8/3/2019 666297A ERA Chart

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The ERA System

ERA PickUp will chemically bond to acrylic only if

a primer is used. Use SternVantage Varnish LC

as a primer for acrylic.

SternVantage Varnish LC#221001 30 ml bottle

ERA RV & MicroAppropriate for use with partial dentures

where a resilient prosthesis is indicated. The

ERA joint allows hinging around much of its

radius, therefore it may be an option even

where ridge alignment or abutment location

forces the attachments to diverge. It is

also well suited for use with direct bonded

retainers. The female component is a plastic

pattern which is incorporated as part of a

crown wax-pattern and cast in a hard alloy.

There are two male designs. The ERA RVMale is 2.5 mm in height and has vertical

resiliency. The Micro ERA Male needs about

0.5 mm less vertical space and 0.8 mm less

width in the dental arch. The ERA male also

has a projection which contacts the abutment

crown above the female eyelet. This resists

vertical displacement of the par tial dentures

distal extension saddle.

ERA Overdenture &

Micro OverdentureMay be used in both overdenture and partialdenture cases. Appropriate for use with

appliances where remaining non-vital roots

are to be utilized as abutments. The ERAOverdenture Attachment female is a plastic

pattern which is incorporated into the wax-pattern for a post and root cap coping. The

ERA Overdenture male is 2.6 mm

in height and has 0.4 mm ofvertical resiliency, just like the

ERA Partial Denture. The MicroERA overdenture male is only2.0 mm in height and 3.4 mm

in width while maintaining the0.4 mm ver tical resiliency.

ERA Direct OverdentureApplicable to both overdenture and partial

denture cases. Appropriate for use with most

appliances where remaining non-vital roots

are to be utilized as abutments. The ERA

Direct was designed specifically for chairside

use where the precision manufactured

female is cemented directly into the prepared

root. The stainless steel females are titanium

nitride coated and are made in a choice of

two post diameters and four post angles to

accommodate most patients needs. Thetwo post diameters are 1.3 mm and

1.7 mm and they are available

in 0 (straight),

5, 11 and 17.

To easily identify

the larger post,

the titanium nitride

coating extends

onto the post.

The same males

are used in the ERA Direct Overdenture

as in the Overdenture version.

ERA Implant AbutmentsAppropriate for use in overdentures or partialdentures retained in whole or in part by

osseointegrated implants. This version of

the ERA applies the overdenture attachment

concept to a series of titanium abutments

manufactured for popular implant fixtures.

The implant abutment is made of titanium

with a titanium nitride coating on the angled

portion of the female. The implant abutments

are available in 0, 5, 11 and 17, in various

cuff heights, implant types and implant

diameters. They are also available in standard

and micro. Again, the same overdenture

males used for patients with natural root

abutments are used in this application.

can be used both temporarily and permanently, is unique dueto its micro prosthetic head, ability to correct misangulation,

and its true vertical resiliency. In fact, the ERA Implant is

the only vertically resilient implant in the world that can

immediately stabilize a removable prosthesis.

The simplicity of its chairside application and its affordability

make the ERA Implant System a secure, reliable choice.

ERA Implant Surgical SystemIncludes all the tools and instruments

necessary to place ERA implants

#905119

ERA Implant Master Prosthetic Kit#811914

800-243-9942 508-226-5660

FREE SHIPPING for online orders at

www.sterngold.com

2.2 mm 3.25 mm 3.25 mm0 0 angled

ERA PickUp MaterialTissue-colored, self-curing

attachment processing material

#220235

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ERA AttachmentCommon Causes of Wear

The following suggestions from the dental laboratory technicians anddentists on our technical staff, as well as some of our field survey labs,will contribute to extending the life of the prosthesis, as well as patientcomfort and satisfaction.

Patient Consistently Bites the Overdenture Into PlaceThe patient should be instructed in how to insert the prosthesis intoplace with his/her fingers.

Cleaning Abutments or Females with an Abrasive CleanerToothpaste can be ver y abrasive. The patient should be instructed toremove all traces of toothpaste after brushing. The abrasive in sometoothpaste can cause extensive wear on the inside of the female whenthe male is inserted.

Denture CleanersPatients who use denture cleaner should be advised to follow themanufacturers instructions. Most require a soak time of only 10 to15 minutes then rinse and store overnight in only water. Patient shouldavoid leaving the overdenture in the cleaning solution for extended timeor overnight since many cleaners can have a detrimental effect on thesurface of the nylon males and cause them to loose their retention.The cleaning solution can actually attack the nylon of the males,causing it to soften in approximately 1-2 months. Solutions containingChlorine may cause the nylon males to become hard and brittle. This

will cause premature wearing of the males, and eventually, some wearof the females.

Insertion of the Blue or Grey Colored MaleThe insertion of the blue or grey males prematurely can cause excessivewear in the male and possibly the female. Keep in mind that the leastamount of retention required by the patient is best.

The dentist should always process the prosthesis first with the BlackFabrication Male, and then snap in the White Male Attachment which isthe least retentive. Then, if the patient wants more retention, the OrangeMale should be used. Only step up one degree of retention at a time.

ERAs and Tobacco ChewingSilica in the juices created by chewing tobacco can be very abrasive,and may be a cause of wear to the male and the female.

Pickup of Attachments ChairsideThe dentist should make sure that the patient does not bite down oncethe acrylic has been placed. We cannot determine the strength of apatients bite. Too much pressure can cause the tissue to be displaced.Once the acrylic around the male has set and the pressure relaxed, thetissue returns to a normal state raising the attachment slightly. This cancause the attachment to snap in and out constantly as the patient talksor chews, causing excessive wear of the male and the female. To avoidthis problem, have the patient bite passively, just enough to obtain theproper centric relationship. As patient relaxes bite, the dentist shouldpassively hold the prosthesis in place until the acrylic cures.

Fabrication Tips for Plastic FemalesDistal Extension (Reduced Vertical and Micro)

Although the ERA female is a plastic burnout pattern and can be cast invirtually any alloy, care should be taken to choose a hard alloy. The twomost important aspects to consider are Vickers hardness and UltimateTensile strength. These attributes will provide optimum retention and

long life of the female eyelet. A minimum Vickers of 200 and anUltimate Tensile of at least 75,000 psi is recommended.

OverdentureWe should pay particular attention to the Overdenture application ofERA. Prescriptions in these cases often request a yellow crown andbridge alloy. In choosing this kind of alloy, use a type IV metal that allowsyou to harden the finished casting to a high Vickers Hardness. Thereare many of these on the market today including Sterns Apollo, a 45%type III-IV that can be hardened to 240 Vickers. Hardening techniquesfor C+B metals are relatively standardized. First, anneal the finishedcasting by heating and quenching and then harden by heating and slowcooling. (Refer to specific alloys manufacturer for temperatures and

detailed hardening technique.) This is a simple step that can ensure asuccessful case.

WARNING: Great care must be taken when using debubblizers on plasticpatterns. These materials may present problems in investing and burnoutof the female ERA patterns. You must be sure that there are no puddles inour around the attachment. Also take care to fill the inside of the femalepattern with a small brush before investing the rest of the pattern.

Finishing the Cast FemalesFemales are divested in a normal fashion by either sandblasting lightlyor stripping in ultra-sonic solution. Care should be taken that the insideof the female is not over sandblasted as this will oversize the femaleeyelet. Glass beads or light polishing with rubber points can be usedto create a clean finished look to this interior surface. The outsidesurface is not a crucial dimension and can be rubber wheeled and

polished but should not require stone or carbide finishing.

ParallelismERA Attachments have been designed to function properly up to adivergence of 5. If the attachments are off by more than 5 you will notrealize maximum life span of the males and could incur considerablewear on the females along with displacement of the appliance.

Path of InsertionWe would like to stress the importance of a short flange in the anteriorregion. Appliances designed to engage the labial undercut will inter ferewith proper seating. In cases of deep labial undercut, it should beblocked out before the processing of the denture base. Engage no morethan 1 mm of undercut. Full extension of the flange into the vestibulewill still provide lip support and help prevent food entrapment. It isdesirable to provide full extension for stability whenever possible.

Intraoral Pickup of the ERA Males Using

ERA PickUp Material*

1. Snap the black fabrication male onto the female. Block out anyundercut areas, that can trap hardened composite material andprevent easy removal of the denture.

2. Using a round acrylic bur, create space in the denture base for themale. The denture should not touch the ERA male or the abutmentwhen seated. In short, the partial denture or overdenture mustseat passively without interference from the attachment. Youcan cut an observation window through the lingual flange into theattachment space to help you create the space. This window alsoallows excess composite to escape as the prosthesis is seated.

3. Create some mechanical retention in the recess by using a roundbur and cutting some undercuts into the recess. This will aid thecomposite in bonding to the acrylic.

4. Paint the inside of the recess with an unfilled resin, such asSterngolds Light Cure Varnish, and cure in a light box or with acuring light. This will create an oxygen inhibited layer and allow thecomposite to bond to the acrylic.

5. Place a tip on the tube of the ERA PickUp material and squirt someon the sides of the male and then fill the recess in the denture.

6. Seat the denture. Have the patient bite lightly to check theocclusion, then hold the denture in place with finger pressureuntil the composite sets. This establishes the correct resting

relationship between the attachment components. Ensure thatthe denture is passively seated.

7. Adjust the composite so it does not contact the abutment whenthe denture is in function. Recontour and polish the lingual flangewhere the observation window was cut.

A Dentists Guide to Changing the ERA Males

1. Place the Core Cutter into a straight handpiece.

2. Cut out the core of the male at medium rpm, using a short cuttingcycle and an in-and-out motion. Push in for about 1 second at atime, checking to see if the core has been removed. The core willremain in the Core Cutter and should be ejected by sliding a thinblade along the cutters side slot.

3. Using a blade or explorer-like instrument, collapse the remaining ringinto the open space created by removal of the core and lift it out.

4. Place a new male on the Seating Tool. Place the tool with the newmale into the recess in the acrylic and firmly push it in until issnaps securely in place.

Snap a white alignment handleinto other ERA Implants. Rotatethe angled ERA female until theyall line up with the desired path ofinsertion of the denture.

Mark a vertical line using an indeliblepen across the juncture between theimplant base and the ERA Female wherever space allows. Removethe females from the bases.

Add a small quantity of ERA LockCement into the socket of the baseand a small amount to the buttonon the bottom of the female.

Snap in the ERA Female, aligningthe two halves of the mark. Cleanup any excess cement.

ERA Angle Correction

* Order online at www.sterngold.com666297 Rev. A