Fracture Resistance of Interim Restoration Constructed by 3D Printing versus CAD/CAM Technique in Different Oral Media (In Vitro Study)

Aim: The goal of the research was to assess fracture resistance of temporary restoration materials that will be fabricated with 3D printed technique and CAD/CAM technique in different oral media (artificial saliva, tea, carbonated orange juice).Methods: According to the sample size calculation, 40-crown-shaped samples were divided into two groups (n=20); group I was manufactured by CAD/CAM, and group II was manufactured by 3D printing technology. Each group was subdivided into four subgroups (n=5). According to the immersion solution, subgroup (A) Artificial saliva, subgroup (B) Tea, subgroup (c) Carbonated orange juice, and subgroup (D) the control (non-immersion). The prepared model was scanned using an extra-oral scanner. Interim crowns were designed using 3Shape software. STL file was Produced and sent to both milling machine and printer. . All samples then were immersed in the different oral media for 7 days. Finally all samples were subjected to fracture resistance testing by using universal testing machine. The data collected, tabulated and statistically analyzed.Results: Results of the fracture resistance in control group showed higher non-statistically significant difference in cad cam technique (1262.8±580.68)than 3d printing technique(817.98±78.48) ,While after immersion in different oral media the fracture resistance samples of cad cam showed higher statistically significant different (1012.56±363.97) than in 3d printing (594.9 ± 163.1). Conclusion: The total fracture resistance of milled temporary crowns showed higher fracture resistance than 3D printing technique in different oral media with statistically significant difference.