Ivoclar Vivadent IPS Empress Esthetic - Manual (Page 23)

23
Correct sprueing:
The sprue and wax pattern should not be longer than 15–16 mm. Observe a 45–60° angle.
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Provide sprues in the direction of flow of the ceramic material.
Always attach the sprue to the thickest part of the wax pattern. The internal surface of the wax pattern points outwards.
Maximum sprueing height
45–60 °
45–60 °
45–60 °
The attachment points of the sprues must be rounded. Observe an angle of 45 - 60°.