IL1B and Peri-Implantitis: However, we did observe a risk association between the presence of the C/C genotype of the SNP IL-1β (− 511) and peri-implantitis (T/C vs T/T: I2 = 0%, p = 0.921; OR: 0.902; IC 95% 0.510–1.595 and C/C vs T/T: I2 = 0%, p = 0.555; OR: 2.255; IC 95%: 1.040–4.889) (Fig. 4).