It is reported antecdotally, that articaine (septocaine) causes gingival necrosis. Especially in the palate. I searched PubMed and the Journal of Endodontics for information. Currently, there are no published articles or case reports verifying that articaine causes gingival necrosis.
This is where I always advise colleagues to do what is comfortable and what works in their office. If a patient returns after treatment with sloughing of the palatal or lingual gingiva: 1) Reassure the patient. 2) Prescribe Peridex. Have the patient rinse twice a day for 1 week. 3) Pain medication may be warranted depending on the degree of discomfort.