Microleakage comparison of 3 different implant-abutment interface configurations

Materials and Methods: Implant systems with 3 different implant-abutment interfaces; 11-degree angle morse-tapered abutments (MegaGen) (n=10),  1.5-degree-angle cold welding abutments (Bicon) (n=10) and perpendicular hexagonal abutments (M.I.S) (n=10) were selected. The abutments were fixed onto implants with their relevant torque rachets and recommended torque forces. Inýtial dry weights of united implant-abutment specimens were measured, recorded and the specimens were stored into artificial saliva. Subsequent weight measurements were performed at the end of the 1st, 2nd, 3rd and 4th weeks and data were recorded.

Results: Highest microleakage values (11 mg) were obtained in hexagonal abutment group, followed by the morse-tapered group (9.7 mg). Lowest values were obtained in the cold-welding group (2.1 mg) (p<.001).

Conclusion: Cold welding type implant-abutment geometry was found to be the most accurate interface geometry for the prevention of microleakage.