PMID- 28708914 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Int J Oral Maxillofac Implants JT - The International Journal of Oral & Maxillofacial Implants IS - 1942-4434 (Electronic) IS - 0882-2786 (Print) IP - 4 VI - 32 PST - ppublish DP - 2017 PG - 822-829 LA - en TI - Misfit of Three Different Implant-Abutment Connections Before and After Cyclic Load Application: An In Vitro Study LID - 10.11607/jomi.5629 [doi] FAU - Gehrke, Sergio Alexandre AU - Gehrke S FAU - Delgado-Ruiz, Rafael Arcesio AU - Delgado-Ruiz R FAU - Prados Frutos, Juan Carlos AU - Prados Frutos J FAU - Prados-Privado, María AU - Prados-Privado M FAU - Dedavid, Berenice Anina AU - Dedavid B FAU - Granero Marín, Jose Manuel AU - Granero Marín J FAU - Calvo Guirado, José Luiz AU - Calvo Guirado J CN - OT - cyclic test OT - dental implant OT - implant-abutment interface OT - implant-supported prostheses OT - metallographic analysis AB - Purpose: This study aimed to evaluate the misfit of three different implant-abutment connections before and after cycling load. Materials and Methods: One hundred twenty dental implants and correspondent prefabricated titanium abutments were used. Three different implant-abutment connections were evaluated: Morse taper (MT group), external hexagon (EH group), and internal hexagon (IH group). Forty implants and 40 abutments were used per group. The parameters for the mechanical evaluation were set as: 360,000 cycles, load of 150 N, and frequency of 4 Hz. Samples were sectioned in their longitudinal and transversal axes, and the misfit of the implant-abutment connection was evaluated by scanning electron microscopy analysis. One-way analyses of variance, Tukey post hoc analyses (α = .05), and t test (P < .05) were used to determine differences between groups. Results: At the longitudinal direction, all the groups showed the presence of microgaps before cycling load; after cycling load, microgaps were reduced in all groups (P > .05). Transversally, only the MT group showed full fitting after cycling load compared with the other groups (EH and IH) (P < .0001). Conclusion: The application of cycling load produces an accommodation of the implant-abutment connection in internal, external, and Morse taper connections. In the longitudinal direction, the accommodation decreases and/or eliminates the gap observed initially (before load). In the horizontal direction, Morse cone implant-abutment connections experience a complete accommodation with the elimination of the gap. AID - 846996