An in vitro analysis of implant screw torque loss with external hex and internal connection implant systems.

@article{Piermatti2006AnIV,
  title={An in vitro analysis of implant screw torque loss with external hex and internal connection implant systems.},
  author={Jack Piermatti and Hoda Yousef and Allyn C Luke and Richard A Mahevich and Saul Weiner},
  journal={Implant dentistry},
  year={2006},
  volume={15 4},
  pages={427-35}
}
PURPOSE The purpose of this study was to examine, in a controlled environment, effects of connection design upon screw stability. Implant fixtures have 2 types of connections to the abutment: internal connection and external hex. Four implant systems were tested: Bio-Lok (external hex; Bio-Lok International, Inc., Deerfield Beach, FL); Zimmer (internal connection; Zimmer Dental, Carlsbad, CA); Nobel Biocare (external hex; Nobel Biocare USA, Inc., Yorba Linda, CA); and Astra Tech (internal… CONTINUE READING