Association of the presence and amount of periodontopathogens and GCF IL-1β levels with GO status. * denotes p< 0.05 by Mann-Whitney U test or independent t test. IL-1β, interleukin-1β; GO, gingival overgrowth; Pg, Porphyromonas gingivalis; Aa, Aggregatibacter actinomycetemcomitans; Pi, Prevotella intermedia; Td, Treponema denticola; Tf, Tannerella forsythia;