Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.
Implant Dent. 2013 Feb;22(1):91-6. doi: 10.1097/ID.0b013e31827daf55.
To determine the stress pattern generated through various thread design in experimental simulation models, when loaded immediately after placement and after osseointegration.
Three-dimensional (3D) models were designed using CATIA, computer-aided design modeling software. The study was planned in 2 stages. Eight 2D models were constructed of different thread forms, one set with frictionless and other with bonded for bone to implant interface and loaded vertically with 100 N. In Stage II, 6 3D models of the different threads embedded in the cortical bone were constructed and loaded vertically and obliquely.
In 2D models, the von Mises stress concentrated at the crest in the bonded connection thread designs. The stress levels were in the range of 7 to 13 MPa. In the frictional implant bone interface, the thread designs had a clear effect on the stress levels in the bone. In the 3D analysis, the complete implant design affected the stress levels.
The thread design affects the magnitude of the stress peak in the bone more effectively in immediately loaded (frictionless) implants than the osseointegrated (bonded) implants. Maximum stress was observed at the first thread in most of the osseointegrated implants.
在即刻负载和骨整合后，通过实验模拟模型中各种螺纹设计来确定产生的应力模式。
使用 CATIA 三维（3D）设计软件设计三维模型。研究分为两个阶段进行。构建了 8 个具有不同螺纹形式的二维模型，一组具有无摩擦和另一种具有骨与植入物界面的粘合，并垂直加载 100N。在第二阶段，构建了 6 个嵌入皮质骨中的不同螺纹的三维模型，并进行垂直和倾斜加载。
在二维模型中，在粘合连接螺纹设计中，von Mises 应力集中在嵴上。应力水平在 7 到 13 MPa 之间。在摩擦植入骨界面中，螺纹设计对骨中的应力水平有明显影响。在 3D 分析中，完整的植入物设计会影响骨中的应力水平。
与骨整合（粘合）植入物相比，螺纹设计在即刻负载（无摩擦）植入物中更有效地影响骨中的峰值应力大小。在大多数骨整合植入物中，最大应力出现在第一个螺纹处。
