1. A condensing instrument used to aid the process of joining or packing a material e.g. gold foil restorations.
2. A rotary instrument used to condense a gutta-percha cone or introduce calcium hydroxide into a root canal. The McSpadden compactor®, introduced by John McSpadden in 1978, has the design of an inverted Hedstrom file, that is, with the blades turned towards the tip instead of towards the shaft; it softens the gutta-percha, forcing it ahead of and lateral to the compactor shaft.
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