graduate student
Moscow, Moscow, Russian Federation
employee
Moscow, Moscow, Russian Federation
employee
Moscow, Moscow, Russian Federation
UDC 616.31
This article presents a comparative study of the strength characteristics of three composite materials tested under bending loads. The objects of the study included one Russian composite material and two foreign analogues manufactured using CAD/CAM chairside technology. The relevance of the work is determined by the fact that modern dental restorations require not only high aesthetics but also significant mechanical durability, especially in clinical situations where structures are subjected to pronounced bending stresses. The tests were carried out in accordance with the requirements of the current Russian State Standards, which ensured the reproducibility of the results and the accuracy of the subsequent analysis. The aim of the study was to determine the flexural strength, elastic modulus, fracture behavior, and to perform a comprehensive assessment of the effectiveness of each material under conditions approximating functional loads in the oral cavity. As part of the experiment, three-point bending tests were performed. For all specimens, the flexural strength values, magnitudes of elastic and plastic deformation, and characteristic features of crack formation were recorded. Based on the obtained data, a detailed comparison of the performance characteristics of the investigated composite blocks was conducted, including their resistance to mechanical loading, structural stability, and ability to maintain integrity under prolonged stress. The results of the study made it possible to draw conclusions regarding the suitability of each examined material for dental restorations fabricated using the CAD/CAM method. Both the advantages and the limiting factors of the Russian and foreign materials were identified, enabling clinicians to make more informed decisions when selecting materials depending on the specific clinical situation.
composite materials, bending strength, modulus of elasticity, CAD/CAM chairside, three-point bending, mechanical testing, Russian and foreign composites, strength characteristics
1. Fasbinder D.J. Chairside CAD/CAM restorative dentistry: a review of the state of the art. Compendium of Continuing Education in Dentistry. 2012;33(1):50-8.
2. Miyazaki T., Hotta Y., Kunii J., Kuriyama S., Tamaki Y. A review of dental CAD/CAM: current status and future perspectives from 20 years of experience. Dental Materials Journal. 2009;28(1):44-56. https://doi.org/10.4012/dmj.28.44
3. Giordano R. Materials for chairside CAD/CAM–produced restorations. The Journal of the American Dental Association. 2006;137(Suppl):14S-21S. https://doi.org/10.14219/jada.archive.2006.0397
4. GOST 31574–2012. Materialy stomatologicheskie. Materialy dlya restavraciy zubov. Obschie tehnicheskie usloviya. Moskva: Standartinform; 2013. 47 s. [GOST 31574–2012. Dental materials. Materials for dental restorations. General technical conditions. Moscow: Standartinform; 2013.47 p. (In Russ.)]. gost_31574-2012.pdf
5. Mel'nik A.S., Goryainova K.E., Lebedenko I.Yu. Obzor sovremennyh materialov dlya izgotovleniya keramicheskih koronok u kresla pacienta metodom komp'yuternogo frezerovaniya. Rossiyskiy stomatologicheskiy zhurnal. 2014;18(6):24-28. [Melnik A.S., Goryainova K.E., Lebedenko I.Y. Review modern materials for the manufacturing ceramic crowns at the chairside by the method of computer milling. Russian Journal of Dentistry. 2014;18(6):24-28. (In Russ.)]. https://doi.org/10.17816/dent.39270
6. Nenasheva E.A., Bykova M.V., Deev M.S., Bykov D.O. Izuchenie prochnosti na izgib obrazcov mnogosloynoy stomatologicheskoy keramiki na osnove dioksida cirkoniya otechestvennogo i kitayskogo proizvodstva posle tradicionnogo i skorostnogo spekaniya. Problemy stomatologii. 2024;20(2):191-195. [Nenasheva E.A., Bykova M.V., Deev M.S., Bykov D.O. Studying the flexural strength of samples of multilayer dental ceramics based on zirconium dioxide of domestic and chinese production after traditional and high-speed sintering. Actual problems in dentistry. 2024;20(2):191-195. (In Russ.)]. https://elibrary.ru/item.asp?id=68568653
7. Goryaynova K.E., Rusanov F.S., Poyurovskaya I.Ya., Retinskaya M.V., Lebedenko I.Yu. Sravnitel'naya ocenka prochnosti stomatologicheskih materialov dlya metodiki cad/cam u kresla pacienta. Rossiyskiy stomatologicheskiy zhurnal. 2016;20(3):116-120. [Goryainova K.E., Rusanov F.S., Poyurovskaya I.Ya., Retinskaya M.V., Lebedenko I.Yu. Comparative assessment of strength of dental cad/cam materials for chairside techniques. Russian Journal of Dentistry. 2016;20(3):116-120. (In Russ.)]. https://elibrary.ru/item.asp?id=26331214
