Straumann BLX is a novel implant system that has been proclaimed to provide an ideal primary stability in all types of bone. In the current study, the primary stability of the Straumann BLX implant systems with Straumann tapered effect (TE) implants have been comparatively assessed in bovine ribs by using a simultaneous sinus elevation and implant insertion model. In the study group, BLX (4.0 × 12 mm), TE (4.1 × 12 mm), BLX (4.5 × 12 mm), and TE (4.8 × 12 mm) were placed in each bony window, which resembles the sinus maxillaris. As a control, BLX and TE implants with the same sizes were inserted into the proximal diaphysis of the bovine ribs. A total of 40 implant insertions were performed. Stability was measured with resonance frequency analysis. In the study group, 4.8-mm TE implants showed significantly higher values compared with 4.5-mm BLX implants (P = .116). However, 4.0-mm BLX implants in the control group showed higher stability compared with 4.0-mm-diameter TE (P = .014). The primary stability of the BLX implants in the control group was significantly higher compared with the experimental group in both widths (P= .018 for BLX 4.0 mm and P = .002 for BLX 4.5 mm, respectively). The use of the TE design with a wide diameter in simultaneous implant placement with sinus lift could present higher implant stability quotient values and might be a more appropriate option for implant recipient sites with poor bone volume and quality. However, the advantage of BLX design in standard implant insertion protocols could be of value.

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