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General preparation information
What is a Precision Attachment?
A precision attachment is a precision-machined male and female (key and lock) housing that connects a removable partial denture to fixed bridgework in cases where the fixed bridgework is not possible.
What are the Advantages of Precision Attachment Cases?
Precision attachment partial dentures are the very best restorations where fixed restorations are contraindicated. Several key advantages of this type of restoration:
• Cosmetic Appearance, avoids the need for unsightly clasps
• Maintainable Periodontal Health
• Longevity of Abutment Teeth
• Patient Comfort
• Questionable Teeth can be saved in a way that does not affect the case
• Longevity if they are lost in the future.
• Natural Tooth and/or Implant Abutments can Be Used
• Precision Attachment Partial Dentures Can Be Adapted to Compensate for Future
Changes in the Mouth
• Prevent bone resorption of the ridges under the partial denture
• Confer the highest degree of patient comfort.
Even though there are no locking mechanisms, a good precision attachment partial denture will not dislodge during normal function. The reason the partial denture does not continually fall out is because it is surveyed in two directions so that the path of insertion is different from the pull of the muscles and the action of the tongue and gravity. Although the partial cannot be dislodged during function, it can move in a vertical direction slightly to release the forces instead of passing along these forces to the abutment teeth. The result is physiologic stimulation of the abutment teeth and the edentulous ridges. Clinical experience has shown that this physiologic stimulation results in increased longevity of the abutment teeth, even when a few teeth are required to carry the load of an entire arch. The stimulation of the edentulous ridge also prevents the bone resorption that typically reduces tissue support for the partial denture. The tissue under a well-fitting precision attachment partial is typically healthy and firm. There is surprisingly little wear of attachments that are used in this manner, even after many years of function! While the prosthesis may require relining or alteration of the occlusion to compensate for changes, it is rarely necessary to adjust or replace the attachments on the partial. The partial denture is never kept in a glass overnight. It is worn 24 hours a day to prevent collapse of the musculature and the occlusion and only removed for cleaning and hygiene.