Table 3.

Detection frequencies of target bacteria in subgingival peri-implant sites for each group

	T. forsythia (Tf)	P. gingivalis (Pg)	T. denticola (Td)	TBL	Tf + Pg	Tf + Td	Pg + Td	Red complex
Healthy	12 (22.2%)	6 (11.1%)	9 (16.7%)	52 (96.3%)	6 (11.1%)	6 (11.1%)	6 (11.1%)	6 (11.1%)
Peri-implantitis	8 (33.3%)	9 (37.5%)	8 (33.3%)	24 (100%)	6 (25%)	6 (25%)	8 (33%)	6 (25%)
Differences per group	n.s.	**	n.s.	n.s.	n.s.	n.s.	*	n.s.

Chi-squared test for evaluating differences in bacterial presence between groups.

n.s. = nonsignificant.

*p < 0.05; **p < 0.01.

Tf: Tannerella forsythia (T. forsythia); Pg: Porphyromonas gingivalis (P. gingivalis); Td: Treponema denticola (T. denticola).

Red Complex = Tf + Pg + Td.

TBL = Total Bacterial Load.