subgingival instrumentation

sub·gin·gi·val in·stru·men·ta·tion

(sŭb-jinji-văl instrŭ-mĕn-tāshŭn)
Use of an instrument apical to (below) the gingival margin.
References in periodicals archive ?
Subgingival Instrumentation 4 mm--Gingival Attachment Level