## 2 Materials  
Currently, in restorative dentistry, a widely used group of materials is temporary materials. They enable prosthetic care for patients during the post-procedure period, such as tissue healing or implant osseointegration, adaptation of prosthetic restorations to the function of the masticatory system, and aesthetic acceptance by the patient. These materials can be shaped using injection moulding, milling, or manual modelling. The 3D printing method allows for the creation of complex shapes, structural homogeneity, and time and cost optimization [19; 20; 21]. There are various 3D printing methods with specific materials; however, the most commonly used is LED projector-based printing, which cures photopolymer resins. In this study, the Phrozen Sonic Mini printer (Phrozen Tech. Co., Ltd., Hsinchu City, Taiwan) with an 8K resolution was used, along with medically certified resins: NextDent C&B Bleach, NextDent Base Light Pink (NextDent B.V., Soesterberg, The Netherlands), and Harz Graphy TC-80 DP (Graphy Inc., Seoul, Republic of Korea). After printing, a post-production protocol recommended by the manufacturer was applied, which includes ultrasonic cleaning to remove uncured resin from the surface of the print, and UV curing, during which the print is dried and cured in a UV chamber to achieve its full physical properties. The creation of precise biocopies replicating complex structures with structural uniformity is made efficient and cost-effective through advanced techniques like 3D printing. After scanning a removable prosthetic restoration, it is printed and post-processed before being delivered to the patient as a temporary solution. This temporary restoration serves the patient during the necessary period for manufacturing the final restoration using definitive materials. An example of a restoration provided to the patient on the same day is shown in Figure 1.  
Digital Smile Designs (2D DSDs and 3D DSDs) can be swiftly and accurately transformed into physical models using 3D printing technology. The primary objectives during the design and fabrication of such prosthetic restorations are to improve the functionality of the masticatory system, enhance aesthetics, and assess whether the patient adapts to the new occlusal conditions [22; 23; 24]. Temporary prostheses are a key component of the prosthetic treatment process, allowing the patient to maintain chewing function and aesthetics during the transitional period. Depending on the requirements, these prostheses can be made entirely from a single material, simplifying the production process and increasing structural durability. Alternatively, they can be fabricated from different materials to achieve higher levels of aesthetics and functionality [25; 26]. Figure 2 shows a prosthesis composed of two main parts: a pink section made of NextDent Denture 3D, mimicking gum tissue, and a white section made of NextDent C&B. Bleach, replicating tooth structures. These two parts were manufactured separately and subsequently joined using an adhesive cured with UV light. The method of assembling a prosthesis from different materials, as demonstrated in the example, provides greater flexibility in tailoring the properties to the individual needs of the patient. For instance, the gingival section can be made from a more flexible material to enhance comfort, while the dental section is typically rigid and abrasion-resistant. The connection of these two elements requires precision and a suitable adhesive that ensures durability and a secure bond [27; 28; 29]. Figure 1: Biocopy of the prosthetic restoration printed the same day after the patient’s appointment. Figure 2: Prosthetic restoration—cross-section (printout of two different resins showing fit and homogeneity). During immediate implant loading procedures--commonly referred to as \"smile in a day\"--implants are placed in the patient and immediately loaded with a fixed, non-removable prosthetic restoration.