CAMLOG and Science

CAMLOG&Science – Chapter 2 10 | 11 EFFECT OF CONNECTION DESIGN ON THE ACCURACY OF REPOSITIONING The theoretical calculations described above (Semper et al., 2009a; Semper et al., 2009b and Semper et al., 2010a) were also tested in an experimental in vitro study. Positional stability of five different implant systems (ITI, Steri-Oss, CAMLOG ® , Astra Tech, and Replace™Select) was compared after multiple manual disassembly and reassembly (Semper et al., 2010b). Five implants were arranged with varying angles in a stainless steel model to simulate a typical clinical situation (Fig. 7). Abutments were assembled and reassembled manually by three test persons for each implant system for 20 times by using system-specific screwdrivers. Any rotational, vertical, and canting deviation from the initially determined position was monitored using a coordinate reading machine. Rotational freedom ranged from 0.92 to 4.92 degrees. CAMLOG ® showed significantly smaller rotational discre- pancy than the other systems tested (Fig. 8A). The systems with a horizon- tal butt-joint displayed significantly lower vertical alterations in position than beveled implant-abutment connections (Fig. 8B). Regarding canting discrepancies, the implant systems did not differ significantly (Fig. 8C). The authors concluded that reposition of rotation-safe abutments on the implants leads to a three-dimensional deviation compared to the initial position and that the accuracy of repositioning is influenced by the geometric design of the implant-abutment interface. Fig. 7: Occlusal view of the five tested implant connections with their characteristic position indices: (A) ITI implant with conical-joint and octagonal positional index, (B) Steri-Oss implant with standard butt-joint and hexagonal positional index, (C) CAMLOG ® implant with butt-joint and cam positional index, (D) Astra Tech implant with conical-joint and dodecagram positional index, and (E) Replace™ Select implant with butt- joint and polygonal positional index. (Semper et al. (2010b) reproduced with kind permission of Quintessence Publishing co, Inc, USA).