edentulous patients rehabilitated with fixed full-arch prosthesis on 4 implants

edentulous patients rehabilitated with fixed full-arch prosthesis on 6 implants

difference in marginal bone level from the functional loading time with the provisional prosthesis (baseline) to the end of the follow-up measured in millimeters/years on periapical radiographs. Periapical radiographs of each implant were taken every year using the parallel long-cone technique and a standardized film holder (Rinn Centratore XCP Evolution 2003, Dentsply, Rome, Italy).

included detachment/incisal and occlusal wear/fracture/chipping/replacing of denture teeth, fracture of implant, prosthesis or framework, loosening/fracture of abutment or occlusal screw, loosening/fracture of the prosthetic screw

inflammation / infection under fixed prosthesis, soft tissue hypertrophy / hyperplasia, soft tissue recession / dehiscence, peri-implant mucositis, peri-implantitis.

Modified plaque index (mPI), modified gingival index (mGI), bleeding on probing (BoP), and probing depth (PD). mPI, mGI, BoP, and PD measurements were performed at 6 aspects per implant. mPI was scored as: 0 = no detection of plaque; 1 = plaque only recognized by running a probe across the smooth marginal surface of the implant; 2 = plaque can be seen by the naked eye; 3 = abundance of soft matter. mGI was scored as: 0 = no bleeding when a periodontal probe is passed along the mucosal margin adjacent to the implant; 1 = isolated bleeding spots visible; 2 = blood forms a confluent red line on mucosal margin; 3 = heavy or profuse bleeding. BoP was scored as 0 = absence; 1 = presence; PD was measured in mm.