A preformed device within an overdenture which connects to a precision or magnetic component on a tooth, root or implant abutments to improve retention and stability.
The advantages of magnetic retention over either bars or 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