A 48-year-old man complains of a burning sensation in his mouth that occurs. when he wears a removable partial laminar denture for the lower jaw that was made for him 2 weeks ago Objectively, he has hypersalivation, his oral mucosa is hyperemic and edematous. Previously, the patient had been using a removable partial laminar denture, made for him 4 years ago, and he had no such complaints. What is the most likely cause of the complication in this case?