###### Abstract  
This study investigated the feasibility and effectiveness of a commercial top-down stereolithography (SLA)-based system for the additive manufacturing of zirconia dental prostheses. Yttria-stabilized zirconia-resin slurries were prepared, and zirconia objects were fabricated using a top-down SLA system. Thermogravimetric-differential thermal analysis was used to examine the resin, while X-ray fluorescence spectroscopy and X-ray diffraction were used to analyze the printed samples. The microstructures of additively manufactured and subtractively manufactured zirconia were compared using field emission scanning electron microscopy (FE-SEM) before and after sintering. Biaxial flexural strength tests were also conducted to evaluate mechanical properties. The green bodies obtained via additive manufacturing exhibited uniform layering with strong interlayer adhesion. After sintering, the structures were dense with minimal porosity. However, compared to subtractively manufactured zirconia, the additively manufactured specimens showed slightly higher porosity and lower biaxial flexural strength. The results demonstrate the potential of SLA-based additive manufacturing for dental zirconia applications while also highlighting its current mechanical limitations. The study also showed that using a blade to evenly spread viscous slurry layers in a top-down SLA system can effectively reduce oxygen inhibition at the surface and relieve internal stresses during the layer-by-layer printing process, offering a promising direction for clinical adaptation. address=aff1]M.Y.M. manufacturing, additive manufacturing involves building objects layer-by-layer, enabling the creation of intricate and customized complex hybrid structures with precise design specifications without the need for an expensive framework [2]. Additive manufacturing has been applied to process numerous different materials, such as resin polymers, metals, ceramics, and soft materials for bio-applications [3]. Additive manufacturing has shown significant potential for customizing dental implants and other dental tools owing to its versatility and adaptability [4]. In dentistry, dental prostheses play a major role in improving oral health and esthetics. The properties of ceramic prostheses make them desirable for dental applications. Ceramic prostheses offer several advantages in terms of esthetics, mechanical properties, biocompatibility, and cost [5]. Ceramic prostheses, such as dental crowns, bridges, and implants, are now common alternatives to metals [6]. In dentistry, the development of technologies for computer-aided design (CAD) and computer-aided manufacturing (CAM (CAD/CAM) systems, such as digital scanners and milling systems, has enabled the fabrication of ceramic prostheses [7]. High-strength ceramic prostheses, fabricated using zirconia and lithium disilicate, are often milled as pre-sintered blocks and then sintered to fabricate prostheses with excellent mechanical properties [8]. However, there are several disadvantages associated with the fabrication of zirconia-based ceramic prostheses using CAD/CAM systems that are based on subtractive manufacturing procedures, such as the generation of milling dust and limited design flexibility [9]. Recently, the additive manufacturing of ceramic prostheses for dental applications has emerged as a technique with great potential. Systems based on additive manufacturing have been developed for fabricating zirconia-based ceramic prostheses; however, they still need to overcome limitations to be accepted for clinical use. The main problem associated with additively manufactured zirconia is its low mechanical strength compared to that of conventionally manufactured zirconia using subtractive manufacturing [10]. The use of zirconia in dentistry is increasing to meet the growing demands for esthetic treatments. High-density zirconia is required for dental applications to achieve excellent mechanical properties and high translucency.