Evaluation of Marginal and Internal Fit at Implant-Abutment Interface of Original and Compatible Nonoriginal Abutments.

Is to measure the peripheral and internal gap at the implant-abutment interface of an implant system connected to its original or compatible non-original abutments. Twenty implants were assembled with four different types of abutments having the same conical internal interface. All abutments were considered compatible with Tx Astra Tech Implant SystemTM. Four groups were created and each group of five implants was connected to a different abutment; Ti DesignTM abutments (group A), DualTM abutments (group B), Natea plusTM abutments (group C) and ImplanetTM abutments (group D). The peripheral gaps between implant and abutment were observed in three points facing the flat surface of the abutment. The implant-abutment assemblies were then embedded in resin and grinded in the mesio-distal direction of the scalloped abutment margin using a diamond disk at very low speed and under water-cooling. The inner aspect of the implant abutment interface was observed in three different points, on the coronal border of the connection, in the middle area and on the apical border of the implant-abutment interface. The mean gap width was 0.543 ± 0.09 μm for group A and, respectively, 0.708 ± 0.1232 μm, 0.726 ± 0.0891 μm and 0.818 ± 0.0851 μm for groups B, C and D. When comparing group, A to B and C, a highly significant difference in numbers was obvious while an even higher variation was observed with group D. External and internal fit of components is better when using original components.