The Hader  Bar is a semi-resilient system that employs an individual custom-made bar with retentive sleeves that fit into an opposing prosthesis.  Two abutment teeth are required.  It is used in combination with crown and bridge restorations: 1) on teeth prepared for crowns requiring splinting, 2) as a retentive device for a post and core over denture restoration and 3) on a combination partial and crown and bridge system.  The Hader Bar is also often used as the retention in a implant case.

The Hader Bar takes up little or no tongue space.  The skirt of the bar can easily be modified to accommodate cases of considerable resorption.  Exact contouring helps reduce stress and trauma on abutments..

Laboratory and Office Procedures for a Partial Denture or Over denture

1. Prepare abutment teeth using standard crown and bridge procedures.  Polyvinyl or silicone impression materials are best for both accuracy   and trouble-free shipment.

2.  Johns Dental Crown and Bridge Laboratory will fit the crowns with the Hader Bar in place, and return them to your office for try- in.  Included with the completed crowns will be a custom tray and bite rim.
   
3.  In the office, the fit, margins, and occlusion of the crown are verified.  Establish the correct vertical using the bite rim.  The crowns are then pulled in a standard crown and bridge impression using the custom tray.
   
4.  In the laboratory, porcelain will be placed in the crowns, if required.  The Partial Laboratory will begin fabrication of the framework, leaving spaces for the clips which will later be cured into the acrylic.  The partial will be returned for try- in.  If no framework is required, the technician will build a wax denture try in over the Hader Bar and return it to your office
   
5.  Following the verification of try in, return the denture (partial or full) and the bar to Johns Dental for completion of the case.

A Hader Bar Kit includes two 5cm Plastic Profiles, six Plastic Riders, six processing jigs and a special tool for inserting the riders.  This tool is also used for simple replacement of clips in the office.  After Johns Dental prepares the first case, you will receive the balance of the kit for future cases and replacement of clips.

Prior to surgical and restorative procedures, It is recommended that a Preplanning Kit be used.

 The kit will help the dental team 

• Know the density of the bone on the mandible.
• Choose a restorative method that best fits the oral environment presented.
• Know where the implants should be placed for proper retention of the restoration.

For complete information, see the Preplanning Kit Technical bulletin by Johns Dental Laboratories.
The procedures for the restoring over an implant start at the point when the implants are ready to be uncovered by the restoring dentist.

1.  Prior to uncovering the implant, the decision will have been made to place a standard screw-in or a custom made insert.  Custom made is recommended in cases where non-parallelism is an extreme problem.  The Hader Bar can accommodate a small degree of non-parallelism.  Place the insert and take a polyvinyl siloxane impression.  Send the impression to Johns Dental Laboratories.

2. The technician will cast a Hader Bar to fit the inserts and snap on a bite rim.  The bar and bite rim will be returned to your office.
   
3. In the office, the Hader Bar will be screwed into the patient's moth.  Verify that it seats passively.  Establish the correct vertical using the bite rim.  Return the Hader Bar to the laboratory.
   
4.  John Dental Laboratories will set up the denture over the bar.  We recommend the use of Vita Pan teeth.  They ware made fully of composite material and match  Vita Lumin shades.  The denture and Hader Bar are returned to your office.
   
5. Once again, place the bar in the mouth. Seat the denture and verify the bite as well as the esthetics.  Return the denture to Johns Dental Laboratories for final processing.