*2.6. Evaluation of Peri-Implant Clinic-Radiographic Parameters*

As explained elsewhere [20], a trained investigator (F.A.V.) calculated and reported the peri-implant PD, BOP, PI, and CBL (distal and mesial) around every dental implant, as recommended by the specific guidelines declared in the consensus report of the Eleventh European Workshop on Periodontology [29]. To summarize, the peri-implant PD, BOP, and PI were calculated at 6 sites per implant, i.e., disto-palatal/-lingual, mid-palatal/-lingual, mesio-palatal/-lingual, distobuccal, mid-buccal, mesiobuccal. Utilizing a graded probe

(Hu-Friedy, Chicago, IL, USA), the measurement of peri-implant PD was carried out to the nearest mm. The digital bitewing radiographs, which were standardized utilizing long cone parallel methods, were employed to record the CBL [30]. The recording of the linear distance was performed 0.2 cm below the abutment–implant junction to the alveolar crest. The CBL was defined as the bone loss median measured on mesial and distal aspects of the dental implant.
