Treatment of full and partial arches with internal‐ conical‐connection dental implants: Clinical results after 5 years of follow‐up

Diego Lops, Riccardo Guazzo, Alessandro Rossi, Antonino Palazzolo, Vittorio Favero, Mattia Manfredini, Luca Sbricoli, Eugenio Romeo

Research output: Contribution to journalArticlepeer-review


The aim of the present investigation is to evaluate the implant therapy outcomes over a period of 5 years and to analyze several patient risk factors influencing the stability of the peri-implant tissues. Seventy‐eight patients were consecutively treated between 2009 and 2017 and restored with implant‐supported fixed prostheses. The following inclusion criteria were considered: partial or complete edentulism; residual bone volume of at least 3.3 mm in diameter and 8 mm in length; a favorable relationship between maxilla and mandible; at least a minimum 5 year follow-up for each implant included in the statistical analysis. Intraoral radiographs were taken at implant loading and every 12 months during the follow‐up visits. They were subsequently stored on a personal computer and analyzed to determine the changes in bone level. Seventy‐eight patients receiving 209 implants completed a minimum follow‐up period of 5 years. One‐hundred dental implants were inserted in the maxilla while 109 were placed in the mandible. Eleven (14.1%) out of 78 treated patients who received 29 (13.9%) dental implants were considered as drop‐outs. On the whole, peri‐implantitis was diagnosed in three implants. The average final pocket probing depth at implant level was 2.5 ± 1.2 mm. The average final bone loss after 5 years was 0.3 ± 0.4 mm, both at the mesial and distal aspect of the implant. The effects of the prosthesis type, sex and implant site did not statistically influence the marginal bone loss; on the contrary, a statistically significant difference regarding marginal bone loss was detected between smoker and non‐smoker patients (p = 0.021). Implants with internal‐conical abutment connection showed stable peri‐implant bone levels at the medium‐term follow‐up. Nevertheless, further prospective long‐term clinical studies are necessary to confirm these data.

Original languageEnglish
Article number8709
Pages (from-to)1-10
Number of pages10
JournalApplied Sciences (Switzerland)
Issue number23
Publication statusPublished - Dec 1 2020
Externally publishedYes


  • Internal‐conical‐connection
  • Marginal bone level
  • Partial fixed dentures

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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