Factors influencing hand steadiness were investigated in 66 subjects performing unrestricted linear arm movements. Results demonstrated that most hand tremor occurs in the up-down plane, with right-left and in-out tremor occurring less frequently. In addition, arm movements made by subjects viewing a target by means of a mirror were found to produce more errors than those made by direct viewing. Other literature is cited, and implications are discussed for the utility of a hand-steadiness procedure in dental practice.
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