A = the vertical dimension (H) of the EJS is determined by the distance between the alveolar ridge crest and maxillary sinus.
B = the vertical dimension (H) of the EJS is determined by the distance between the alveolar ridge crest and mandibular canal.
C = the vertical dimension (H) of the planned implant is determined by the distance between the alveolar crestal ridge and mental foramen.
The horizontal EJS dimensions: length (L) in all cases is determined by the distance between neighbouring teeth or implants and width (W) is determined by the alveolar process width measured at the level of 3 mm (W1) and 6 mm (W2) from the crest of alveolar process.