R elining a deficient or otherwise defective impression after it has been completely relieved and vented is a commonly accepted procedure. Several studies have documented this technique and the resultant accuracy of the relined impressions.1-4 A similar technique is the widely used and accepted putty/wash impression system.i-6 However, the accuracy of correcting slightly defective or deficient impressions by venting, selectively adding a small amount of correcting impression material to the defective or deficient part, and reseating the impression has not been reported. If such a technique demonstrated consistently accurate results, the conservation of time and the economy of the use of minimal material would be beneficial to the dentist. This investigation was conducted to determine if acceptable results could be obtained with the use of a selective correction technique for slightly defective impressions.