What are the 3 possible arrangements of the CEJ?

See picture answer Three possible arrangements of enamel and cementum (commonly abbreviated to OMG): Overlap- Cememntum overlaps the enamel for a short distance Meet- Cememntum meets the enamel Gap- There is a small gap between the cementum and enamel, exposing the dentine in this area (patient may have dentinal sensitivity/pain)