Creating the framework from the anatomic shape (Shrinking/Cutback)

WarningThis page documents exocad's software releases from 2015 on. See documentation for older versions

If your construction contains anatomic copings, reduced pontics/waxups, or overpress parts, the wizard will present you the "Shrinking" dialog. This screen allows you to reduce the anatomic shapes in order to create the framework. Note that we are talking about cutback for applying veneering material here such as ceramic.

WarningThis has absolutely nothing to do with the zirconia shrinking that occurs during the sintering process.

You may change the minimum thickness of the framework using Minimize thickness [1], within the margins defined for the material you selected.
The slider Depth [2] controls the amount of cutback – that is, the thickness of the ceramic layer you plan to apply on the framework.
Note that the minimal thickness will always be enforced, which means that in areas where the material thickness does not allow it, the cutback will be less than what is specified by [2].

Shrinking with AUTO SELECT Box - PIC.png

Partial shrinking

Dcad 08.jpg

You may exclude certain parts from the shrinking, which will then be kept in full anatomic shape. This is useful e.g. for creating lingual bands, or for designing a metal chewing surface if you don't have enough space for ceramic on the occlusal side. Check Exclude selected parts [3] – observe how the teeth then turn yellow, they are now responsive to mouse actions. "Paint" areas on the teeth using the left mouse button. These areas will be excluded from the shrinking.

HotkeyHold <SHIFT> to erase

The slider Brush thickness [4] controls the circumference of the brush used for marking.

You can mark all(the whole unit/s) or clear all by clicking[5].

To add a lingual or full band click [A] which will open a new window.

Height [B] - you can choose the height for the band

Select all around [D] and Select lingual parts [E] - here you can choose if you want a lingual band only or a band which encompasses the whole unit/s.

In some cases, it may be beneficial to have less reduction on the lingual side. You can achieve this result by setting the slider Lingual shrink [6] to a value below 100%. E.g. if you have set a depth of 1mm [2], and set [6] to 60%, then the shrinking will be just 0.6mm on the lingual side. By default, this lowered value is only applied to anterior teeth; to apply it to all teeth, uncheck Apply only to anterior teeth [7].

Click Apply [8] to perform the shrinking without switching to the next wizard screen, or click 'Next' to shrink and move on.