1. Department of Periodontology and Synoptic Dentistry, Charité Universit?tsmedizin Berlin, Berlin, Germany;2. Department of Operative and Preventive Dentistry, Charité Universit?tsmedizin Berlin, Berlin, Germany;3. Department of Oral and Maxillofacial Surgery/Clinical Navigation, Charité Universit?tsmedizin Berlin, Berlin, Germany;4. Department of Oral Medicine, Dental Radiology and Oral Surgery, Charité Universit?tsmedizin Berlin, Berlin, Germany;5. +49 450 562 692+49 450 562 905
Abstract:
Surface decontamination remains challenging in peri‐implant infection therapy. To investigate the bactericidal efficacy of tissue tolerable plasma, S. mitis biofilms were created in vitro on 32 microrough titanium dental implants. Biofilm imaging was performed by confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). The implants were either rinsed with 1% NaCl as negative control (C) or irradiated with a diode laser (DL) for 60 sec as positive control or plasma (TTP60, TTP120) for 60 or 120 sec. Subsequently, colony forming units (CFU) were counted. Post‐treatment, implants were further examined using fluorescence microscopy (FM). Median CFU counts differed significantly between TTP60, TTP120 and C (2.19 and 2.2 vs. 3.29 log CFU/ml; p = 0.012 and 0.024). No significant difference was found between TTP60 and TTP120 (p = 0.958). Logarithmic reduction factors were (TTP60) 2.21, (TTP120) 1.93 and (DL) 0.59. Prior to treatment, CLSM and SEM detected adhering bacteria. Post‐treatment FM recorded that the number of dead cells was higher using TTP compared to DL and C. In view of TTP's effectiveness, regardless of resistance patterns and absence of surface alteration, its use in peri‐implant infection therapy is promising. The results encourage conducting clinical studies to investigate its impact on relevant parameters.
