This woman is having some sort of dental procedure done.
The woman needed no dental work.
One woman needs no dental work; the other woman is having a dental procedure.
exists e2 e1 s1 x1 x2 x3 x4.(n_woman(x1) & Theme(e2,x2) & Actor(e2,x1) & v_have(e2) & Theme(e1,x4) & v_do(e1) & (x2 = x4) & of(x2,x3) & n_procedure(x3) & a_dental(s1) & Theme(s1,x3) & n_sort(x2))
exists x1.(n_woman(x1) & -exists e1 s1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_need(e1) & n_work(x2) & a_dental(s1) & Theme(s1,x2)))