Effects of repeated manual disassembly

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; 25 : 86-94. Aim To evaluate the positional stability of five commonly used implant-abutment complexes in vitro by measuring rotational, vertical, and canting changes after manual removal and reassembly. The dimension of rotational freedom influences the likelihood of screw loosening 1 and the stability of the implant-abutment joint is known to affect implant treatment success 2 . Vertical Deviations: Vertical discrepancies were significantly higher in the systems based on conical elements. Deviations in Angulation: No significant differences were observed between the implant systems investigated. Results Rotational Deviations: The CAMLOG ® Implant System produced the least rotational discrepancies. Rotational Discrepancy . Five implant systems were tested: S1, S2, S4, S5, and CAMLOG. Pe1, 2, and 3 represent results from three independent test persons. Figure adapted from Fig. 4 of Semper et al., 2010. Median Rotational Discrepancy . The CAMLOG ® Implant System showed a significantly smaller rotational discrepancy than any other implant system tested (**p<0.001). Data extracted from Semper et al., 2010. 1 de Barros Carrilho et al. Int J Prosthodont 2005;18:165–166 2 Salinas TJ. Pract Proc Aesthet Dent 2001;13:352 Conclusion Implant-abutment-connection design influences the rotational, vertical, and angular positioning accuracy. The CAMLOG ® Implant System performed best, showing the least rotational deviations among all users and all implant systems tested. 1.2 2.0 1.4 0.6 1.5 1.0 0.4 0.36 0.72 1.15 1.13 1.02 1.0 0.8 S1 S2 CAMLOG CAMLOG S2 S1 S4 S4 S5 S5 Median Rotational Discrepancy (deg) Rotational Discrepancy (deg) 0.2 0.5 0 0 Pe1 Pe2 Pe3 ** Effects of repeated manual disassembly and reassembly on the positional stability of various implant-abutment complexes: an experimental study SUMMARY: Rotational Stability of the CAMLOG ® Implant System is significantly greater than any other Implant System tested In-Vitro Study

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