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目的:通过测量髁突颈后缘锚固钉植入位置骨皮质的厚度,为建立2种医用锚固钉植入髁突颈后缘拔出力的有限元模型分析提供数据参考。方法:在本院拍摄CT的成年患者中,随机选取116例,共232侧髁突,利用CT采集颌面部数据并测量髁突颈后缘骨皮质厚度。采用SPSS17.0软件包进行统计学分析。结果:232侧髁突颈后缘骨皮质厚度均值为2.05 mm,男性骨皮质厚度均值为2.04 mm,女性骨皮质厚度均值为2.05 mm,两者之间无统计学差异;20~34岁髁突颈后缘骨皮质厚度均值为2.05 mm,35~49岁均值为2.06 mm,≥50岁均值为2.03mm。经统计学分析,只有20~34岁和35~49岁2组比较无显著差异(P>0.05),其他2组之间均具有显著差异(P<0.05)。结论:本实验为建立2种医用锚固钉植入髁突后缘拔出力分析的有限元模型奠定了基础,骨皮质厚度与锚固钉的稳定性有着重要关系。
OBJECTIVE: To provide a data reference for the establishment of the finite element model of the trailing edge pullout force of 2 types of medical anchoring screws for the condylar neck by measuring the thickness of the cortical bone at the position of the posterior edge of the condyle. Methods: In our hospital, 116 adult patients with CT were randomly selected, and a total of 232 condyles were collected. The maxillofacial data were collected by CT and the posterior cortical bone cortex thickness was measured. SPSS17.0 software package for statistical analysis. Results: The average cortical bone thickness of the posterior condylar neck was 2.05 mm, the average cortical bone thickness of male was 2.04 mm, and the mean cortical bone thickness of female was 2.05 mm, with no significant difference between the two groups The mean posterior cortical bone thickness was 2.05 mm, the mean 35-49 years was 2.06 mm, and the average age ≥50 years was 2.03 mm. The statistical analysis showed that there was no significant difference between the two groups (P> 0.05) and the other two groups (P <0.05) only in 20 ~ 34 years old and 35 ~ 49 years old groups. Conclusion: This study lays the foundation for the establishment of two finite element models for the analysis of the trailing edge pull-out force of condylar condyles. The thickness of cortical bone has an important relationship with the stability of the anchoring nail.