Today the use of digital technology can make this duplication much easier. The restorative dentist goes through the exact same process of making a final impression and creating properly contoured provisional restorations as well as making an impression of the provisional restoration. The laboratory will then scan the master model as well as the approved provisional model. The lab will then “marry” the images so that they can see the exact three dimensional contours over the digital master cast (Figures 16-17). These restorations can then be virtually designed, ensuring from the centric stop to the incisal edge position that the critical contours are duplicated (Figure 18). It should be noted that if doctors are using one of the digital impression scanning systems, the final impression and the approved provisional can be easily scanned. This will save a step in the dental laboratory. From this point the laboratory can either mill the copings, or use a 3D printer. In this case the copings were printed (Figure 19). This facilitated the utilization of a micro cutback technique on the facial to enhance the esthetic result. The resin copings were then invested, and the crowns were pressed using the IPS all ceramic system.
early 13c., "apparatus for weighing," from Old French balance (12c.) "balance, scales for weighing," also in the figurative sense; from Medieval Latin bilancia , from Late Latin bilanx , from Latin (libra) bilanx "(scale) having two pans," possibly from Latin bis "twice" + lanx "dish, plate, scale of a balance." The accounting sense is from 1580s; the meaning "general harmony between parts" is from 1732; sense of "physical equipoise" is from 1660s. Balance of power in the geopolitical sense is from 1701. Many figurative uses are from Middle English image of the scales in the hands of personified Justice, Fortune, Fate, etc.; . hang in the balance (late 14c.).