Subperiosteal implant

October 7, 2011 | By | Reply More

Subperiosteal implant

Definition

Implant with a removable superstructure. Cobalt/chromium casting that is inserted between the periosteum and the bone to support a denture.

History

The first subperiosteal implant was placed by Dahl in Sweden in 1943 and this technique was employed until the early 1980s.  The technique was slowly discontinued and replaced by blade-vent implants and subsequently by endosseous implants.

Advantages

This technique provided additional support and retention in an atrophic ridge situation. Whilst the implants had a reasonable success rate at five years it dropped dramatically after this period.

Disadvantages

• The technique involved the taking of an impression of the underlying bone, necessitating a surgical procedure, and a subsequent procedure to place the metal casting.

• Bone resorption progressed and therefore these frameworks soon no longer fitted the underlying bone

• Commonly infections tracked down the implant post causing infections in the underlying bone and exposure of the metal casting.

Procedure

1. A surgical procedure was carried out to expose the bone and an impression of this was made.

2. This was then used to cast a cobalt/chromium framework which was placed under the periostium; sometimes anchorage screws were placed to secure it to the underlying bone. This was allowed to heal and a casting which had previously been made to fit the implant posts was incorporated into the denture base.

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Category: Dental, Prosthodontics

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