Implant Attachment Pick-Up Technique for Converting a Denture into an Overdenture
A 60-year-old fully edentulous woman presented with an existing implant-retained overdenture requesting a new mandibular prosthesis. The implants (Osseotite Tapered Certain, Biomet 3i) had 3 mm tall LOCATOR abutments (ZEST Anchors) that were placed for her current prosthesis and she was satisfied with retention of the denture with the blue nylon inserts.
A new mandibular complete denture was fabricated with recesses that were slightly oversized using a processing spacer to accommodate picking up the LOCATOR denture caps directly inside the mouth. Block-out spacers were applied to the LOCATOR attachments, and denture caps snapped on top. A PVS fit-checking material (FIT-CHECKER ADVANCED, GC America) was mixed and applied to the intaglio surface of the denture, the denture was placed back into the mouth, and the material allowed to polymerize. Areas of show-through were marked with a blue pencil, and a pear-shaped acrylic resin bur was used to enlarge the recesses. An inverted cone bur was used to create undercuts and a #8 round bur was used to place a vent hole into the lingual surface of the denture.
The denture was air-dried and CHAIRSIDE Attachment Processing Material(ZEST Anchors) was injected into the denture recesses to fill two-thirds of the recess. A small amount of CHAIRSIDE was placed onto the denture caps and the denture was seated onto the edentulous ridge, ensuring complete tissue adaptation, and held with light finger pressure for 30 seconds so the material would flow out the lingual vent holes. A curing light was used for 10 seconds on the buccal and lingual surfaces of each attachment. The denture was removed and inspected. A small void was found around the denture cap at the No. 27 position. Additional CHAIRSIDE was placed into the void. Because the material bonds to itself without additional etch or primer, a 20-second light cure was used to set the material before making adjustments. The black processing males were removed and the lingual slope of the denture was polished using a polishing point and a rag wheel with pumice.
Blue nylon inserts were placed into the denture cap housings, inserted onto the tissue ridge, verifying complete adaptation. The denture was evaluated for retention and stability using finger and chewing pressure tests. The patient was seen 1 week later to evaluate retention and stability; no changes were needed to the inserts.