If the tongue is cramped by the denture, lateral pressure will be exerted producing instability when the tongue moves

An old patient had a complete denture, he came to you after delivery complaining that the lower denture moves from the ridge when he just moves his tongue, you put a (pip) paste and checked the denture and there is no any areas of pressure or over extension, what is the problem?

A. Under extension of borders

b. Over extension of borders

c. High occlusal plane

d. Cramped tongue ***

If the tongue is cramped by the denture, lateral pressure will be exerted producing instability when the tongue moves.