Comparative assessment of the strength of dental polymeric materials for temporary orthopedic restorations

Objective. The aim of the study Conducting a comparative analysis of the strength characteristics of model samples of modern polymer materials used for the manufacture of temporary orthopedic structures. Materials and methods. The materials used were Dental Sand Pro (HARZ Labs, Russia) and Huge PMMA Monolayer (Huge, China). Dental SAND PRO material is positioned as a ceramic-filled polymer material designed for 3D printing of temporary crowns and bridge-like structures for long-term wear. As part of the experimental part of the work, models were developed and manufactured for conducting a series of comparative compression tests. Two modern production technologies are compared: milling from ready-made factory blocks (CAD/CAM) and 3D printing. Results. Tests have shown that structures made of HUGE PMMA Monolayer material using CAD/CAM technology have higher mechanical strength compared to crowns made of HARZ Labs “Dental Sand Pro” material made by 3D printing. The destructive load of milled samples from HUGE PMMA is 2—4 times higher. Model molar crowns also had higher values for milled samples. Bridge-like prostheses made by milling could withstand about 1600 N, and 3D printing — about 500 N (p<0.05). Conclusion. Temporary structures made by milling from ready-made polymer blocks have a sufficient margin of safety for use in all areas of the dentition. In turn, 3D-printed structures, due to their lower strength characteristics, should be used mainly in the area of frontal teeth and premolars, where the load is significantly.