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Effects of aging on the mechanical properties of Graphy® orthodontic aligners: In vitro study
Pauline Ursat1, Éric Ursat1, Thibault Canceill2
1Faculté d’Odontologie, Département d’Orthopédie dento-faciale, Université de Lorraine, Nancy, France
Introduction:
The objective of this experimental study is to analyze the effect of artificial saliva on the mechanical properties of the Tera Harz TC-85 material (Graphy®) at different time intervals: day 0, day 7, and day 14, in order to observe over time the force delivered and the deformation of the direct-printed 3D aligners.
Materials And Method:
18 identical, Class I without DMD, Graphy® aligners were included in three groups (D0 unaged, D7, and D14) to undergo a continuous aging procedure in Fusayama/Meyer artificial saliva in a water bath at 37°C to reproduce the conditions of the oral cavity, before being placed on the traction bench with traction tests at D0, D7, and D14.
Results:
Deformation at D0 differed significantly (p < 0.001) from deformation at D7 and D14 in the incisors and molars.
Conclusion:
The stability of the mechanical properties of the Tera Harz TC-85 material (Graphy®) for direct 3D printing of aligners suggests that a weekly aligner replacement may be considered.
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