Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Kayla M Scott
- College of Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Aniket N Kulkarni
- College of Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Jennifer S Wayne
- College of Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Barbara D Boyan
- College of Engineering, Virginia Commonwealth University, Richmond, VA, USA.,Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Zvi Schwartz
- College of Engineering, Virginia Commonwealth University, Richmond, VA, USA.,Department of Periodontics, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
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Lima JLDO, Sendyk DI, Sendyk WR, Polo CI, Correa L, Deboni MCZ. Growth Dynamic of Allogeneic and Autogenous Bone Grafts in a Vertical Model. Braz Dent J 2018; 29:325-334. [PMID: 30462757 DOI: 10.1590/0103-6440201801994] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Accepted: 04/13/2018] [Indexed: 01/05/2023] Open
Abstract
Several techniques have been proposed for vertical bone regeneration, and many of them use bone autogenous and allogeneic grafts. The purpose of this study was to compare demineralised freeze-dried bone allografts (DFDBA), fresh-frozen (FF) allografts, autogenous bone grafts to find differences between volumetric and histological quantity of bone formation and vertical bone growth dynamic. A vertical tissue regeneration bone model was performed in rabbit calvarias under general anaesthesia. Four hollow cylinders of pure titanium were screwed onto external cortical bone calvarias in eight rabbits. Each one of the cylinders was randomly filled with one intervention: DFDBA, FF, autogenous bone, or left to be filled with blood clot (BC) as control. Allogeneic grafts were obtained from a ninth animal following international standardised protocols for the harvesting, processing, and cryopreservation of allografts. Autogenous graft was obtained from the host femur scraping before adapting hollow cylinders. Animals were euthanized at 13 weeks. Vertical volume was calculated after probe device measurements of the new formed tissue inside the cylinders and after titanium cylinders were removed. Histomorphometry and fluorochrome staining were used to analyse quantity and dynamic of bone formation, respectively. Results showed that DFDBA and fresh-frozen bone improved the velocity and the quantity of bone deposition in distant portions of the basal plane of grafting. Remaining material in allograft groups was more intense than in autogenous group. Both allografts can be indicated as reliable alternatives for volume gain and vertical bone augmentation.
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Affiliation(s)
| | - Daniel Isaac Sendyk
- Oral Surgery Department, School of Dentistry, USP - Universidade de São Paulo, São Paulo, SP, Brazil
| | - Wilson Roberto Sendyk
- Oral Implantology Department, School of Dentistry, UNISA - Universidade de Santo Amaro, São Paulo, SP, Brazil
| | - Cristiane Ibanhes Polo
- Oral Surgery Department, School of Dentistry, USP - Universidade de São Paulo, São Paulo, SP, Brazil
| | - Luciana Correa
- Stomatology Department, School of Dentistry, USP - Universidade de São Paulo, São Paulo, SP, Brazil
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Use of Bone Marrow Aspirate Concentrate (BMAC) Associated with Hyperbaric Oxygenation Therapy in Maxillary Appositional Bone Reconstruction. A Randomized Clinical Trial. Symmetry (Basel) 2018. [DOI: 10.3390/sym10100533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
Objectives: The objective of this study was to evaluate bone reconstruction using xenograft alone and associated with bone marrow aspirate concentrate (BMAC) and hyperbaric oxygen therapy. Material and Methods: Twenty-four maxillary edentulous patients were randomly assigned into three groups: Control group (CG)—xenograft bone alone (n = 8); Group 1 (G1)—xenogeneic bone block combined with BMAC (n = 8), and Group 2 (G2)—xenogeneic bone block combined with BMAC and hyperbaric oxygenation (n = 8). Bone biopsies were harvested 6 months after grafting. Vital Mineralized Tissue (VMT), Non-vital Mineralized Tissue (NVMT), and Non-Mineralized Tissue (NMT) were measured. Computed tomography was also performed on three occasions T0 (preoperative), T4 (4 months postoperative), and T8 (8 months postoperative). The difference between T4 and T8 values with respect to T0 was used to determine the thickness level gain after 4 and 8 months, respectively. Results: The tomographic evaluation did not show significant differences between the groups either at 4 or at the 8 months postoperatively. Regarding the histomorphometric analysis, CG had the lowest percentages of VMT (36.58 ± 9.56%), whereas G1 and G2 had similar results (55.64 ± 2.83% and 55.30 ± 1.41%, respectively). Concerning NMT and NVMT levels, the opposite was observed, with CG levels of 51.21 ± 11.54% and 11.16 ± 2.37%, G1 of 39.76 ± 11.48% and 3.65 ± 0.87%, and G2 of 40.3 ± 11.48% and 4.10 ± 0.87%, respectively. Conclusions: The use of bone block xenograft associated with BMAC resulted in a significant increase of bone neoformation when compared to the xenograft alone, though hyperbaric oxygenation did not enhance the results.
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Coutinho LF, Amaral JBD, Santos ÉBD, Martinez EF, Montalli VAM, Junqueira JLC, Araújo VCD, Napimoga MH. Presence of Cells in Fresh-Frozen Allogeneic Bone Grafts from Different Tissue Banks. Braz Dent J 2018; 28:152-157. [PMID: 28492743 DOI: 10.1590/0103-6440201701206] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 01/04/2017] [Indexed: 11/22/2022] Open
Abstract
Bone replacement materials have been widely used to reconstruct atrophic jawbones. Based on previous reports demonstrating the presence of viable cells in bone blocks even after processing by musculoskeletal tissue banks for orthopedic use, the aim of this study was to evaluate the presence of cells in bone blocks from three Brazilian tissue banks for maxillary reconstructions. All samples were processed by the respective tissue banks, according to the guidelines of the Brazilian National Sanitary Surveillance Agency. Three samples were removed from each block for subsequent histological processing and stained using hematoxylin & eosin. Further evaluation included section staining by the Feulgen method and ultrastructural analysis using scanning electron microscopy (SEM). Light microscopy images from all bone samples showed presence of osteocyte-like cells in all groups and intense Feulgen staining, demonstrating presence of DNA in bone even after tissue processing. The ultrastructural analysis showed red blood cells in lacunae within the bone tissue. In conclusion, despite bone tissue processing by the musculoskeletal tissue banks, cells may be found within the bone used for allogeneic grafts.
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Ribeiro M, Fraguas EH, Brito KIC, Kim YJ, Pallos D, Sendyk WR. Bone autografts & allografts placed simultaneously with dental implants in rabbits. J Craniomaxillofac Surg 2018; 46:142-147. [DOI: 10.1016/j.jcms.2017.11.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 09/26/2017] [Accepted: 11/02/2017] [Indexed: 12/18/2022] Open
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HLA-typing analysis following allogeneic bone grafting for sinus lifting. Cell Tissue Bank 2016; 18:75-81. [DOI: 10.1007/s10561-016-9594-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 10/21/2016] [Indexed: 12/18/2022]
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Deluiz D, Santos Oliveira L, Ramôa Pires F, Reiner T, Armada L, Nunes MA, Muniz Barretto Tinoco E. Incorporation and Remodeling of Bone Block Allografts in the Maxillary Reconstruction: A Randomized Clinical Trial. Clin Implant Dent Relat Res 2016; 19:180-194. [DOI: 10.1111/cid.12441] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 06/30/2016] [Accepted: 07/11/2016] [Indexed: 11/27/2022]
Affiliation(s)
- Daniel Deluiz
- Postdoctoral researcher, Department of Periodontology; State University of Rio de Janeiro; RJ, Rio de Janeiro Brazil
| | - Luciano Santos Oliveira
- Professor, Department of Implantology; Pontifical Catholic University of Rio de Janeiro; Rio de Janeiro RJ Brazil
| | - Fábio Ramôa Pires
- Professor, Department of Stomatology, Estácio de Sá University; Rio de Janeiro RJ Brazil
| | - Teresita Reiner
- Investigator, Geriatric Research, Education and Clinical Center - Bruce W. Carter Veterans Affairs Medical Center; Miami FL USA
| | - Luciana Armada
- Professor, Department of Endodontics, Estácio de Sá University; Rio de Janeiro RJ Brazil
| | - Marcus A. Nunes
- Professor, Department of Statistics, Federal University of Rio Grande do Norte; Natal RN Brazil
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Zizzari VL, Zara S, Tetè G, Vinci R, Gherlone E, Cataldi A. Biologic and clinical aspects of integration of different bone substitutes in oral surgery: a literature review. Oral Surg Oral Med Oral Pathol Oral Radiol 2016; 122:392-402. [PMID: 27496576 DOI: 10.1016/j.oooo.2016.04.010] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2016] [Accepted: 04/12/2016] [Indexed: 12/21/2022]
Abstract
Many bone substitutes have been proposed for bone regeneration, and researchers have focused on the interactions occurring between grafts and host tissue, as the biologic response of host tissue is related to the origin of the biomaterial. Bone substitutes used in oral and maxillofacial surgery could be categorized according to their biologic origin and source as autologous bone graft when obtained from the same individual receiving the graft; homologous bone graft, or allograft, when harvested from an individual other than the one receiving the graft; animal-derived heterologous bone graft, or xenograft, when derived from a species other than human; and alloplastic graft, made of bone substitute of synthetic origin. The aim of this review is to describe the most commonly used bone substitutes, according to their origin, and to focus on the biologic events that ultimately lead to the integration of a biomaterial with the host tissue.
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Affiliation(s)
| | - Susi Zara
- Department of Pharmacy, University "G. d'Annunzio", Chieti, Italy
| | - Giulia Tetè
- Dental School, Vita-Salute University and Department of Dentistry, IRCCS San Raffaele Hospital, Milan, Italy
| | - Raffaele Vinci
- Dental School, Vita-Salute University and Department of Dentistry, IRCCS San Raffaele Hospital, Milan, Italy
| | - Enrico Gherlone
- Dental School, Vita-Salute University and Department of Dentistry, IRCCS San Raffaele Hospital, Milan, Italy
| | - Amelia Cataldi
- Department of Pharmacy, University "G. d'Annunzio", Chieti, Italy
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de Lacerda PE, Pelegrine AA, Teixeira ML, Montalli VAM, Rodrigues H, Napimoga MH. Homologous transplantation with fresh frozen bone for dental implant placement can induce HLA sensitization: a preliminary study. Cell Tissue Bank 2016; 17:465-72. [DOI: 10.1007/s10561-016-9562-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2016] [Accepted: 04/29/2016] [Indexed: 10/21/2022]
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Histological evaluation of fresh frozen bone integration at different experimental times. J Craniofac Surg 2015; 24:836-40. [PMID: 23714892 DOI: 10.1097/scs.0b013e31827c9de4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
The aim of this work was to investigate, through histological evaluation, the in vivo behavior of fresh frozen bone (FFB) used as particulate bone substitute in intraoral regenerative procedures. A total of 10 patients (group 1) received particulate FFB graft for bone regeneration in postextractive sockets, and 10 (group 2) underwent maxillary sinus augmentation by using the same bone substitute as filling. Fresh frozen bone was supplied from the Tissue Bank of the Veneto Region, Treviso Section.Healing was uneventful for all the patients and was monitored by periodical radiographs. Patients were scheduled for implant insertion according to the radiographic aspect. However, the mean healing time for group 1 was 45 days, whereas for group 2 patients, it was 100 days. At the moment of implant insertion, bone specimens were collected at the site of implant placement, from both groups and processed for histological analysis.Histological analysis after hematoxylin-eosin staining obtained from group 1 patients showed the presence of newly formed bone tissue, still well distinguishable from the grafted bone substitute. In samples from group 2 patients, a better integration could be recognized associated with active bone remodeling phenomena.These results showed a good integration of the considered FFB graft within the host tissue both at 45 and 100 days after grafting, displaying this biomaterial as suitable for preimplant regenerative procedures.
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Prosthetic Rehabilitation Using Short Dental Implants Associated With Homogenous Bone Graft. J Craniofac Surg 2015; 26:946-50. [DOI: 10.1097/scs.0000000000001369] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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The Use of Computer-Guided Flapless Dental Implant Surgery (NobelGuide) and Immediate Function to Support a Fixed Full-ArchProsthesis inFresh-Frozen Homologous Patients with Bone Grafts. J Craniofac Surg 2013; 24:e551-8. [DOI: 10.1097/scs.0b013e31829ac8e2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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16
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de Oliveira EMF, Martinez EF, Bossonaro JP, Ribeiro RC, de Araújo VC, Napimoga MH. In-vitro analysis of rhBMP-2 effects in human osteogenic cells. Can J Physiol Pharmacol 2013; 91:929-34. [PMID: 24117260 DOI: 10.1139/cjpp-2013-0080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study evaluated the in vitro expression of bone-related proteins by osteoblasts in the presence of different concentrations of human recombinant bone morphogenetic protein-2 (rhBMP-2). Immortalized human fetal osteoblastic cell line 1.19 (hFOB) were exposed to different concentrations of rhBMP-2 (10, 50, or 100 ng/mL) for 72 h. Cell proliferation and viability (MTT assay), as well as the expression of fibronectin, osteonectin, and osteopontin were assessed by indirect immunofluorescence and Western blot. Neither of the 3 concentrations of rhBMP-2 caused statistically significant alterations in cell proliferation and viability, although the concentration of 100 ng/mL showed lower values for both assays after both 48 and 72 h of exposure. There was no alteration in the expression of noncollagenous proteins, as analyzed by immunofluorescence, when compared with the control group. Furthermore, in the Western blot assay we observed a statistically significant decrease in fibronectin and osteonectin at 100 ng rhBMP-2/mL (p < 0.05) by comparison with the medium alone. The expression of osteopontin decreased slightly in all 3 concentrations of rhBMP-2 tested; however, the change was not statistically significant (p > 0.05). In this in-vitro study, the tested concentrations of rhBMP-2 appeared to decrease the expression of important bone-related molecules in pre-osteoblast cells.
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Affiliation(s)
- Eder M F de Oliveira
- a Laboratory of Immunology and Molecular Biology, São Leopoldo Mandic Institute and Research Center, Campinas, São Paulo, Brazil
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Deluiz D, Oliveira LS, Pires FR, Tinoco EMB. Time-dependent changes in fresh-frozen bone block grafts: tomographic, histologic, and histomorphometric findings. Clin Implant Dent Relat Res 2013; 17:296-306. [PMID: 23837530 DOI: 10.1111/cid.12108] [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] [Indexed: 11/28/2022]
Abstract
BACKGROUND Bone allografts have shown satisfactory clinical results in alveolar ridge reconstructions. However, the process of incorporation and the resorption rates of these grafts are not yet fully understood. PURPOSE The aim of this study was to use computed tomography (CT), histology, and histomorphometry to assess the time-dependent rates of resorption and incorporation of fresh-frozen bone allografts. MATERIALS AND METHODS Twenty-four patients underwent alveolar ridge reconstruction with bone block allografts and were randomly allocated to three groups with different graft healing periods (4, 6, or 8 months) before implant placement. To assess the resorption rates, CT scans were acquired within 7 days after bone graft surgery and at the end of the period. Graft samples were collected and sent for histological and histomorphometric analyses. RESULTS The graft resorption mean rates were 50.78% ± 10.43, 32.77% ± 7.84, and 13.02% ± 3.86 for the 4-, 6-, and 8-month groups, respectively, and were significantly different among the three groups. Newly formed bone with osteocytes near the grafted bone was observed in all three groups. The number of osteocytes was significantly lower at 4 months. Grafted bone remains were significantly higher in the shortest period of time. All of the grafts showed large amounts of calcified tissue. CONCLUSIONS All three groups showed new bone formation and different bone resorption rates. Graft healing periods of 4 months showed less graft resorption and seemed to be the most favorable for implant placement. Healing periods of 8 months showed the largest rate of graft resorption, which could render the grafts unfavorable for implant placement.
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Affiliation(s)
- Daniel Deluiz
- Department of Periodontology, UERJ - Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
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Behfarnia P, Shahabooei M, Mashhadiabbas F, Fakhari E. Comparison of bone regeneration using three demineralized freeze-dried bone allografts: A histological and histomorphometric study in rabbit calvaria. Dent Res J (Isfahan) 2013; 9:554-60. [PMID: 23559919 PMCID: PMC3612191 DOI: 10.4103/1735-3327.104873] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Background: It has been stated that the bone allografts from different tissue banks may lead to various amount of bone induction, so the aim of this study was to evaluate bone regeneration of three demineralized allografts both histologically and histomorphometrically in rabbits calvaria bone defects. Materials and Methods: In this double-blind randomized experimental animal study, 32 critical size defects (11-mm diameter) in the calvaria of 16 male New Zealand white rabbits were randomly filled with three demineralized freeze-dried bone allografts (DBM, CENOBONE, DEMBONE), while the nongrafted defect was regarded as control group. After 6 and 12 weeks of healing, the experimental animals were euthanized for specimen preparation. After histological evaluation, histomorphometric analysis was performed to quantify new bone formation and remained graft particles. The data were analyzed by one-way ANOVA with Tukey's ad-hoc test and t-test. (P < 0.05 was considered to be statistically significant). Results: Mean percentage of bone formation increased between two healing time, but it was not statistically significant in all groups except DBM which the bone formation significantly decreased (P = 0.04). There were not statistically significant differences between three allografts in remained particles and bone formation in both healing times and they could not induce significantly more bone formation than control group. Conclusion: Both test and control groups resulted in successful new bone formation. No difference was noted in bone formation and remained particles between three commercial bone allografts. Further studies in this issue may be needed.
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Affiliation(s)
- Parichehr Behfarnia
- Torabinejad Dental Research Center and Department of Periodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
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Reconstruction of the edentulous mandible with fresh frozen bone grafts and implants: a 4-year report of a prospective clinical study. Cell Tissue Bank 2012. [DOI: 10.1007/s10561-012-9352-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Xenograft enriched with autologous bone marrow in inlay reconstructions: a tomographic and histomorphometric study in rabbit calvaria. Int J Biomater 2012; 2012:170520. [PMID: 22973313 PMCID: PMC3437679 DOI: 10.1155/2012/170520] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 07/23/2012] [Indexed: 12/28/2022] Open
Abstract
Objective. The aim of this study was to evaluate the bone healing after the usage of a scaffold enriched with bone marrow. Study Design. Ten rabbits were divided into 2 groups of 5 animals. Bilateral 12 mm diameter defects were created in the parietal bones. In control group Bio-Oss were inserted in both defects and, in experimental group, Bio-Oss enriched with autologous bone marrow were inserted in both defects. In these two groups, one of the calvarial defects was covered with Bio-Gide. The rabbits were sacrified 8 weeks after surgery and both CT and histomorphometric analysis were done. Results. The CT showed a lower remaining defect area in the experimental group covered with Bio-Gide when compared with control group, with and without Bio-Gide. The histomorphometrics showed no difference between groups regarding the non-vital mineralized tissue area. For vital mineralized tissue area, the experimental group covered with Bio-Gide obtained a higher percentage area when compared with control group, with and without Bio-Gide. For non-mineralized tissue area, the experimental group covered with Bio-Gide obtained a lower percentage area when compared with control group, with and without Bio-Gide. Conclusion. Both autologous bone marrow and membrane can contribute to the enhancement of bone healing.
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Fraguas E, Ribeiro M, Croci A, Santos L, Pallos D, Sendyk W. Stability of implants placed simultaneously or in a delayed manner on fresh frozen onlay allografts in rabbits. Clin Oral Implants Res 2012; 24:1295-9. [PMID: 22905701 DOI: 10.1111/j.1600-0501.2012.02572.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/29/2012] [Indexed: 12/01/2022]
Affiliation(s)
| | - Marna Ribeiro
- Department of Peridontics and Implantology; UNISA; São Paulo Brazil
| | - Alberto Croci
- Hospital das Clínicas of the School of Medicine of the University of São Paulo; Tissue Bank Medical Director; São Paulo Brazil
| | - Luiz Santos
- Institute of Orthopedics and Traumatology; Hospital das Clínicas of the School of Medicine; University of São Paulo; São Paulo Brazil
| | - Débora Pallos
- Department of Peridontics and Implantology; UNISA; São Paulo Brazil
| | - Wilson Sendyk
- Department of Peridontics and Implantology; UNISA; São Paulo Brazil
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Polo CI, Lima JLO, De Lucca L, Piacezzi CB, Naclério-Homem MDG, Arana-Chavez VE, Sendyk WR. Effect of recombinant human bone morphogenetic protein 2 associated with a variety of bone substitutes on vertical guided bone regeneration in rabbit calvarium. J Periodontol 2012; 84:360-70. [PMID: 22524330 DOI: 10.1902/jop.2012.110674] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
BACKGROUND A major challenge for dental implantology is to consistently obtain appropriate bone augmentation before implant placement. The aim of this study is to evaluate the effect of recombinant human bone morphogenetic protein 2 (rhBMP-2) associated with bone substitute materials beta-tricalcium phosphate (β-TCP), biphasic calcium phosphate (BCP), and bovine bone mineral on vertical guided bone regeneration (GBR) in rabbit calvarium. METHODS Four titanium cylinders were fixed to the calvarium of 22 rabbits. In group 1 (n = 10), three cylinders were randomly filled with one of the test materials, and one cylinder was filled with a blood clot (CL). In group 2 (n = 12), the cylinders were randomly assigned to the same materials and CL but with the addition of rhBMP-2. Bone labels were injected over the course of 13 weeks, and euthanasia was performed 14 weeks after surgery in both groups. RESULTS The mean volume and area of tissue growth was greater in group 2 (with rhBMP-2) than in group 1 (without rhBMP-2), irrespective of the material used (P <0.001). The mean volume of tissue growth in the CL cylinder was smaller than that observed with all other materials (P <0.001) in both groups. The mean area of regenerated bone in the CL cylinder was smaller than that observed in the β-TCP cylinder (P = 0.028). The histologic study revealed more lamellar bone in the rhBMP-2 group, with a greater level of biodegradation of all the bone substitute materials tested. CONCLUSION The use of rhBMP-2/absorbable collagen sponge (ACS) combined with all of the bone substitute materials tested resulted in a greater amount of bone formation than that produced with the bone substitute materials alone or rhBMP-2/(ACS) and CL using the rabbit calvarium GBR model.
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Affiliation(s)
- Cristiane Ibanhes Polo
- Department of Oral and Maxillofacial Surgery and Traumatology, School of Dentistry, University of São Paulo, São Paulo, SP, Brazil.
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