Methods: The distance from the base of the normal contact to the CEJ was measured using a digital micrometer on 186 sites in 6 skulls.
Results: The mean distance from the base of the normal interproximal contact to the CEJ on all teeth, except maxillary incisors, was 3.06 mm with a SD of ±0.81. The corresponding distance on the maxillary incisors was 4.03 mm with a SD of ±0.87 and the difference between maxillary centrals and the rest of the teeth was significant (P<0 .0001).
Conclusion: The distance from the base of the normal contact to the CEJ is 3 mm for teeth other than maxillary incisors and 4 mm for maxillary incisors. This was a consistent finding. This leads to the possibility that this may prove to be a repeatable, reliable, and alternative means of relating the gingival margin to the CEJ which does not depend on the tactile sensitivity needed to locate a subgingival landmark or one that is potentially obscured by a restoration or calculus.
Keywords: Anatomy, Diagnosis, Periodontics, Teaching and Teeth
See more of: Periodontal Research - Diagnosis / Epidemiology