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In Vitro Comparison of Microbial Leakage of the Implant-Healing Abutment Interface in Four Connection Systems
EAO Online Library. Shidfar S. Oct 9, 2018; 232554
Shireen Shidfar
Shireen Shidfar
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Considering the increasing demand and popularity of one-stage implant placement and consequently longer retain of healing abutments in the oral cavity, microleakage through the implant-healing abutment interface would be an interesting research topic. Microgap at the implant-abutment interface can serve as a suitable area for accumulation and proliferation of bacteria, And can result in halitosis and peri-implant diseases such as peri-implant mucositis and peri-implantitis.This study sought to assess microbial leakage through the implant-healing abutment interface in four dental implant connection systems.Ten implants of each of the 3i (double hexagon + flat to flat+ group 1), IDI (Internal hexagon + Morse taper+ group 2), Swiss Plus (external bevel + internal octagon+ group 3) and Tapered Screw-Vent (internal bevel + internal hexagon+ group 4) systems were used in this in vitro, experimental study. Healing abutments were screwed to the implants with 10N cm torque. Implants were immersed in Escherichia coli suspension for 24 hours. Healing abutments were then removed and samples were taken of the internal surface of implants and cultured. Number of grown colonies was counted after 24 hours of culture. The same procedure was repeated after seven and 14 days of immersion in microbial suspension. The same was repeated with healing abutments torqued to 10 and 20 Ncm. With 10 Ncm torque, all specimens in all groups showed microleakage at one day with the highest microleakage in one sample in group 3. At seven days, the highest microleakage was noted in one specimen in group 2. With 20 Ncm torque, group 3 showed significantly higher microleakage than other groups at one and seven days (P<0.05). Group 4 ranked second in terms of microleakage. Increasing the torque decreased microleakage in all groups except for group 3. Microbial leakage occurred in almost all implant systems in our study. In one-stage implant placement, healing abutments should be preferably torqued to 20N cm to minimize microleakage. Optimal tourque for healing abutment insertion should be analyzed individualy for each system.
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