Accuracy and primary stability of tapered or straight implants placed into fresh extraction socket using dynamic navigation: a randomized controlled clinical trial

Objectives To compare the accuracy and primary stability of tapered and straight implants undergoing immediate implant placement with dynamic navigation. Materials and methods Patients with compromised anterior teeth in maxilla were recruited and allocated randomly into (1) tapered implant group (TI group) and (2) straight implant group (SI group). Implants were inserted into fresh sockets with dynamic navigation. Three-dimensional platform deviation, apex deviation, angular deviation, insertion torque value (ITV) and implant stability quotient (ISQ) were recorded. Results Twenty patients with 20 implants were included. The overall platform, apex, and angular deviation were 0.87 +/- 0.35 mm, 0.81 +/- 0.34 mm, and 2.40 +/- 1.31 degrees, respectively. The accuracy was 0.86 +/- 0.26 mm, 0.76 +/- 0.33 mm, and 2.49 +/- 1.54 degrees for TI, and 0.89 +/- 0.44 mm, 0.88 +/- 0.36 mm, and 2.31 +/- 1.01 degrees for SI, with no significant difference (p = 0.85, 0.45, 0.76). Sagittal root position classification (SRP) class I may obtain greater error in numerical values in straight implants (0.97 +/- 0.47 mm vs. 0.6 +/- 0.16 mm, 0.92 +/- 0.36 mm vs. 0.73 +/- 0.36 mm, 2.48 +/- 1.19 degrees vs. 1.71 +/- 0.14 degrees). The overall ISQ was 60.74. ISQ was 60.48 for TI and 60.96 for SI, with no significant difference. Acceptable ITV (> 15 Ncm) was achieved in most of the included patients (SI 7/10, TI 9/10). Conclusions High accuracy and primary stability of immediate implant placement could be achieved both in tapered and straight implants with dynamic navigation systems.