An In Vitro Investigation Concerning the Bacterial Leakage at Implants With Internal Hexagon and Morse Taper Implant-Abutment Connections

Abstract:

Leakage at the implant-abutment junction (IAJ) is a major contributing factor for periimplant inflammatory reactions.
1 Gaps and cavities between the implant and the abutment acting as a bacteriological reservoir have been described.
2 The presence of a gap between implant and abutment may cause unfavorable stress distribution on connection components, implant, and crestal periimplant bone.
3 Microbial colonization of this microgap may result in bone resorption.
2 Implant manufacturers aim to reduce the leakage by reducing the mobility of the implant-abutment connection by constructing physically tight connections with a high level of precision in a submicrometer range.
1 Very little data regarding the analysis of the microleakage at the IAJ of different implant-abutment connections are present in the literature
1 Leakage within a short storage time (5 minutes)

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PURPOSE:

To evaluate, in vitro, the leakage observed in internal hexagon and Morse taper implant-abutment connections.

MATERIALS:

Ten specimens with internal hexagon and 10 with Cone Morse connection were used. The inner parts of 5 implants, per group, were inoculated with Pseudomonas aeruginosa (PS) suspension and 5 implants, per group, with Aggregatibacter actinomycetemcomitans (AA). The penetration of bacterial suspension into the surrounding solution was determined by observation of turbidity of the broth.

RESULTS:

In the internal hexagon implants, bacterial contamination was found in 2 of 5 implant-abutment assemblies seeded with the PS, and in the assemblies seeded with AA, the contamination was found in 3 samples, with a total of leaked assemblies in this group in 5 of 10. In the Cone Morse implants, bacterial contamination was found in 2 of 5 implant-abutment assemblies seeded with the PS, whereas in the assemblies seeded with AA, no contamination was found, with a total of leaked assemblies in 2 of 10.

CONCLUSION:

The data support a not significantly higher permeability to bacterial leakage and a lower infiltration rate of screw-retained abutment connections when compared to Cone Morse taper internal connections.

Full text sources: Implant Dentistry | Ovid

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