title: Preparation and characterization of thermoplastic materials for invisible orthodontics.
abstract: PETG/PC/TPU polymer blend was prepared by mechanical blending. The mechanical properties of modified PETG/PC/TPU blend were characterized using a universal testing machine, and results were compared against two commercial thermoplastic products -Erkodur and Biolon. Blending modification improved the properties of PETG/PC/TPU. When blending ratio (wt%) was 70/10/20, PETG/PC/TPU exhibited optimal mechanical properties which exceeded those of Erkodur and Biolon. Tear strength was 50.23 MPa and elongation at break was 155.99%. Stress relaxation rate was 0.0136 N/s after 1 hour, which was significantly slower than Erkodur and Biolon (p<0.05). Water absorption rate was 0.57% after 2 weeks, which was significantly lower than Erkodur and Biolon (p<0.05).
authors: Department of Orthodontics, School of Stomatology, Capital Medical University.
authors: Ning
authors: N
authors: Zhang
authors: Yuxing
authors: Y
authors: Bai
authors: Xuejia
authors: X
authors: Ding
authors: Yu
authors: Y
authors: Zhang
mesh_terms: D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000379:methods*; D006801:Humans; D008422:Materials Testing; D018704:Orthodontic Retainers; D009970:Orthodontics / Q000379:methods; D011076:Polycarboxylate Cement / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D011093:Polyethylene Terephthalates / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry*
chemical_list: D003764:Dental Materials; D011076:Polycarboxylate Cement; D011093:Polyethylene Terephthalates; D011140:Polyurethanes; C475920:polyethylene terephthalate glycol; C005506:polycarbonate; D011092:Polyethylene Glycols