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ditch (ditching),

n the undesirable loss of tooth substance in the region of a restoration margin (usually gingival).
References in periodicals archive ?
Thirteen people were killed in August 1981 when a Wessex helicopter ditched in the North Sea off Norfolk.
The CHC helicopter was carrying an oil-change crew from Aberdeen to a rig 86 miles north-west of Shetland when it ditched around 3.
Summary: A helicopter carrying 14 people has ditched in the North Sea.
A British pilot feared dead has been hailed a hero by his employers after he ditched his plane in the south Caribbean sea.