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Sixty-two vinyl polysiloxane casts from subjects in the lying, supine position were measured for surface area with five shapes: conical, parallel sides, heart, slug, and pumpkin seed being included. The surface areas ranged from 65.73 to 107.07 cm(2) with a mean of 87.46 cm(2) and a standard deviation of 7.80 cm(2). There were no significant differences in surface area among the shape groups. And no correlations with surface area were found by parity or by rod length, introital diameter, posterior length of casts as measured with string, or greatest width and greatest depth of casts. 70% of the casts had a surface area of 84.50 cm(2) or above, and 90% had a surface area of 77.72 cm(2) or above. Variation within the interquartile range (75th to 25th percentile) was +/-5.2% of the median., (Copyright 2003 S. Karger AG, Basel)