ASPECTS CONCERNING THE MECHANICAL RESISTANCE OF THE ALIGNER MATERIALS

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Cristina (Cîșlariu) Vasilache, Ciprian-Ionuț Morăraș, Viorel Goanță, Georgeta Zegan, Georgiana Macovei, Maria-Antonela Beldiman

ABSTRACT

Aim of the study The most commonly materials in aligners technology are polyurethane and glycol-modified PET, but the thermoplastic polyurethanes (TPU) are used by the most famous brands of aligner production – although, the properties of materials used for their fabrication remain one of the most essential aspects in determining their mechanical and clinical features. Materials and methods The objective of this study is to determine the tensile strength and elasticity of different types of materials used in the manufacture of aligners with a performant mechanical testing system, with a specific software, on eleven samples made from different materials and different thickness, with special marks, in order to determine the mechanical resistance and elasticity until the breaking moment. Data were registered and the software elaborated the parameters and the curves for specific stress-strain, and the variations of stress in relation to the longitudinal and transversal specific deformation. Conclusions There is noticed the fact that, when the stress reaches a value of approx. 20 MPa and the longitudinal specific deformation of approx. 1%, is observed a curvature of the variation graph, signifying the transition to the plastic range of the material, and the breaking moment occurs at stress values of approximately 45 MPa, longitudinal specific deformation of 3% which shows the brittle nature of the material.

DOI : 10.62610/RJOR.2025.1.17.11