Milling burs and systems and methods for performing quality control of the same

Abstract

Disclosed are example embodiments of a milling bur specifically designed to mill a dental prosthesis from a full-sintered zirconia blank. The milling bur comprises a milling tip configured to have a factor of safety of at least 2 by having a first coverage-percentage of grinding particles covering a surface area of the tip of the milling bur. The factor of safety is a number of times the milling bur can fully mill a dental prosthesis from a fully-sintered zirconia blank.

1 . A milling bur for milling a fully-sintered zirconia blank to create an on-demand dental prosthesis, the milling bur comprising:
 a shaft region, and   a tip region comprising a plurality of grinding particles embedded in a metal coating covering at least a portion of the tip region,   wherein a coverage-percentage of the grinding particles over a surface area of the tip region of the milling bur is at least 25%, and   wherein a mean height value of the grinding particles on the tip region of the milling bur is less than 35 microns.   
     
     
         2 . The milling bur of  claim 1 , wherein the coverage-percentage of the grinding particles over a surface area of the tip region of the milling bur is at least 33%. 
     
     
         3 . The milling bur of  claim 1 , wherein the coverage-percentage of the grinding particles over a surface area of the tip region of the milling bur is at least 40%. 
     
     
         4 . The milling bur of  claim 1 , wherein the coverage-percentage of the grinding particles over a surface area of the tip region of the milling bur is between 25%-55%. 
     
     
         5 . The milling bur of  claim 1 , wherein the coverage-percentage of the grinding particles over a surface area of the tip region of the milling bur is between 35%-60%. 
     
     
         6 . The milling bur of  claim 1 , wherein the mean height value of the grinding particles on the tip region of the milling bur is less than 30 microns. 
     
     
         7 . The milling bur of  claim 4 , wherein the mean height value of the grinding particles on the tip region of the milling bur is less than 30 microns. 
     
     
         8 . The milling bur of  claim 5 , wherein the mean height value of the grinding particles on the tip region of the milling bur is less than 30 microns. 
     
     
         9 . The milling bur of  claim 1 , wherein the mean height value of the grinding particles on the tip region of the milling bur is between 20-25 microns. 
     
     
         10 . The milling bur of  claim 4 , wherein the mean height value of the grinding particles on the tip region of the milling bur is between 20-25 microns. 
     
     
         11 . The milling bur of  claim 5 , wherein the mean height value of the grinding particles on the tip region of the milling bur is between 20-25 microns. 
     
     
         12 . The milling bur of  claim 1 , wherein the metal coating comprises a metal alloy coating. 
     
     
         13 . The milling bur of  claim 12 , wherein the metal alloy comprises nickel. 
     
     
         14 . The milling bur of  claim 1 , wherein the grinding particles comprise diamond particles.