Ivoclar Vivadent IPS Empress Esthetic - Manual (Page 17)

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Preparation guidelines and minimum thicknesses
Successful results with IPS Empress Esthetic can only be achieved if the guidelines below and minimum layer thicknesses
are strictly observed.
Inlays and onlays
Static and dynamic antagonist contacts must be taken into consideration. The preparation margins must not be located on
centric antagonist contacts.
A preparation depth of at least 1.5 mm and an isthmus width of at least 1.5 mm must be observed in the fissure area.
Prepare the proximal box with slightly diverging walls and observe an angle of 100 - 120° between the proximal cavity
walls and the prospective proximal inlay surfaces. For inlays with pronounced, convex cavity walls without adequate
support by the proximal shoulder, marginal ridge contacts should be avoided. Round out internal edges in order to prevent
stress concentration within the ceramic material. Eliminate the proximal contacts on all sides. Do not prepare slice-cuts or
feather edges.
For onlays, provide at least 2 mm of space in the cusp areas. On the vestibular side, the shoulder should be prepared with
a chamfer (10°-30°) to improve the aesthetic appearance of the transitions between the ceramic material and the tooth.
Partial crowns are indicated if the preparation margin is less than approximately 0.5 mm away from the cusp tip, or if the
enamel is severely undermined.
Empress Esthetic –
Practical Working Steps
IP
S
Dimensions in mm
Dimensions in mm