implants the journal of oral implantology United Kingdom Edition

I 27 clinical _ guided implantology I implants2_2012 the implant threading pattern (bone density for initial screwing, whether or not a crestal bone drill has been used) and bone density gradient, or anisotropy for the subsequent axis. Accepting inaccuracy, manufacturers and researchers have created depth-control systems in the hope of offering certainty about this parameter at least, but the gap will be responsible for not only position and axis deviations, but also depth errors. In fact, the implant mount endo-stop will match up with the sleeve at an angle. The first contact willbebeyondthedesireddepth,andkeeping on screwing the implant will create a great torque with surgical guide deformation and tension on the bone. The complete contact will correspond to a deeper implant position than desired. The correct depth may be half- way (maybe operator dependent and deter- mined using the naked eye). Depth error, axis deviation and translation in crestal position in the axial deviation direction will be the re- sults. The likelihood of ideally positioning two implants is one out of seven billion and 500 million possibilities (just a few million less, if it is any comfort to us). And this evaluation comes from a 0.1mm mean deviation and 1° deviation, which implies insufficient inac- curacy. Fancy what the chances would be of achieving acceptable accuracy. _Thread timing and implant phase From a mathematical perspective, it is possible to describe all implant spatial coor- dinates concentrated on the platform, where we can summarise everything, and calculate its trajectory to create kind of a spiral path, through which it is possible to start and stop an implant platform along all the parameters, thus being able to truly speak of implant- guided prosthodontics. The idea is based on the following: when screwing a coca-cola plug onto the bottle- neck, the final position will always be the same. Once two final positions have been found, two threads will be inside the plug; once three final positions have been found, three threads will be present on the plug. The label written on the plug can be considered to be a hex (or a trilobe). So the hex, that is the platform, can easily be reproduced in its position because the thread pattern and hex are indexed to each other. This means that if we can control the threading pattern, we can consequently control the platform posi- tion too. According to this consideration, all the parameters that define the platform po- sition can be controlled. The parameters are the position in the arch (B-L and M-D), the Fig.13a Fig.13b Fig.14a Fig.14b Fig.14c Fig.15 Fig 13a&b_Coca-cola screw plug analogy. Fig 14a_Euler’s formula. Fig 14b&c_Euler’s formula in applied mathematics. Fig 15_JVertical clearance paragon.