Bacterial colonization of the internal part of two-stage implants. An in vivo study

Clin Oral Implants Res. 1993 Sep;4(3):158-61. doi: 10.1034/j.1600-0501.1993.040307.x.


This study aimed to investigate the presence of microorganisms in the inner thread of the fixture (endosteal implant part) of the Brånemark system. In 9 volunteers the apical part of 2 abutment screws that had been in place for 3 months was examined by means of differential phase-contrast microscopy. All screws harboured a significant quantity of microorganisms, mainly coccoid cells (86.2%) and nonmotile rods (12.3%). Motile organisms (1.3%) or spirochetes (0.1%) were only sporadically registered. A microbial leakage at the abutment/fixture interface probably is the most probable origin for this contamination.

MeSH terms

  • Bacteria / isolation & purification
  • Colony Count, Microbial
  • Dental Implants*
  • Dental Leakage / complications*
  • Equipment Contamination*
  • Humans
  • Microscopy, Phase-Contrast
  • Prosthesis-Related Infections / microbiology*


  • Dental Implants