Answer: (d)
When carious lesion extends gingivally enough that a soft tissue flap is necessary for adequate access and visibility. Proper surgical procedures must be followed including sterile technique, careful soft tissue management and complete debridement of the operating site prior to wound closure. When the gingival margin of the restoration violates the biologic width (Gingival margin of the restoration is less than 3mm from the crest of the bone) osseous crown lengthening may be necessary.
The design of the “mini-flap” is: intersulcular incision around the tooth (or the surface that you need access for restoration), full-thickness flap with small vertical releasing incisions not extending beyond the mucogingival junction. Flap is repositioned at the previous coronal height (note: not apically positioned) and suture may be necessary.
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