Method: A total of 20 patients who were referred for surgical crown lengthening were included. Gingival margin location relative to the CEJ was recorded on sound teeth mesial and distal to the tooth that required crown lengthening. A single calibrated examiner conducted all the examination using UNC-15 probe and a custom made stent. Data were analyzed using paired t-test, independent t-test and Pearson correlation.
Result: The mean age (± standard deviation) of the study sample was 25 (± 8) years. The mean values for GM-CEJ distance before (closed) and after (open) flap reflection, respectively were 1.32 (± 0.64) mm and 1.34 (± 0.62) mm. The difference between the open and closed measurements was not significantly different (p>0.05). The GM-CEJ distance was negatively associated with age (r=-0.44, p<0.001). Females had a significantly greater mean GM-CEJ distance than males (p<0.001).
Conclusion: Within the limitation of this study, no difference in the GM-CEJ distance measurements between open and closed method.