Iwasaki Taro, Nagata Shunsuke, Ishikawa Takahiro, Tanimoto Yasuhiro
Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo.
Department of Orthodontics, Nihon University School of Dentistry at Matsudo.
Dent Mater J. 2022 Nov 30;41(6):860-867. doi: 10.4012/dmj.2022-051. Epub 2022 Aug 5.
The objective of this study is to investigate the mechanical properties, such as the dynamic hardness and indentation elastic modulus, of commercially available aesthetic orthodontic brackets, such as ceramic and plastic brackets, by the dynamic micro-indentation method. Five ceramic brackets, which were made of alumina (both monocrystalline and polycrystalline forms) or zirconia, and two plastic brackets, which were made of glass fiber-reinforced polycarbonate or polyamide, were tested. There were significant differences in the mechanical properties of the monocrystalline and polycrystalline alumina brackets. The mechanical properties of the glass fiber-reinforced plastic bracket were significantly superior to these of the non-glass-fiber-reinforced plastic bracket. The differences in the crystal structures of the ceramic brackets surface affected the dynamic hardness and indentation elastic modulus. Furthermore, the short glass fibers contained in the plastic bracket might contribute to the improvement of the mechanical properties.
本研究的目的是通过动态微压痕法研究市售美观正畸托槽（如陶瓷和塑料托槽）的力学性能，如动态硬度和压痕弹性模量。测试了五个由氧化铝（单晶和多晶形式）或氧化锆制成的陶瓷托槽，以及两个由玻璃纤维增强聚碳酸酯或聚酰胺制成的塑料托槽。单晶和多晶氧化铝托槽的力学性能存在显著差异。玻璃纤维增强塑料托槽的力学性能明显优于非玻璃纤维增强塑料托槽。陶瓷托槽表面晶体结构的差异影响了动态硬度和压痕弹性模量。此外，塑料托槽中含有的短玻璃纤维可能有助于力学性能的提高。
