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Histological Analysis of Bone Repair in Mandibular Body Osteotomy Using Internal Fixation System in Three Different Gaps without Bone Graft in an Animal Model

机译:三种不同间隙中内固定系统颌骨体骨质术中骨修复的组织学分析

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摘要

The aim was to analyze histologically the bone repair in a mandibular osteotomy model with different gaps between the segments. Nine male rabbits who underwent osteotomies on the mandibular body were fixed with a 1.5 system plate and no bone graft; group 1 (2 mm gap between segments), group 2 (5 mm gap between segments), and group 3 (8 mm gap between segments) were included. After 8 weeks they were euthanized and the sample was processed for histological analysis. Group 1 showed advanced bone repair with cartilaginous tissue and cancellous bone, showing osteoblasts and type III collagenous fibers. In group 2, a more delayed ossification was observed, with an extensive area of peripheral ossifying cartilage and chondrocytes in greater number at the center of the defect; group 3 showed no evidence of ossification with fibrous tissue, a very low level of chondrocytes, and some bone sequestrate. We can conclude that, in this animal model, 2 or 5 mm gap in the osteotomy could be repaired as bone when fixation is used. The size of the gap is an important factor for the use of bone grafts considering endochondral ossification. This model can be used for graft analysis and related technologies.
机译:目的是分析组织学上骨质骨质图模型中的组织学上骨修复,这些模型与区段之间的不同间隙。九只雄性兔子在下颌骨上进行骨质体,用1.5个系统板和没有骨移植物固定;包括第1组(区段之间的2mm间隙),包括组2(区段之间的5mm间隙)和第3组(区段之间的8mm间隙)。 8周后,它们被安乐死,并将样品加工用于组织学分析。第1组展示了软骨组织和松质骨的先进骨修复,显示出骨细胞和III型胶原纤维。在第2组中,观察到更延迟的骨化,在缺陷的中心,在更大数量的外周性软骨和软骨细胞的面积较大;第3组没有证据表明纤维组织的骨化,软骨细胞水平非常低,以及一些骨螯合。我们可以得出结论,在这种动物模型中,在使用固定时,截骨术中的2或5mm之间的间隙可以被修复为骨。差距的大小是考虑到骨切割的骨移植的重要因素。该模型可用于移植和相关技术。

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