Evaluation of the Human Subject's Ability to Differentiate Intensity of Forces Applied to the Maxillary Central Incisors

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Abstract
Minimal detectable differences between two centered forces applied to maxillary central incisors were determined for 50 subjects. The forces involved were 10, 50, 100, 200, 500, and 1,000 gm; most accurate subjective discrimination was between the 50- and 500-gm centered forces. Incisally and labially directed forces yielded nearly identical results.