Final answer:
The correct technique for adapting the edges of an impression for a full denture in the mucobuccal fold is Border molding. This method considers the anatomical features of the jaw and teeth to ensure a good fit and comfort.
Step-by-step explanation:
The method used to achieve a closer adaptation of the edges of the impression of the tissues in the mucobuccal fold for a full denture is Border molding. Border molding is a technique used in prosthodontics to enhance the fitting of a denture by precisely shaping the borders of an impression material alongside the mucobuccal fold. This process takes into consideration the alveolar process of the mandible as well as the anatomy of a tooth, including the gingivae that line the alveolar processes and the periodontal ligament that holds the teeth in their sockets. Accurate border molding is essential to ensure that the full denture sits comfortably and securely within the patient's mouth.