Cone-morse implant connection system significantly reduces bacterial leakage between implant and abutment: An in vitro study

A. Baj, A. Bolzoni, A. Russillo, D. Lauritano, A. Palmieri, F. Cura, F. J. Silvestre, A. B. Gianni

Research output: Contribution to journalArticlepeer-review


Osseointegrated implants are very popular dental treatments today in the world. In osseointegrated implants, the occlusal forces are transmitted from prosthesis through an abutment to a dental implant. The abutment is connected to the implant by mean of a screw. A screw is the most used mean for connecting an implant to an abutment. Frequently the screws break and are lost. There is an alternative to screw retained abutment systems: The cone-morse connection (CMC). The CMC, thanks to the absence of the abutment screw, guarantees no micro-gaps, no micro-movements, and a reduction of bacterial leakage between implant and abutment. As P. gingivalis and T. forsythia penetration might have clinical relevance, it was the purpose of this investigation to evaluate molecular leakage of these two bacteria in a new CMC implants systems (Leone Spa®, Florence, Italy). To identify the capability of the implant to protect the internal space from the external environment, the passage of genetically modified Escherichia coli across implant-Abutment interface was evaluated. Four cone-morse Leone implants (Leone® Spa, Florence, Italy) were immerged in a bacterial culture for 24 h and bacteria amount was then measured inside implant-Abutment interface with Real-Time PCR. Bacteria were detected inside all studied implants, with a median percentage of 3% for P. gingivalis and 4% for T. forsythia. Cone-morse.

Original languageEnglish
Pages (from-to)203-208
Number of pages6
JournalJournal of Biological Regulators and Homeostatic Agents
Issue number2, Supplement 1
Publication statusPublished - Jun 1 2017


  • Bacterial leakage
  • Bone resorption
  • Implant dentistry
  • Implant-Abutment connection
  • Perimplantitis

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Immunology and Allergy
  • Physiology
  • Immunology
  • Oncology
  • Endocrinology
  • Physiology (medical)
  • Cancer Research

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