Background: The implant-abutment connection (IAC) is known to be a key factor for the long-term stability of peri-implant tissue.
Purpose: The aim of the present in vitro study was to detect and measure the mechanical behavior of different IACs by X-ray imaging.
Materials and methods: A total of 20 different implant systems with various implant dimensions and IACs (13 conical-, 6 flat-, and 1 gable-like IAC) have been tested using a chewing device simulating dynamic and static loading up to 200 N. Micromovements have been recorded with a high-resolution, high-speed X-ray camera, and gap length and gap width between implant and abutment have been calculated. Furthermore, X-ray video sequences have been recorded to investigate the sealing capacity of different IACs.
Results: Out of the 20 implant systems, eight implant systems with a conical IAC showed no measurable gaps under static and dynamic loading (200 N). By contrast, all investigated implant systems with a flat IAC showed measurable gaps under dynamic and static loading. X-ray video sequences revealed that a representative conical IAC had sufficient sealing capacity.
Conclusion: Within the limits of the present in vitro study, X-ray imaging showed reduced formation of microgaps and consecutive micromovements in implants with conical IAC compared to flat IACs.
Keywords: contamination; cyclic load; dynamic load; fatigue; implant-abutment connection; microleakage; micromovement; static load.
© 2018 Wiley Periodicals, Inc.