J
Jeff Z
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Hello all,
For just over 9 months, my lab has been using the Preciso m200 mill. We have only ever used it for wax patterns (pfms, FGC, E-max, etc.). We use a 3Shape D700 scanner to scan all of our cases and then transfer them over with a direct connection. Also, we apply a light wax coating as a blockout on the dies before they get scanned to minimize any undercuts. Our cement gap is set at .03mm and our drill radius is set at .65mm.
Recently, we have had a few patterns come out not quite milled out enough on the inside of the crowns. It has only effected a few cases but it has been occurring more frequently over the last few days. At first, we thought it might be an insertion direction issue but after rescanning and designing each problem case, we found that it was not the case. It has occurred to several different types of cases as well, single-unit copings, multiple-unit bridges, and full contour crowns.
When looking at the inside of the milled out unit and the design on the computer, there are some very obvious differences with the way it looks. If there is any kind of edge or semi-sharp corner around the incisal edge, the Preciso does not mill it out. Even after blocking the edge out with wax and smoothing it out, it remains unmilled. It is really evident when milling out veneers. The incisal edges on the inside of the crowns will not be milled, causing the crown to not go all the way down on the model.
I understand that the smallest width the machine can reach is .6mm wide but our designs account for that with the drill compensation. What could be causing this rounding off of the inside of our patterns? Any help would be greatly appreciated!
Thanks!
For just over 9 months, my lab has been using the Preciso m200 mill. We have only ever used it for wax patterns (pfms, FGC, E-max, etc.). We use a 3Shape D700 scanner to scan all of our cases and then transfer them over with a direct connection. Also, we apply a light wax coating as a blockout on the dies before they get scanned to minimize any undercuts. Our cement gap is set at .03mm and our drill radius is set at .65mm.
Recently, we have had a few patterns come out not quite milled out enough on the inside of the crowns. It has only effected a few cases but it has been occurring more frequently over the last few days. At first, we thought it might be an insertion direction issue but after rescanning and designing each problem case, we found that it was not the case. It has occurred to several different types of cases as well, single-unit copings, multiple-unit bridges, and full contour crowns.
When looking at the inside of the milled out unit and the design on the computer, there are some very obvious differences with the way it looks. If there is any kind of edge or semi-sharp corner around the incisal edge, the Preciso does not mill it out. Even after blocking the edge out with wax and smoothing it out, it remains unmilled. It is really evident when milling out veneers. The incisal edges on the inside of the crowns will not be milled, causing the crown to not go all the way down on the model.
I understand that the smallest width the machine can reach is .6mm wide but our designs account for that with the drill compensation. What could be causing this rounding off of the inside of our patterns? Any help would be greatly appreciated!
Thanks!
