Ivoclar Vivadent PS Empress CAD Chairside - Manual (Page 11)

11
Veneers
If possible, the preparation should be entirely located in the enamel. Do not locate the incisal preparation margins in the
area of the abrasion surfaces or dynamic occlusal surfaces. You can achieve a controlled enamel reduction by preparing
orientation grooves using a depth marker. You are not required to eliminate the proximal contacts.
For preparations without embrasure of the incisal edge (only labial reduction), observe a preparation depth of at least
0.6 mm in the cervical area and of at least 0.7 mm in the labial area.
For preparations with oro-incisal embrasure of the incisal edge (labial / incisal reduction), observe a preparation
depth of at least 0.6 mm in the cervical area and of at least 0.7 mm in the labial area. Reduce the incisal edge by 1.0 mm.
The extent of the incisal reduction depends on the desired translucency of the incisal area to be built up. The more
transparent the incisal edge of the intended veneer, the more pronounced the reduction should be. Discoloured teeth
may require more preparation.
Anterior and posterior crowns
Reduce the anatomical shape evenly while observing the given minimum thicknesses. Prepare a circumferential shoulder
with rounded inner edges or a chamfer. Observe a width of the circular shoulder/chamfer of at least 1 mm. Reduce the
crown third – incisal and/or occlusal – by 2 mm. For anterior crowns, reduce the labial and/or palatal / lingual part of the
tooth by at least 1.5 mm. Ensure that the incisal edge of the preparation is at least 1.0 mm (milling tool geometry) in order
to permit optimum milling of the incisal area during CAD/CAM processing.
2.0
> 0.6
> 0.7
>1.0
>1.0
1.5 1.5
>1.0
1.5
2.0 2.0
1.5
>1.0 >1.0
1.5
>1.5
4°
100-120°
>1.5 >1 5 >1.5
>1.5
>2.0
90°
>1.5
4°
>1.5
> 0.6
>0.7
>0.7
1.0
2.0
> 0.6
> 0.7
>1.0
>1.0
1.5 1.5
>1.0
1.5
2.0 2.0
1.5
>1.0 >1.0
1.5
>1.5
4°
100-120°
>1.5 >1 5 >1.5
>1.5
>2.0
90°
>1.5
4°
>1.5
> 0.6
>0.7
>0.7
1.0
2.0
> 0.6
> 0.7
>1.0
>1.0
1.5 1.5
>1.0
1.5
2.0 2.0
1.5
>1.0 >1.0
1.5
>1.5
4°
100-120°
>1.5 >1 5 >1.5
>1.5
>2.0
90°
>1.5
4°
>1.5
> 0.6
>0.7
>0.7
1.0
2.0
> 0.6
> 0.7
>1.0
>1.0
1.5 1.5
>1.0
1.5
2.0 2.0
1.5
>1.0 >1.0
1.5
>1.5
4°
100-120°
>1.5 >1 5 >1.5
>1.5
>2.0
90°
>1.5
4°
>1.5
> 0.6
>0.7
>0.7
1.0
2.0
> 0.6
> 0.7
>1.0
>1.0
1.5 1.5
>1.0
1.5
2.0 2.0
1.5
>1.0 >1.0
1.5
>1.5
4°
100-120°
>1.5 >1 5 >1.5
>1.5
>2.0
90°
>1.5
4°
>1.5
> 0.6
>0.7
>0.7
1.0
2.0
> 0.6
> 0.7
>1.0
>1.0
1.5 1.5
>1.0
1.5
2.0 2.0
1.5
>1.0 >1.0
1.5
>1.5
4°
100-120°
>1.5 >1 5 >1.5
>1.5
>2.0
90°
>1.5
4°
>1.5
> 0.6
>0.7
>0.7
1.0