US 12,402,990 B2
Method of machining a dental restoration with reduced contour falsification
Hans-Christian Schneider, Einhausen (DE); Franz Basler, Laudenbach (DE); and Daniel Weiss, Heddesheim (DE)
Assigned to Dentsply Sirona Inc., York, PA (US)
Appl. No. 17/641,128
Filed by DENTSPLY SIRONA Inc., York, PA (US)
PCT Filed Sep. 21, 2020, PCT No. PCT/EP2020/076235
§ 371(c)(1), (2) Date Mar. 8, 2022,
PCT Pub. No. WO2021/058417, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 19199323 (EP), filed on Sep. 24, 2019.
Prior Publication US 2022/0331074 A1, Oct. 20, 2022
Int. Cl. A61C 13/00 (2006.01); G05B 19/404 (2006.01); B23Q 15/00 (2006.01)
CPC A61C 13/0004 (2013.01) [A61C 13/00 (2013.01); A61C 13/0006 (2013.01); A61C 13/0022 (2013.01); G05B 19/404 (2013.01); B23Q 15/00 (2013.01); G05B 2219/45167 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A computer-implemented method of machining a dental restoration from a workpiece using a dental tool, comprising:
defining a target contour of the dental restoration;
further comprising:
predicting a deflection of the dental tool during pre-machining through a model based on one or more machining parameters, wherein the one or more machining parameters include a length of an overlap between the dental tool and the workpiece, and a machining force between the dental tool and the workpiece;
determining based on the predicting, one or more primary locations at which the target contour would have been damaged during pre-machining;
modifying the target contour or a corresponding machining path by adding an oversize of material substantially only at the one or more primary locations for preventing damage; and
pre-machining the workpiece based on the modifying the modified-target contour or the corresponding machining path.