statement of problem: impacts and accidents are considered as the main fac- tors in losing the teeth, so the analysis and design of the implants that they can be more resistant against impacts is very important. one of the important nu- merical methods having widespread application in various fields of engineering sciences is the finite element method. among its wide applications, the study of ...

We report a case of fixation of a scaphoid fracture using an Acutrak(®) screw. This screw is cannulated and headless, which allows it to be implanted below the surface of the bone. It uses the same concept of variable thread pitch as the Herbert screw, but unlike the Herbert screw, is fully threaded, with continuously varying pitch along its length. This variable pitch creates constant compress...

The development of high-precision tapping operations involves predicting such accuracy. Very often, this requires expensive experiments. Numerical calculation methods, which have recently received wide application, make it possible to replace these experiments with computer simulations. However, modeling is now mainly associated determining the stresses and strength tools, for only cutting tool...

Abstract Modern manufacturers of tools for turning threads make them with a non-zero value the side rake angle cutting edge, which significantly increases their efficiency. The this is approximately equal to thread lead angle. However, today there lack theoretical research that would provide an algorithm calculating effect edge on one indicators accuracy - pitch diameter. Its particularly notic...

Abstract To study the effect of thread pitch on bolt loosening behavior with consideration fretting wear, experiments and finite element analysis were carried out to bolts different pitches. The experimental results demonstrate that wear existed surface. It caused a slow without nut rotation. With increases, clamping force will become smaller, so surface also decrease, indicating lager could in...

Implant success is achieved by the synergistic combination of numerous biomechanical factors. This report examines the mechanical aspect of implants. In particular, it is focused on macrodesign such as thread shape, pitch, width and depth, and crestal module of implants. This study reviews the literature regarding the effect of implant thread geometry on primary stability and osseointegration u...