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1.
Shanghai Kou Qiang Yi Xue ; 29(3): 316-320, 2020 Jun.
Artigo em Chinês | MEDLINE | ID: mdl-33043352

RESUMO

PURPOSE: To investigate the effect of autologous concentrated growth factor fibrin solution combined with Bio-Oss bone powder on mucosal healing and bone regeneration after oral implanted guided bone regeneration. METHODS: From October 2016 to December 2018, 83 patients with maxillary single anterior tooth loss and labial bone defect were treated, they were divided into two groups. Patients in the experimental group (42 cases) received autologous concentrated growth factor fibrin solution + Bio-Oss bone powder, while patients in the control group (41 cases) received Bio-Oss bone powder alone. The degree of mucosal healing, implant success, bone defect regeneration, pain and other complications were followed up 7 days, 6 weeks and 1 year after operation. The success rate and complications of the two groups were observed, as well as the differences of mucosal color, swelling degree, bleeding index, depth of probing, attachment loss, height of bone graft and thickness of bone formation were measured and recorded. Statistical analysis was performed using SPSS 25.0 software package. RESULTS: There was no significant difference in the success rate of implants between the two groups (95.24% vs 97.56%, P>0.05). The complication rate of the experimental group was significantly lower than that of the control group (2.38% vs 14.63%, P<0.05). The mucosal color and swelling degree scores of the experimental group were significantly lower than those of the control group [(0.65±0.03) points vs (2.01±0.15) points, (1.10±0.37) points vs (2.69±0.54) points, P<0.05], and the bleeding index, probing depth, and attachment loss were significantly lower than the control group [(0.35±0.05) vs (0.49±0.09), (3.39±0.62) mm vs (4.41±0.95) mm, (3.02±0.66) mm vs (5.31±0.91) mm, P<0.05], bone graft height and osteogenesis height were significantly higher than the control group [(2.61±0.50) mm vs (2.20±0.31) mm, (2.53±0.34) mm vs (2.02±0.27) mm, P<0.05]. The degree of postoperative pain in the experimental group was significantly lower than that in the control group(P<0.05). CONCLUSIONS: Rich self-concentrating growth factor fibrin solution combined with Bio-Oss bone powder can effectively promote mucosal healing and bone regeneration after oral implant-guided bone regeneration, and reduce postoperative pain and complications.


Assuntos
Substitutos Ósseos , Implantes Dentários , Regeneração Óssea , Fibrina , Humanos , Minerais
2.
Int J Oral Maxillofac Implants ; 35(5): e77-e85, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32991654

RESUMO

Resorbable membranes are well described and employed for horizontal guided bone regeneration (GBR). However, the currently available literature does not provide information on the bone volumetric changes during the healing that follows GBR procedures and dental implant placement. Therefore, the aim of this pilot study was to initially analyze the volumetric bone changes after treating pristine edentulous mandibular defects with lateral GBR using freeze-dried bone allograft (FDBA) and collagen resorbable membrane. Six patients were selected for the analysis. Clinical changes in bone volume before and after GBR were measured. In addition, digital volumetric analysis of the augmented ridges was performed preoperatively, as well as 4 and 6 months after the GBR procedure. At the time of dental implant placement, bone cores were collected during the osteotomy for histologic analysis. Data on volume changes showed a mean of 297.5 ± 134 mm3 augmented bone volume at 4 months with 5% ± 3.78% resorption from 4 to ≥ 6 months. Histologic bone core analysis showed 44.9% plusmn; 5.1% mineralization in the area of augmentation. Within the limitations of this pilot study, resorbable membranes exhibited reliability for GBR in intercalated mandibular defects, providing sufficient bone volume gain at ≥ 6 months for implant stabilization and limited resorption during graft healing.


Assuntos
Aumento do Rebordo Alveolar , Regeneração Óssea , Transplante Ósseo , Humanos , Projetos Piloto , Reprodutibilidade dos Testes
3.
Nat Commun ; 11(1): 4465, 2020 09 08.
Artigo em Inglês | MEDLINE | ID: mdl-32901012

RESUMO

Titanium implants have been widely used in bone tissue engineering for decades. However, orthopedic implant-associated infections increase the risk of implant failure and even lead to amputation in severe cases. Although TiO2 has photocatalytic activity to produce reactive oxygen species (ROS), the recombination of generated electrons and holes limits its antibacterial ability. Here, we describe a graphdiyne (GDY) composite TiO2 nanofiber that combats implant infections through enhanced photocatalysis and prolonged antibacterial ability. In addition, GDY-modified TiO2 nanofibers exert superior biocompatibility and osteoinductive abilities for cell adhesion and differentiation, thus contributing to the bone tissue regeneration process in drug-resistant bacteria-induced implant infection.


Assuntos
Antibacterianos/química , Grafite , Nanofibras/química , Próteses e Implantes , Infecções Relacionadas à Prótese/prevenção & controle , Titânio , Células 3T3 , Animais , Materiais Biocompatíveis/química , Regeneração Óssea , Sobrevivência Celular , Modelos Animais de Doenças , Feminino , Teste de Materiais , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Camundongos , Nanocompostos/química , Osteogênese , Processos Fotoquímicos , Infecções Estafilocócicas/prevenção & controle
4.
Int J Oral Maxillofac Implants ; 35(5): 917-923, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32991641

RESUMO

PURPOSE: Compaction of particulated grafts is done manually; thus, the effect of compression force on bone regeneration remains unclear. The aim of this study was to evaluate the impact of two different compression forces on the consolidation of particulated bovine hydroxyapatite. MATERIALS AND METHODS: Two titanium cylinders were fixed on the calvarium of eight New Zealand rabbits. Both defects were filled with particulated bovine hydroxyapatite subjected to a compression force of 0.7 kg/cm2 or 1.6 kg/cm2 before being covered with a resorbable collagen membrane. A handheld device that uses a spring to control the compression force applied by the plugger was used. At 6 weeks, histomorphometry of the area immediately adjacent to the calvaria bone and to the collagen membrane was performed. RESULTS: It was shown that next to the calvaria, the bone volume per tissue volume (BV/TV) was 29.0% ± 8.8% and 27.6% ± 8.2% at low and high compression force, respectively; the bone-to-biomaterial contact (BBC) was 58.2% ± 25.0% and 69.3% ± 22.9%, respectively (P > .05). In the corresponding area next to the collagen membrane, BV/TV was 4.9% ± 5.1% and 5.7% ± 4.7%, and the BBC was 18.3% ± 20.8% and 20.1% ± 15.9%, respectively (P > .05). In addition, the number and area of blood vessels were not significantly affected by compression force. CONCLUSION: Both compression forces applied resulted in similar consolidation of bovine hydroxyapatite expressed by new bone formation and vascularization based on a rabbit calvaria augmentation model.


Assuntos
Regeneração Óssea , Durapatita , Animais , Materiais Biocompatíveis , Bovinos , Colágeno , Coelhos , Crânio/cirurgia
5.
Artigo em Inglês | MEDLINE | ID: mdl-32925998

RESUMO

The aim of this retrospective study was to evaluate clinical and radiographic outcomes of guided bone regeneration (GBR) procedures in the rehabilitation of partially edentulous atrophic arches. A total of 58 patients were included with a follow-up of 3 to 7 years after loading. Data seem to indicate that GBR with nonresorbable membranes can be a good clinical choice and suggest that it could be used to vertically reconstruct no more than 6 mm of bone in the posterior mandible. However, this technique remains difficult and requires expert surgeons.


Assuntos
Perda do Osso Alveolar , Implantes Dentários , Regeneração Óssea , Implantação Dentária Endo-Óssea , Prótese Dentária Fixada por Implante , Falha de Restauração Dentária , Seguimentos , Humanos , Membranas Artificiais , Estudos Retrospectivos
6.
Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi ; 34(9): 1190-1194, 2020 Sep 15.
Artigo em Chinês | MEDLINE | ID: mdl-32929915

RESUMO

Objective: To summarize the application status of hypoxia mimetic agents in bone tissue engineering. Methods: The related literature about the hypoxia mimetic agents in bone tissue engineering was reviewed and analyzed. And the application status and progress of hypoxia mimetic agents in bone tissue engineering were retrospectively analyzed. Results: Hypoxia mimetic agents have the same effect as hypoxia in up-regulating the level of hypoxia inducible factor 1α (HIF-1α). The combination of hypoxia mimetic agents and scaffolds can up-regulate the level of HIF-1α in bone tissue engineering, thus promoting early vascularization and bone regeneration of the bone defect area, which provides a new idea for using bone tissue engineering to repair bone defect. At present, the commonly used hypoxia mimetic agents include iron chelating agents, oxoglutarate competitive analogues, proline hydroxylase inhibitors, etc. Conclusion: Hypoxia mimetic agents have a wide application prospect in bone tissue engineering, but they have been used in bone tissue engineering for a short time, more attention should be paid to their possible side effects. In the future research, the hypoxia mimetic agents should be developed in the direction of higher targeting specificity and safety, and the exact mechanism of hypoxia mimetic agents in promoting bone regeneration should be further explored.


Assuntos
Osso e Ossos , Engenharia Tecidual , Regeneração Óssea , Humanos , Hipóxia , Subunidade alfa do Fator 1 Induzível por Hipóxia , Estudos Retrospectivos
7.
Medicine (Baltimore) ; 99(33): e21756, 2020 Aug 14.
Artigo em Inglês | MEDLINE | ID: mdl-32872069

RESUMO

RATIONALE: Medication-related osteonecrosis of the jaw decreases quality of life of patients with cancer. The debate about it continues regarding the risk factors, etiology, and treatment methods, and so on. Also, spontaneous regeneration of the mandible is clinically rare. PATIENT CONCERNS: A 67-year-old woman presented to the authors' department complaining of pain, swelling, and pus discharge from a fistula. She previously had breast cancer bone metastases and had received antiresorptive intravenous bisphosphonate. DIAGNOSIS: The patient was diagnosed with medication-related osteonecrosis of the jaw. INTERVENTIONS: She received conservative therapy with antibiotics and surgical therapy as sequestrectomy under general anesthesia; however, the lesion did not heal. Thirty months after the MRONJ diagnosis, when she was 70 years' old, she underwent a left hemimandibulectomy without reconstruction under general anesthesia. OUTCOMES: Spontaneous regeneration of the mandible was observed by follow-up imaging examinations. The patient has no current subjective or objective symptoms. LESSONS: This is the first case report of the spontaneous mandibular regeneration after surgery for medication-related osteonecrosis of the jaw. Additionally, this case was the oldest patient among the published mandibular regeneration cases.


Assuntos
Osteonecrose da Arcada Osseodentária Associada a Difosfonatos/cirurgia , Regeneração Óssea , Mandíbula , Osteotomia Mandibular , Idoso , Feminino , Humanos , Radiografia Panorâmica
8.
Indian J Dent Res ; 31(3): 481-485, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32769287

RESUMO

Introduction: Hydroxyapatite based drug carriers offer a customized alternative to the delivery of pharmacologic agents in the osseous skeleton. They have an added advantage of being biocompatible and osteoconductive. This in vitro study aims to quantify the drug eluting properties of HA granules by spectrophotometry. Materials and Methods: HA and HASi beads were loaded with gentamicin/ amoxycillin- clavulanate/ vancomycin and grouped into 5. Drug elution was evaluated by means of UV spectrophotometry. Results: Drug eluent levels were well above bactericidal levels in all 5 groups. Conclusion: HA and HASi are viable options for clinicians for targeted drug delivery.


Assuntos
Durapatita , Vancomicina , Antibacterianos , Materiais Biocompatíveis , Regeneração Óssea , Portadores de Fármacos , Gentamicinas
9.
Int J Nanomedicine ; 15: 5825-5838, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32821104

RESUMO

Background and Purpose: The extracellular matrix (ECM) derived from bone marrow mesenchymal stem cells (BMSCs) has been used in regenerative medicine because of its good biological activity; however, its poor mechanical properties limit its application in bone regeneration. The purpose of this study is to construct a three dimensional-printed hydroxyapatite (3D-HA)/BMSC-ECM composite scaffold that not only has biological activity but also sufficient mechanical strength and reasonably distributed spatial structure. Methods: A BMSC-ECM was first extracted and formed into micron-sized particles, and then the ECM particles were modified onto the surface of 3D-HA scaffolds using an innovative linking method to generate composite 3D-HA/BMSC-ECM scaffolds. The 3D-HA scaffolds were used as the control group. The basic properties, biocompatibility and osteogenesis ability of both scaffolds were tested in vitro. Finally, a critical skull defect rat model was created and the osteogenesis effect of the scaffolds was evaluated in vivo. Results: The compressive modulus of the composite scaffolds reached 9.45±0.32 MPa, which was similar to that of the 3D-HA scaffolds (p>0.05). The pore size of the two scaffolds was 305±47 um and 315±34 um (p>0.05), respectively. A CCK-8 assay indicated that the scaffolds did not have cytotoxicity. The composite scaffolds had good cell adhesion ability, with a cell adhesion rate of up to 76.00±6.17% after culturing for 7 hours, while that of the 3D-HA scaffolds was 51.85±4.77% (p<0.01). In addition, the composite scaffold displayed higher alkaline phosphatase (ALP) activity, osteogenesis-related mRNA expression, and calcium nodule formation, thus confirming that the composite scaffolds had good osteogenic activity. The composite scaffolds exhibited good bone repair in vivo and were superior to the 3D-HA scaffolds. Conclusion: We conclude that BMSC-ECM is a good osteogenic material and that the composite scaffolds have good osteogenic ability, which provides a new method and concept for the repair of bone defects.


Assuntos
Durapatita/farmacologia , Matriz Extracelular/metabolismo , Células-Tronco Mesenquimais/citologia , Tecidos Suporte/química , Animais , Regeneração Óssea/efeitos dos fármacos , Osso e Ossos/diagnóstico por imagem , Osso e Ossos/efeitos dos fármacos , Osso e Ossos/patologia , Adesão Celular/efeitos dos fármacos , Morte Celular/efeitos dos fármacos , Diferenciação Celular/efeitos dos fármacos , Matriz Extracelular/efeitos dos fármacos , Hidrodinâmica , Masculino , Células-Tronco Mesenquimais/efeitos dos fármacos , Células-Tronco Mesenquimais/ultraestrutura , Osteogênese/efeitos dos fármacos , Osteogênese/genética , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Ratos Sprague-Dawley , Cicatrização/efeitos dos fármacos
10.
Int J Nanomedicine ; 15: 5027-5042, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32764934

RESUMO

Background: Bactericidal capacity, durable inhibition of biofilm formation, and a three-dimensional (3D) porous structure are the emphases of infected bone defect (IBD) treatment via local scaffold implantation strategy. Purpose: In this study, silver nanoparticle (AgNP)-loaded nano-hydroxyapatite (nHA)@ reduced graphene oxide (RGO) 3D scaffolds (AHRG scaffolds) were designed to alleviate bone infection, inhibit biofilm formation, and promote bone repair through the synergistic effects of AgNPs, RGO, and nHA. Materials and Methods: AHRGs were prepared using a one-step preparation method, to create a 3D porous scaffold to facilitate a uniform distribution of AgNPs and nHA. Methicillin-resistant Staphylococcus aureus (MRSA) was used as a model-resistant bacterium, and the effects of different silver loadings on the antimicrobial activity and cytocompatibility of materials were evaluated. Finally, a rabbit IBD model was used to evaluate the therapeutic effect of the AHRG scaffold in vivo. Results: The results showed successful synthesis of the AHRG scaffold. The ideal 3D porous structure was verified using scanning electron microscopy and transmission electron microscopy, and X-ray photoelectron spectroscopy and selected area electron diffraction measurements revealed uniform distributions of AgNP and nHA. In vitro antibacterial and cytocompatibility indicated that the 4% AHRG scaffolds possessed the most favorable balance of bactericidal properties and cytocompatibility. In vivo evaluation of the IBD model showed promising treatment efficacy of AHRG scaffolds. Conclusion: The as-fabricated AHRG scaffolds effectively eliminated infection and inhibited biofilm formation. IBD repair was facilitated by the bactericidal properties and 3D porous structure of the AHRG scaffold, suggesting its potential in the treatment of IBDs.


Assuntos
Antibacterianos/farmacologia , Doenças Ósseas Infecciosas/terapia , Grafite/química , Nanopartículas Metálicas/química , Engenharia Tecidual/métodos , Tecidos Suporte/química , Animais , Antibacterianos/química , Biofilmes/efeitos dos fármacos , Regeneração Óssea/efeitos dos fármacos , Substitutos Ósseos , Osso e Ossos/efeitos dos fármacos , Modelos Animais de Doenças , Durapatita/química , Feminino , Masculino , Teste de Materiais , Staphylococcus aureus Resistente à Meticilina/efeitos dos fármacos , Porosidade , Coelhos , Ratos , Prata/química , Prata/farmacologia , Infecções Estafilocócicas/terapia
11.
PLoS One ; 15(8): e0237660, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32841254

RESUMO

This study evaluated the influence of type 2 diabetes mellitus on bone loss, bone repair and cytokine production in hyperglycemic rats, treated or not with metformin. The animals were distributed as follow: Non-Hyperglycemic (NH), Non Hyperglycemic with Ligature (NH-L), Treated Non Hyperglycemic (TNH), Treated Non Hyperglycemic with Ligature Treated (TNH-L), Hyperglycemic (H), Treated Hyperglycemic (TH), Hyperglycemic with Ligature (H-L), Treated Hyperglycemic with Ligature (TH-L). At 40th day after induction of hyperglycemia, the groups NH-L, TNH-L, H-L, TH-L received a ligature to induce periodontitis. On the 69th, the TNH, TNH-L, TH, TH-L groups received metformin until the end of the study. Bone repair was evaluated at histometric and the expression levels of Sox9, RunX2 and Osterix. Analysis of the ex-vivo expression of TNF-α, IFN-γ, IL-12, IL-4, TGF-ß, IL-10, IL-6 and IL-17 were also evaluated. Metformin partially reverse induced bone loss in NH and H animals. Lower OPG/RANKL, increased OCN and TRAP expression were observed in hyperglycemic animals, and treatment with metformin partially reversed hyperglycemia on the OPG/RANKL, OPN and TRAP expression in the periodontitis. The expression of SOX9 and RunX2 were also decreased by hyperglycemia and metformin treatment. Increased ex vivo levels of TNF-α, IL-6, IL-4, IL-10 and IL-17 was observed. Hyperglycemia promoted increased IL-10 levels compared to non-hyperglycemic ones. Treatment of NH with metformin was able to mediate increased levels of TNF-α, IL-10 and IL-17, whereas for H an increase of TNF-α and IL-17 was detected in the 24- or 48-hour after stimulation with LPS. Ligature was able to induce increased levels of TNF-α and IL-17 in both NH and H. This study revealed the negative impact of hyperglycemia and/or treatment with metformin in the bone repair via inhibition of transcription factors associated with osteoblastic differentiation.


Assuntos
Perda do Osso Alveolar/prevenção & controle , Diabetes Mellitus Experimental/complicações , Diabetes Mellitus Tipo 2/complicações , Hiperglicemia/complicações , Metformina/administração & dosagem , Periodontite/prevenção & controle , Perda do Osso Alveolar/etiologia , Perda do Osso Alveolar/metabolismo , Processo Alveolar/citologia , Processo Alveolar/efeitos dos fármacos , Processo Alveolar/metabolismo , Processo Alveolar/patologia , Animais , Regeneração Óssea/efeitos dos fármacos , Regeneração Óssea/genética , Diferenciação Celular/efeitos dos fármacos , Citocinas/metabolismo , Diabetes Mellitus Experimental/induzido quimicamente , Diabetes Mellitus Experimental/tratamento farmacológico , Diabetes Mellitus Experimental/metabolismo , Diabetes Mellitus Tipo 2/induzido quimicamente , Diabetes Mellitus Tipo 2/tratamento farmacológico , Diabetes Mellitus Tipo 2/metabolismo , Humanos , Hiperglicemia/induzido quimicamente , Hiperglicemia/tratamento farmacológico , Hiperglicemia/metabolismo , Osteoblastos/fisiologia , Periodontite/etiologia , Periodontite/metabolismo , Ratos , Estreptozocina/toxicidade , Fatores de Transcrição/metabolismo
12.
Life Sci ; 258: 118195, 2020 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-32781073

RESUMO

AIMS: The estrogen-ERα axis participates in osteoblast maturation. This study was designed to further evaluated the roles of the estrogen-ERα axis in bone healing and the possible mechanisms. MAIN METHODS: Female ICR mice were created a metaphyseal bone defect in the left femurs and administered with methylpiperidinopyrazole (MPP), an inhibitor of ERα. Bone healing was evaluated using micro-computed tomography. Colocalization of ERα with alkaline phosphatase (ALP) and ERα translocation to mitochondria were determined. Levels of ERα, ERß, PECAM-1, VEGF, and ß-actin were immunodetected. Expression of chromosomal Runx2, ALP, and osteocalcin mRNAs and mitochondrial cytochrome c oxidase (COX) I and COXII mRNAs were quantified. Angiogenesis was measured with immunohistochemistry. KEY FINDINGS: Following surgery, the bone mass was time-dependently augmented in the bone-defect area. Simultaneously, levels of ERα were specifically upregulated and positively correlated with bone healing. Administration of MPP to mice consistently decreased levels of ERα and bone healing. As to the mechanisms, osteogenesis was enhanced in bone healing, but MPP attenuated osteoblast maturation. In parallel, expressions of osteogenesis-related ALP, Runx2, and osteocalcin mRNAs were induced in the injured zone. Treatment with MPP led to significant inhibition of the alp, runx2, and osteocalcin gene expressions. Remarkably, administration of MPP lessened translocation of ERα to mitochondria and expressions of mitochondrial energy production-related coxI and coxII genes. Furthermore, exposure to MPP decreased levels of PECAM-1 and VEGF in the bone-defect area. SIGNIFICANCE: The present study showed the contributions of the estrogen-ERα axis to bone healing through stimulation of energy production, osteoblast maturation, and angiogenesis.


Assuntos
Regeneração Óssea , Diferenciação Celular , Metabolismo Energético , Receptor alfa de Estrogênio/metabolismo , Neovascularização Fisiológica , Osteoblastos/citologia , Transdução de Sinais , Fosfatase Alcalina/metabolismo , Animais , Peso Corporal/efeitos dos fármacos , Regeneração Óssea/efeitos dos fármacos , Calo Ósseo/efeitos dos fármacos , Calo Ósseo/patologia , Diferenciação Celular/efeitos dos fármacos , Cromossomos de Mamíferos/metabolismo , Subunidade alfa 1 de Fator de Ligação ao Core/metabolismo , Complexo IV da Cadeia de Transporte de Elétrons/genética , Complexo IV da Cadeia de Transporte de Elétrons/metabolismo , Metabolismo Energético/efeitos dos fármacos , Feminino , Regulação da Expressão Gênica/efeitos dos fármacos , Técnicas de Silenciamento de Genes , Camundongos Endogâmicos ICR , Mitocôndrias/efeitos dos fármacos , Mitocôndrias/metabolismo , Neovascularização Fisiológica/efeitos dos fármacos , Tamanho do Órgão/efeitos dos fármacos , Osteoblastos/efeitos dos fármacos , Osteoblastos/metabolismo , Osteocalcina/metabolismo , Osteogênese/efeitos dos fármacos , Transporte Proteico/efeitos dos fármacos , Pirazóis/administração & dosagem , Pirazóis/farmacologia , Regulação para Cima/efeitos dos fármacos , Cicatrização/efeitos dos fármacos
13.
Clin Oral Implants Res ; 31(10): 1025-1036, 2020 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-32790921

RESUMO

OBJECTIVE: To test the hypotheses of no differences in (I) percentage of bone (POB), non-mineralized tissue (NMT), and deproteinized bovine bone mineral (DBBM), and (II) ingrowth of mineralized bone after lateral guided bone regeneration (GBR) augmentation of the mandible with different ratios of DBBM and particulate autogenous bone (PAB) at different time points. MATERIAL AND METHODS: Twenty-four minipigs were randomly allocated into three groups. Lateral augmentation in 96 sites (4 in each animal) was performed unilaterally with a standardized quantity of grafting material in each animal with different ratios of DBBM and PAB (50:50, 75:25, 100:0) and autogenous bone block in combination with DBBM and covered with a collagen membrane. The percentage of different tissues in the graft and ingrowth of mineralized bone was assessed by histomorphometrical and histological analyses after 10, 20, and 30 weeks, respectively. RESULTS: The POB was 54% (50:50), 50% (75:25), and 48% (100:0) after 10 weeks, 60% (50:50), 61% (75:25), and 60% (100:0) after 20 weeks, and 63% (50:50), 62% (75:25), and 62% (100:0) after 30 weeks. There was no significant difference between the groups at any time points. There was a significant increase in POB and a significant decrease in NMT for 75:25 and 100:0 from 10 to 30 weeks. All ratios demonstrated a non-complete ingrowth of mineralized bone into the graft after 10 weeks and complete mineralization after 30 weeks. CONCLUSION: Within the limitations of the present study, it seems like addition of autogenous bone to DBBM for LRA did not affect the bone formation nor graft incorporation after 10-30 weeks of healing. However, a prolonged healing time seems to result in an increased POB for all ratios.


Assuntos
Aumento do Rebordo Alveolar , Substitutos Ósseos/farmacologia , Animais , Regeneração Óssea , Transplante Ósseo , Bovinos , Mandíbula/cirurgia , Minerais , Suínos , Porco Miniatura
14.
Adv Exp Med Biol ; 1250: 3-13, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32601934

RESUMO

Collagen is an important component that makes 25-35% of our body proteins. Over the past decades, tissue engineers have been designing collagen-based biocompatible materials and studying their applications in different fields. Collagen obtained from cattle and pigs has been mainly used until now, but collagen derived from fish and other livestock has attracted more attention since the outbreak of mad cow disease, and they are also used as a raw material for cosmetics and foods. Due to the zoonotic infection using collagen derived from pigs and cattle, their application in developing biomaterials is limited; hence, the development of new animal-derived collagen is required. In addition, there is a religion (Islam, Hinduism, and Judaism) limited to export raw materials and products derived from cattle and pig. Hence, high-value collagen that is universally accessible in the world market is required. Therefore, in this review, we have dealt with the use of duck's feet-derived collagen (DC) as an emerging alternative to solve this problem and also presenting few original investigated bone regeneration results performed using DC.


Assuntos
Regeneração Óssea , Colágeno , Patos , Engenharia Tecidual , Animais , Materiais Biocompatíveis , Regeneração Óssea/fisiologia , Colágeno/química , Colágeno/metabolismo , Engenharia Tecidual/métodos , Tecidos Suporte
15.
Adv Exp Med Biol ; 1250: 79-93, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32601939

RESUMO

Treatment for the osteochondral defects (ODs) is more challenging nowadays that needs to be addressed by developing alternative bone tissue engineering materials. Gellan gum (GG) is a widely used natural polysaccharide in the field of tissue engineering (TE) and regenerative medicine due to its versatile properties. There are many reports about the successful application of GG in cartilage tissue engineering and guiding bone formation. Functional coatings and porous composite materials have been introduced in next-generation materials for treating OD, whereas osteoconductive materials, such as demineralized bone particle (DBP) or bone derivatives, are used. However, modification of porosity, biocompatibility, cell proliferation, and mechanical properties is needed. DBP can activate human mesenchymal stem cells to differentiate into osteoblast cells. In this chapter, the potential application of GG with DBP in different combinations was reviewed, and the best suitable combinations were selected and further studied in small animal models for the soft and hard tissue engineering applications; also its application in the osteochondral integration fields were briefly discussed.


Assuntos
Regeneração Óssea , Polissacarídeos Bacterianos , Engenharia Tecidual , Animais , Galinhas , Humanos , Hidrogéis , Polissacarídeos Bacterianos/química , Engenharia Tecidual/métodos
16.
Adv Exp Med Biol ; 1250: 97-108, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32601940

RESUMO

The clinical need for effective bone regeneration remains in huge demands. Although autologous and allogeneic bone grafts are generally considered "gold standard" treatments for bone defects, these approaches may result in various complications. Furthermore, safety considerations of gene- and cell-based therapies require further clarification and approval from regulatory authorities. Therefore, developing new therapeutic biomaterials that can empower endogenous regenerative properties to accelerate bone repair and regeneration is of great significance. Extracellular vesicles (EVs) comprise a heterogeneous population of naturally derived nanoparticles that play a critical role in mediating cell-cell communication. The vast amount of biological processes that EVs are involved in, such as immune modulation, senescence, and angiogenesis, and the versatility of manner in which they can influence the behavior of recipient cells make EVs an interesting source for both diagnostic and therapeutic applications. Advancement of knowledge in the fields of immunology and cell biology has sparked the exploration of the potential of EVs in the field of regenerative medicine. EVs travel between cells and deliver functional cargoes, such as proteins and RNAs, thereby regulating the recruitment, proliferation, and differentiation of recipient cells. Numerous studies have demonstrated the pivotal role of EVs in tissue regeneration both in vitro and in vivo. In this chapter, we will outline current knowledge surrounding EVs, summarize their functional roles in bone regenerative medicine, and elaborate on potential application and challenges of EV-integrated biomaterials in bone tissue engineering.


Assuntos
Materiais Biocompatíveis , Regeneração Óssea , Vesículas Extracelulares , Medicina Regenerativa , Engenharia Tecidual , Materiais Biocompatíveis/química , Materiais Biocompatíveis/normas , Humanos , Medicina Regenerativa/métodos , Engenharia Tecidual/métodos
17.
Adv Exp Med Biol ; 1250: 177-188, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32601945

RESUMO

Biphasic calcium phosphate bioceramics consist of an intimate mixture of hydroxyapatite (HA) and beta-tricalcium phosphate (ß-TCP) in varying ratios. Due to their biocompatibility, osteoconductivity, and safety in in vitro, in vivo, and clinical models, they have become promising bone substitute biomaterials and are recommended for use as alternatives for or as additives in bone tissue regeneration in various orthopedic and dental applications. Many studies have demonstrated the potential uses of BCP bioceramics as scaffolds for tissue engineering. Here, we highlight the recent advances in the uses of BCP bioceramics and functionalized BCPs for bone tissue regeneration.


Assuntos
Regeneração Óssea , Substitutos Ósseos , Hidroxiapatitas , Substitutos Ósseos/química , Substitutos Ósseos/normas , Humanos
18.
Int J Oral Maxillofac Implants ; 35(4): 824-832, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32724937

RESUMO

PURPOSE: A barrier membrane consisting of an equine-derived, demineralized cortical bone sheet has been made available, yet evidence of its effectiveness is currently only anecdotal. This study aimed to obtain preliminary evidence concerning the medium-term prosthetic and implant success rates that may be achieved when such a membrane is used in combination with an equine, enzyme-treated bone graft, concomitantly to implant placement in the esthetic zone. MATERIALS AND METHODS: Records of patients who had one or two implants placed in the anterior sectors of the two arches and had peri-implant bone regeneration carried out using the equine-derived membrane and equine-derived collagen-preserving bone granules were retrospectively collected. Peri-implant marginal bone loss (MBL) was used to assess implant survival. When available, histologic data concerning the equine membrane and cone beam computed tomography (CBCT) scans were analyzed as well. RESULTS: Records of 32 patients (ages 36 to 73 years), corresponding to 44 implants placed, were retrieved and analyzed. The mean follow-up was 113.9 ± 10.2 months. Two implants failed. The implant success rate was 90.9%. Twelve membrane samples could be retrieved and analyzed, showing the membrane was still occlusive at 4.2 ± 1.1 months and only beginning to undergo remodeling. Twelve CBCT scans showed that 65.1 ± 9.8 months after surgery, a newly formed cortical layer could be observed in the zone that had undergone grafting. CONCLUSION: The equine cortical bone membrane and the enzyme-treated bone graft used in this case series achieved a medium-term implant and prosthetic success rate that was not dissimilar to that of other resorbable membranes and grafts for peri-implant guided bone regeneration augmentation. Preliminary medium-term histologic and CBCT data suggest that the membrane may be occlusive for a period of at least 4 months and may contribute to preserve the ridge thickness over time.


Assuntos
Aumento do Rebordo Alveolar , Implantes Dentários , Adulto , Idoso , Animais , Regeneração Óssea , Transplante Ósseo , Osso Cortical , Implantação Dentária Endo-Óssea , Estética Dentária , Seguimentos , Humanos , Pessoa de Meia-Idade , Estudos Retrospectivos , Resultado do Tratamento
19.
Bratisl Lek Listy ; 121(8): 571-579, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32726120

RESUMO

OBJECTIVE: The main objective of the present study was to investigate the possible osteostimulatory action of recombinant human matrix metalloproteinase-2 (rhMMP-2) implanted in a bone defect made in calvaria of rats, bounded to the monoolein as carrier. METHODS: Forty-four adult male Wistar rats (about 600 g body weight) underwent surgery in order to create a spherical defect in parietal bone on the right side of the median sagittal suture by using 4 mm diameter of a trephine drill. Animals were divided into three groups: no treatment (control, C), treatment with rhMMP-2 diluted in monoolein liquid crystal (rhMMP-2) and negative control with monoolein (M). The groups were divided into two experimental times, 2- and 4-weeks of experimental time. RESULTS: The rate of new-formed bone, estimated by the number of points on new-formed cancellous bone, was in enhanced rhMMP-2 group in both periods in comparison to C or M groups. CONCLUSION: There was no difference in bone neoformation between second to fourth week within groups. In the present study, monoolein alone had a negative role in the post-operative surgery, but monoolein associated with +rhMMP-2 had a positive role on releasing rhMMP-2 and enhance the rate of new-formed bone (Tab. 1, Fig. 5, Ref. 71).


Assuntos
Regeneração Óssea , Glicerídeos , Metaloproteinase 2 da Matriz , Proteínas Recombinantes , Adulto , Animais , Glicerídeos/farmacologia , Glicerídeos/uso terapêutico , Humanos , Masculino , Metaloproteinase 2 da Matriz/farmacologia , Ratos , Ratos Wistar , Proteínas Recombinantes/farmacologia , Proteínas Recombinantes/uso terapêutico
20.
Life Sci ; 257: 118038, 2020 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-32622947

RESUMO

PURPOSE: The importance of regeneration in large bone defects forces the orthopedic surgeons to search for a proper methodology. The present experiment evaluated the capability of polylactic acid/polycaprolactone/hydroxyapatite (PLA/PCL/HA) scaffold loaded with and without mesenchymal stem cells (MSCs) on bone regeneration. METHODS: Fourier transform infrared spectrometry, X-ray diffraction, scanning electron microscopy, and rheology methodologies were used to characterize the scaffold. Forty Wistar rats were randomly divided into the four groups including the untreated defects as the control group and three other groups in which the bone defects were treated with autologous bones (autograft group), the PLA/PCL/HA scaffolds (PLA/PCL/HA group), and the MSCs-seeded scaffolds (MSCs-seeded PLA/PCL/HA group). RESULTS: Based on the qRT-PCR results, significantly higher expression levels of osteocalcin, osteopontin, and CD31 were seen in the cell-seeded scaffold group compared to the control group (P < 0.05). The CT scanning and radiographic images depicted significantly more newly formed bonny tissue in the MSCs-loaded scaffold and autograft groups than the untreated group (P < 0.001). The immunohistochemistry, biomechanical, histopathologic, and histomorphometric evaluations demonstrated significantly improved regeneration in the autograft and MSCs-loaded scaffold groups compared to the non-treated group (P < 0.05). There were significant differences between the scaffold and untreated groups in all in vivo evaluations (P < 0.05). CONCLUSION: The MSCs enhanced bone healing potential of the PLA/PCL/HA scaffold and the MSCs-seeded scaffold was comparable to the autograft as the golden treatment regimen (P > 0.05).


Assuntos
Regeneração Óssea/fisiologia , Transplante de Células-Tronco Mesenquimais/métodos , Engenharia Tecidual/métodos , Animais , Regeneração Óssea/efeitos dos fármacos , Osso e Ossos/metabolismo , Durapatita/química , Masculino , Células-Tronco Mesenquimais/fisiologia , Poliésteres/química , Rádio (Anatomia)/metabolismo , Ratos , Ratos Wistar , Tecidos Suporte/química
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