Shown: Smart in the posterior, and Shiner Regular in the anterior
Magnets have become very popular as retainers for removable prosthesis overdentures for both root and implant abutments. The advantages of magnetic retention over either bars or stud attachments are:
No specific path of insertion is required (good for limited dexterity patients)
No abutment parallelism is required
Soft tissue undercuts may be engaged
Potentially pathologic lateral or rotating forces are basically eliminated providing maximum abutment protection
One word of warning
Magnets provide only retention– not prosthesis stability!
Prosthesis stability should be achieved from denture base extension, other abutments like stud attachments, or any combination of the above.
The Shiner SR “Stress Resistant” Magnet system allows free rotation of the magnets in the housing, resulting in up to 24 degrees of root or implant correction.
This movement between the magnet and housing permits non-destructive movement of the prosthesis.
The rotation between the magnet and housing allows for constant contact–and retention–between the magnet and keeper, even when the prosthesis moves during function.
Both a regular and mini size magnet are available. The mini magnet is reduced in size by 30% for when space is limited.
The regular magnets may be used with both the regular and mini tooth pieces; the mini magnet may also be used with the regular and mini tooth pieces.
The neodymium rare earth II magnet has an indefinite life for long lasting retention. The regular size magnet provides a minimum of 1.5 lbs of retention, and the mini system provides a minimum of 1 lb of retention.
Both magnets are double encapsulated with a stainless steel material to eliminate corrosion.
Regular keeper4.0mm diameter, 6.9mm length
Mini keeper3.5mm diameter, 3.6mm length
Regular Magnet5.5mm diameter, 3.4mm vertical height
Mini Magnet3.9mm diameter, 2.4mm vertical height
No abutment parallelism required
No path of insertion/removal required
Undercuts may be engaged
No wear, no servicing requirements
Overdentures may be root supported, or Implant supported
The Shiner SR system provides ideal retention and abutment protection for maxillary and mandibular overdentures. No abutment parallelism is required. The prosthesis flange must be adapted to the ridge and undercut to ensure prosthesis stability. The magnet system works especially well with implants as magnets control lateral loading.
It is important to note that not all magnets are alike or equal. The Shiner Stress Directing Magnet system has no equal and is patented generations ahead of other magnets. It is closed field to eliminate external magnetic flux; is the ONLY dental magnet to be TOTALLY encapsulated to prevent corrosion; provides an ideal 1.5 lbs of retention (1.0 lbs for the mini); and freely rotates to permit nondestructive movement of the prosthesis while providing constant retention.
The Shiner system is truly a system utilizing a compliment of auxiliaries and tools to provide ease of proper magnet to keeper alignment and contact. The system provides for direct keeper placement in a root or incorporation into a cast coping. The system is also totally implant compatible.
Shiner “SR” Magnet Systems