Peter Gardell Time and time again there are reports of people having difficulty with the whole custom abutment process. They image , they design but when it comes to the fitting of the milled mesoblock they have problems with the seating. It will not seat as designed. The restoration is rotated, or it seems.
Immediately the clinician questions the whole process and figures that the software is at fault. As long as the Scanpost and Scanbody were seated properly you don’t have a problem. There is no fault. The software is trying to improve the final product. However, it doesn’t notify you of an adjustment it makes to improve milling performance.
Most reports that talk about difficulties come from individuals that are working off a model. They place a TiBase and a Scanbody and image, the TiBase remains on the analog. The mesoblock has the female notch in only one place, you cannot change the restoration position in the block in Mill Preview. The software will consider the geometry of the abutment and where the notch is. If the minimal thickness is impinged on, then the software will virtually rotate the implant to improve the situation.
In Mill Preview if you turn on the upper arch with display objects and look at it with the restoration off you can see the TiBase and, more importantly, the notch. It is in the same position as when you acquired it. Turn the model upside down and you will see how the notch of the TiBase is no longer in the same orientation as the Scanpost indicates (the longer point indicates where the notch should be). Looks wrong but in reality it is a modification for your benefit.
So the fit will be perfect. You just may have to take the TiBase off the model assemble the TiBase to the mesoblock and replace them on the model.
Trust the process. There is no better way to restore your implant patients!
