Section of Fixed Prosthodontics, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan.
Section of Implant and Rehabilitative Dentistry, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University, Fukuoka, Japan.
J Prosthodont Res. 2019 Oct;63(4):453-459. doi: 10.1016/j.jpor.2018.10.009. Epub 2019 Jul 24.
Much research has been invested in determining the effects of postoperative loading of implants and whether this loading contributes to implant failure, but the issue remains controversial. The present study aimed to elucidate whether cyclic lateral loading of an implant causes bone resorption or bone formation at various loading magnitudes, using a finite element method (FEM) and peri-implant morphologic and morphometric analyses.
An FEM model was created using Digital Imaging and Communications in Medicine (DICOM) data of rabbit tibia. For the animal study, implants were inserted into rabbit tibia and, after osseointegration, were subjected to lateral cyclic loading of 20N, 40N or 60N.
Bone-implant contact was significantly higher in both 40N and 60N groups. Bone-abutment contact (BAC) was extraordinarily observed in all experimental groups. Bone height was higher than the implant platform level at higher levels of loading (60N). Among the three experimental groups, those receiving 40N loading had the highest bone height and BAC. Larger BAC values were observed on the compressive side than the tensile side.
Peri-implant bone formation was enhanced with increased loading, with bone formation predominantly on the compressive side. BAC was highest in the 40N group, implying existence of a loading threshold for peri-implant bone formation and resorption.
大量研究致力于确定种植体术后负载的影响，以及这种负载是否会导致种植体失败，但问题仍然存在争议。本研究旨在通过有限元方法（FEM）和种植体周围形态和形态计量学分析，阐明种植体的循环侧向负载是否会在不同的负载大小下引起骨吸收或骨形成。
使用数字成像和通信在医学（DICOM）数据创建兔胫骨的 FEM 模型。对于动物研究，将植入物插入兔胫骨中，并在骨整合后，对其进行 20N、40N 或 60N 的侧向循环加载。
在 40N 和 60N 组中，骨-种植体接触明显更高。在所有实验组中都观察到了骨-基台接触（BAC）。在较高的负载水平下，骨高度高于种植体平台水平（60N）。在三个实验组中，接受 40N 负载的组具有最高的骨高度和 BAC。在压缩侧观察到比拉伸侧更大的 BAC 值。
随着负载的增加，种植体周围的骨形成得到增强，骨形成主要发生在压缩侧。在 40N 组中 BAC 最高，这意味着种植体周围骨形成和吸收存在一个负载阈值。
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