Side-by-side comparison of Dental Alloys

Dental alloys are used for a casting a range of restorations, copings, frames and more. These alloys can be composed of a range of noble, high noble and base metals, and each mixture offers different properties that can make one alloy ideal for a specific restorative situation and another alloy completely unsuited to the same task. Full contour crowns and bridges are most often case from noble and high noble metals such as gold and platinum, but these softer metals might not be suited for posterior crowns on a bruxing patient. A wider range of alloys can be used for casting copings and substructures for porcelain-fused-to-metal (PFM) restorations. It is important to coordinate the alloy and the ceramic systems being used for a PFM restoration. Casting dental alloys requires specific techniques with different alloys melting at different temperatures, so be sure to follow the protocols that deliver the best results for your lab.


Company	Ivoclar Vivadent Inc.	Ivoclar Vivadent Inc.	Ivoclar Vivadent Inc.	Ivoclar Vivadent Inc.	Ivoclar Vivadent Inc.
Item	Midigold 50 Crown and Bridge Alloy	IPS d.SIGN 91 Porcelain Alloy	Lodestar Porcelain Alloy	Spartan Plus Porcelain Alloy	X-L Crown and Bridge Alloy
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Description	Midigold 50 is a reduced gold crown and bridge alloy demonstrating outstanding properties.	IPS d.SIGN 91 is an extra hard reduced gold ceramic alloy. Its mechanical and physical properties are coordinated with the IPS d.SIGN fluorapatite	Lodestar is a silver-free reduced gold ceramic alloy demonstrating outstanding properties.	Spartan Plus is a palladium-based ceramic alloy demonstrating outstanding properties.	Clinically proven reduced gold crown and bridge alloy demonstrating outstanding properties.
Composition	Gold: 50 % Palladium: 3.5 % Silver: 35 % Copper: 9.5 % Indium: 2 % Iridium: Less Than 1 %	Gold: 60 % Palladium: 30.6 % Indium: 8.4 % Gallium: 1 % Rhenium: Less Than 1 % Ruthenium: Less Than 1 %	Gold: 51.5 % Palladium: 38.5 % Indium: 8.5 % Gallium: 1.5 % Ruthenium: Less Than 1 % Rhenium: Less Than 1 %	Palladium: 78.8 % Copper: 10 % Gallium: 9 % Gold: 2 % Lithium: Less Than 1 % Germanium: Less Than 1 % Iridium: Less Than 1 %	Gold: 61.7 % Palladium: 3 % Silver: 25.2 % Copper: 9.6 % Indium: Less Than 1 % Iridium: Less Than 1 %
Hardness	180 HV	250 HV	240 HV	310 HV	140 HV
Tensile Strength	470 N/mm²	108 N/mm²	98 N/mm²	97 N/mm²	415 N/mm²
Indications for Use	Onlays 3/4 Crowns Crowns Telescope And Conus Crowns Posts Short And Long Span Bridges Implant Superstructure	Onlays Inlays Partial Crowns Single Crowns Telescope And Conus Crowns Root Canal Posts Short And Long Span Bridges Implant Superstructures Model Casts	Onlays Inlays 3/4 Crowns Crowns Telescope And Conus Crowns PFM Crowns Posts Short And Long Span Bridges Implant Superstructures Partial Dentures	Onlays Inlays 3/4 Crowns Crowns Telescope And Conus Crowns PFM Crowns Posts Short And Long Span Bridges Implant Superstructures Partial Dentures	Onlays Inlays Partial Crowns Single Crowns Telescope And Conus Crowns Root Canal Posts Short And Long Span Bridges
Color	Yellow	White	White	White	Yellow
Melting Interval	825° C - 915° C	1,175° C - 1,305° C	1,215° C - 1,290° C	1,130° C - 1,210° C	890° C - 950° C
Casting Temperature	970° C - 1,030° C	1,360° C - 1,420° C	1,350° C - 1,410° C	1,260° C - 1,320° C	1,005° C - 1,065° C
Expansion	6 %	31 %	20 %	20 %	26 %
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