In-vitro evaluation of the sealing capability of a novel cone-morse connection under dynamic loading.

Sealing capability of a novel cone-morse connection.

The micro-gap between the implant and the abutment could allow pathogenic bacteria, toxins, acids, and enzymes to pass through it. The accumulation of toxic products at the implant-abutment interface could produce to peri-implant tissue inflammation. This process could lead, with time, to marginal bone loss and delayed implant failures. The literature has shown that the sealing ability of cone morse implants is correlated with the angle and length of the connection, which influence their stability during function. The purpose of this study was to evaluate the sealing capability and leakage.  A  total of thirty implants respectively characterized by a novel cone morse connection (CM) compared with external (EH), and internal hexagon (IH) and, under dynamic loading. 30 implants, 10 of each group, (AoN Implants, Grisignano di Zocco, Vicenza, Italy) with dimensions 3 have been investigated and immersed in a customized stub equipped with an internal liquid storage device containing toluidine blue. Following that, a Lloyd 30K universal testing device loaded each specimen in a cyclic loading mode. All the implants were screwed and tightened as suggested by Manufacturer. The connected im-plant/abutments were positioned inside the vials and filled with toluidine blue and distal water solution. Each group underwent 1 × 106 cycles loading in a Hsine shape at 4 Hz and a 30° angle. The sealing capability and leakage were quantified dichotomously, measuring the presence or absence of toluidine blue, inside the implant connection. The implants' internal chambers remained intact, proving there was no wear and tear in the connection areas. The Mann-Whitney test used for the statistical analysis showed no differences between CM and IH; on the contrary, EH showed a significantly higher infiltration (30% of the samples). Within the findings of the present in vitro investigation, the cone morse joint design seems to ensure an efficient connection joint under a simulated conditions with no evidence of components wearing and microleakage infiltration. Under a translational point of view, these advantages could support a more efficient mechanical and biological performances for a clinical application of CM implants.