A cross-sectional study was carried out in 200 patients presenting 760 external-hexed cylindrical dental implant supported prosthesis with at least 1 year of loading time (range: 19 years). Probing depth, bleeding on probing and suppuration data was collected. Radiographs were required to evaluate supporting bone levels around implants.
Buttendorf AR, Ferreira CF, Oliveira de Souza JG, Dalago H, Bianchini MA (2014) Prevalence of Peri-implant Diseases â Part 1. Dentistry 4:238.