###### Abstract  
This in vitro study aims to investigate the fracture properties of 3D-printed resin provisional material designed with different connector dimensions for two-unit fixed dental prostheses (FDPs). The master model was digitally designed following Shillingburg's all-ceramic restoration tooth preparation guidelines and milled from aluminum. Four two-unit FDPs with different connector dimensions were designed: 2 \(\times\) 3 mm, 3 \(\times\) 3 mm, 3 \(\times\) 4 mm, and 4 \(\times\) 4 mm (width \(\times\) length) (Groups A, B, C, and D, respectively; n = 10 for each group). These specimens were printed using 3D-printed resin material (Detax FREEPRINT(r) temp). Forty specimens were subjected to a three-point test using a universal testing machine until fracture. The failure mode was examined under a stereomicroscope. The Kruskal-Wallis test at \(\alpha\) = 0.05 revealed non-significant differences in fracture resistance load but significantly different elastic modulus, yield strength, and compressive strength (\(p\) = 0.061, \(p\) < 0.001, \(p\) < 0.001, and \(p\) < 0.001, respectively) among the different groups. The 2 \(\times\) 3 mm connectors had higher means of modulus, yield strength, and compressive strength compared to the other groups. The study found that the maximum load causing fractures in 3D-printed provisional material connectors was consistent, regardless of connector cross-section variations. The 2 \(\times\) 3 mm group performed best, while the 4 \(\times\) 4 mm group performed worst. fixed dental prosthesis; 3D-printed resin; connector dimensions; fracture properties 2020 2020 2025 25 June 2025  
has high aesthetic characteristics and good mechanical properties. This is in addition to more biocompatibility than metal fused to the porcelain prosthesis [4]. Although dental implants have a higher success rate than FDPs, there are still some limitations to placing them for all patients [5]. Additionally, dental implant treatment has some contraindications, such as periodontal disease, poor oral hygiene, heavy smoking, parafunctional habits like bruxism, and certain systemic diseases that affect the periodononium, bleeding control, or healing after surgical procedures [6]. Therefore, FDPs remain a valid and reliable treatment option in prosthodontics. FDP abutments should be protected between dental visits using provisional FDPs [3]. A dental provisional prosthesis is used to improve the current condition of the oral cavity. It is a dental interim prosthesis used for a limited period before a permanent dental prosthesis is replaced [2]. A dental provisional prosthesis is designed to enhance esthetics, provide stabilization, and facilitate function [2]. It aids in avoiding gingival growth or inflammation of the periodontium and eliminates the need to remake the definitive impression [3]. Provisional FDPs could be fabricated using different provisional materials [7; 8]. Polymethyl methacrylate (PMMA) is one of these materials that is widely used in dental applications [8]. These materials could be manufactured conventionally as cold-cured or heat-cured PMMA materials. In addition, these provisional FDPs could be manufactured digitally using subtractive or additive manufacturing technology [7; 8]. Subtractive technology is defined as the machining process to remove material from a material block [2]. 3D-printing technology, which is known as additive manufacturing technology, is a general term for a manufacturing approach that transfers an object from liquid to solid structure by curing layer over layer until it reaches the final 3D structure [9; 10]. These objects were designed primarily with specific designing software. Then, this 3D design is manufactured from varying resin materials using a 3D printer machine [9; 11].