2. Peri-implant pocket depth
A graduated probe was used to measure the distance between the base of the pocket and the gingival margin. The probe was introduced until its blunt edge made contact with the base of the pocket in a straight line with the implant's vertical axis. Around each implant, the pocket depth was measured at 4 different sites (mesial, buccal, distal and palatal). Measurements were taken and recorded to the nearest 0.5 mm.