Abstract: Objective: To explore the workflow and clinical efficacy of fabricating duplicate dentures using digital prosthodontic technology. Methods: Using digital techniques, the model scanner was used to obtain the complete surface morphology information of the existing dentures. The generated STL file from this technique represented a digital duplicate of the scanned dentures. A wax-up duplicate denture was milled by five-axis CNC equipment. The occlusal relationship and fullness were re-determined after wax-up tried in. The initial models reproduced with silicone rubber and jaw relationship were transferred to the articulator. After wax teeth replaced with artificial teeth, the occlusal relationship was verified by dentist. After border molding, the wax-up was used to take close-mouth impression. The final models were poured using plater. The duplicate denture was completed after installing the plastic to the press box and heating. The patient’s satisfaction was measured using the visual analogue scale after denture delivery. Results: All restorations of ten patients were completed. The duplicate dentures with good retention and stability, and proper extension of the base edge got good aesthetics and high patients’ satisfaction. Occlusal balance was achieved by a bit of adjustment. Follow-up visit, the patients had no tenderness, and had good chewing function and good aesthetic effect. The visual analogue scale scores of the patients of digital duplicate dentures showed high satisfaction. The scores of the patients’ satisfaction of duplicate denture were higher than ninety-six in six aspects, including general satisfaction, easy cleaning, pronunciation ability, comfort, aesthetics and chewing function. Conclusions: The digital technology could be used to fabricate duplicate denture for edentulous patient who wore complete denture for a long time without discomfort to reduce clinical visits, simplify the clinical and technical procedures, and improve clinical outcomes and patient’s satisfaction.

Key words: complete denture, duplicate denture, computer aided design/computer aided manufacturing(CAD/CAM), computerized numerical control milling, digital