Locator Implant Bar InstructionsPREAT Corporation
Universal hinge, resilient attachment for bar splinted endosseous implants.
The Locator Bar Attachment System is designed for use with overdentures or partial dentures retained in whole or in part by bar splinted endosseous implants in the mandible or maxilla.
Not appropriate where a totally rigid connection is required.
All components and instruments are supplied NON-STERILE. Tools and metal instruments may be sterilized following standard clinical procedures, prior to use.
Locator Males: The inadvertent re-use of Locator nylon males could cause loss of retention for the overdenture due to wear from previous use or damage during removal with the Locator Core Tool.
Locator Abutments: The inadvertent re-use of Locator abutments could contain patient contamination build-up and subsequent wear of the retention bands. This would result in the device to perform with improper fit and function which would result in loss of retention for the prosthesis.
1. LOWEST VERTICAL HEIGHT: The total height of the Locator Bar Attachment (abutment plus male) is only 2.5mm on a cast alloy bar.
2. LOCATING DESIGN: Self-locating design allows a patient to easily seat their overdenture without the need for accurate alignment of the attachment components.
3. RETENTION INSIDE AND OUT: The patented Dual Retention innovation provides the Locator Attachment with greater retention surface area than ever before available with other attachments. A combination of inside and outside retention ensures the longest lasting performance.
4. ROTATIONAL PIVOTING ACTION: The design of the pivoting Locator Male allows a resilient connection for the prosthesis without any resulting loss of retention. The retentive nylon maleremains completely in contact with the abutment socket while its metal denture cap has a full rangeof rotational movement over the male.
5. CHOICE OF THREE TECHNIQUES: The Locator Bar Attachment can be placed by any of the three popular techniques used by Dental Laboratories to fabricate an implant retained bar with attachments:
- Drill and tap the bar for a removable threaded Locator Bar Female connection.
- Laser weld a Locator Laser Bar Female to the bar.
- Cast-to the stainless steel Locator Cast-To Bar Female with gold alloy.
PLACEMENT OF THE LOCATOR BAR ATTACHMENT
The Locator Bar Attachment can be placed by any choice of the three following techniques used by a Dental Laboratory to fabricate a bar with dental attachments.
CAUTION: The most critical consideration in the proper placement of the Locator Bar Attachment on a milled or cast bar is that a minimum of 1.0mm of bar material remains between the edge of a screw retaining the bar and the Locator Bar Female, or a minimum of 5.0mm between the edges of multiple placed Locator Bar Females that is required to avoid interference of the Locator Titanium Denture Caps. (Locator Bar Female = 4.0mm Diameter, Locator Denture Cap = 5.5mm Diameter).
Technique to drill and tap a bar for a removable threaded Locator Bar Female
Technique with threaded castable insert for a removable threaded Locator Bar Female
Technique to laser weld a Locator Laser Bar Female on top of a bar
Due to the additional space allowed for laser welding, the total height of the Laser Bar Attachment is slightly higher (2.75mm) than the other types of Locator Bar Attachments at 2.5mm
The laser welding process does not affect the wear resistant titanium nitride coating on the Locator Laser Bar Female.
Technique for Casting a Locator Cast-to Bar Female into a gold alloy bar
- It is recommended to use debubblizer to reduce surface tension during investing procedures.
- Investing. The most successful castings have been accomplished by using Ceramigold Investment by Whip Mix Corp. or an equivalent High Heat Investment.
- Mix a liquid/powder ratio of Ceramigold using 12ml to 60 grams of powder for each packet of mix needed. Hand mix for 15 seconds and vacuum mix for 90 seconds at 350-450 RPM. The investment material should be carefully painted into each attachment cavity to avoid trapping bubbles and to prevent gold from going inside the female. The remainder of the investment poured into the ring will stabilize the female during burnout. Place the ring in a water bath for one hour, then bench set for a half hour.
- Burnout. Place ring in a cold furnace (sprue side down) and raise the temperature to 1500° F maximum. Use a rate of climb of 0° F to 1500° F maximum over a time period of one hour. Hold at 1500° F maximum until burnout is complete. (Refer to investment manufacturer’s instructions for suggested burnout duration.)
- Casting. Use only precious or semi-precious alloys for casting the stainless steel female into a bar. Non-precious alloys should not be used. Cast the bar using recommended temperatures of the alloy manufacturer. The stainless steel Cast-To Bar Female will withstand a temperature of up to 2000° F without any dimensional change. Do not allow casting temperature to raise above 2000° F which will melt the stainless steel Bar Female!
- Divesting. After casting, allow the casting to bench cool for 20 minutes. Be careful to push out the casting and investment with proper tools. It is not recommended to hammer or bang on rings that may distort the castings. To remove the investment material from the Cast-To Bar Female without damage to the stainless steel, use an acid-free investment and porcelain remover solution in an ultrasonic unit for a period of 30-45 minutes. (Do not use a bur to remove the investment, sandblasting with aluminum oxide, or an acid pickling solution, all of which can damage the retention surfaces of the Bar Female attachment.) Clean the bar containing the Locator Cast-To attachment in an ultrasonic cleaner solution, shell blast, bead blast, or use a Fibgerglass or Brass Pencil.
- Finishing and Polishing. When polishing with a rubber wheel, use caution not to damage the Cast-To Bar Female attachment. Polish the surface of the bar to make a smooth surface. The Locator Parallel Post can be placed on the female to protect the attachment while polishing. [If additional polishing of the female attachment is required, it is recommended to only use glass beads at a low pressure (40 PSI) or a fiberglass or bristle polishing brush.]
- After polishing the bar, place a Locator Processing Cap Male onto each Cast-To Bar Female and check for proper fit. Clean again in an ultrasonic solution and deliver to the dental office.
Processing the Males
Processing the males is the same as for the Locator stud overdenture cases. Block out the undercuts, specifically between the bar and the tissue
Place the two white blockout spacers over the female attachments. Snap on the Locator metal housing with the yellow processing insert. Proceed on to setting the teeth, boil out, and packing/processing procedures as normal for Locator attachments.