Table 4.

Diagnosis of the peri-implant mucositis in the included studies. MB: Marginal bleeding: presence (score 1) or absence (score 0) of bleeding obtained by running a probe along the soft tissue margin without probe penetration inside the sulcus or pocket. Dichotomous: presence(1)/absence(0). (2) Absence of bone loss during the last 2 years before baseline of the study. (1) Peri-apical intraoral radiographs were obtained for each implant baseline using the paralleling technique and a radiographic positioner. The radiographs were analyzed for peri-implant bone loss by the same examiner (PMD) using abutments and the threads of the implants as reference points.

Study	Bleeding on probing	Marginal bleeding	Gingival index	Periodontal probing depth	Suppuration	Bone loss
Heitz-Mayfield et al., 2011	Dichotomous					absence
Thöne-Mühling M et al., 2010	Dichotomous at least at one site		GI≥ 1 at least at one site at baseline			absence2
Ramberg P. et al., 2009	Dichotomous			PPD≥4mm		absence
Màximo MB et al., 2009	Dichotomous	Dichotomous			absence	absence
Duarte PM et al., 2009	Bop: 15 seconds after gentle probing (Dichotomous)	Dichotomous			absence	absence1