The Experts below are selected from a list of 42954 Experts worldwide ranked by ideXlab platform
George Rebitski - One of the best experts on this subject based on the ideXlab platform.
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ridge preservation utilizing an acellular dermal allograft and demineralized freeze dried bone allograft part i a report of 2 cases
Journal of Periodontology, 2000Co-Authors: Edward B Fowler, Lawrence G Breault, George RebitskiAbstract:Alveolar ridge deformities are usually the result of trauma, periodontal disease, surgical insult, or developmental defects. Preventing ridge collapse with the extraction of maxillary anterior teeth is vital to an esthetic restorative result. Several techniques are available to prevent ridge collapse. In these case presentations, ridge preservation was achieved utilizing an acellular dermal matrix as a Barrier Membrane with a demineralized freeze-dried bone allograft. This report demonstrated an acceptable esthetic result with no loss of ridge height or width. Soft tissue dimensions were also preserved. The two graft materials were well accepted by the body and healing was rapid and without significant discomfort. The technique illustrated provides the surgeon with another option to prevent ridge collapse and ultimately improve esthetics. J Periodontol 2000;71:1353-1359.
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ridge preservation utilizing an acellular dermal allograft and demineralized freeze dried bone allograft part ii immediate endosseous implant placement
Journal of Periodontology, 2000Co-Authors: Edward B Fowler, Lawrence G Breault, George RebitskiAbstract:When maxillary anterior teeth are extracted, subsequent ridge collapse can significantly compromise esthetics. Preservation of an adequate volume of bone is vital to successful implant placement. Ridge preservation achieved utilizing an acellular dermal matrix as a Barrier Membrane with a demineralized freezedried bone allograft has been previously reported. In this case presentation, guided bone regeneration was achieved around an immediate endosseous implant when this same technique was used. As in the previous case reports, this technique demonstrated an acceptable esthetic result with virtually no loss of ridge height or width. Soft tissue dimensions were also preserved. Both the hard and soft tissue grafts were well accepted by the body and healing was rapid and without significant discomfort. This surgical technique provides the clinician with an option to provide immediate implant therapy when primary closure cannot be achieved. J Periodontol 2000;71:1360-1364.
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ridge preservation utilizing an acellular dermal allograft and demineralized freeze dried bone allograft part ii immediate endosseous implant placement
Journal of Periodontology, 2000Co-Authors: Edward B Fowler, Lawrence G Breault, George RebitskiAbstract:When maxillary anterior teeth are extracted, subsequent ridge collapse can significantly compromise esthetics. Preservation of an adequate volume of bone is vital to successful implant placement. Ridge preservation achieved utilizing an acellular dermal matrix as a Barrier Membrane with a demineralized freeze-dried bone allograft has been previously reported. In this case presentation, guided bone regeneration was achieved around an immediate endosseous implant when this same technique was used. As in the previous case reports, this technique demonstrated an acceptable esthetic result with virtually no loss of ridge height or width. Soft tissue dimensions were also preserved. Both the hard and soft tissue grafts were well accepted by the body and healing was rapid and without significant discomfort. This surgical technique provides the clinician with an option to provide immediate implant therapy when primary closure cannot be achieved.
Edward B Fowler - One of the best experts on this subject based on the ideXlab platform.
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ridge preservation utilizing an acellular dermal allograft and demineralized freeze dried bone allograft part i a report of 2 cases
Journal of Periodontology, 2000Co-Authors: Edward B Fowler, Lawrence G Breault, George RebitskiAbstract:Alveolar ridge deformities are usually the result of trauma, periodontal disease, surgical insult, or developmental defects. Preventing ridge collapse with the extraction of maxillary anterior teeth is vital to an esthetic restorative result. Several techniques are available to prevent ridge collapse. In these case presentations, ridge preservation was achieved utilizing an acellular dermal matrix as a Barrier Membrane with a demineralized freeze-dried bone allograft. This report demonstrated an acceptable esthetic result with no loss of ridge height or width. Soft tissue dimensions were also preserved. The two graft materials were well accepted by the body and healing was rapid and without significant discomfort. The technique illustrated provides the surgeon with another option to prevent ridge collapse and ultimately improve esthetics. J Periodontol 2000;71:1353-1359.
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ridge preservation utilizing an acellular dermal allograft and demineralized freeze dried bone allograft part ii immediate endosseous implant placement
Journal of Periodontology, 2000Co-Authors: Edward B Fowler, Lawrence G Breault, George RebitskiAbstract:When maxillary anterior teeth are extracted, subsequent ridge collapse can significantly compromise esthetics. Preservation of an adequate volume of bone is vital to successful implant placement. Ridge preservation achieved utilizing an acellular dermal matrix as a Barrier Membrane with a demineralized freezedried bone allograft has been previously reported. In this case presentation, guided bone regeneration was achieved around an immediate endosseous implant when this same technique was used. As in the previous case reports, this technique demonstrated an acceptable esthetic result with virtually no loss of ridge height or width. Soft tissue dimensions were also preserved. Both the hard and soft tissue grafts were well accepted by the body and healing was rapid and without significant discomfort. This surgical technique provides the clinician with an option to provide immediate implant therapy when primary closure cannot be achieved. J Periodontol 2000;71:1360-1364.
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ridge preservation utilizing an acellular dermal allograft and demineralized freeze dried bone allograft part ii immediate endosseous implant placement
Journal of Periodontology, 2000Co-Authors: Edward B Fowler, Lawrence G Breault, George RebitskiAbstract:When maxillary anterior teeth are extracted, subsequent ridge collapse can significantly compromise esthetics. Preservation of an adequate volume of bone is vital to successful implant placement. Ridge preservation achieved utilizing an acellular dermal matrix as a Barrier Membrane with a demineralized freeze-dried bone allograft has been previously reported. In this case presentation, guided bone regeneration was achieved around an immediate endosseous implant when this same technique was used. As in the previous case reports, this technique demonstrated an acceptable esthetic result with virtually no loss of ridge height or width. Soft tissue dimensions were also preserved. Both the hard and soft tissue grafts were well accepted by the body and healing was rapid and without significant discomfort. This surgical technique provides the clinician with an option to provide immediate implant therapy when primary closure cannot be achieved.
Lawrence G Breault - One of the best experts on this subject based on the ideXlab platform.
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ridge preservation utilizing an acellular dermal allograft and demineralized freeze dried bone allograft part i a report of 2 cases
Journal of Periodontology, 2000Co-Authors: Edward B Fowler, Lawrence G Breault, George RebitskiAbstract:Alveolar ridge deformities are usually the result of trauma, periodontal disease, surgical insult, or developmental defects. Preventing ridge collapse with the extraction of maxillary anterior teeth is vital to an esthetic restorative result. Several techniques are available to prevent ridge collapse. In these case presentations, ridge preservation was achieved utilizing an acellular dermal matrix as a Barrier Membrane with a demineralized freeze-dried bone allograft. This report demonstrated an acceptable esthetic result with no loss of ridge height or width. Soft tissue dimensions were also preserved. The two graft materials were well accepted by the body and healing was rapid and without significant discomfort. The technique illustrated provides the surgeon with another option to prevent ridge collapse and ultimately improve esthetics. J Periodontol 2000;71:1353-1359.
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ridge preservation utilizing an acellular dermal allograft and demineralized freeze dried bone allograft part ii immediate endosseous implant placement
Journal of Periodontology, 2000Co-Authors: Edward B Fowler, Lawrence G Breault, George RebitskiAbstract:When maxillary anterior teeth are extracted, subsequent ridge collapse can significantly compromise esthetics. Preservation of an adequate volume of bone is vital to successful implant placement. Ridge preservation achieved utilizing an acellular dermal matrix as a Barrier Membrane with a demineralized freezedried bone allograft has been previously reported. In this case presentation, guided bone regeneration was achieved around an immediate endosseous implant when this same technique was used. As in the previous case reports, this technique demonstrated an acceptable esthetic result with virtually no loss of ridge height or width. Soft tissue dimensions were also preserved. Both the hard and soft tissue grafts were well accepted by the body and healing was rapid and without significant discomfort. This surgical technique provides the clinician with an option to provide immediate implant therapy when primary closure cannot be achieved. J Periodontol 2000;71:1360-1364.
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ridge preservation utilizing an acellular dermal allograft and demineralized freeze dried bone allograft part ii immediate endosseous implant placement
Journal of Periodontology, 2000Co-Authors: Edward B Fowler, Lawrence G Breault, George RebitskiAbstract:When maxillary anterior teeth are extracted, subsequent ridge collapse can significantly compromise esthetics. Preservation of an adequate volume of bone is vital to successful implant placement. Ridge preservation achieved utilizing an acellular dermal matrix as a Barrier Membrane with a demineralized freeze-dried bone allograft has been previously reported. In this case presentation, guided bone regeneration was achieved around an immediate endosseous implant when this same technique was used. As in the previous case reports, this technique demonstrated an acceptable esthetic result with virtually no loss of ridge height or width. Soft tissue dimensions were also preserved. Both the hard and soft tissue grafts were well accepted by the body and healing was rapid and without significant discomfort. This surgical technique provides the clinician with an option to provide immediate implant therapy when primary closure cannot be achieved.
Daniel Buser - One of the best experts on this subject based on the ideXlab platform.
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Combination of Collagen Barrier Membrane with Enamel Matrix Derivative-Liquid Improves Osteoblast Adhesion and Differentiation.
The International journal of oral & maxillofacial implants, 2017Co-Authors: Richard J Miron, Masako Fujioka-kobayashi, Dieter D. Bosshardt, Daniel Buser, Yufeng Zhang, Anton SculeanAbstract:PURPOSE: Collagen Barrier Membranes were first introduced to regenerative periodontal and oral surgery to prevent fast ingrowing soft tissues (ie, epithelium and connective tissue) into the defect space. More recent attempts have aimed at combining collagen Membranes with various biologics/growth factors to speed up the healing process and improve the quality of regenerated tissues. Recently, a new formulation of enamel matrix derivative in a liquid carrier system (Osteogain) has demonstrated improved physico-chemical properties for the adsorption of enamel matrix derivative to facilitate protein adsorption to biomaterials. The aim of this pioneering study was to investigate the use of enamel matrix derivative in a liquid carrier system in combination with collagen Barrier Membranes for its ability to promote osteoblast cell behavior in vitro. MATERIALS AND METHODS: Undifferentiated mouse ST2 stromal bone marrow cells were seeded onto porcine-derived collagen Membranes alone (control) or porcine Membranes + enamel matrix derivative in a liquid carrier system. Control and enamel matrix derivative-coated Membranes were compared for cell recruitment and cell adhesion at 8 hours; cell proliferation at 1, 3, and 5 days; and real-time polymerase chain reaction (PCR) at 3 and 14 days for genes encoding Runx2, collagen1alpha2, alkaline phosphatase, and bone sialoprotein. Furthermore, alizarin red staining was used to investigate mineralization. RESULTS: A significant increase in cell adhesion was observed at 8 hours for Barrier Membranes coated with enamel matrix derivative in a liquid carrier system, whereas no significant difference could be observed for cell proliferation or cell recruitment. Enamel matrix derivative in a liquid carrier system significantly increased alkaline phosphatase mRNA levels 2.5-fold and collagen1alpha2 levels 1.7-fold at 3 days, as well as bone sialoprotein levels twofold at 14 days postseeding. Furthermore, collagen Membranes coated with enamel matrix derivative in a liquid carrier system demonstrated a sixfold increase in alizarin red staining at 14 days when compared with collagen Membrane alone. CONCLUSION: The combination of enamel matrix derivative in a liquid carrier system with a Barrier Membrane significantly increased cell attachment, differentiation, and mineralization of osteoblasts in vitro. Future animal testing is required to fully characterize the additional benefits of combining enamel matrix derivative in a liquid carrier system with a Barrier Membrane for guided bone or tissue regeneration.
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comparative study of biphasic calcium phosphates with different ha tcp ratios in mandibular bone defects a long term histomorphometric study in minipigs
Journal of Biomedical Materials Research Part B, 2008Co-Authors: Simon Storgard Jensen, Dieter D. Bosshardt, Michael M Bornstein, Michel Dard, Daniel BuserAbstract:Three biphasic calcium phosphate (BCP) bone substitute materials with hydroxyapatite (HA)/tricalcium phosphate (TCP) ratios of 20/80, 60/40, and 80/20 were compared to coagulum, particulated autogenous bone, and deproteinized bovine bone mineral (DBBM) in Membrane-protected bone defects. The defects were prepared in the mandibles of 24 minipigs that were divided into four groups of six with healing times of 4, 13, 26, and 52 weeks, respectively. The histologic and histomorphometric evaluation focused on differences in amount and pattern of bone formation, filler degradation, and the interface between bone and filler. Collapse of the expanded polytetrafluoroethylene Barrier Membrane into the coagulum defects underlined the necessity of a filler material to maintain the augmented volume. Quantitatively, BCP 20/80 showed bone formation and degradation of the filler material similar to autografts, whereas BCP 60/40 and BCP 80/20 rather equaled DBBM. Among the three BCP's, the amount of bone formation and degradation of filler material seemed to be inversely proportional to the HA/TCP ratio. The fraction of filler surface covered with bone was highest for autografts at all time points and was higher for DBBM than BCP 80/20 and 60/40 at the early healing phase. TRAP-positive multinucleated cells were identified on BCP and DBBM surfaces without showing typical signs of resorption lacunae.
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the jumping distance revisited an experimental study in the dog
Clinical Oral Implants Research, 2003Co-Authors: Daniele Botticelli, Daniel Buser, Tord Berglundh, Jan LindheAbstract:Abstract: Following tooth extraction, a socket often presents dimensions that may be considerably greater that the diameter of a conventional implant. The present experiment was performed to study the healing that occurred adjacent to implants placed in recipient sites with a wide marginal defect. Four Labrador dogs were used. In the right side of the mandible, four experimental sites were prepared to receive titanium implants [sandblasted, large-grit, acid-etched (SLA) surface]. Traditional implant installation (control) was performed in one site. In the remaining three sites (test), a step drill was used to widen the marginal 5 mm of the canal. Following placement of an implant in a test site, a circumferential gap about 1–1.25 mm wide and 5 mm deep was present lateral to the implant. A resorbable Barrier Membrane was used to cover the implant and the bone tissue of two sites, while one site was left uncovered. Four months following implant installation, block biopsies of each implant site were obtained and prepared for ground sectioning. After 4 months of healing, the large marginal defect had been filled with newly formed bone. The degree of bone-to-implant contact between the newly formed tissue and the SLA surface was at all test sites high and similar to that obtained at control sites. The placement of a Barrier Membrane following implant installation did not improve the outcome of healing. We conclude that a marginal defect wider than 1 mm may heal with new bone and a high degree of osseointegration to an implant designed with a SLA surface.
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lateral ridge augmentation using different bone fillers and Barrier Membrane application a histologic and histomorphometric pilot study in the canine mandible
Clinical Oral Implants Research, 2001Co-Authors: Thomas Von Arx, Daniel Buser, Robert K Schenk, David L Cochran, Joachim S HermannAbstract:Lateral ridge augmentation has become a standard treatment option to enhance the bone volume of deficient recipient sites prior to implant placement. In order to avoid harvesting an autograft and thereby eliminating additional surgical procedures and risks, bone grafting materials and substitutes are alternative filler materials to be used for ridge augmentation. Before clinical recommendations can be made, such materials must be extensively studied in experimental models simulating relevant clinical situations. The present pilot study was conducted in three dogs. Different grafting procedures were evaluated for augmentation of lateral, extended (8 x 10 x 14 mm) and chronic bone defects in the mandibular alveolar ridge. Experimental sites received tricalcium phosphate (TCP) granules or demineralized freeze-dried bone allograft (DFDBA) particles. Barrier Membranes (ePTFE) were placed for graft protection. These approaches were compared to ridge augmentation using autogenous cortico-cancellous block grafts, either with or without ePTFE-Membrane application. After a healing period of six months, the sites were analyzed histologically and histomorphometrically. Autografted sites with Membrane protection showed excellent healing results with a well-preserved ridge profile, whereas non-protected block grafts underwent bucco-crestal resorption, clearly limiting the treatment outcome. The tested alloplastic (TCP) and allogenic (DFDBA) filler materials presented inconsistent findings with sometimes encapsulation of particles in connective tissue, thereby reducing the crestal bone width. The present pilot study supports the use of autografts with Barrier Membranes for lateral ridge augmentation of extended alveolar bone defects.
Tao He - One of the best experts on this subject based on the ideXlab platform.
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selective separation of copper and nickel by Membrane extraction using hydrophilic nanoporous ion exchange Barrier Membranes
Process Safety and Environmental Protection, 2018Co-Authors: Jianfeng Song, Xuemei Li, Tao HeAbstract:Abstract Hydrophilic nanoporous ion exchange Barrier Membrane, based on polyethersulfone (PES)/sulfonated polyphenylether sulfone ketone (SPPESK), was utilized for the pH dependent separation of copper and nickel ions with a commercial extractant, LIX84-I. The extraction and stripping performance of the Membrane was demonstrated in a single stage Membrane contactor as well as in an integrated extraction/stripping system. By adjusting the feed pH to 2.9, a complete separation of copper and nickel was achieved using the Membrane contactors, where a copper flux of 1.10 × 10 −8 mol/cm 2 s was observed. In an extraction/stripping integrated sandwiched Membrane extraction contactor, significantly higher copper flux was observed due to the coupling of copper stripping. In addition, the PES/SPPESK Barrier Membrane prevented the loss of the organic extractant, exhibiting high stability in 30 days dynamic test. The results indicated that the Membrane extraction contactor system is of great potential for selective extraction of metal ions.
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solvent stable nanoporous poly ethylene co vinyl alcohol Barrier Membranes for liquid liquid extraction of lithium from a salt lake brine
Journal of Membrane Science, 2016Co-Authors: Jianfeng Song, Tao He, Xuemei Li, Tao Huang, Lixin Xing, Zhansheng Li, Ying ChenAbstract:Abstract Loss of organic extraction in Membrane extraction process could be avoided by using an ion permeable, solvent stable Barrier Membrane. Development of solvent stable materials has been a key issue for liquid-liquid Membrane extraction. A new type of solvent resistant Membrane, prepared from block copolymer poly (ethylene-co-vinyl alcohol) (EVAL) via immersion precipitation, is introduced as the Barrier in Membrane extraction of lithium from a real salt lake brine. The influence of EVAL concentration on the casting solution viscosity and the Membrane properties was investigated. The Membranes were characterized by scanning electron microscopy (SEM), water uptake, pure water flux, mechanical strength, and Li + diffusion flux. Membrane phase separation was conducted at a temperature below the crystallization temperature of the polymer to ensure suitable Membrane structure. The Membrane prepared from 30 wt% EVAL content showed a Li + flux of 2.7×10 −8 mol cm −2 s −1 at a Li + feed concentration of 0.1 mol/L in a diffusion test. Using a tributylphosphate (TBP)/kerosene extractant, the lithium flux in a Membrane extraction showed a linear relationship with the feed lithium concentration. In addition, long term stability tests showed a stable lithium extraction flux for about 1037 h. These results indicate that EVAL material is a promising stabilizing Barrier Membrane in liquid-liquid extraction of lithium.
