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Shim et al., 2015 Siadat et al., 2016 Vojdani et al., 2015 Wegner et al., 2013), whereas seven studies used splinted impression copings for open tray impressions (Amin et al., 2016 Bergin et al., 2013 Di Fiore et al., 2015 Gupta et al., 2017 Ono et al., 2013 Rutkunas et al., 2012 Selvaraj et al., 2016) and one study splinted conical transfer copings for closed tray impressions. All studies on digital implant impressions and digital and conventional implant impressions are summarized in Tables 4 and 5. Conclusions: The use of full-arch implant digital impressions represents a viable alternative to traditional impressions for the fabrication of implant-supported FDPs. Differences that were statistically significant emerged when the misfit values of central positions were compared with other values. The mean misfit value calculated after microscope examination was 38 ± 5 μm. Results: The Sheffield test did not show gaps in the framework–implant interfaces when the screw was completely tightened on the more distal implant for all the milled frameworks.
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The Wilcoxon sum-rank test was used to compare the misfit value among the different implant positions. The gaps among the frameworks and the implant analogs were measured using a microscope on the master model realized with a traditional impression.
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To clinically assess the fit, the Sheffield test was applied for all frameworks. Six months after the surgical procedure, ten intraoral full-arch digital impressions were performed to mill ten frameworks. Methods: One patient received a maxillary full-arch implant-supported FDP. The purpose of this study was to assess the fit of screw-retained milled frameworks on six implants realized from digital impressions through the Sheffield test. Sectioning and rejoining of the SDR splinting had no impact on the impression accuracy.īackground: Discordant opinions have emerged among clinicians and researchers regarding a digital impression for full-arch implant-supported fixed dental prostheses (FDPs). 003) compared with both control groups (C 25.0 μm, D 19.1 μm).Ĭonventional impression techniques for edentulous jaws with multiple implants are highly accurate using the new fotopolymerizing splinting material SDR.
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430) between the mean 3D deviations of the test groups A (17.5 μm) and B (17.4 μm), they both showed statistically significant differences (p <. The Wilcoxon matched-pair signed-rank test was used to compare groups. The impressions were measured directly with an optomechanical coordinate measuring machine and analyzed with a computer-aided design (CAD) geometric modeling software. Co., Alsip, IL, USA) acrylic resin and D (control): see C, additionally sectioned and splinted again with Duralay. Before the total 60 impressions were taken (open tray, screw-retained abutments, vinyl polysiloxane), they were divided in four groups: A (test): copings pick-up splinted with dental floss and fotopolymerizing SDR B (test): see A, additionally sectioned and splinted again with SDR C (control): copings pick-up splinted with dental floss and autopolymerizing Duralay® (Reliance Dental Mfg. The study aims to evaluate three-dimensionally (3D) the accuracy of implant impressions using a new resin splinting material, "Smart Dentin Replacement" (SDR).Ī titanium model of an edentulous mandible with six implant analogues was used as a master model and its dimensions measured with a coordinate measuring machine.