Porta Maximum

Au (70.0%)-based dental casting/ metal-ceramic alloy, Type 4

Porta Maximum

Porta Maximum is a high gold, copper-free universal alloy. The constituents in this alloy allow for a wide range of indications, especially for the milling and double crown techniques.

Indications*

  • Inlays
  • Onlays, 3/4 crowns, crowns
  • Telescope crowns, conus crowns
  • Bridges
  • Wide-span bridges
  • Cast posts / cores, bars, attachments
  • Partial dentures

Technical Data

Composition (%):  Au 70.0 | Ag 10.0 | Pt 10.0 | In 5.0 | Pd 2.5 | Zn 2.0 | Rh <1.0 
ISO  22674:2016
Type / Color 4 / Rich Yellow
Density (g/cm³) 16.2
Melting Range (Solidus/Liquidus): 910 - 1060 °C
Elastic Modulus (GPa): 98
  As Cast              Porcelain Fired        Hardened 
Vickers Hardness: 180                      190                            210
Tensile Strength (MPa): 560                      580                            600
0.2% Proof Stress (MPa):  380                      410                            460
Elongation (%): 10                         8                               7

 

Advantages

  • Cu-free
  • Wide range of indications
  • Good processing and polishing properties
  • Compatible with special ceramics
  • Tested biocompatibility

Processing Data

Investment Material:  Phosphate-bonded / Gypsum-bonded
Preheating / Burn- out Temperature: 700 °C
Crucible  Carbon crucible / Ceramic crucible
Casting Temperature: 1200 °C
Oxidation  °C/min/Vacuum: 800 / 10 / No
CTE: (25 – 500 °C): 16.2 x 10-6 /K
Laser Welding Wire: Portadur IN

*See TYPE CLASSIFICATION DUE TO PHYSICAL PROPERTIES

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