Read a tooth's Mombelli modified Plaque Index grade on one surface from
the active chart. Grade 0 (default) means healthy/absent — never distinct
from "never charted". Implant-only in practice (see setter), but the
getter itself is unconditional (mirrors PI/GI/every other graded axis).
Read a tooth's Mombelli modified Plaque Index grade on one surface from the active chart. Grade 0 (default) means healthy/absent — never distinct from "never charted". Implant-only in practice (see setter), but the getter itself is unconditional (mirrors PI/GI/every other graded axis).