Figure 1.

Illustrating nine different sites of measurement. 1 – Pulp floor 2 – Coronal buccal wall, 3 – Coronal lingual wall, 4 – CEJ of buccal wall, 5 – CEJ of lingual wall, 6 – Radicular buccal wall which is equidistant from both CEJ and apex 7 – Radicular lingual wall which is also equidistant from both CEJ and apex, 8 – Apical area on the buccal wall, 9 – Apical area on the lingual wall