Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
류정현, 권재성, Jiang Heng Bo, 차정열, 김광만,
소속 상세정보
류정현 ( Ryu Jeong-Hyun ) - Yonsei University College of Dentistry Department and Research Institute of Dental Biomaterials and Bioengineering
권재성 ( Kwon Jae-Sung ) - Yonsei University College of Dentistry Department and Research Institute of Dental Biomaterials and Bioengineering
( Jiang Heng Bo ) - Taishan Medical University School of Stomatology
차정열 ( Cha Jung-Yul ) - Yonsei University College of Dentistry Department of Orthodontics
김광만 ( Kim Kwang-Mahn ) - Yonsei University College of Dentistry Department and Research Institute of Dental Biomaterials and Bioengineering
Abstract
Objective: The aim of this systematic multiscale analysis was to evaluate the effects of thermoforming on the physical and mechanical properties of thermoplastic materials used to fabricate transparent orthodontic aligners (TOAs).
Methods: Specimens were fabricated using four types of thermoplastic materials with different thicknesses under a thermal vacuum. Transparency, water absorption and solubility, surface hardness, and the results of three-point bending and tensile tests were evaluated before and after thermoforming. Data were analyzed using one-way analysis of variance and Student’s t-test.
Results: After thermoforming, the transparency of Duran and Essix A+ decreased, while the water absorption ability of all materials; the water solubility of Duran, Essix A+, and Essix ACE; and the surface hardness of Duran and Essix A+ increased. The flexure modulus for the 0.5-mm-thick Duran, Essix A+, and eCligner specimens increased, whereas that for the 0.75-/1.0-mm-thick Duran and eClginer specimens decreased. In addition, the elastic modulus increased for the 0.5-mm-thick Essix A+ specimens and decreased for the 0.75-mm-thick Duran and Essix ACE and the 1.0-mm-thick Essix ACE specimens.
Conclusions: Our findings suggest that the physical and mechanical properties of thermoplastic materials used for the fabrication of TOAs should be evaluated after thermoforming in order to characterize their properties for clinical application.
키워드
Thermoplastic materials; Physical properties; Mechanical properties; Aligner
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