• An inviZion crown or bridge starts off with a normal sectional stone model.
• The model is then scanned and digitised using the sirona ineos scanner.
• A substructure to support the porcelain is then designed using CAD software
• An appropriate sized zirconia milling block is then placed and secured in the milling chamber
• The computer software now controls the milling machine to mill an exact reproduction of the computer design, only it is approximately 25% larger than required
• The milled substructure is next manually trimmed to remove the remaining material connecting it to the mounting plate. It is then fired at a precisely controlled temperature increase and decrease for 7 hours at a maximum tempreture of 1350 degrees centigrade.
• This controlled firing hardens the material and in doing so it shrinks to exactly the right size. It is no longer 25% larger.
• The substructure is now ready for the application of Vita VM9 veneering porcelain
|
