Association Between Restorative Emergence Profiles and Peri-implant Bone Loss in Different Implant Systems:

Inclusion Criteria: * Patients who have undergone the initial phase followed by implant placement. * Implants placed and prosthesis delivered for more than 3 years. * Implants placed in premolar/molar region * No reconstructive bone procedure done on the site of study * Presence of opposing occlusion * Non-smokers Exclusion Criteria: * Systemic diseases (uncontrolled diabetes, drugs that can affect bone metabolism). * Total edentulousness. * Inappropriate, unavailable, or distorted x-rays. * Implants placed at a supra or infra bone level. * Implants placed immediately after an extraction. * Poor oral hygiene (High plaque score FMPS control record \> 30%) * Smokers * Signs of peri-implantitis development during the first year following functional loading * Lack or incomplete information regarding peri-implant conditions (clinical and radiographic documentation at the required study time-points) * Surgical treatment on the study implants during the first 2 years after peri-implantitis diagnosis