*2.6.7 Margin placement guidelines*

Rule-1: If the sulcus probes 1.5 mm or less, place to restoration margin 0.5 mm below the gingival tissue crest.

Rule 2: If the sulcus probes more than 1.5 mm, place the margin one half the depth of the sulcus below the tissue crest.

Rule-3: If the sulcus probes >2 mm especially on the facial aspect of the tooth, then evaluate to see whether gingivectomy could be performed to lengthen the crown and create a 1.5 mm sulcus. Then patient can be treated as mentioned in Rule-1 [51].
