顶骨不同分区骨片材料力学参数差异

目的 明确顶骨不同分区骨片材料力学参数差异及其与厚度的关系。方法 将左侧顶骨分为上顶、侧顶及后顶3个分区并截取各分区骨片，利用准静态三点弯曲实验对骨片的极限载荷、极限载荷作用下的形变、弯曲强度及弹性模量进行检测，分析不同分区顶骨的材料力学参数差异，并探讨骨骼厚度与上述参数的相关性。结果 上顶、侧顶及后顶的厚度依次为上顶>后顶>侧顶(F=21.298,P<0.05)。极限载荷、弯曲强度及弹性模量在上顶(F=7.082)、侧顶(F=5.206)及后顶(F=77.748)组间差异均具有统计学意义(P<0.05)。极限载荷依次为上顶>后顶>侧顶。弯曲强度与弹性模量均为侧顶>后顶>上顶。极限载荷作用下的形变在上顶与侧顶两组间比较差异具有统计学意义(P<0.05)。极限载荷与厚度呈正相关(r=0.683,P<0.05),而弯曲强度(r=-0.467)及弹性模量(r=-0.646)均与厚度呈负相关(P<0.05)。结论 顶骨不同分区的材料力学参数及厚度均存在差异，极限载荷与厚度呈正相关，而弯曲强度与弹性模量均与厚度呈负相关。

Mechanical Parameter Differences in Different Partition of Parietal Bone

Objective To determine mechanical parameter differences in different partitions of parietal bone fragments and their relationship with the thickness. MethodsThe left parietal bones were divided into three partitions, i.e., upper parietal bone (UPB), lateral parietal bone (LPB) and posterior parietal bone (PPB), and the fragments from each partition were intercepted. The ultimate load of the fragments, deformation under ultimate load, bending strength and elastic modulus under ultimate load were detected by quasi-static three-point bending test, and the differences in material mechanical parameters of parietal bones in different partitions were analyzed, as well as the correlation between bone thickness and the parameters above. Results The thickness was as follows: UPB>PPB>LPB (F=21.298, P<0.05). There were significant differences in ultimate load, bending strength and elastic modulus among the UPB (F=7.082), LPB (F=5.206) and PPB (F=7.748, P<0.05). The ultimate load was as follows: UPB>PPB>LPB. The bending strength and elastic modulus were as follows: LPB>PPB>UPB. There were significant differences in deformation between the UPB and the LPB (P<0.05). The ultimate load was positively correlated with the thickness (r=0.683, P<0.05), while the bending strength (r=-0.467) and elastic modulus (r=-0.646) were negatively correlated with the thickness (P<0.05). Conclusions The mechanical parameters and the thickness of materials in different partitions of parietal bone fragments are different. The ultimate load has a positive correlation with the thickness, while the bending strength and elastic modulus have a negative correlation with the thickness.