Marsh, Spencer, Ravikumar Anthony, Blair Barnett, Chen Shou, and Kristin Saunders. “Comparison Between the in-Vitro Cytotoxicity of Three Different Multilayer Thermoplastic Clear Aligner Materials”. International Journal of Dental Materials 4, no. 1 (February 6, 2022): 1–5. Accessed July 27, 2025. https://ijdm.co.in/index.php/dental-materials/article/view/74.