Revisiting impressions using dual-arch trays.

The article provides a literature survey of methods used for taking dental impressions in the clinical setting. These studies report on several aspects including metal, plastic, dual-arch and full-arch trays. The survey results show that the use of dual-arch metal trays is advisable. The various factors to be considered while taking impressions have been discussed including the size of the impression syringe and the necessity of a dry field.