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POSTERIOR PALATAL SEAL ON MASTER CAST |
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| Grade A | Outline of posterior palatal seal neatly carved to correct position and size. Extends about 3 mm lateral to pterygomaxillary notches. Narrows in midline area. On average 2-3 mm in width in midline, 2 mm in width at pterygomaxillary notches and 4-6 mm wide in between. Depth of seal is in the range of 1.0-1.5 mm deep except in the pterygomaxillary notch area where depth is slightly less. |
| Grade B | Minor discrepancies from above which do not compromise the quality of the clinical treatment. Outline of posterior palatal seal neatly carved, and correctly positioned. Size and/or shape slightly out of norm. Slightly rough or irregular. |
| Grade C | Posterior palatal seal carved in master cast is adequate to make a clinically acceptable complete denture, but marginally so. Indelible marker ink spread out making markings somewhat indistinct. Standard shape of "ideal" posterior palatal seal present. Depth deviates significantly from above. |
| Grade E | Posterior palatal seal prevents clinically acceptable complete denture treatment. Posterior palatal seal absent or is grossly indistinct, ill-shaped or sized. Excessive or inadequate depth into master cast. Does not extend into buccal vestibule. located much too far posteriorly or anteriorly relative to the structures used for reference. |