Classic ArticleAn evaluation of impression techniques for multiple internal connection implant prostheses
Section snippets
Material and methods
An acrylic resin model (Blue Star Type E; Breitschmid, Kriens, Switzerland) of a maxillary arch with 4 internal connection 3.75 × 10-mm implants (IOSS310; 3i Implant Innovations, Inc) was fabricated (Fig. 1, A). The 4 implants in the acrylic resin model were sequentially numbered 1 through 4 from left to right (Fig. 1, B). Forty-five identical 2-mm–thick custom impression trays were made with light-polymerizing composite methacrylate resin (Palatray XL; Heraeus Kulzer, Hanau, Germany), prepared
Results
Relative to intraoperator variability, for each of the distances between posterior and anterior implants in the definitive casts selected from groups NM, R, and M, the range of standard deviations of the 10 repeated measurements was 3.2 to 3.4 μm, while the range of the intra-class correlation coefficients was 0.93 to 0.96. The small standard deviations and the high values of the intra-class correlation coefficients indicate the reliability of the measurement method.
With the use of the profile
Discussion
In implant prosthodontics, a successful result can be achieved only when passively fitting prostheses are fabricated.10., 11. The application of undue torque to screws during attachment of the superstructure to the abutments may jeopardize the outcome. If a clinically passive fit is not achieved and the metal supporting structure is unstable intraorally, the metal framework is usually sectioned, repositioned, and soldered. To eliminate discrepancies in fit, including those not visually
Conclusions
Within the limitations of this in vitro study, casts retrieved from transfer impressions with nonmodified implant impression copings and with airborne-particle–abraded, adhesive-coated copings were statistically less accurate than casts from square impression copings joined together with autopolymerizing acrylic resin prior to the impression procedure.
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