Fig. 4

Schematic measurement principles. h is the height measurement, the distance between the palatal pit end (reference point O) and the buccal top of the outer cortical bone. l is the bone ridge width, measured on a bucco-lingual line crossing the alveolar socket, perpendicular to the palatal pit axis and at a distance of 6 mm or two thirds of the socket depth (depending on the patient’s bone morphology) from the reference point O