17930916
Description
Mind Map by Alice Dolman, updated more than 1 year ago
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Created by Alice Dolman
over 5 years ago
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What is the purpose of an opaqueporcelain
layer in the ceramo-metalprocess? Explain
what would happen ifthis layer is omitted
- These powders are used as the initial layer when constructing bonded restorations.
- Its function is to bond the porcelain onto the alloy and mask out the metal substructure.
- Its function is to bond the porcelain onto the alloy and mask out the metal substructure.
- Porcelain bonds to the metal substructure chemically, an oxide produced by Tin,
Indium, Zinc or Iron is incorporated in both the alloy and opaque powders which
produces molecular bonding.
- OPAQUE PORCELAIN: in metal-bonding porcelains, this porcelain powder is used for two reasons:
- 1. To bond the porcelain veneer to the metal substructure
- If the opaque porcelain layer is not applied then a
metal-porcelain failure will occur, this is when a fracture
occurs, leaving a clean surface on the metal due to no
oxides being present to adhere to.
- If the opaque porcelain layer is not applied then a
metal-porcelain failure will occur, this is when a fracture
occurs, leaving a clean surface on the metal due to no
oxides being present to adhere to.
- 2. To mask out the dark colour of the metal substructure
- Also opaque porcelains increase the brightness/value this adds to
the aesthetics of ceramics, without this layer the metal
substructure will be more visible, or harder to cover.
- Also opaque porcelains increase the brightness/value this adds to
the aesthetics of ceramics, without this layer the metal
substructure will be more visible, or harder to cover.
- 1. To bond the porcelain veneer to the metal substructure
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