Retrospective Clinical Study of a Freely Removable Implant-Supported Fixed Dental Prosthesis by a Microlocking System

Table 6

Modified plaque index (mPI) and modified sulcus bleeding index (mBI).

	Score	Occurrence rate (%)			value
		6-12 months	12-18 months	18-24 months
mPI	0	83.3	85.7	100.0	0.78
	1	13.9	14.3	—
	2	2.7	—	—
	3	—	—	—
mBI	0	72.2	81	100.0	0.60
	1	16.7	14.3	—
	2	11.1	4.8	—
	3	—	—	—

mPI = modified plaque index; score 0: no detection of plaque; score 1: plaque only recognized by running a probe across the smooth marginal surface of the implant; score 2: plaque can be seen by the naked eye; score 3: abundance of soft matter. mBI = modified sulcus bleeding index; score 0: no bleeding when a periodontal probe is passed along the gingival margin adjacent to the implant; score 1: isolated bleeding spots visible; score 2: blood forms a confluent red line on the margin; score 3: heavy or profuse bleeding.