2.  Using .06" thick plastic sheeting for vacuum forming,  make a "suck-down" of the entire 
     model (referred to here as a "stent"). 

3.  Using orthodontic acrylic in a damp, doughy stage,  form a DE on the warm stent that will oppose
     the midline of the mandibular incisors. 

4.  When cutting away the stent from the model, follow the borders of the denture and do not remove
      the palate portion.  The result will look like a clear, thin, full upper denture with a DE on it.

5.  Snap the stent over the patient's denture and instruct them to wear it during sleep (along with 
     their opposing denture if applicable).

     Typically, the patient's appearance may improve with the device in place, suggesting that the vertical dimension of occlusion of the denture was inadequate.  The intensity of their clenching was most likely not the cause of their symptoms (full denture wearers can't generate the kind of intensity that someone with a full dentition can), but was caused/triggered/enhanced by the the over-closed rotation of their condyles during their clenching activity (it would not be unusual for a full-denture patient who clenches to complain of joint pain, whereas a primary clencher (who doesn't clench excursively) with a full dentition rarely complains of joint pain).