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deflection. n. 1. the act of deflecting or the state of being deflected. 2. the amount of deviation. 3. (General Physics) the change in direction of a light beam as it crosses a boundary between two media with different refractive indexes.
retraction, n 1. a drawing or shrinking back; the laying back of tissues to expose a given part. n 2. distal movement of teeth; a distal or retrusive position of the teeth, dental arch, or jaw. retraction, gingival, n laying back of the free gingival tissue to expose the gingival margin area of a preparation by mechanical, chemical, or electrical means.