MASTER CASTS
Grade A	Base of cast parallel to ridges (mean foundation plane). Cast is 11-13 mm thick in the thinnest areas. Land areas clearly present, are contoured to follow depth of vestibules, beveled at a 30-45 degree angle. and are not more than 2 mm above the depth of the vestibules. Land areas are 3-4 mm wide. Land is 4-6 mm wide on the posterior of the mandibular cast. Vestibules present and 1-3 mm deep. All areas of denture support present in cast with no obvious over or under extensions. Repositioning indexes present and approximately 10 mm wide and 3-5 mm deep. tongue area flat and smooth and no more than 3 mm above depth of vestibules. Casts neat and clean with no voids or blebs and non-tissue surfaces smoothed.
Grade B	Minor discrepancies from Grade A which will not compromise the quality of the denture.
Grade C	Master cast is adequate to make a clinically acceptable complete denture, but marginally so. Cast thickness beyond criteria above, less than 11 mm thick. Land area not smooth, doesn't follow vestibule, and/or had insufficient width. Vestibule present, but insufficient depth causes a future loss of contour to denture flange. Repositioning indices present, but too deep or shallow. Cast not neat, smooth, and clean. Wax remains in undercuts on cast.
Grade E	Master cast prevents clinically acceptable complete denture treatment. master cast is broken and/or glued in place.