首页> 外文期刊>Clinical oral implants research >Immunohistochemical, tomographic and histological study on onlay bone graft remodeling. Part II: calvarial bone.
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Immunohistochemical, tomographic and histological study on onlay bone graft remodeling. Part II: calvarial bone.

机译:镶嵌式植骨重塑的免疫组织化学,断层扫描和组织学研究。第二部分:颅骨。

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OBJECTIVES: Little information is available on the molecular events that occur during graft incorporation over time. The calvarial bone (Cb) grafts have been reported to produce greater responses compared with other donor regions in maxillofacial reconstructions, but the scientific evidences for this are still lacking. The objectives of this study are (1) to study the morphological pattern of Cb onlay bone grafts and compare them with the biological events through immunohistochemical responses and (2) to establish the effects of perforations in maintaining the volume and bone density of the receptor bed. MATERIAL AND METHODS: Sixty New Zealand White rabbits were submitted to Cb onlay bone grafts on the mandible. In 30 rabbits, the receptor bed was perforated (perforated group), while for the remaining animals the bed was kept intact (non-perforated group). Six animals from each group were sacrificed at 5, 7, 10, 20 and 60 days after surgery. Histological sections from the grafted area were prepared for immunohistochemical and histological analyses. Immuno-labeling was found for proteins Osteoprotegerin (OPG), receptor activator of nuclear factor-kappabeta ligand (RANKL), alkaline phosphatase (ALP), osteopontin (OPN), vascular endothelial growth factor (VEGF), tartrate-resistant acid phosphatase (TRAP), Type I collagen (COL I) and osteocalcin (OC). The tomography examination [computerized tomography (CT) scan] was conducted just after surgery and at the sacrifice. RESULTS: The histological findings revealed that the perforations contributed to higher bone deposition during the initial stages at the graft-receptor bed interface, accelerating the graft incorporation process. The results of the CT scan showed lower resorption for the perforated group (P
机译:目的:关于移植物随时间推移发生的分子事件的信息很少。据报道,在颌面重建中,颅骨(Cb)移植物比其他供体区域产生更大的反应,但是仍然缺乏对此的科学证据。这项研究的目的是(1)研究Cb覆盖骨移植物的形态模式,并通过免疫组织化学反应将其与生物学事件进行比较;(2)建立穿孔对维持受体床的体积和骨密度的影响。材料与方法:60只新西兰大白兔在下颌骨上接受Cb覆盖骨移植。在30只兔子中,受体床是穿孔的(穿孔组),而其余动物的受体床则是完整的(非穿孔组)。在手术后第5、7、10、20和60天处死每组六只动物。准备移植区的组织学切片以进行免疫组织化学和组织学分析。已发现蛋白质的免疫标记为骨保护蛋白(OPG),核因子-κ配体的受体激活剂(RANKL),碱性磷酸酶(ALP),骨桥蛋白(OPN),血管内皮生长因子(VEGF),耐酒石酸酸性磷酸酶(TRAP) ),I型胶原蛋白(COL I)和骨钙素(OC)。在手术后和牺牲时进行断层扫描检查[计算机断层扫描(CT)扫描]。结果:组织学结果显示,穿孔在移植物-受体床界面的初始阶段促进了更高的骨沉积,从而加速了移植物的整合过程。 CT扫描结果显示,穿孔组的骨吸收较低(P <或= 0.05),两组在60天时骨密度均较高。免疫组化结果证实了这组证据,表明在穿孔组中发现了与血运重建和成骨相关的蛋白(VEGF,OPN,TRAP和ALP)。结论:这些发现表明,当接受床穿孔时,颅盖骨的骨量得到更好的维持,这可能是由于更有效的移植血管重建和更大的骨沉积所致。两组的骨吸收过程在术后20至60天达到峰值,但穿孔组的骨吸收过程明显减少。

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