ID,CEJ,Cement-enamel-junction position definitions, Jones and Sadler
1,"q","The CEJ is below the alveolar border buccally and lingually (cheek and tongue side), and see Note 1."
2,"x","The CEJ is level or within 1mm at any point of the alveolar border buccally or lingually, for any of the tooth elements (pillars); and see Note 1."
3,"y","The CEJ is above the alveolar border, buccally or lingually; and the root arch is still below; and see Note 1."
4,"z","The root arch is visible above the alveolar border, lingually and/or buccally."
5,"n","no data (e.g., CEJ not formed yet; area of jaw missing; used as a placeholder)"
6,"Note 1","The appearance of the CEJ on the mesial or distal edges of the tooth, where it rises steeply, is disregarded (see Jones 2007, Fig. 249)."
7,"Note 2","Care needs to be taken to distinguish the CEJ from cementum and calculus deposits."
8,"Note 3","Examine both sides of the jaw.  x and y is often reached first on the buccal side."
9,"Note 4","z  occurs earlier and much more clearly on the lingual, than the buccal side."