투명 장치의 열가소성 재료의올바른 이해
Physical properties of thermoplastic material for clear aligners
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초록
Recent technological advance have greatly expanded the application of invisible orthodontic treatment using clear thermoplastic materials. However, the final outcomes using clear aligner system do not achieve the level of final goal frequently, which results in case refinement, midcourse correction, or fixed orthodontic treatment. Therefore, mechanical properties of thermoplastic materials should be considered to improve the quality of outcomes. The purposes of this special article were to evaluate the force and stress depending on the materials, deflection and thickness of thermoplastic materials and to evaluate the mechanical properties of thermoplastic materials after repeated loading. Thickness and amount of deflection rather than products and materials showed the largest effect on force and stress. In all products, at least 159 gf of force was required for more than 1.0 mm deflection or when materials with 1.0 mm thickness were deflected. Orthodontic forces delivered by thermoplastic materials depend on the materials, thickness, amount of activation, and intra-oral condition. Proper thickness of thermoplastic materials and deflection level of tooth movement should be decided for the efficient and physiologic tooth movement.
Abstract
Recent technological advance have greatly expanded the application of invisible orthodontic treatment using clear thermoplastic materials. However, the final outcomes using clear aligner system do not achieve the level of final goal frequently, which results in case refinement, midcourse correction, or fixed orthodontic treatment. Therefore, mechanical properties of thermoplastic materials should be considered to improve the quality of outcomes. The purposes of this special article were to evaluate the force and stress depending on the materials, deflection and thickness of thermoplastic materials and to evaluate the mechanical properties of thermoplastic materials after repeated loading. Thickness and amount of deflection rather than products and materials showed the largest effect on force and stress. In all products, at least 159 gf of force was required for more than 1.0 mm deflection or when materials with 1.0 mm thickness were deflected. Orthodontic forces delivered by thermoplastic materials depend on the materials, thickness, amount of activation, and intra-oral condition. Proper thickness of thermoplastic materials and deflection level of tooth movement should be decided for the efficient and physiologic tooth movement.
참고문헌 (6)
- Simon, M., "Treatment outcome and efficacy of an aligner technique--regarding incisor torque, premolar derotation and molar distalization", BMC Oral Health, 14, pp.68~ (2014)
- Ryokawa, H., "The mechanical properties of dental thermoplastic materials in a simulated intraoral environment", Orthodontic Waves, 65, pp.64~72 (2006)
- 차정열, "교정용 열가소성 재료의 두께와 변형량이 재료의 물리적 특성에 미치는 영향", 대한치과교정학회지, 40(1), pp.16~26 (2010), 대한치과교정학회
- Xiaowei Li, "Changes in force associated with the amount of aligner activation and lingual bodily movement of the maxillary central incisor", 대한치과교정학회지, 46(2), pp.65~72 (2016), 대한치과교정학회
- Fang, D., "Dynamic stress relaxation of orthodontic thermoplastic materials in a simulated oral environment", Dent Mater J, 32, pp.946~951 (2013)
- Kohda, N., "Effects of mechanical properties of thermoplastic materials on the initial force of thermoplastic appliances", The Angle orthodontist, 83, pp.476~483 (2013)