Predictive Value of Reduced Keratinized Mucosa on the Secondary Prevention of Peri-implant Mucositis and Periimplantitis in Patients Attending Regular Supportive Peri-implant Care. A Longitudinal Analysis

* Capture of the potential risk factor "lack of band of keratinised mucosa" over a period of up to 5 years. * Recording of peri-implant inflammatory processes in study participants that are not recorded during normal tooth cleaning * Registration of the extent of radiographic bone loss. Bone resorption through analysis of existing X-ray images * Individual therapy recommendation/individual supportive peri-implant care in case of peri-implant inflammation * The present study was specifically designed to investigate the effect of reduced width of keratinized mucosa (KM) on the secondary prevention of peri-implant mucositis and peri-implantitis in patients attending a supportive peri-implant care program (SPIC) over an observation period of up to five years.