热处理和仪器的反复扭曲疲劳和机械测试
Victor Talarico Leal Vieira1, Alejandro Jaime2, Carlos Garcia Puente2
1School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, Brazil; Material Science Department. Military Institute of Engineering, Rio de Janeiro, Rio de Janeiro, Brazil; Department of Endodontics, Fluminense Federal University, Niteroi, Brazil.
Journal of endodontics
|December 26, 2024
概括
这项研究比较了四种内牙仪器的机械性能,发现了灵活性和抵抗的显著差异. 减少反转角增加了断裂时间,但不是扭矩,突出了动力学.
科学领域:
- 牙周内科医院 牙周内科医院 牙周内科医院
- 牙科材料科学 牙科材料科学
- 生物机械工程 生物机械工程
背景情况:
- 在根管准备过程中,内牙仪器经历了显著的机械应力.
- 仪器设计和动力学的变化可以影响机械性能,如灵活性和耐疲劳性.
- 了解这些特性对于选择确保程序安全性和有效性的仪器至关重要.
研究的目的:
- 评估和比较四种内牙科仪器的机械性能,特别是灵活性,抗和扭曲疲劳:互惠,互惠蓝色,一个RECI和R-Motion.
- 评估两种不同的互换角度 (150°/30°和70°/30°) 对这些仪器扭力疲劳行为的影响.
主要方法:
- 使用通用测试机器和扭矩计对160种内牙科仪器 (每品牌40种) 进行机械测试.
- 曲和曲测试是在标准化的角度和速度下进行的.
- 扭力测试是在两个互换的角度设置下 (150°/30°和70°/30°) 进行的,每分钟100转.
- 统计分析包括单向ANOVA,图基测试和学生t测试 (α = 5%).
主要成果:
- 在灵活性方面观察到显著差异 (P < .05),其中One RECI是最灵活的,Reciproc是最不灵活的.
- 反对表现出最高的屈曲阻力,而One RECI表现出最低的屈曲阻力 (P < .05).
- 互惠和互惠蓝色显示出比One RECI和R-Motion (P < .05) 更高的扭矩到断裂.
- 较小的反转角 (70°/30°) 显著增加了所有仪器的断裂时间 (P < .05),而不会影响最大扭矩到断裂 (P > .05).
结论:
- 经过测试的内牙仪表在灵活性,抗和扭曲性能方面表现出显著的差异.
- 互动动力学,特别是角度,极大地影响仪器疲劳寿命.
- 较低的互换角度通过增加破裂的时间来延长仪器操作时间,而不会损害最大扭矩容量,这表明在临床场景中优化使用.
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