在常规与合同内牙腔腔中的文件断裂与合同内牙腔
Donald K Mauney Iii1, Antheunis Versluis2, Daranee Tantbirojn3
1Department of Endodontics, University of Tennessee Health Science Center, College of Dentistry, Tennessee, USA.
European endodontic journal
|January 14, 2024
概括
与常规接入相比,收缩的内牙接入腔导致- (Ni-Ti) 旋转仪器的早期故障和较长的分离尖端长度. 这是由于Ni-Ti文件中的压力增加.
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
- 生物材料工程 生物材料工程
背景情况:
- - (Ni-Ti) 旋转仪器在内牙科手术中被广泛使用.
- 牙周接入腔的设计可以影响仪器的性能和寿命.
- 在不同的访问条件下了解Ni-Ti文件的生物力学行为对于临床成功至关重要.
研究的目的:
- 为了比较Ni-Ti旋转仪器的循环疲劳阻力和尖端分离长度.
- 评估传统与合同内牙接入腔对仪器故障的影响.
- 通过有限元分析分析Ni-Ti仪器内的应力分布.
主要方法:
- 模拟下牙的口腔沟道用传统的或合同的内牙接入腔室准备.
- 在控制扭矩 (1.8Nm) 和转速 (500RPM) 的情况下,用于模拟仪表的Ni-Ti旋转文件 (30/.04).
- 旋转到故障,尖端分离长度和仪器应力被记录并进行统计分析.
主要成果:
- 与传统访问 (599±126) 相比,合同访问导致故障轮换 (465±65) 显著减少.
- 在合同访问组 (4.90±1.02毫米) 与常规组 (3.99±0.29毫米) 相比,尖端分离长度显著更长.
- 有限元分析表明文件曲率和应力水平更高,特别是在中段,有合同访问.
结论:
- 收缩的内牙接入腔增加了Ni-Ti旋转仪器的压力,导致更早的循环疲劳失败.
- 经合同访问时观察到的更长的尖端分离长度会带来更大的程序并发症风险.
- 牙医应该考虑通道腔设计对Ni-Ti仪器性能和患者安全的潜在影响.
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