Vertical releasing incisions are indicated in all of the following, except?

Vertical releasing incisions are primarily used to ensure that flaps can be adequately mobilized during dental procedures, particularly those involving periodontal surgery. The goal of these incisions is to create a flap that is both functional and effective in terms of exposure and access to underlying tissues.

The indication that pertains to avoiding a short flap (mesial distally) while promoting a long apical-gingival flap directly addresses the mechanics of flap design and mobilization. A short flap may not provide sufficient access or visibility for the surgical procedure at hand, and it could lead to complications such as inadequate healing or tissue necrosis.

When vertical releasing incisions are designed, they should effectively allow for proper positioning of the flap so that it can be either repositioned or sutured appropriately without tension. This is why a design that emphasizes an adequate length is crucial, and a long apical-gingival flap is preferred for coverage and stability.

Therefore, the correct answer is supported by the principle that vertical releasing incisions serve the purpose of allowing for adequate flap mobility and function; however, it is not appropriate to indicate them solely to avoid short flaps, since this does not encompass the broader functional needs of surgical access and healing after periodontal or other dental procedures.