Technique of Framework Cemented on Prepared Abutments to Obtain Passive Fit at Fixed Complete Denture: A 2-Year Follow-Up Report

Abstract

The passive fit of implant-supported dentures is fundamental to the rehabilitation success due the absence of the periodontal ligament in osseointegrated implants. Many techniques to obtain passive fit have been reported in the literature, some inaccessible for the clinicians and dental laboratories. This case report presents a technique to fabricate fixed complete dentures aiming at obtain passive fit with reduced time and cost, but without demerit for the aesthetics, function and longevity. A 40-year-old woman was referred for treatment presenting some teeth in the maxilla and an edentulous mandible, reporting eating problems related to instability and little retention of the mandibular complete denture. Treatment based on the reverse planning was performed to guide the rehabilitation with a complete mandibular fixed complete denture and maxillary occlusal plane adjustment. The framework of the fixed complete denture was manufactured luting a cast metal bar above the prepared titanium cylinder abutments using resin cement. The aim of this technique was to obtain a fixed complete denture with passive fit presenting positive esthetic and functional outcomes after 2 years of follow-up.

Tensile Strength of Resin Cements Used with Base Metals in a Simulating Passive Cementation Technique for Implant-Supported Prostheses

“…The cylinders are joined to the metal framework by physicochemical bonding. A passive cementing technique is a viable alternative, as well as others whose main purpose is the ability to compensate possible distortions in the metal framework that could generate undesirable loads to the implants (8,11).…”

“…After removing excess of cement, a 5 kg-load was applied over the samples for 10 min. Cements were cured with a halogen lamp (Ultralux; Dabi Atlante, Ribeirão Preto, SP, Brazil) at 450 mW/cm 2 for 20 s at each side (mesial, distal, buccal, lingual and occlusal) totaling 100 s for each sample, and maintained under a 5 kg load of for 10 min (4,8,11). The samples of Panavia F group were kept with an Oxyguard (Kuraray) layer at the margins during the same period.…”

Influence of Resin Cements on the Tension Force of Cast Frameworks Made by the Technique of Framework Cemented on Prepared Abutments

“…Perfect adaptation of the prosthetic components, also known as passive fit, is assumed to be one of the most significant prerequisites for the maintenance of the bone-implant interface (3,4). The adaptation of implant frameworks is determined by fabrication process and it could be jeopardized at any step of the entire clinical and laboratory procedures (5,6). The framework cemented on prepared abutments technique is based on the compensation of the shrinkage or deformation produced by casting (7).…”

“…After finishing and polishing procedures, the framework is luted to these abutments on an index cast using resin cement, and the framework and abutments assembly are tightened to the implants as a screw-retained prosthesis. The advantage of this technique is that the cylindrical abutments screwed to the implants are made by CAD/CAM, which presents a high level of adaptation, and the distortion originated by the framework casting is compensated by the resin cement layer, providing a more passive fit (1) and reducing cost and chair time (6).…”

“…A recent study presented a 2-year follow up clinical case using the technique of framework cemented on prepared abutment (6). However, little is known about the use of different resin cements and the tensile force that could result in failure due to loosening or separation of the abutments.…”