Study of the accuracy of different recording materials.

An experimental study was conducted to determine the three-dimensional errors in mounting casts affected by the interocclusal recording materials. Eight commonly used materials or combinations were tested after various storage periods. The results indicated that all the materials induced asymmetric deviations of the condyles after each storage period. Impression plaster was the most accurate and dimensionally stable material; polyether was the second most accurate material, but it must be used within 6 hours. Correction of the teeth imprints with a low-viscosity material was beneficial only in combination with wax wafers.