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

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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 ceramic here.

TipShrinking gingiva parts from REAX- Bridges: Shrinking the gingiva components

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

If anterior teeth from a Knut Miller library have been used, a reduced anterior tooth mould can be selected and adopted in the dropdown menu “Pre-reduced tooth library” [1].
Slider [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].

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Partial shrinking

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|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 [3] – observe how the teeth then turn yellow; they are now responsive to mouse actions. Drag and drop the mouse on the teeth to mark areas that will be excluded from the shrinking.

HotkeyHold <SHIFT> to erase

Slider [4] controls the thickness of the brush used for marking. Double click on the slider. This puts a collar on all the crowns of the restoration. To provide all crowns with only a lingual collar double click on the slider and simultaneously keep the “Ctrl” key pressed.

In some cases, it may be beneficial to have less reduction on the lingual side. You can achieve this result by setting slider [5] to a value below 100%. E.g. if you have set a depth of 1mm [2], and set [5] 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 [6].

Click „Apply“ [7] to perform the shrinking without switching to the next wizard screen, or click „Next“ to shrink and move on.

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If the checkbox “Cut back reduced mould again” [8] in the Expander Multi-level cut-back is activated, areas already cut back can be marked anew and then cut back.