<prompt> A 60 year old male patient complains of food lodgment in upper right back teeth region. Patient gives ho RCT with 16 and 17. Crown cutting was done with 16 and 17 and impression was taken with type V gypsum product. The setting expansion of this gypsum material is-0.100.150.300.20  <response>: The setting expansion has been increased from a maximum of 0.10 to 0.30. The rationale for increasing setting expansion is that certain newer alloys, such as base metal, have a greater casting shrinkage than do the traditional noble metal alloys. Thus, higher expansion is required in the stone die to aid in compensating for the alloy solidification shrinkage. 