Clinical evidence and Science 11 Since the introduction of two-piece dental implants, a lot of different types of implant-abutment connections (IAC) have been put on the market. Nowadays, internal connections are state-of-the-art with few maintenance requirements over time (e.g., retightening of screws). Technically, these are classified as either butt-joint or conical connections. Both types of connection are well-established on the dental implant market and are proven to be clinically successful. A significant impact of one of these connection types on crestal bone level changes lacks documentation (1). Important is a high precision of the connective part of the implant and abutment leading to a stable connection. In addition, the design of the connection must transmit and distribute the masticatory load and provide sealing capacity or at least minimal micromovement. The Tube-in-Tube® connection – CAMLOG® Implant System The well-known Tube-in-Tube® connection characterizing the CAMLOG® Implant System is a butt-joint connection with three symmetrically arranged interlocking grooves on the implant side and corresponding cams on the abutment as positional index design (Fig. 6). The tubular design allows an easy and safe insertion of the abutment into the implant and optimal positioning by the index design. Its special geometric design and precision of manufacturing ensures virtually perfect force and torque distribution as evidenced by some of the following publications. Fig. 7_CONELOG® implant-abutment connection with the index design at the bottom of the taper Fig. 6_Tube-in-Tube®, the CAMLOG® implant-abutment connection with the typical grooves and cams The Tube-in-Tube® butt-joint and the CONELOG® conical connections are well-established on the dental implant market and are proven to be clinically successful. SCIENCE BEHIND THE IMPLANT-ABUTMENT CONNECTIONS Abutment Abutment Abutment screw Abutment screw Conical implant-abutment connection Abutment guide in the implant Abutment guide in the implant Groove/cam design Groove/cam design Implant inner thread Upper inner thread Lower inner thread Implant Implant
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