17930250
Description
Mind Map by Alice Dolman, updated more than 1 year ago
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Created by Alice Dolman
about 5 years ago
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Explain, with the use of diagrams,how to
sprue porcelain crowns forpressable
ceramic materials
- Sprues are attached to the wax veneer or crown patterns and invested using a special refractory investment to
produce a mould, capable of being injected with the E.Max Lithium Disilicate ceramic ingots.
- Sprue to the incisal edge using the sprue ring provided. If more
than one investing, place restorations opposite each other on the
ring.
- The Sprue should be at the correct angle, ensure your restoration follows the same angle. This should then be
between 45-60̊ to the base.
- sprue diameter- 2.5- 3mm
- Attachment point- thickest part of wax up (generally cusps)
- Sprue angle- axial
- Design of attachment points- rounded and slightly tapered, no sharp
angles or edges
- Design of attachment points- rounded and slightly tapered, no sharp
angles or edges
- Sprue angle- axial
- Attachment point- thickest part of wax up (generally cusps)
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