Diederik Hentenaar

95 Erythritol air-polishing in surgical peri-implantitis treatment 5 the presence of Aggregatibacter actinomycetemcomitans ( Aa ), Porphyromonas gingivalis (Pg ), Prevotella intermedia (Pi) , Tannerella forsythia (Tf) , Fusobacterium nucleatum (Fn) , Parvimonas micra (Pm) , Treponema denticola (Td) , and Filifactor alocis (Fa) before non-surgical intervention (Tpre), 3 months after the non-surgical intervention/before the surgical intervention (Tpost/ T0) and 12 months after the surgical intervention (T12) Figure 2. Percentage of patients (%) with positive peri-implant samples in test and control group for the presence of Aggregatibacter actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg), Prevotella intermedia (Pi), Tannerella forsythia (Tf ), Fusobacterium nucleatum (Fn), Parvimonas micra (Pm), Treponema denticola (Td), and Filifactor alocis (Fa) before non-surgical intervention (Tpre), 3 months after the non-surgical intervention/before the surgical intervention (Tpost/ T0) and 12 months after the surgical intervention (T12) Microbiological outcome Samples of forty-four patients were available for analysis at 12 months after treatment (21 test group, 23 control group). No significant differences between both groups for mean peri-implant log-transformed bacterial counts were found for any of the bacterial marker species at 12 month evaluation (Mann-Whitney U test p > 0.05) (see figure 2). Within group analysis revealed no significant changes after therapy (Wilcoxon test p > 0.05). The majority of samples from the natural dentition showed no difference in mean counts 12 months after therapy in both groups (see figure 3). However, a significant difference in levels of Pi , Td and Fa was seen for the control group. 4