Continuous development in digital technologies have revolutionized dental care, offered novel solutions for diagnosis and treatment with subsequent improved patient satisfaction [1]. The utilization of intraoral scanners (IOSs) and computer aided design and computer aided manufacturing (CAD/CAM) improved dental workflow providing definitive chairside restorations with improved accuracy, efficiency and reproducibility [2]. CAD/CAM manufacturing involves both milling and 3D-printing technologies [3]. Digital fabrication of laminate veneers provides a modern restorative solution to enhance esthetics in patients with defective anterior teeth [4]. The limitation posed by manual skill of the practitioner is eliminated [5]. Achieving life-like esthetics remains a significant challenge, particularly in replicating the natural multichromatic properties of human teeth [[6], [7], [8]].

Until recently, manufacture of multichromatic CAD/CAM restorations was limited to milling, where the use of milling burs might jeopardize the integrity of the thin restorative margins [9].

Recent developments in 3D printers and biomaterials introduced chairside Tilted Stereolithography (TSLA) printers. The technology allows the 3D-printing of both monochromatic and multichromatic restorations thus providing a definitive restorative solution. For printing a monochromatic restoration, the material is supplied in single shade cartridges (A1, A2, A3, A3.5), whereas for printing a multi-chromatic restoration, highly filled resin cartridges are available with different shades ranging from A1-A3.5 [10]. The printability of highly viscous resin is facilitated in TSLA technique by tilting both build platform and material cartridge 45 degrees to the horizontal plane utilizing peristaltic pump to control the flow of the material during the printing process [10]. Revilla-León, et al. [11] showed that the print orientation significantly influences the trueness and precision of resin ceramic full coverage posterior crowns [11]. Mangano et al. [12] revealed that full coverage restorations additively manufactured by chairside TSLA technique provides efficiency, high precision and marginal trueness at a low production cost [12]. In another study, Mangano et al. [13] showed that implant supported single and 3-unit fixed partial denture (FPD) had 95.8 % success rate [13]. Demirel et al. [14] showed that the trueness, fit and marginal quality of printed veneers are influenced by the manufacturing parameters and restoration thickness [14].

A recent study by Alharbi and Osman [15] evaluated the effect of material shade and build direction on the trueness of TSLA printed veneers and found that the trueness of the printed veneers is significantly influenced by both factors [15]. Clinical cases necessitate various veneer preparation designs depending on the amount of tissue loss and esthetics needed. Osman & Alharbi 2025 [16], evaluated the influence of preparation design and build orientation on the accuracy of monochromatic ceramic-filled composite veneers printed using TSLA technique. The results revealed that both preparation design and build orientation influence the accuracy of the printed veneers [16]. No previous studies evaluated the influence of different preparation designs and build angles when printing multichromatic hybrid ceramic resin veneers. Therefore, the aim of the present study was to evaluate the influence of preparation design and build angle on the accuracy of multichromatic ceramic filled composite TSLA-printed veneers. The null hypothesis was that both build angle and preparation design have no influence on the accuracy of the multichromatic ceramic filled hybrid composite TSLA-printed veneers.