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a rest consisting of closely interlocking parts.
Etymology: L, praecidere, to cut short; AS, rest
a rigid denture support consisting of two tightly fitting parts, the insert of which rests firmly against the gingival part of the device.
pre·ci·sion rest(prē-sizhŭn rest)
Rigid metallic extension (patrix) of closely interlocking parts in a fixed or removable prosthesis that fits precisely into a receptacle (matrix) of a precision attachment within a restoration.