摘要： 目的：用有限元分析我国知识产权纳米氟磷灰石聚醚醚酮（nFA/PEEK）拓展成微种植体的生物力学性能。方法：用MIMICS软件将上颌骨CT的DICOM数据删选出常用植入点第一磨牙近中区牙槽骨块，以60°、90°和120°角度植入微种植体。结果：ABAQUS仿真加载100~400 g正畸力获得微种体应变云图，显示应力集中于种植体颈部骨床，与加载力方向相吻合其最大应力为2 776 με，远离到0.393 mm区域降为0。沿着种植体长轴应力集中于骨皮质层并在远离1.2 mm处迅速衰减，松质骨内应力很小。随植入角度偏离90°越大其应力变小；应力在角度不变时均随加载增加而增大，nFA/PEEK应力在178.10~2 776.00 με范围之间比钛合金种植体偏大，以90°、400 g加载时为最大。结论：nFA/PEEK应力分布值符合Frost机械阈值理论，有利于骨沉积区，为其未来临床应用提供了力学依据。

关键词: 微种植体； , 纳米氟磷灰石聚醚醚酮； , 三维有限元分析

Abstract: Objective: The purpose of this study was to analyze biomechanical properties of poly-ether-ether-ketone biocomposited by nano-fluorapatite (nFA/PEEK) mini implant using a three-dimensional finite element software package. Methods: MIMICS software was applied to get CT data scanned maxillary bones in DICOM form. Alveolar bone block was further isolated, which mini-implant was clinically and commonly performed in mesial first molar areas. Mini-implants were inserted at 60°, 90° and 120° degrees respectively. Results: ABAQUS was used to load 100~400 g orthodontic force. The main stress was located bone bed around implant neck in an FA/PEEK microstrain nephogram. The maximum microstrain coincided with loading direction was 2 776 με, which was reduced to 0 in about 0.393 mm far away. Microstrain was focused in bone cortex layer coinciding implant axis, which was dropped in 1.2mm away. It was very small in the cancellous bone. The more deviation was from 90° implantation, the smaller strain was found. Stress in the same implant angle was found to be increased with more loading force. nFA/PEEK found larger than that of titanium alloy implant was in the range of 178.10~2 776.00 με, which maximum values was 400 g loading at 90°. Conclusions: The microstrain of nFA/PEEK is beneficial to bone deposition and coinciding with mechanical threshold theory of Frost. The findings provide solid basis in mechanics and have potential clinical benefits.

Key words: finite element analysis, nFA/PEEK, mini-implant

中图分类号: 

• R782.13