I think what we need to take away from the Massad technique is use of trays specifically designed for the edentulous arch. Preliminary impressions worked well when we were using rubber base and custom trays but today PVS is a much more stable and accurate impression material and with the stock edentulous trays there is no need to fabricate custom trays. The Massad trays from Caulk are very nice and reasonably priced so they can be modified intraorally to get a custom fit. I do not go to the same extent as Massad does with multiple impression visocities but do use a putty to border mold then wash it with a medium body. if you want more predictable removable prosthetics I would suggest having the lab fabricate Eclipse baseplates and return them with wax rims. These baseplates become part of the final denture and have better fit then heat processed acrylic (ie Lucitone) which has a shrinkage of 7% whereas Eclipse has a 3% shrinkage. Also your able to judge the retention and fit at the records appointment when taking the bite with the rims. How it fits then is how the final will fit. But it all starts with an accurate impression capturng all the necessary landmarks.