The position of internal bevel incision for gingivectomy surgeries is at
3mm coronal to mucogingival junction
3mm apical to mucogingival
At the mucogingival junction
1.5 mm apical to mucogingival junction
With a #15 Bard-Parker blade, the initial scalloped internal bevel incision is made at least 3 mm coronal to the mucogingival junction, including the creation of new interdental papillae.
The same blade is used to thin the gingival tissues in a buccolingual direction to the mucogingival junction. At this point the blade establishes contact with the alveolar bone, and a full-thickness or a split-thickness flap is elevated.