ditch

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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 ?
Hedgers and ditchers were valued in the society in which I grew up (West Wales).
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The hours of attendance were from seven in the morning to five in the afternoon, with two hours' break for the early Elizabethan dinner: time enough to wander in the gangling timber streets, hazardous though they were with traffic, conflagrations and the out-pourings of the ale houses, descended from the tavern-haunters of Piers Plowman: scavengers, rat-catchers, ditchers, horse-dealers, fiddlers, rope-makers, old-clothes sellers, needle-vendors, tinkers' apprentices, pedlars and other drinkers of beer by the gallon.