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7 [1] Semper W, Heberer S, Mehrhof J, Schink T, Nelson K. Effects of repeated manual disassembly and reassembly on the positional stability of various implant-abutment complexes: an experimental study. Int J Oral Maxillofac Implants. 2010 Jan-Feb;25(1):86-94. [2] Semper-Hogg W, Kraft S, Stiller S, Mehrhof J, Nelson K. Analytical and experimental position stability of the abutment in different dental implant systems with a conical implant-abut- ment connection. Clin Oral Investig. 2013 Apr;17(3):1017-23. [3] Kim KS, Lim YJ, Kim MJ, Kwon HB, Yang JH, Lee JB, Yim SH. Variation in the total lengths of abutment/implant assem- blies generated with a function of applied tightening torque in external and internal implant-abutment connection. Clin Oral Implants Res. 2011 Aug;22(8):834-9. [4] Lee JH, Kim DG, Park CJ, Cho LR. Axial displacements in external and internal implant-abutment connection. Clin Oral Implants Res. 2014 Feb;25(2):e83-9. LITERATURE Tab. 1 : Vertical displacement, rotation, and canting moment for the six implant systems evaluated. S1: Conelog, S2: Nobel Active, S3: Ankylos C/X, S4: Astra Tech, S5; Straumann Bone Level, S6; Straumann Tissue Level. (1): Median – (2): (25% and 75% percentiles) – (3): * p < 0.05 versus other implant system. S1 S2 S3 S4 S5 S6 Vertical dis- placements (1) (2) (3) 3 μm (3 μm : 4 μm) *vs. S2, S3, S4, S5 6 μm (5 μm; 7 μm) *vs. S1, S3, S5, S6 2 μm (2 μm; 3 μm) *vs. S1, S2, S4, S5, S6 14 μm (9 μm; 18 μm) *vs. S1, S3, S6 20 μm (14 μm; 30 μm) *vs. S1, S2, S3, S6 4 μm (3 μm: 5 μm) *vs. S2, S3, S4, S5 Rotation (1) (2) (3) 0.40º (0.30º, 0.54º) *vs. S2, S3, S4 0.72° (0.39°; 0.98°) *vs. S1, S4, S6 0.74° (0.46°; 0.93°) *vs. S1, S6 0.84° (0.61°; 1.10°) *vs. S1, S2, S5, S6 0.47° (0.38°; 0.70°) *vs. S4 0.12° (0.08°; 0.44°) *vs. S2, S3, S4 Canting moments (1) (2) (3) 0.02° (0.02°; 0.03°) *vs. S2, S4, S5, S6 0.10° (0.07°; 0.17°) *vs. S1, S3, S6 0.05° (0.02°; 0.09°) *vs. S2 0.07° (0.04°; 0.12°) *vs. S1 0.09° (0.05°; 0.12°) *vs. S1 0.04° (0.03°; 0.08°) *vs. S1, S2 SCIENCE / CLINICAL RESEARCH Fig. 3: Spread of the canting (image taken from Semper Hogg et al. (2015)). CONELOG Nobel Ankylos C/X Astra Tech Straumann Straumann Active Bone Level Tissue Level Canting moment in ° 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Original publication in English: Semper Hogg W, Zulauf K, Merhof J, Nelson K. The influence of torque tighte- ning on the position stability of the abut- ment in conical implant-abutment connec- tions. Int J Prosthodon 2015;28(5):538-541 Dr. Wiebke Semper Hogg 2002–2007 Dentistry study, Charité – Universitätsmedizin Berlin 2008 Doctorate 2008–2010 Clinic for Oral and Maxillofacial Surgery, Implant Den- tistry & Special Prosthetics Department, Charité – Universitätsmedizin Berlin 2010–2012 Department for Oral and Maxillofacial Surgery, Cen- ter for Dentistry and Maxillofacial Medicine, Universi- ty Hospital Freiburg since 2014 Head of the Imaging and Facial Surgery Section, Department for Oral and Maxillofacial Surgery, Cen- ter for Dentistry and Maxillofacial Medicine, Universi- ty Hospital Freiburg