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(a) Page from laboratory manual used by periodontal investigators to measure gingivitis (MGI) and plaque index (PI). Page included instructions and scoring charts as shown. (b) Mean (1SD) marginal gingiva indices (MGI) for the Michigan group (filled) and SOVA group (unfilled) at baseline, after 1 week and 4 months with splints. Upper = upper arch; lower = lower arch. (c) Mean (1SD) plaque indices (PI); format similar to MGI plot
