What is the correct incision design for a mini-flap to restore root surface caries?

The correct choice for the incision design for a mini-flap aimed at restoring root surface caries is the one where incisions are made at the line angles, initially toward the papilla and then apically. This approach is considered optimal because it helps in minimizing tissue trauma while effectively providing access to the area requiring treatment. By directing the incisions toward the papilla, you maintain better blood supply to the tissue, preserving the integrity of the periodontal structures surrounding the tooth and facilitating quicker healing.

This incision technique also allows for a controlled flap reflection, making it easier to manage soft tissue without compromising the remaining papillary tissue. It ensures adequate access to the root surfaces for caries removal and subsequent restoration while allowing for the flap to be repositioned comfortably at the end of the procedure.

In comparison, other designs may not provide the same level of tissue preservation or access. For example, vertical incisions that bisect the papilla might disrupt the blood supply more significantly and potentially lead to complications like necrosis of the papilla. An envelope flap that incorporates teeth on either side could unnecessarily mobilize more tissue than needed and may add complexity to postoperative healing. Likewise, incisions made strictly at the line angles and straight apically might limit visualization and access needed