IL: Interleukin; TNF: tumor necrosis factor; TGF: transforming growth factor; MMP: metalloproteinase; RANK: Receptor activator of nuclear factor kappa; OPG: Osteoprotegerin; n: individuals; MP: peri-implant mucositis; PI: peri-implantitis; SD standard deviation. The gene discussed is TNF; the disease is Peri-Implantitis.