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Mechanical properties of thermoformed and 3D-printed aligners after cleansing solution exposure: An in vitro study
Diksha Vinod Wali1, Shashank Sharad Gaikwad1, Vilasrao Kadam2
1Department of Orthodontics and Dentofacial Orthopedics, Bharati Vidyapeeth (Deemed to be) University Dental College and Hospital, Navi Mumbai, Maharashtra, India.
Abstract:
The impact of common cleaning solutions on the mechanical properties of clear orthodontic aligners made from PET-G, polyurethane and resin-based materials is of interest. Nanoindentation tests measured elastic modulus, hardness, elastic index and load relaxation after exposure to Retainer Brite®, Fresh Guard® and artificial saliva. The results showed that peroxide-based cleaners significantly degrade aligner properties, while Fresh Guard® causes moderate changes and artificial saliva has minimal effects. Resin-based aligners showed superior chemical stability, making them more resistant to cleaning agents. Thus, mild cleaners are recommended for maintaining aligner performance.
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