Cleaning an IPS e.max CAD restoration removes lubricating oil used during the milling process.  While oil is needed to cool the cutting tools and ceramic, oil incorporated on the prep may affect the bonding process or remaining on the crown may affect the the glaze.  When removing the crown from the mill and if it is tried in immediately, oil may be introduced to the prep which may negatively affect the bonding process.  If utilizing a total etch technique, probably not, but if using a self-etch primer the residual oil may.  Likewise, residual oil on the exterior of the crown may affect the glaze finish.  We performed a study tracing carbon (from the oil) after various cleaning techniques.  The results are as follows (higher % indicates the method removes the most carbon):

  • Ultrasonic in Alcohol: 97%
  • Soap, Tap Water and Toothbrush (2-3 minutes): 94%
  • Steam Cleaner (small jewelry cleaner): 89%
  • Ultrasonic in De-ionized Water: 86%
  • Wipe with Alcohol: 80%
  • Tap Water and Toothbrush (2-3 minutes): 53%

In summary,  ultrasonic cleaning removes the most, but soap, water, and a toothbrush or steam cleaner is almost equally effective.  

Posted from IvoCAD New, April 23,2012