Association Between Local Factors and Implant‐Related Complications: A Population‐Sampled Cross‐Sectional Analysis

Aim To investigate the role of local factors and the association with peri‐implantitis and peri‐implant soft‐tissue dehiscence (PISTD). Materials and Methods A randomly selected sample of Norwegian patients who underwent implant therapy in 2014 was examined (242 patients; 732 implants). Clinical and radiographic parameters were recorded, including soft‐tissue phenotype, mucosal margin mobility, connection type, platform switching, emergence angle, implant location and presence of adjacent teeth. To account for clustering of implants within patients, mixed‐effects logistic regression models were applied. Results Mucosal margin mobility, bone‐level implants without platform switching, emergence angle > 45°, anterior implant location and daily smoking were identified as significant risk indicators for peri‐implantitis. Thin soft‐tissue phenotype, mucosal margin mobility, absence of adjacent teeth, peri‐implantitis and external connection were detected as significant indicators for PISTD. Peri‐implantitis and PISTD were present in 8.7% and 25.0% of implants, respectively. Conclusions Local factors and soft‐tissue‐related parameters, many modifiable during treatment planning, were associated with peri‐implantitis and PISTD. Particular attention should be given to soft‐tissue phenotype, connection design, platform switching and prosthetic emergence angle. The relationship between systemic and local risk factors should be further investigated.