Wash Material Displaced 

Insufficient amount of wash material applied. +

Use wash material liberally on preparation and abutments.

Contrast in viscosity between tray and wash material too high. +

Avoid high viscosity contrast between tray and wash material. Especially, when using putty materials combine them with a high viscosity wash material. In general, follow manufacturers’ recommendations for material combinations.

Working time of tray material exceeded, viscosity already impaired. +

Select material with sufficient working time and pay attention to storage temperature. Working times are reduced due to higher temperatures of the product, while intra-oral setting times might be longer if the temperature of the product is lower.