## 4 Discussion
The thickness of clear aligners varies in different teeth, such as the incisors, molars, and in the edentulous areas. 3D printing aligner manufacturing decreases the variation in thickness, leading to more predictable clear aligner treatment outcomes [4; 18]. In PET-G materials, such as Taglus Premium, the residual static force and strain recovery rate remain relatively constant even after repeated cyclic loads [4; 19], but there is a loss in the ability to exert constant force over a week of use. By applying a cyclic compression of up to 13,000 load cycles from 0 to 50 N, the estimated load to which an aligner is subjected for one week, wear, tear, high depressions, and cracks leading to a loss of force were recorded by digital image correlation and optical microscope analysis in 0.75 mm thick PET-G aligners, at higher levels than in the 0.88 mm thick sample [14; 20]. Thermodermed aligners made of the thermo-plastic material Duran showed excessive irreversible deformation during plastic deformation with load application. The displacements were between 1.5 and 2.5 mm for the Duran thermoformed aligners, and the maximum load resistance was found to be almost 200 N [13]. Duran was shown to have a low stress value of 0.5 MPa and a low percentage of normalized stress of 4.6% on a three-point bending test after 14 days of constant deflection. A great decay was also found, with the initial values of 20 MPa being followed by values ranging between 12 MPa and 4 MPa in the 24 h stress relaxation tests [3]. In the Duran materials undergoing ISO527-1 tensile testing, thermoforming caused an increase in yield stress and elastic modulus, a measurement of stiffness, whereas the storage in artificial saliva with its fluid absorption caused a decrease in these parameters due to the plasticizing effect of water [19]. In a study comparing the mechanical properties of four clear aligner materials (Taglus, Essix, Zendura, and Zendura FLX), Taglus displayed a higher elastic modulus and ultimate strength than Essix, which is also a PET-G polymer, just like Taglus. Taglus was the stiffest of the four materials, being even stiffer (8%) than Essix [21]. An in vitro study using an orthodontic simulator and measuring the buccolingual force and moments of a 0.75 mm thick thermoformed Taglus aligner for three maxillary teeth (central incisor, canine, and second premolar) showed a significantly higher mean buccal force and mean moment with a tendency to tip a tooth crown buccally in canine teeth [22]. In comparison, the elastic strain values of the Taglus system were significantly higher than those of the CA Pro+ system. Previous research has also indicated that the materials used in the Taglus aligners' composition have notable elastic properties [23]. Another study that followed the characterization by DIC confirmed that materials with higher elastic deformation respond better to compression, consistent with our results obtained for the Taglus system [17]. The PONTOS ARAMIS system is a powerful tool that significantly enhances our understanding of aligner deformation behavior. By providing precise, real-time data, it enables the development of better materials, optimized aligner designs, and personalized treatment plans. The integration of PONTOS ARAMIS with advanced computational methods like FEA further amplifies its impact, paving the way for continuous innovation in orthodontic treatment [14; 24]. As research and technology continue to evolve, the insights gained from PONTOS ARAMIS analyses will undoubtedly lead to even more effective, durable, and comfortable aligners. This progress will ensure that clear aligners remain at the forefront of orthodontic treatment, offering patients a superior alternative to traditional methods [14; 24]. The largest displacement on the Y axis is caused by the function of the articulator and the shape of the aligners. A first indication of the rigidity of the aligners can be seen as a difference between the three types of aligners, thus Spark has the largest displacement, followed by Taglus and Scheu.