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https://www.readbyqxmd.com/read/28096214/cartilage-to-bone-transformation-during-fracture-healing-is-coordinated-by-the-invading-vasculature-and-induction-of-the-core-pluripotency-genes
#1
Diane P Hu, Federico Ferro, Frank Yang, Aaron J Taylor, Wenhan Chang, Theodore Miclau, Ralph S Marcucio, Chelsea S Bahney
Fractures heal predominantly through the process of endochondral ossification. The classic model of endochondral ossification holds that chondrocytes mature to hypertrophy, undergo apoptosis and new bone forms by invading osteoprogenitors. However, recent data demonstrate that chondrocytes transdifferentiate to osteoblasts in the growth plate and during regeneration, yet the mechanism(s) regulating this process remain unknown. Here, we show a spatially-dependent phenotypic overlap between hypertrophic chondrocytes and osteoblasts at the chondro-osseous border in the fracture callus, in a region we define as the transition zone (TZ)...
January 15, 2017: Development
https://www.readbyqxmd.com/read/28070691/biological-characteristic-effects-of-human-dental-pulp-stem-cells-on-poly-%C3%AE%C2%B5-caprolactone-biphasic-calcium-phosphate-fabricated-scaffolds-using-modified-melt-stretching-and-multilayer-deposition
#2
Natkrita Wongsupa, Thongchai Nuntanaranont, Suttatip Kamolmattayakul, Nuttawut Thuaksuban
Craniofacial bone defects such as alveolar cleft affect the esthetics and functions that need bone reconstruction. The advanced techniques of biomaterials combined with stem cells have been a challenging role for maxillofacial surgeons and scientists. PCL-coated biphasic calcium phosphate (PCL-BCP) scaffolds were created with the modified melt stretching and multilayer deposition (mMSMD) technique and merged with human dental pulp stem cells (hDPSCs) to fulfill the component of tissue engineering for bone substitution...
February 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28068758/strontium-doped-amorphous-calcium-phosphate-porous-microspheres-synthesized-through-a-microwave-hydrothermal-method-using-fructose-1-6-bisphosphate-as-an-organic-phosphorus-source-application-in-drug-delivery-and-enhanced-bone-regeneration
#3
Weilin Yu, Tuan-Wei Sun, Chao Qi, Zhen-Yu Ding, Hua-Kun Zhao, Feng Chen, Dao-Yun Chen, Ying-Jie Zhu, Zhongmin Shi, Yaohua He
Nanostructured calcium phosphate (CaP) porous microspheres are of great potential in drug delivery and bone regeneration due to their large specific surface area, biocompatibility and similarity to inorganic component of osseous tissue. In this work, strontium (Sr)-doped amorphous calcium phosphate porous microspheres (SrAPMs) were synthesized through a microwave-hydrothermal method using fructose 1,6-bisphosphate trisodium salt (FBP) as the source of phosphate ions. The SrAPMs showed a mesoporous structure and a relatively high specific area...
January 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28054585/osseous-differentiation-of-human-fat-tissue-grafts-from-tissue-engineering-to-tissue-differentiation
#4
Maryna Bondarava, Chiara Cattaneo, Bin Ren, Wolfgang E Thasler, Volkmar Jansson, Peter E Müller, Oliver B Betz
Conventional bone tissue engineering approaches require isolation and in vitro propagation of autologous cells, followed by seeding on a variety of scaffolds. Those protracted procedures impede the clinical applications. Here we report the transdifferentiation of human fat tissue fragments retrieved from subcutaneous fat into tissue with bone characteristics in vitro without prior cell isolation and propagation. 3D collagen-I cultures of human fat tissue were cultivated either in growth medium or in osteogenic medium (OM) with or without addition of Bone Morphogenetic Proteins (BMPs) BMP-2, BMP-7 or BMP-9...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28012106/osteogenic-potential-of-the-transcription-factor-c-myb
#5
V Oralova, E Matalova, M Killinger, L Knopfova, J Smarda, M Buchtova
The transcription factor c-MYB is a well-known marker of undifferentiated cells such as haematopoietic cell precursors, but recently it has also been observed in differentiated cells that produce hard tissues. Our previous findings showed the presence of c-MYB in intramembranous bones and its involvement in the chondrogenic steps of endochondral ossification, where the up-regulation of early chondrogenic markers after c-myb overexpression was observed. Since we previously detected c-MYB in osteoblasts, we aimed to analyse the localisation of c-MYB during later stages of endochondral bone formation and address its function during bone matrix production...
December 24, 2016: Calcified Tissue International
https://www.readbyqxmd.com/read/27966508/comparative-evaluation-of-platelet-rich-fibrin-and-autogenous-bone-graft-for-the-treatment-of-infrabony-defects-in-chronic-periodontitis-clinical-radiological-and-surgical-reentry
#6
Sneha Galav, Kabbur Thippanna Chandrashekar, Rohit Mishra, Vandana Tripathi, Richa Agarwal, Ankit Galav
CONTEXT: Both intraoral autogenous bone grafting (ABG) and platelet-rich fibrin (PRF) offer a useful treatment modality for periodontal regeneration of intrabony defects (IBDs). However, predictable regeneration in patients with severe attachment loss is a challenge to the practitioners. AIM: The aim of this study was to compare the clinical efficacy of PRF with ABG for the treatment of IBDs in chronic periodontitis. SETTINGS AND DESIGN: This is a randomized controlled trial...
September 2016: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/27933720/autogenous-bone-grafting-for-treatment-of-osseous-defect-after-impacted-mandibular-third-molar-extraction-a-randomized-controlled-trial
#7
Jing Ge, Chi Yang, Jiawei Zheng, Yingkai Hu
BACKGROUND: Extraction of impacted mandibular third molar (M3) has been cited as causing osseous defect at the distal aspect of the adjacent second molar (M2). PURPOSE: This randomized controlled trial was aimed to evaluate the effect of autogenous bone grafting in situ for regeneration of periodontal osseous defect distal to the M2 compared with non-grafting after impacted M3 removal. MATERIALS AND METHODS: A total of 60 sites in 51 adult patients were enrolled and randomly assigned to the control group or the test group...
December 8, 2016: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/27929692/osteoporotic-animal-models-of-bone-healing-advantages-and-pitfalls
#8
Elena Calciolari, Nikolaos Donos, Nikos Mardas
The aim of this review was to summarize the advantages and pitfalls of the available osteoporotic animal models of bone healing. A thorough literature search was performed in MEDLINE via OVID and EMBASE to identify animal studies investigating the effect of experimental osteoporosis on bone healing and bone regeneration. The osteotomy model in the proximal tibia is the most popular osseous defect model to study the bone healing process in osteoporotic-like conditions, although other well-characterized models, such as the post-extraction model, might be taken into consideration by future studies...
December 8, 2016: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/27900247/use-of-autologous-platelet-rich-fibrin-in-osseous-regeneration-after-cystic-enucleation-a-clinical-study
#9
Manzoor Dar, Tajamul Hakim, Ajaz Shah, Latief Najar, Gowhar Yaqoob, Faiqah Lanker
AIMS AND OBJECTIVES: The aim of this study was to evaluate the efficacy of PRF in osseous regeneration after enucleation of cystic lesions. The objectives of this study were as follows: (1) to evaluate osseous regeneration radiographically with the use of PRF in intrabony defects after cystic enucleation. (2) To evaluate the degree of bone density in intrabony defects with the use of PRF postoperatively after 1st, 3rd, and 6th months. SUBJECTS AND METHODS: 20 cases of cystic lesions were treated using PRF after cystic enucleation...
November 2016: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/27878265/synergistic-effects-of-overexpression-of-bmp%C3%A2-2-and-tgf%C3%A2-%C3%AE-3-on-osteogenic-differentiation-of-bone-marrow-mesenchymal-stem-cells
#10
Yilin Wang, Tian He, Jie Liu, Hongzhi Liu, Lugang Zhou, Wei Hao, Yujie Sun, Xin Wang
Bone morphogenetic protein 2 (BMP-2) and transforming growth factor β (TGF-β) isoforms are important in advancing bone regeneration. The aim of the present study was to investigate the positive and reciprocal effect of TGF‑β3, one of the three TGF‑β isoforms, on BMP‑2 in promoting osteogenic differentiation. Exogenous BMP‑2 and TGF‑β3 genes were separately, and in combination, overexpressed in rabbit bone marrow‑derived mesenchymal stem cells (rBMSCs). Expression levels of BMP‑2 and TGF‑β3 were evaluated using reverse‑transcription‑polymerase chain reaction (RT‑PCR) and Western blotting assays...
December 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27875512/single-tooth-osteotomy-combined-wide-linear-corticotomy-under-local-anesthesia-for-correcting-anterior-protrusion-with-ectopically-erupted-canine
#11
Nur Serife Iskenderoglu, Byung-Joon Choi, Kyung Won Seo, Yeon-Ji Lee, Baek-Soo Lee, Seong-Hun Kim
BACKGROUNDS: This article presents the alternative surgical treatments of both anterior protrusion by carrying out retraction on mandibular anterior fragment, meanwhile applying retraction force on maxilla anterior teeth and ectopically erupted canine with using platelet-rich fibrin (PRF). METHODS: Anterior segmental osteotomy was combined with linear corticotomy under local anesthesia. The correction of right ectopic canine was achieved through 2 stages. First, dento-osseous osteotomy on palatal side was performed...
November 21, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27865631/the-influence-of-cortical-bone-perforation-on-guided-bone-regeneration-in-humans
#12
S A Danesh-Sani, D Tarnow, J K Yip, R Mojaver
The purpose of this study was to evaluate the effect of cortical bone perforation on angiogenesis and osteogenesis of the augmented ridge in guided bone regeneration. Eighteen patients who had osseous defects in the mandible were selected. In the test group (n=9), alveolar cortical bone in the area of regeneration was perforated. No decortication was performed in the control group (n=9). Subsequently, defects were augmented by guided bone regeneration using resorbable membrane and bovine bone. After a healing period of 7 months, trephine cores were harvested for histological and histomorphometric analysis of the grafted areas...
February 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27859491/origination-of-antlerogenesis
#13
Nicola S Heckeberg
Antlers are unique appendages. They are shed and rebuilt at intervals, and are synapomorphic for all living Cervidae (except for the Chinese water deer, Hydropotes inermis, in which they have presumably been lost). The antlerogenic process is controlled by a complex interaction of fluctuating levels of several hormones, most importantly testosterone. The oldest antler remains are recorded from the early Miocene; these have been interpreted as non-deciduous appendages because of supposed permanent skin coverage and the lack of a burr (a well-developed osseous protuberance around the base of the antler, which is always present in extant cervids)...
November 17, 2016: Journal of Morphology
https://www.readbyqxmd.com/read/27845276/3d-scaffold-with-effective-multidrug-sequential-release-against-bacteria-biofilm
#14
Rafaela García-Alvarez, Isabel Izquierdo-Barba, María Vallet-Regí
: Bone infection is a feared complication following surgery or trauma that remains as an extremely difficult disease to deal with. So far, the outcome of therapy could be improved with the design of 3D implants, which combine the merits of osseous regeneration and local multidrug therapy so as to avoid bacterial growth, drug resistance and the feared side effects. Herein, hierarchical 3D multidrug scaffolds based on nanocomposite bioceramic and polyvinyl alcohol (PVA) prepared by rapid prototyping with an external coating of gelatin-glutaraldehyde (Gel-Glu) have been fabricated...
November 11, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27824330/effect-of-sustained-pdgf-nonviral-gene-delivery-on-repair-of-tooth-supporting-bone-defects
#15
A B Plonka, B Khorsand, N Yu, J V Sugai, A K Salem, W V Giannobile, S Elangovan
Recombinant human platelet-derived growth factor-BB (rhPDGF-BB) promotes soft tissue and bone healing, and is Food and Drug Administration-approved for treatment of diabetic ulcers and periodontal defects. The short half-life of topical rhPDGF-BB protein application necessitates bolus, high-dose delivery. Gene therapy enables sustained local growth factor production. A novel gene activated matrix delivering polyplexes of polyethylenimine (PEI)-plasmid DNA encoding PDGF was evaluated for promotion of periodontal wound repair in vivo...
December 8, 2016: Gene Therapy
https://www.readbyqxmd.com/read/27790579/pure-titanium-membrane-ultra-ti-%C3%A2-in-the-treatment-of-periodontal-osseous-defects-a-split-mouth-comparative-study
#16
Rashmi Khanna, Rajeev Khanna, Nilesh Dinesh Pardhe, Nancy Srivastava, Manas Bajpai, Shailendra Gupta
INTRODUCTION: Although many different types of Guided Tissue Regeneration (GTR) membranes (resorbable/non-resorbable, including titanium mesh) have been used in the field of Periodontics till now, but this is the first and only clinical study testing the effectiveness of an ultra thin pure Titanium Membrane (Ultra Ti) as a GTR membrane in infra-bony periodontal defects. AIM: To compare the efficacy of GTR in intra-bony defects with newly introduced non-resorbable barrier membrane, made of titanium called "Ultra-Ti (®) GTR Membrane" versus open flap debridement...
September 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27790578/clinical-evaluation-of-insulin-like-growth-factor-i-and-vascular-endothelial-growth-factor-with-alloplastic-bone-graft-material-in-the-management-of-human-two-wall-intra-osseous-defects
#17
Renu Devi, Jaya Dixit
INTRODUCTION: In recent years, emphasis on the use of growth factors for periodontal healing is gaining great momentum. Several growth factors showed promising results in periodontal regeneration. AIM: This study was designed to compare the clinical outcomes of 0.8μg recombinant human Vascular Endothelial Growth Factor (rh-VEGF) and 10μg recombinant human Insulin Like Growth Factor-I (rh-IGF-I) with β-Tricalcium Phosphate (β-TCP) and Polylactide-Polyglycolide Acid (PLGA) membrane in two wall intra-osseous defects...
September 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27727104/differential-modulation-of-zoledronate-and-etidronate-in-osseous-healing-of-an-extracted-socket-and-tibia-defect
#18
Shin Saeng Lim, Beomseok Lee, In Sook Kim, Soon Jung Hwang
OBJECTIVES: Osteonecrosis of the jaw has been increasing after dentoalveolar surgery in patients treated with an antiresorptive bisphosphonate (BP), especially strong zoledronate (ZA). The pathophysiology underlying why osteonecrosis occurs exclusively in the jaw bone remains unclear. This study investigated skeletal site-specific bone healing during the use of BPs to explore the preferential incidence of osteonecrosis of the jaw bone. STUDY DESIGN: Extraction of mandibular molar and creation of a tibia defect were performed in rats 2 weeks after weekly intravenous injections with the potent ZA and the weaker BP etidronate...
January 2017: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
https://www.readbyqxmd.com/read/27722231/strontium-folate-loaded-biohybrid-scaffolds-seeded-with-dental-pulp-stem-cells-induce-in-vivo-bone-regeneration-in-critical-sized-defects
#19
Marcela Martin-Del-Campo, Raul Rosales-Ibañez, Keila Alvarado, Jose G Sampedro, Christian A Garcia-Sepulveda, Sanjukta Deb, Julio San Román, Luis Rojo
Strontium folate (SrFO) is a recently developed bone promoting agent with interest in medical and pharmaceutical fields due to its improved features in comparison to current strontium based therapies for osteoporosis and other bone diseases. In this work SrFO derivative was synthesized and loaded into biohybrid scaffolds obtained through lyophilisation of semi-interpenetrating networks of chitosan polyethylene glycol dimethacrylate and beta tri-calcium phosphate (βTCP) fabricated using free radical polymerization...
October 18, 2016: Biomaterials Science
https://www.readbyqxmd.com/read/27712189/a-computational-model-of-osteochondral-defect-repair-following-implantation-of-stem-cell-laden-multiphase-scaffolds
#20
Adam O'Reilly, Daniel John Kelly
Developing successful tissue engineering strategies requires an understanding of how cells within an implanted scaffold interact with the host environment. The objective of this study was to use a computational mechanobiological model to explore how the design of a cell-laden scaffold influences the spatial formation of cartilage and bone within an osteochondral defect. Tissue differentiation was predicted using a previously developed model, in which cell fate depends on the local oxygen tension and the mechanical environment within a damaged joint...
January 2017: Tissue Engineering. Part A
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