Journal of Dental Implants
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Year : 2011  |  Volume : 1  |  Issue : 2  |  Page : 51-57

Evaluation of the bacterial leakage along the implant-abutment interface

1 Department of Dental Materials and Prosthodontics, São Paulo State University-UNESP, São Paulo, Brazil
2 Department of Dentistry, Federal University of Santa Catarina, Florianópolis, Brazil

Correspondence Address:
Renata Faria
Av. Conselheiro Nebias, 628/Cj 35, Santos, São Paulo, CEP: 11045-002
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0974-6781.91280

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Context : Recent studies observed contamination of the inner parts of dental implants through bacterial penetration along the implant-abutment interface that may cause malodor and inflammation of peri-implant tissues. Aims : Evaluate in vitro bacterial leakage along the implant-abutment interface, comparing three types of connections : EH, IH and MT. Materials and Methods : Under sterile conditions, a colony of E. coli was inoculated in the apical portion of abutment screws, which were fixed to implants with a torque of 20 Ncm. Samples with immediate external contamination were discarded, while remaining specimens were placed in test tubes containing TSB. The broths that showed turbidity within the seven-day study period were planted in Petri dishes with TSA, and incubated in a bacteriological stove at 37°C for 24 h. At the end of the evaluation period, all assemblies were separated, and the internal content was collected using absorbent paper cones and saline water, and again planted to assess bacterial viability. The samples that did not contain viable E. coli were dismissed from the final results. As a result, 38 samples with EH, 40 with IH and 41 with MT connections were evaluated. Statistical Analysis Used : Survival curves were analysed using the Kaplan-Meyer test and compared by log-rank statistics. Results : There were no differences between the EH (10.53%), IH (4.88%) and MT (7.50%) connections. Conclusions : Bacterial infiltration occurred similarly in all three types of connections between abutments and implants, despite the different configurations of the interface.

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