A Technique for Constructing a New Maxillary Overdenture to a Nonretrievable Implant Connecting Bar
The most frequent mechanical complications of the bar-implant-retained overdentures are loosening of the bar screws and the need to reactivate the retentive clips. This article describes a technique to construct a new maxillary overdenture to a nonretrievable round-profile implant connecting bar with 2 distally placed attachments. The retainer round-profile bar was nonretrievable due to a worn retaining screw head. Attachment transfer analogs are used to transfer the position of the attachments to the master cast. The technique allows the clinician to construct new overdentures without the need for removal of the implant connecting bar. Reduced chairside time, reduced treatment cost, and increased patient satisfaction are the major advantages of the technique.
Figure 1. Intraoral view of the patient. Figure 2. Assembled dummy spring pins and impression tools. Figure 3. The assemblies seated on the matrices of the distally placed attachments and two duplicating matrices placed on the round-profile bar. Figure 4. Two matrix analogs placed into the maxillary impression. Figure 5. Two duplicating matrices placed on the maxillary cast. Figure 6. Wax-up of maxillary framework on the investment cast. Figure 7. Maxillary framework cast with a chrome-cobalt alloy. Figure 8. Intaglio view of the finished maxillary denture. Figure 9. Intraoral view of the patient after treatment.
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