Extracoronal semi-precision dental attachment.
1. What would be the best way to describe an ERA?
Extracoronal semi-precision attachment/Universal hinge with vertical resiliency.
2. What is the biggest contradiction about an ERA?
The biggest contradiction is that the ERA is not appropriate for case designs requiring rigidity in function.
3. How can the female be placed closer to the die?
If necessary some or all of the contoured retention plate may be removed to better position the female in the wax.
4. Which alloys should be used with the female of the ERA?
Cast using a hard alloy. Minimum Vickers hardness of 200 and at least 85,000 psi ultimate tensile strength. Appropriate choices are Pegasus ceramic alloy and Sterngold 100 crown and bridge alloy for yellow gold castings.
5. What are the levels of retention of the ERA Males?
Black fabrication male and six color coded males offer a consistent level of retention. From smallest button diameter to largest button diameter they are as follows..white, orange, blue, grey, yellow and red.
Males easily changed without use of autopolymerizing acrylic.
Two Extra Oversized Males for greater retention in problem cases – yellow has a larger button than the grey; red has a larger button than the yellow.
Standard and reduced vertical (ERA®-RV) size males. Both size males fit the same female.
Universal hinge with vertical resiliency.
Black fabrication male with built-in spacer
Male – retained directly in processed denture acrylic or an ERA® Metal Jacket.
Female – cast as part of crown pattern.
Optional ERA® Metal Jacket holds the attachment male in the denture base and is sold pre-loaded with a black fabrication male.
Black fabrication male and six color coded males for a consistent level of retention. From smallest button diameter to largest button diameter they are as follows..white, orange, blue, grey, yellow and red.
Nylon male, plastic pattern female.
Standard 2,5 mm, Micro 2 mm
Nero, Bianco, Arancione, Blu, Grigio, Giallo, Rosso