Dental implant placement and implant-supported restorations have become a vital element of modern restorative dentistry. Intense research and continual improvement of materials and clinical protocol lead to a remarkable 10-year survival rate of about 98.8% in titanium implants today. However, the clinical success of implant-supported restorations not only depends on the implant survival rate, but also on the absence of technical prosthetic and biological complications during the implant loading time. In this aspect of treatment, considerably lower success rates can be observed. Since the true clinical relevance of keratinized gingiva around dental implants is still under controversial discussion, the subject of stable peri-implant soft tissue should be a main focus of clinical research.

There have been several studies on the cause of biological complications. An important point to consider is the quantity and quality of the peri-implant soft tissue and its effect on peri-implant tissue health over time....

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