Abstract: Objective: To investigate the clinical workflow, technical characteristics, and short-term outcomes of single-retainer Maryland bridges fabricated from zirconia using liquid 3D printing advance customized jetting (ACJ) technology for the restoration of bilateral mandibular anterior tooth loss. Diagnosis and Treatment: A single adult female patient presenting with bilateral mandibular lateral incisor loss was selected. Digital intraoral scanning was performed to obtain three-dimensional data. Computer-aided design (CAD) software was used to design the single-retainer Maryland bridge, which was then fabricated from zirconia using ACJ technology combined with high-temperature sintering. During the clinical procedure, a Tooth Preparation Dynamic Monitoring (TP-DDM) system was employed for minimally invasive tooth preparation, and a universal resin bonding system was used for cementation. Results: Immediate and short-term follow-up evaluations revealed that the ACJ zirconia Maryland bridge seated smoothly with excellent marginal adaptation and stable retention. The aesthetic morphology harmonized well with the adjacent teeth, periodontal tissues remained healthy without inflammation, and the patient reported high subjective satisfaction. Conclusions: The zirconia single-retainer Maryland bridge fabricated via ACJ technology, combined with digital minimally invasive preparation, achieves the restorative goals of high precision, high strength, and minimal invasiveness. It provides an effective fixed restorative option for anterior small-span edentulous cases unsuitable for implant therapy, though its long-term efficacy requires further observation.

Key words: liquid 3D printing, advance customized jetting, zirconia, Maryland bridge, dentition defect