PubMed · 7036233
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D L Johnson, R J Stratton, F J Wiebelt. Removable partial denture design (II).. https://pubmed.ncbi.nlm.nih.gov/7036233/
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Implant failure may complicate and lengthen a planned treatment. This article describes a modified stage I indexing technique for registering the position of an implant and replacing a failed implant, allowing prosthesis fabrication time and healing time to be coincidental. The clinician can proceed as originally planned with a minimal increase in overall treatment time.
Five types of removable partial dentures (two attachment dentures, two telescopic dentures and one clasp denture) were designed. The two attachment dentures were retained by the rigid-precision attachments with or without a stabilizing arm, and the two telescope dentures were retained with cone telescope crowns with or without cross-arch stabilization. The stresses acting on abutment teeth and denture bases and the movements of denture bases were investigated, and the influences of denture design were clarified. The stress acting on a terminal abutment tooth retained by a rigid-precision attachment or cone telescopic crown was larger than that acting on a terminal abutment tooth retained by a clasp. The attachment dentures tended to concentrate more stress at the terminal abutment tooth than did the telescopic dentures. The stress of denture base of an attachment denture and a telescopic denture was less than that of a clasp denture. There was no difference between the stresses of attachment and telescopic dentures. The displacement of the denture base tended to be less when the denture was designed with a rigid connection for the retainer and with cross-arch stabilization.
Accurate determination of the space defined by the physiological contouring of a complete denture (before and after implant surgery) is required during the treatment-planning phase for an implant overdenture. This determination assists in formulating the proper surgical treatment plan and in selecting the appropriate independent implant overdenture attachment. This article presents a technique that provides clear, visual space limitation analysis of the removable prosthesis. The described method allows the clinician to determine the available space before the implant or attachment is placed.